shard-crystal-db/api/0.13.1/index.json

{"repository_name":"db","body":"[![Build Status](https://github.com/crystal-lang/crystal-db/workflows/CI/badge.svg)](https://github.com/crystal-lang/crystal-db/actions?query=workflow%3ACI+event%3Apush+branch%3Amaster)\n\n# crystal-db\n\nCommon db api for crystal. You will need to have a specific driver to access a database.\n\n* [SQLite](https://github.com/crystal-lang/crystal-sqlite3)\n* [MySQL](https://github.com/crystal-lang/crystal-mysql)\n* [PostgreSQL](https://github.com/will/crystal-pg)\n* [ODBC](https://github.com/naqvis/crystal-odbc)\n* [Cassandra](https://github.com/kaukas/crystal-cassandra)\n* [DuckDB](https://github.com/amauryt/crystal-duckdb)\n* [Microsoft SQL Server](https://github.com/wonderix/crystal-tds)\n\n## Installation\n\nIf you are creating a shard that will work with _any_ driver, then add `crystal-db` as a dependency in `shard.yml`:\n\n```yaml\ndependencies:\n  db:\n    github: crystal-lang/crystal-db\n```\n\nIf you are creating an application that will work with _some specific_ driver(s), then add them in `shard.yml`:\n\n```yaml\ndependencies:\n  sqlite3:\n    github: crystal-lang/crystal-sqlite3\n```\n\n`crystal-db` itself will be a nested dependency if drivers are included.\n\nNote: Multiple drivers can be included in the same application.\n\n## Documentation\n\n* [Latest API](https://crystal-lang.github.io/crystal-db/api/latest/)\n* [Crystal book](https://crystal-lang.org/docs/database/)\n\n## Usage\n\nThis shard only provides an abstract database API. In order to use it, a specific driver for the intended database has to be required as well:\n\nThe following example uses SQLite where `?` indicates the arguments. If PostgreSQL is used `$1`, `$2`, etc. should be used. `crystal-db` does not interpret the statements.\n\n```crystal\nrequire \"db\"\nrequire \"sqlite3\"\n\nDB.open \"sqlite3:./file.db\" do |db|\n  # When using the pg driver, use $1, $2, etc. instead of ?\n  db.exec \"create table contacts (name text, age integer)\"\n  db.exec \"insert into contacts values (?, ?)\", \"John Doe\", 30\n\n  args = [] of DB::Any\n  args << \"Sarah\"\n  args << 33\n  db.exec \"insert into contacts values (?, ?)\", args: args\n\n  puts \"max age:\"\n  puts db.scalar \"select max(age) from contacts\" # => 33\n\n  puts \"contacts:\"\n  db.query \"select name, age from contacts order by age desc\" do |rs|\n    puts \"#{rs.column_name(0)} (#{rs.column_name(1)})\"\n    # => name (age)\n    rs.each do\n      puts \"#{rs.read(String)} (#{rs.read(Int32)})\"\n      # => Sarah (33)\n      # => John Doe (30)\n    end\n  end\nend\n```\n\n## Roadmap\n\nIssues not yet addressed:\n\n- [x] Support non prepared statements. [#25](https://github.com/crystal-lang/crystal-db/pull/25)\n- [x] Time data type. (implementation details depends on actual drivers)\n- [x] Data type extensibility. Allow each driver to extend the data types allowed.\n- [x] Transactions & nested transactions. [#27](https://github.com/crystal-lang/crystal-db/pull/27)\n- [x] Connection pool.\n- [x] Logging\n- [ ] Direct access to `IO` to avoid memory allocation for blobs.\n\n## Contributing\n\n1. Fork it ( https://github.com/crystal-lang/crystal-db/fork )\n2. Create your feature branch (git checkout -b my-new-feature)\n3. Commit your changes (git commit -am 'Add some feature')\n4. Push to the branch (git push origin my-new-feature)\n5. Create a new Pull Request\n\n## Contributors\n\n- [bcardiff](https://github.com/bcardiff) Brian J. Cardiff - creator, maintainer\n","program":{"html_id":"db/toplevel","path":"toplevel.html","kind":"module","full_name":"Top Level Namespace","name":"Top Level Namespace","abstract":false,"ancestors":[{"html_id":"db/Spec/Methods","kind":"module","full_name":"Spec::Methods","name":"Methods"},{"html_id":"db/Spec/Expectations","kind":"module","full_name":"Spec::Expectations","name":"Expectations"}],"locations":[],"repository_name":"db","program":true,"enum":false,"alias":false,"const":false,"included_modules":[{"html_id":"db/Spec/Expectations","kind":"module","full_name":"Spec::Expectations","name":"Expectations"},{"html_id":"db/Spec/Methods","kind":"module","full_name":"Spec::Methods","name":"Methods"}],"extended_modules":[{"html_id":"db/Spec/Expectations","kind":"module","full_name":"Spec::Expectations","name":"Expectations"},{"html_id":"db/Spec/Methods","kind":"module","full_name":"Spec::Methods","name":"Methods"}],"types":[{"html_id":"db/DB","path":"DB.html","kind":"module","full_name":"DB","name":"DB","abstract":false,"locations":[{"filename":"src/db.cr","line_number":82,"url":"https://github.com/crystal-lang/crystal-db/blob/v0.13.1/src/db.cr#L82"},{"filename":"src/db/begin_transaction.cr","line_number":1,"url":"https://github.com/crystal-lang/crystal-db/blob/v0.13.1/src/db/begin_transaction.cr#L1"},{"filename":"src/db/connection.cr","line_number":1,"url":"https://github.com/crystal-lang/crystal-db/blob/v0.13.1/src/db/connection.cr#L1"},{"filename":"src/db/connection_builder.cr","line_number":1,"url":"https://github.com/crystal-lang/crystal-db/blob/v0.13.1/src/db/connection_builder.cr#L1"},{"filename":"src/db/connection_context.cr","line_number":1,"url":"https://github.com/crystal-lang/crystal-db/blob/v0.13.1/src/db/connection_context.cr#L1"},{"filename":"src/db/database.cr","line_number":4,"url":"https://github.com/crystal-lang/crystal-db/blob/v0.13.1/src/db/database.cr#L4"},{"filename":"src/db/disposable.cr","line_number":1,"url":"https://github.com/crystal-lang/crystal-db/blob/v0.13.1/src/db/disposable.cr#L1"},{"filename":"src/db/driver.cr","line_number":1,"url":"https://github.com/crystal-lang/crystal-db/blob/v0.13.1/src/db/driver.cr#L1"},{"filename":"src/db/enumerable_concat.cr","line_number":1,"url":"https://github.com/crystal-lang/crystal-db/blob/v0.13.1/src/db/enumerable_concat.cr#L1"},{"filename":"src/db/error.cr","line_number":1,"url":"https://github.com/crystal-lang/crystal-db/blob/v0.13.1/src/db/error.cr#L1"},{"filename":"src/db/mapping.cr","line_number":1,"url":"https://github.com/crystal-lang/crystal-db/blob/v0.13.1/src/db/mapping.cr#L1"},{"filename":"src/db/pool.cr","line_number":5,"url":"https://github.com/crystal-lang/crystal-db/blob/v0.13.1/src/db/pool.cr#L5"},{"filename":"src/db/pool_prepared_statement.cr","line_number":1,"url":"https://github.com/crystal-lang/crystal-db/blob/v0.13.1/src/db/pool_prepared_statement.cr#L1"},{"filename":"src/db/pool_statement.cr","line_number":1,"url":"https://github.com/crystal-lang/crystal-db/blob/v0.13.1/src/db/pool_statement.cr#L1"},{"filename":"src/db/pool_unprepared_statement.cr","line_number":1,"url":"https://github.com/crystal-lang/crystal-db/blob/v0.13.1/src/db/pool_unprepared_statement.cr#L1"},{"filename":"src/db/query_methods.cr","line_number":1,"url":"https://github.com/crystal-lang/crystal-db/blob/v0.13.1/src/db/query_methods.cr#L1"},{"filename":"src/db/result_set.cr","line_number":1,"url":"https://github.com/crystal-lang/crystal-db/blob/v0.13.1/src/db/result_set.cr#L1"},{"filename":"src/db/serializable.cr","line_number":1,"url":"https://github.com/crystal-lang/crystal-db/blob/v0.13.1/src/db/serializable.cr#L1"},{"filename":"src/db/session_methods.cr","line_number":1,"url":"https://github.com/crystal-lang/crystal-db/blob/v0.13.1/src/db/session_methods.cr#L1"},{"filename":"src/db/statement.cr","line_number":1,"url":"https://github.com/crystal-lang/crystal-db/blob/v0.13.1/src/db/statement.cr#L1"},{"filename":"src/db/string_key_cache.cr","line_number":1,"url":"https://github.com/crystal-lang/crystal-db/blob/v0.13.1/src/db/string_key_cache.cr#L1"},{"filename":"src/db/transaction.cr","line_number":1,"url":"https://github.com/crystal-lang/crystal-db/blob/v0.13.1/src/db/transaction.cr#L1"},{"filename":"src/db/version.cr","line_number":1,"url":"https://github.com/crystal-lang/crystal-db/blob/v0.13.1/src/db/version.cr#L1"},{"filename":"src/spec.cr","line_number":9,"url":"https://github.com/crystal-lang/crystal-db/blob/v0.13.1/src/spec.cr#L9"}],"repository_name":"db","program":false,"enum":false,"alias":false,"const":false,"constants":[{"id":"Log","name":"Log","value":"::Log.for(self)"},{"id":"TYPES","name":"TYPES","value":"[Nil, String, Bool, Int32, Int64, Float32, Float64, Time, Bytes]","doc":"Types supported to interface with database driver.\nThese can be used in any `ResultSet#read` or any `Database#query` related\nmethod to be used as query parameters","summary":"<p>Types supported to interface with database driver.</p>"},{"id":"VERSION","name":"VERSION","value":"\"0.13.1\""}],"doc":"The DB module is a unified interface for database access.\nIndividual database systems are supported by specific database driver shards.\n\nAvailable drivers include:\n* [crystal-lang/crystal-sqlite3](https://github.com/crystal-lang/crystal-sqlite3) for SQLite\n* [crystal-lang/crystal-mysql](https://github.com/crystal-lang/crystal-mysql) for MySQL and MariaDB\n* [will/crystal-pg](https://github.com/will/crystal-pg) for PostgreSQL\n* [kaukas/crystal-cassandra](https://github.com/kaukas/crystal-cassandra) for Cassandra\n\nFor basic instructions on implementing a new database driver, check `Driver` and the existing drivers.\n\nDB manages a connection pool. The connection pool can be configured by query parameters to the\nconnection `URI` as described in `Database`.\n\n### Usage\n\nAssuming `crystal-sqlite3` is included a SQLite3 database can be opened with `#open`.\n\n```\ndb = DB.open \"sqlite3:./path/to/db/file.db\"\ndb.close\n```\n\nIf a block is given to `#open` the database is closed automatically\n\n```\nDB.open \"sqlite3:./file.db\" do |db|\n  # work with db\nend # db is closed\n```\n\nIn the code above `db` is a `Database`. Methods available for querying it are described in `QueryMethods`.\n\nThree kind of statements can be performed:\n1. `Database#exec` waits no response from the database.\n2. `Database#scalar` reads a single value of the response.\n3. `Database#query` returns a ResultSet that allows iteration over the rows in the response and column information.\n\nAll of the above methods allows parametrised query. Either positional or named arguments.\n\nCheck a full working version:\n\nThe following example uses SQLite where `?` indicates the arguments. If PostgreSQL is used `$1`, `$2`, etc. should be used. `crystal-db` does not interpret the statements.\n\n```\nrequire \"db\"\nrequire \"sqlite3\"\n\nDB.open \"sqlite3:./file.db\" do |db|\n  # When using the pg driver, use $1, $2, etc. instead of ?\n  db.exec \"create table contacts (name text, age integer)\"\n  db.exec \"insert into contacts values (?, ?)\", \"John Doe\", 30\n\n  args = [] of DB::Any\n  args << \"Sarah\"\n  args << 33\n  db.exec \"insert into contacts values (?, ?)\", args: args\n\n  puts \"max age:\"\n  puts db.scalar \"select max(age) from contacts\" # => 33\n\n  puts \"contacts:\"\n  db.query \"select name, age from contacts order by age desc\" do |rs|\n    puts \"#{rs.column_name(0)} (#{rs.column_name(1)})\"\n    # => name (age)\n    rs.each do\n      puts \"#{rs.read(String)} (#{rs.read(Int32)})\"\n      # => Sarah (33)\n      # => John Doe (30)\n    end\n  end\nend\n```\n\n### Object mapping\n\nThe `DB::Serializable` module implements a declarative mapping from DB result\nsets to Crystal types.","summary":"<p>The DB module is a unified interface for database access.</p>","class_methods":[{"html_id":"connect(uri:URI|String)-class-method","name":"connect","doc":"Opens a connection using the specified *uri*.\nThe scheme of the *uri* determines the driver to use.\nReturned connection must be closed by `Connection#close`.\nIf a block is used the connection is yielded and closed automatically.","summary":"<p>Opens a connection using the specified <em>uri</em>.</p>","abstract":false,"args":[{"name":"uri","external_name":"uri","restriction":"URI | String"}],"args_string":"(uri : URI | String)","args_html":"(uri : URI | String)","location":{"filename":"src/db.cr","line_number":140,"url":"https://github.com/crystal-lang/crystal-db/blob/v0.13.1/src/db.cr#L140"},"def":{"name":"connect","args":[{"name":"uri","external_name":"uri","restriction":"URI | String"}],"visibility":"Public","body":"build_connection(uri)"}},{"html_id":"connect(uri:URI|String,&)-class-method","name":"connect","doc":"Opens a connection using the specified *uri*.\nThe scheme of the *uri* determines the driver to use.\nReturned connection must be closed by `Connection#close`.\nIf a block is used the connection is yielded and closed automatically.","summary":"<p>Opens a connection using the specified <em>uri</em>.</p>","abstract":false,"args":[{"name":"uri","external_name":"uri","restriction":"URI | String"}],"args_string":"(uri : URI | String, &)","args_html":"(uri : URI | String, &)","location":{"filename":"src/db.cr","line_number":145,"url":"https://github.com/crystal-lang/crystal-db/blob/v0.13.1/src/db.cr#L145"},"def":{"name":"connect","args":[{"name":"uri","external_name":"uri","restriction":"URI | String"}],"yields":1,"block_arity":1,"visibility":"Public","body":"cnn = build_connection(uri)\nbegin\n  yield cnn\nensure\n  cnn.close\nend\n"}},{"html_id":"open(uri:URI|String)-class-method","name":"open","doc":"Creates a `Database` pool and opens initial connection(s) as specified in the connection *uri*.\nUse `DB#connect` to open a single connection.\n\nThe scheme of the *uri* determines the driver to use.\nConnection parameters such as hostname, user, database name, etc. are specified according\nto each database driver's specific format.\n\nThe returned database must be closed by `Database#close`.","summary":"<p>Creates a <code><a href=\"DB/Database.html\">Database</a></code> pool and opens initial connection(s) as specified in the connection <em>uri</em>.</p>","abstract":false,"args":[{"name":"uri","external_name":"uri","restriction":"URI | String"}],"args_string":"(uri : URI | String)","args_html":"(uri : URI | String)","location":{"filename":"src/db.cr","line_number":122,"url":"https://github.com/crystal-lang/crystal-db/blob/v0.13.1/src/db.cr#L122"},"def":{"name":"open","args":[{"name":"uri","external_name":"uri","restriction":"URI | String"}],"visibility":"Public","body":"build_database(uri)"}},{"html_id":"open(uri:URI|String,&)-class-method","name":"open","doc":"Same as `#open` but the database is yielded and closed automatically at the end of the block.","summary":"<p>Same as <code><a href=\"DB.html#open%28uri%3AURI%7CString%29-class-method\">#open</a></code> but the database is yielded and closed automatically at the end of the block.</p>","abstract":false,"args":[{"name":"uri","external_name":"uri","restriction":"URI | String"}],"args_string":"(uri : URI | String, &)","args_html":"(uri : URI | String, &)","location":{"filename":"src/db.cr","line_number":127,"url":"https://github.com/crystal-lang/crystal-db/blob/v0.13.1/src/db.cr#L127"},"def":{"name":"open","args":[{"name":"uri","external_name":"uri","restriction":"URI | String"}],"yields":1,"block_arity":1,"visibility":"Public","body":"db = build_database(uri)\nbegin\n  yield db\nensure\n  db.close\nend\n"}},{"html_id":"register_driver(driver_name,driver_class:Driver.class)-class-method","name":"register_driver","doc":"Registers a driver class for a given *driver_name*.\nShould be called by drivers implementors only.","summary":"<p>Registers a driver class for a given <em>driver_name</em>.</p>","abstract":false,"args":[{"name":"driver_name","external_name":"driver_name","restriction":""},{"name":"driver_class","external_name":"driver_class","restriction":"Driver.class"}],"args_string":"(driver_name, driver_class : Driver.class)","args_html":"(driver_name, driver_class : <span class=\"t\">Driver</span>.<span class=\"k\">class</span>)","location":{"filename":"src/db.cr","line_number":106,"url":"https://github.com/crystal-lang/crystal-db/blob/v0.13.1/src/db.cr#L106"},"def":{"name":"register_driver","args":[{"name":"driver_name","external_name":"driver_name","restriction":""},{"name":"driver_class","external_name":"driver_class","restriction":"Driver.class"}],"visibility":"Public","body":"drivers[driver_name] = driver_class"}}],"macros":[{"html_id":"mapping(properties,strict=true)-macro","name":"mapping","doc":"The `DB.mapping` macro defines how an object is built from a `ResultSet`.\n\nIt takes hash literal as argument, in which attributes and types are defined.\nOnce defined, `ResultSet#read(t)` populates properties of the class from the\n`ResultSet`.\n\n```\nrequire \"db\"\n\nclass Employee\n  DB.mapping({\n    title: String,\n    name:  String,\n  })\nend\n\nemployees = Employee.from_rs(db.query(\"SELECT title, name FROM employees\"))\nemployees[0].title # => \"Manager\"\nemployees[0].name  # => \"John\"\n```\n\nAttributes not mapped with `DB.mapping` are not defined as properties.\nAlso, missing attributes raise a `DB::MappingException`.\n\nYou can also define attributes for each property.\n\n```\nclass Employee\n  DB.mapping({\n    title: String,\n    name:  {\n      type:    String,\n      nilable: true,\n      key:     \"firstname\",\n    },\n  })\nend\n```\n\nAvailable attributes:\n\n* *type* (required) defines its type. In the example above, *title: String* is a shortcut to *title: {type: String}*.\n* *nilable* defines if a property can be a `Nil`.\n* **default**: value to use if the property is missing in the result set, or if it's `null` and `nilable` was not set to `true`. If the default value creates a new instance of an object (for example `[1, 2, 3]` or `SomeObject.new`), a different instance will be used each time a row is parsed.\n* *key* defines which column to read from a `ResultSet`. It defaults to the name of the property.\n* *converter* takes an alternate type for parsing. It requires a `#from_rs` method in that class, and returns an instance of the given type.\n\nThe mapping also automatically defines Crystal properties (getters and setters) for each\nof the keys. It doesn't define a constructor accepting those arguments, but you can provide\nan overload.\n\nThe macro basically defines a constructor accepting a `ResultSet` that reads from\nit and initializes this type's instance variables.\n\nThis macro also declares instance variables of the types given in the mapping.","summary":"<p>The <code><a href=\"DB.html#mapping%28%2A%2Aproperties%29-macro\">DB.mapping</a></code> macro defines how an object is built from a <code><a href=\"DB/ResultSet.html\">ResultSet</a></code>.</p>\n<p><span class=\"flag red\">DEPRECATED</span>  Use <code><a href=\"DB/Serializable.html\">DB::Serializable</a></code> instead</p>","abstract":false,"args":[{"name":"properties","external_name":"properties","restriction":""},{"name":"strict","default_value":"true","external_name":"strict","restriction":""}],"args_string":"(properties, strict = true)","args_html":"(properties, strict = <span class=\"n\">true</span>)","location":{"filename":"src/db/mapping.cr","line_number":62,"url":"https://github.com/crystal-lang/crystal-db/blob/v0.13.1/src/db/mapping.cr#L62"},"def":{"name":"mapping","args":[{"name":"properties","external_name":"properties","restriction":""},{"name":"strict","default_value":"true","external_name":"strict","restriction":""}],"visibility":"Public","body":"    include ::DB::Mappable\n\n    \n{% for key, value in properties %}\n      {% unless value.is_a?(HashLiteral) || value.is_a?(NamedTupleLiteral)\n  properties[key] = {type: value}\nend %}\n    {% end %}\n\n\n    \n{% for key, value in properties %}\n      {% if value[:type].is_a?(Generic) && (value[:type].type_vars.map(&.resolve).includes?(Nil))\n  value[:nilable] = true\nend %}\n\n      {% if (value[:type].is_a?(Call) && (value[:type].name == \"|\")) && ((value[:type].receiver.resolve == Nil) || value[:type].args.map(&.resolve).any?(&.==(Nil))) %}\n        {% value[:nilable] = true %}\n      {% end %}\n    {% end %}\n\n\n    \n{% for key, value in properties %}\n      @{{ key.id }} : {{ value[:type] }} {{ (value[:nilable] ? \"?\" : \"\").id }}\n\n      def {{ key.id }}=(_{{ key.id }} : {{ value[:type] }} {{ (value[:nilable] ? \"?\" : \"\").id }})\n        @{{ key.id }} = _{{ key.id }}\n      end\n\n      def {{ key.id }}\n        @{{ key.id }}\n      end\n    {% end %}\n\n\n    def self.from_rs(\n%rs\n : ::DB::ResultSet)\n      \n%objs\n = Array(self).new\n      \n%rs\n.each do\n        \n%objs\n << self.new(\n%rs\n)\n      \nend\n      \n%objs\n\n    \nensure\n      \n%rs\n.close\n    \nend\n\n    def initialize(\n%rs\n : ::DB::ResultSet)\n      \n{% for key, value in properties %}\n        %var{key.id} = nil\n        %found{key.id} = false\n      {% end %}\n\n\n      \n%rs\n.each_column do |col_name|\n        case col_name\n          \n{% for key, value in properties %}\n            when {{ value[:key] || key.id.stringify }}\n              %found{key.id} = true\n              %var{key.id} =\n                {% if value[:converter] %}\n                  {{ value[:converter] }}.from_rs(%rs)\n                {% else %}{% if value[:nilable] || (value[:default] != nil) %}\n                  %rs.read(::Union({{ value[:type] }} | Nil))\n                {% else %}\n                  %rs.read({{ value[:type] }})\n                {% end %}{% end %}\n          {% end %}\n\n          \nelse\n            \n{% if strict %}\n              raise ::DB::MappingException.new(\"unknown result set attribute: #{col_name}\", self.class.to_s)\n            {% else %}\n              %rs.read\n            {% end %}\n\n        \nend\n      \nend\n\n      \n{% for key, value in properties %}\n        {% if value[:nilable] || (value[:default] != nil) %}{% else %}\n          if %var{key.id}.is_a?(Nil) && !%found{key.id}\n            raise ::DB::MappingException.new(\"missing result set attribute: {{ (value[:key] || key).id }}\", self.class.to_s)\n          end\n        {% end %}\n      {% end %}\n\n\n      \n{% for key, value in properties %}\n        {% if value[:nilable] %}\n          {% if value[:default] != nil %}\n            @{{ key.id }} = %found{key.id} ? %var{key.id} : {{ value[:default] }}\n          {% else %}\n            @{{ key.id }} = %var{key.id}\n          {% end %}\n        {% else %}{% if value[:default] != nil %}\n          @{{ key.id }} = %var{key.id}.is_a?(Nil) ? {{ value[:default] }} : %var{key.id}\n        {% else %}\n          @{{ key.id }} = %var{key.id}.as({{ value[:type] }})\n        {% end %}{% end %}\n      {% end %}\n\n    \nend\n  \n"}},{"html_id":"mapping(**properties)-macro","name":"mapping","summary":"<p><span class=\"flag red\">DEPRECATED</span>  Use <code><a href=\"DB/Serializable.html\">DB::Serializable</a></code> 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The format is specified by the individual\ndatabase drivers, yet there are some common properties names usually shared.\nSee the [reference book](https://crystal-lang.org/reference/database/) for examples.\n\nThe connection pool can be configured from URI parameters:\n\n  - `initial_pool_size` (default 1)\n  - `max_pool_size` (default 0 = unlimited)\n  - `max_idle_pool_size` (default 1)\n  - `checkout_timeout` (default 5.0)\n  - `retry_attempts` (default 1)\n  - `retry_delay` (in seconds, default 1.0)\n\nWhen querying a database, prepared statements are used by default.\nThis can be changed from the `prepared_statements` URI parameter:\n\n  - `prepared_statements` (true, or false, default true)\n","summary":"<p>Acts as an entry point for database access.</p>","constructors":[{"html_id":"new(connection_options:Connection::Options,pool_options:Pool::Options,&factory:->Connection)-class-method","name":"new","doc":"Initialize a database with the specified options and connection factory.\nThis covers more advanced use cases that might not be supported by an URI connection string such as tunneling connection.","summary":"<p>Initialize a database with the specified options and connection factory.</p>","abstract":false,"args":[{"name":"connection_options","external_name":"connection_options","restriction":"Connection::Options"},{"name":"pool_options","external_name":"pool_options","restriction":"Pool::Options"}],"args_string":"(connection_options : Connection::Options, pool_options : Pool::Options, &factory :  -> Connection)","args_html":"(connection_options : <a href=\"../DB/Connection/Options.html\">Connection::Options</a>, pool_options : <a href=\"../DB/Pool/Options.html\">Pool::Options</a>, &factory :  -> <a href=\"../DB/Connection.html\">Connection</a>)","location":{"filename":"src/db/database.cr","line_number":44,"url":"https://github.com/crystal-lang/crystal-db/blob/v0.13.1/src/db/database.cr#L44"},"def":{"name":"new","args":[{"name":"connection_options","external_name":"connection_options","restriction":"Connection::Options"},{"name":"pool_options","external_name":"pool_options","restriction":"Pool::Options"}],"yields":0,"block_arity":0,"block_arg":{"name":"factory","external_name":"factory","restriction":"(-> Connection)"},"visibility":"Public","body":"_ = allocate\n_.initialize(connection_options, pool_options, &factory) do\n  yield\nend\nif _.responds_to?(:finalize)\n  ::GC.add_finalizer(_)\nend\n_\n"}}],"instance_methods":[{"html_id":"checkout-instance-method","name":"checkout","doc":"returns a connection from the pool\nthe returned connection must be returned\nto the pool by explictly calling `Connection#release`","summary":"<p>returns a connection from the pool the returned connection must be returned to the pool by explictly calling <code><a href=\"../DB/Connection.html#release-instance-method\">Connection#release</a></code></p>","abstract":false,"location":{"filename":"src/db/database.cr","line_number":126,"url":"https://github.com/crystal-lang/crystal-db/blob/v0.13.1/src/db/database.cr#L126"},"def":{"name":"checkout","visibility":"Public","body":"connection = @pool.checkout\nconnection.auto_release = false\nconnection\n"}},{"html_id":"close-instance-method","name":"close","doc":"Closes all connection to the database.","summary":"<p>Closes all connection to the database.</p>","abstract":false,"location":{"filename":"src/db/database.cr","line_number":82,"url":"https://github.com/crystal-lang/crystal-db/blob/v0.13.1/src/db/database.cr#L82"},"def":{"name":"close","visibility":"Public","body":"@pool.close"}},{"html_id":"prepared_statements?:Bool-instance-method","name":"prepared_statements?","doc":"Returns whether by default the statements should\nbe prepared or not.","summary":"<p>Returns whether by default the statements should be prepared or not.</p>","abstract":false,"location":{"filename":"src/db/database.cr","line_number":57,"url":"https://github.com/crystal-lang/crystal-db/blob/v0.13.1/src/db/database.cr#L57"},"def":{"name":"prepared_statements?","return_type":"Bool","visibility":"Public","body":"@connection_options.prepared_statements"}},{"html_id":"prepared_statements_cache?:Bool-instance-method","name":"prepared_statements_cache?","abstract":false,"location":{"filename":"src/db/database.cr","line_number":61,"url":"https://github.com/crystal-lang/crystal-db/blob/v0.13.1/src/db/database.cr#L61"},"def":{"name":"prepared_statements_cache?","return_type":"Bool","visibility":"Public","body":"@connection_options.prepared_statements_cache"}},{"html_id":"setup_connection(&proc:Connection->Nil)-instance-method","name":"setup_connection","doc":"Run the specified block every time a new connection is established, yielding the new connection\nto the block.\n\n```\ndb = DB.open(DB_URL)\ndb.setup_connection do |connection|\n  connection.exec \"SET TIME ZONE 'America/New_York'\"\nend\n```","summary":"<p>Run the specified block every time a new connection is established, yielding the new connection to the block.</p>","abstract":false,"location":{"filename":"src/db/database.cr","line_number":74,"url":"https://github.com/crystal-lang/crystal-db/blob/v0.13.1/src/db/database.cr#L74"},"def":{"name":"setup_connection","yields":1,"block_arity":1,"block_arg":{"name":"proc","external_name":"proc","restriction":"(Connection -> Nil)"},"visibility":"Public","body":"@setup_connection = proc\n@pool.each_resource do |conn|\n  @setup_connection.call(conn)\nend\n"}},{"html_id":"transaction(&)-instance-method","name":"transaction","doc":"yields a `Transaction` from a connection of the pool\nRefer to `BeginTransaction#transaction` for documentation.","summary":"<p>yields a <code><a 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ends</p>","abstract":false,"location":{"filename":"src/db/database.cr","line_number":114,"url":"https://github.com/crystal-lang/crystal-db/blob/v0.13.1/src/db/database.cr#L114"},"def":{"name":"using_connection","yields":1,"block_arity":1,"visibility":"Public","body":"connection = self.checkout\nbegin\n  yield connection\nensure\n  connection.release\nend\n"}}]},{"html_id":"db/DB/Disposable","path":"DB/Disposable.html","kind":"module","full_name":"DB::Disposable","name":"Disposable","abstract":false,"locations":[{"filename":"src/db/disposable.cr","line_number":3,"url":"https://github.com/crystal-lang/crystal-db/blob/v0.13.1/src/db/disposable.cr#L3"}],"repository_name":"db","program":false,"enum":false,"alias":false,"const":false,"including_types":[{"html_id":"db/DB/Connection","kind":"class","full_name":"DB::Connection","name":"Connection"},{"html_id":"db/DB/ResultSet","kind":"class","full_name":"DB::ResultSet","name":"ResultSet"},{"html_id":"db/DB/Statement","kind":"class","full_name":"DB::Statement","name":"Statement"},{"html_id":"db/DB/Transaction","kind":"class","full_name":"DB::Transaction","name":"Transaction"}],"namespace":{"html_id":"db/DB","kind":"module","full_name":"DB","name":"DB"},"doc":"Generic module to encapsulate disposable db resources.","summary":"<p>Generic module to encapsulate disposable db resources.</p>","instance_methods":[{"html_id":"close-instance-method","name":"close","doc":"Closes this object.","summary":"<p>Closes this object.</p>","abstract":false,"location":{"filename":"src/db/disposable.cr","line_number":9,"url":"https://github.com/crystal-lang/crystal-db/blob/v0.13.1/src/db/disposable.cr#L9"},"def":{"name":"close","visibility":"Public","body":"if @closed\n  return\nend\ndo_close\n@closed = true\n"}},{"html_id":"closed?-instance-method","name":"closed?","doc":"Returns `true` if this object is closed. See `#close`.","summary":"<p>Returns <code>true</code> if this object is closed.</p>","abstract":false,"location":{"filename":"src/db/disposable.cr","line_number":16,"url":"https://github.com/crystal-lang/crystal-db/blob/v0.13.1/src/db/disposable.cr#L16"},"def":{"name":"closed?","visibility":"Public","body":"@closed"}}]},{"html_id":"db/DB/Driver","path":"DB/Driver.html","kind":"class","full_name":"DB::Driver","name":"Driver","abstract":true,"superclass":{"html_id":"db/Reference","kind":"class","full_name":"Reference","name":"Reference"},"ancestors":[{"html_id":"db/Reference","kind":"class","full_name":"Reference","name":"Reference"},{"html_id":"db/Object","kind":"class","full_name":"Object","name":"Object"}],"locations":[{"filename":"src/db/driver.cr","line_number":44,"url":"https://github.com/crystal-lang/crystal-db/blob/v0.13.1/src/db/driver.cr#L44"}],"repository_name":"db","program":false,"enum":false,"alias":false,"const":false,"namespace":{"html_id":"db/DB","kind":"module","full_name":"DB","name":"DB"},"doc":"Database driver implementors must subclass `Driver`,\nregister with a driver_name using `DB#register_driver` and\noverride the factory method `#connection_builder`.\n\n```\nrequire \"db\"\n\nclass FakeDriver < DB::Driver\n  class FakeConnectionBuilder < DB::ConnectionBuilder\n    def initialize(@options : DB::Connection::Options)\n    end\n\n    def build : DB::Connection\n      FakeConnection.new(@options)\n    end\n  end\n\n  def connection_builder(uri : URI) : ConnectionBuilder\n    params = HTTP::Params.parse(uri.query || \"\")\n    options = connection_options(params)\n    # If needed, parse custom options from uri here\n    # so they are parsed only once.\n    FakeConnectionBuilder.new(options)\n  end\nend\n\nDB.register_driver \"fake\", FakeDriver\n```\n\nAccess to this fake database will be available with\n\n```\nDB.open \"fake://...\" do |db|\n  # ... use db ...\nend\n```\n\nRefer to `Connection`, `Statement` and `ResultSet` for further\ndriver implementation instructions.\n\nOverride `#connection_options` and `#pool_options` to provide custom\ndefaults or parsing of the connection string URI.","summary":"<p>Database driver implementors must subclass <code><a href=\"../DB/Driver.html\">Driver</a></code>, register with a driver_name using <code><a href=\"../DB.html#register_driver%28driver_name%2Cdriver_class%3ADriver.class%29-class-method\">DB#register_driver</a></code> and override the factory method <code><a href=\"../DB/Driver.html#connection_builder%28uri%3AURI%29%3AConnectionBuilder-instance-method\">#connection_builder</a></code>.</p>","instance_methods":[{"html_id":"connection_builder(uri:URI):ConnectionBuilder-instance-method","name":"connection_builder","doc":"Returns a new connection factory.\n\nNOTE: For implementors *uri* should be parsed once. 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\"NULL\" : \"NOT NULL\"})\"\n  end\nend\n```\n\nThe following methods needs to be called to configure the appropiate syntax\nfor different commands and allow all the specs to run: `binding_syntax`, `create_table_1column_syntax`,\n`create_table_2columns_syntax`, `select_1column_syntax`, `select_2columns_syntax`, `select_count_syntax`,\n`select_scalar_syntax`, `insert_1column_syntax`, `insert_2columns_syntax`, `drop_table_if_exists_syntax`.\n","summary":"<p>Helper class to ensure behaviour of custom drivers</p>","class_methods":[{"html_id":"run(description=\"asadb\",&)-class-method","name":"run","abstract":false,"args":[{"name":"description","default_value":"\"as a db\"","external_name":"description","restriction":""}],"args_string":"(description = \"as a db\", &)","args_html":"(description = <span class=\"s\">&quot;as a db&quot;</span>, &)","location":{"filename":"src/spec.cr","line_number":537,"url":"https://github.com/crystal-lang/crystal-db/blob/v0.13.1/src/spec.cr#L537"},"def":{"name":"run","args":[{"name":"description","default_value":"\"as a db\"","external_name":"description","restriction":""}],"yields":1,"block_arity":1,"visibility":"Public","body":"ctx = self.new\nwith ctx yield ctx\ndescribe(description) do\n  ctx.include_shared_specs\n  ctx.its.each do |db_it|\n    case db_it.prepared\n    when :default\n      it(db_it.description, db_it.file, db_it.line, db_it.end_line) do\n        ctx.with_db do |db|\n          db_it.block.call(db)\n          nil\n        end\n      end\n    when :both\n      values = [] of Bool\n      if ctx.support_prepared\n        values << true\n      end\n      if ctx.support_unprepared\n        values << false\n      end\n      case values.size\n      when 0\n        raise(\"Neither prepared non unprepared statements allowed\")\n      when 1\n        it(db_it.description, db_it.file, db_it.line, db_it.end_line) do\n          ctx.with_db do |db|\n            db_it.block.call(db)\n            nil\n          end\n        end\n      else\n        {% if (compare_versions(Crystal::VERSION, \"1.9.0\")) >= 0 %}\n                values.each do |prepared_statements|\n                  it(\"#{db_it.description} (prepared_statements=#{prepared_statements})\", db_it.file, db_it.line, db_it.end_line) do\n                    ctx.with_db \"prepared_statements=#{prepared_statements}\" do |db|\n                      db_it.block.call db\n                      nil\n                    end\n                  end\n                end\n              {% end %}\n      end\n    else\n      raise(\"Invalid prepared value. 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module converts DB supported values to `::Log::Metadata::Value`\n\n### Note to implementors\n\nIf the driver defines custom types to be used as arguments the default behavior\nwill be converting the value via `#to_s`. Otherwise you can define overloads to\nchange this behaviour.\n\n```\nmodule DB::MetadataValueConverter\n  def self.arg_to_log(arg : PG::Geo::Point)\n    ::Log::Metadata::Value.new(\"(#{arg.x}, #{arg.y})::point\")\n  end\nend\n```","summary":"<p>This module converts DB supported values to <code>::Log::Metadata::Value</code></p>","class_methods":[{"html_id":"arg_to_log(arg:Enumerable):::Log::Metadata::Value-class-method","name":"arg_to_log","doc":"Returns *arg* encoded as a `::Log::Metadata::Value`.","summary":"<p>Returns <em>arg</em> encoded as a <code>::Log::Metadata::Value</code>.</p>","abstract":false,"args":[{"name":"arg","external_name":"arg","restriction":"Enumerable"}],"args_string":"(arg : Enumerable) : ::Log::Metadata::Value","args_html":"(arg : Enumerable) : 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when a scalar query returns no results.","summary":"<p>Raised when a scalar query returns no results.</p>"},{"html_id":"db/DB/Pool","path":"DB/Pool.html","kind":"class","full_name":"DB::Pool(T)","name":"Pool","abstract":false,"superclass":{"html_id":"db/Reference","kind":"class","full_name":"Reference","name":"Reference"},"ancestors":[{"html_id":"db/Reference","kind":"class","full_name":"Reference","name":"Reference"},{"html_id":"db/Object","kind":"class","full_name":"Object","name":"Object"}],"locations":[{"filename":"src/db/pool.cr","line_number":6,"url":"https://github.com/crystal-lang/crystal-db/blob/v0.13.1/src/db/pool.cr#L6"}],"repository_name":"db","program":false,"enum":false,"alias":false,"const":false,"namespace":{"html_id":"db/DB","kind":"module","full_name":"DB","name":"DB"},"constructors":[{"html_id":"new(pool_options:Options=Options.new,&factory:->T)-class-method","name":"new","abstract":false,"args":[{"name":"pool_options","default_value":"Options.new","external_name":"pool_options","restriction":"Options"}],"args_string":"(pool_options : Options = Options.new, 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href=\"../DB/Pool.html#new%28pool_options%3AOptions%3DOptions.new%2C%26factory%3A-%3ET%29-class-method\">#new</a></code> with DB::Pool::Options instead</p>","abstract":false,"args":[{"name":"initial_pool_size","default_value":"1","external_name":"initial_pool_size","restriction":""},{"name":"max_pool_size","default_value":"0","external_name":"max_pool_size","restriction":""},{"name":"max_idle_pool_size","default_value":"1","external_name":"max_idle_pool_size","restriction":""},{"name":"checkout_timeout","default_value":"5.0","external_name":"checkout_timeout","restriction":""},{"name":"retry_attempts","default_value":"1","external_name":"retry_attempts","restriction":""},{"name":"retry_delay","default_value":"0.2","external_name":"retry_delay","restriction":""}],"args_string":"(initial_pool_size = 1, max_pool_size = 0, max_idle_pool_size = 1, checkout_timeout = 5.0, retry_attempts = 1, retry_delay = 0.2, &factory :  -> T)","args_html":"(initial_pool_size = <span class=\"n\">1</span>, 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checkout_timeout, retry_attempts, retry_delay, &factory) do\n  yield\nend\nif _.responds_to?(:finalize)\n  ::GC.add_finalizer(_)\nend\n_\n"}}],"instance_methods":[{"html_id":"checkout:T-instance-method","name":"checkout","abstract":false,"location":{"filename":"src/db/pool.cr","line_number":112,"url":"https://github.com/crystal-lang/crystal-db/blob/v0.13.1/src/db/pool.cr#L112"},"def":{"name":"checkout","return_type":"T","visibility":"Public","body":"res = sync do\n  resource = nil\n  while !resource\n    resource = if @idle.empty?\n      if can_increase_pool?\n        @inflight = @inflight + 1\n        begin\n          r = unsync do\n            build_resource\n          end\n        ensure\n          @inflight = @inflight - 1\n        end\n        r\n      else\n        unsync do\n          wait_for_available\n        end\n        pick_available\n      end\n    else\n      pick_available\n    end\n  end\n  @idle.delete(resource)\n  resource\nend\nif 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resource\n      if resource.responds_to?(:after_release)\n        resource.after_release\n      end\n      idle_pushed = true\n    else\n      resource.close\n      @total.delete(resource)\n    end\n  end\nend\nif idle_pushed\n  select\nwhen @availability_channel.send(nil)\nelse\nend\n\nend\n"}},{"html_id":"stats-instance-method","name":"stats","doc":"Returns stats of the pool","summary":"<p>Returns stats of the pool</p>","abstract":false,"location":{"filename":"src/db/pool.cr","line_number":103,"url":"https://github.com/crystal-lang/crystal-db/blob/v0.13.1/src/db/pool.cr#L103"},"def":{"name":"stats","visibility":"Public","body":"Stats.new(open_connections: @total.size, idle_connections: @idle.size, in_flight_connections: @inflight, max_connections: 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WHERE age > ?\", args: [age])\n```\n\nConvention of mapping how arguments are mapped to the query depends on each driver.\n\nIncluding `QueryMethods` requires a `build(query) : Statement` method that is not expected\nto be called directly.","summary":"<p>Methods to allow querying a database.</p>","instance_methods":[{"html_id":"exec(query,*args_,args:Array|Nil=nil)-instance-method","name":"exec","doc":"Performs the `query` and returns an `ExecResult`","summary":"<p>Performs the <code><a href=\"../DB/QueryMethods.html#query%28query%2C%2Aargs_%2Cargs%3AArray%7CNil%3Dnil%29-instance-method\">#query</a></code> and returns an <code><a href=\"../DB/ExecResult.html\">ExecResult</a></code></p>","abstract":false,"args":[{"name":"query","external_name":"query","restriction":""},{"name":"args_","external_name":"args_","restriction":""},{"name":"args","default_value":"nil","external_name":"args","restriction":"Array | ::Nil"}],"args_string":"(query, *args_, args : Array | Nil = nil)","args_html":"(query, *args_, args : Array | Nil = <span class=\"n\">nil</span>)","location":{"filename":"src/db/query_methods.cr","line_number":274,"url":"https://github.com/crystal-lang/crystal-db/blob/v0.13.1/src/db/query_methods.cr#L274"},"def":{"name":"exec","args":[{"name":"query","external_name":"query","restriction":""},{"name":"args_","external_name":"args_","restriction":""},{"name":"args","default_value":"nil","external_name":"args","restriction":"Array | ::Nil"}],"splat_index":1,"visibility":"Public","body":"(build(query)).exec(*args_, args: args)"}},{"html_id":"query(query,*args_,args:Array|Nil=nil)-instance-method","name":"query","doc":"Executes a *query* and returns a `ResultSet` with the results.\nThe `ResultSet` must be closed manually.\n\n```\nresult = db.query \"select name from contacts where id = ?\", 10\nbegin\n  if result.move_next\n    id = result.read(Int32)\n  end\nensure\n  result.close\nend\n```\n\nNote: to use a dynamic list length of arguments use `args:` keyword argument.\n\n```\nresult = db.query \"select name from contacts where id = ?\", args: [10]\n```\n","summary":"<p>Executes a <em>query</em> and returns a <code><a href=\"../DB/ResultSet.html\">ResultSet</a></code> with the results.</p>","abstract":false,"args":[{"name":"query","external_name":"query","restriction":""},{"name":"args_","external_name":"args_","restriction":""},{"name":"args","default_value":"nil","external_name":"args","restriction":"Array | ::Nil"}],"args_string":"(query, *args_, args : Array | Nil = nil)","args_html":"(query, *args_, args : Array | Nil = <span class=\"n\">nil</span>)","location":{"filename":"src/db/query_methods.cr","line_number":45,"url":"https://github.com/crystal-lang/crystal-db/blob/v0.13.1/src/db/query_methods.cr#L45"},"def":{"name":"query","args":[{"name":"query","external_name":"query","restriction":""},{"name":"args_","external_name":"args_","restriction":""},{"name":"args","default_value":"nil","external_name":"args","restriction":"Array | ::Nil"}],"splat_index":1,"visibility":"Public","body":"(build(query)).query(*args_, args: args)"}},{"html_id":"query(query,*args_,args:Array|Nil=nil,&)-instance-method","name":"query","doc":"Executes a *query* and yields a `ResultSet` with the results.\nThe `ResultSet` is closed automatically.\n\n```\ndb.query(\"select name from contacts where age > ?\", 18) do |rs|\n  rs.each do\n    name = rs.read(String)\n  end\nend\n```","summary":"<p>Executes a <em>query</em> and yields a <code><a href=\"../DB/ResultSet.html\">ResultSet</a></code> with the results.</p>","abstract":false,"args":[{"name":"query","external_name":"query","restriction":""},{"name":"args_","external_name":"args_","restriction":""},{"name":"args","default_value":"nil","external_name":"args","restriction":"Array | ::Nil"}],"args_string":"(query, *args_, args : Array | Nil = nil, &)","args_html":"(query, *args_, args : Array | Nil = <span class=\"n\">nil</span>, &)","location":{"filename":"src/db/query_methods.cr","line_number":59,"url":"https://github.com/crystal-lang/crystal-db/blob/v0.13.1/src/db/query_methods.cr#L59"},"def":{"name":"query","args":[{"name":"query","external_name":"query","restriction":""},{"name":"args_","external_name":"args_","restriction":""},{"name":"args","default_value":"nil","external_name":"args","restriction":"Array | ::Nil"}],"splat_index":1,"yields":1,"block_arity":1,"visibility":"Public","body":"rs = query(query, *args_, args: args)\nbegin\n  yield rs\nensure\n  rs.close\nend\n"}},{"html_id":"query_all(query,*args_,args:Array|Nil=nil,&block:ResultSet->U):Array(U)forallU-instance-method","name":"query_all","doc":"Executes a *query* and yield a `ResultSet` positioned at the beginning\nof each row, returning an array of the values of the blocks.\n\n```\nnames = db.query_all \"select name from contacts\", &.read(String)\n```","summary":"<p>Executes a <em>query</em> and yield a <code><a href=\"../DB/ResultSet.html\">ResultSet</a></code> positioned at the beginning of each row, returning an array of the values of the blocks.</p>","abstract":false,"args":[{"name":"query","external_name":"query","restriction":""},{"name":"args_","external_name":"args_","restriction":""},{"name":"args","default_value":"nil","external_name":"args","restriction":"Array | ::Nil"}],"args_string":"(query, *args_, args : Array | Nil = nil, &block : ResultSet -> U) : Array(U) forall U","args_html":"(query, *args_, args : Array | Nil = <span class=\"n\">nil</span>, &block : <a href=\"../DB/ResultSet.html\">ResultSet</a> -> U) : Array(U) forall U","location":{"filename":"src/db/query_methods.cr","line_number":212,"url":"https://github.com/crystal-lang/crystal-db/blob/v0.13.1/src/db/query_methods.cr#L212"},"def":{"name":"query_all","args":[{"name":"query","external_name":"query","restriction":""},{"name":"args_","external_name":"args_","restriction":""},{"name":"args","default_value":"nil","external_name":"args","restriction":"Array | ::Nil"}],"splat_index":1,"yields":1,"block_arity":1,"block_arg":{"name":"block","external_name":"block","restriction":"(ResultSet -> U)"},"return_type":"Array(U)","visibility":"Public","body":"ary = [] of U\nquery_each(query, *args_, args: args) do |rs|\n  ary.push(yield rs)\nend\nary\n"}},{"html_id":"query_all(query,*args_,args:Array|Nil=nil,astypes:Tuple)-instance-method","name":"query_all","doc":"Executes a *query* and returns an array where each row is\nread as a tuple of the given *types*.\n\n```\ncontacts = db.query_all \"select name, age from contacts\", as: {String, Int32}\n```","summary":"<p>Executes a <em>query</em> and returns an array where each row is read as a tuple of the given <em>types</em>.</p>","abstract":false,"args":[{"name":"query","external_name":"query","restriction":""},{"name":"args_","external_name":"args_","restriction":""},{"name":"args","default_value":"nil","external_name":"args","restriction":"Array | ::Nil"},{"name":"types","external_name":"as","restriction":"Tuple"}],"args_string":"(query, *args_, args : Array | Nil = nil, as types : Tuple)","args_html":"(query, *args_, args : Array | Nil = <span class=\"n\">nil</span>, as types : 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Int32}\n```","summary":"<p>Executes a <em>query</em> and returns an array where each row is read as a named tuple of the given <em>types</em> (the keys of the named tuple are not necessarily the column names).</p>","abstract":false,"args":[{"name":"query","external_name":"query","restriction":""},{"name":"args_","external_name":"args_","restriction":""},{"name":"args","default_value":"nil","external_name":"args","restriction":"Array | ::Nil"},{"name":"types","external_name":"as","restriction":"NamedTuple"}],"args_string":"(query, *args_, args : Array | Nil = nil, as types : NamedTuple)","args_html":"(query, *args_, args : Array | Nil = <span class=\"n\">nil</span>, as types : 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<em>type</em>.</p>","abstract":false,"args":[{"name":"query","external_name":"query","restriction":""},{"name":"args_","external_name":"args_","restriction":""},{"name":"args","default_value":"nil","external_name":"args","restriction":"Array | ::Nil"},{"name":"type","external_name":"as","restriction":"Class"}],"args_string":"(query, *args_, args : Array | Nil = nil, as type : Class)","args_html":"(query, *args_, args : Array | Nil = <span class=\"n\">nil</span>, as type : Class)","location":{"filename":"src/db/query_methods.cr","line_number":251,"url":"https://github.com/crystal-lang/crystal-db/blob/v0.13.1/src/db/query_methods.cr#L251"},"def":{"name":"query_all","args":[{"name":"query","external_name":"query","restriction":""},{"name":"args_","external_name":"args_","restriction":""},{"name":"args","default_value":"nil","external_name":"args","restriction":"Array | ::Nil"},{"name":"type","external_name":"as","restriction":"Class"}],"splat_index":1,"visibility":"Public","body":"query_all(query, *args_, args: args) do |rs|\n  rs.read(type)\nend"}},{"html_id":"query_each(query,*args_,args:Array|Nil=nil,&)-instance-method","name":"query_each","doc":"Executes a *query* and yields the `ResultSet` once per each row.\nThe `ResultSet` is closed automatically.\n\n```\ndb.query_each \"select name from contacts\" do |rs|\n  puts rs.read(String)\nend\n```","summary":"<p>Executes a <em>query</em> and yields the <code><a href=\"../DB/ResultSet.html\">ResultSet</a></code> once per each row.</p>","abstract":false,"args":[{"name":"query","external_name":"query","restriction":""},{"name":"args_","external_name":"args_","restriction":""},{"name":"args","default_value":"nil","external_name":"args","restriction":"Array | ::Nil"}],"args_string":"(query, *args_, args : Array | Nil = nil, &)","args_html":"(query, *args_, args : Array | Nil = <span class=\"n\">nil</span>, &)","location":{"filename":"src/db/query_methods.cr","line_number":265,"url":"https://github.com/crystal-lang/crystal-db/blob/v0.13.1/src/db/query_methods.cr#L265"},"def":{"name":"query_each","args":[{"name":"query","external_name":"query","restriction":""},{"name":"args_","external_name":"args_","restriction":""},{"name":"args","default_value":"nil","external_name":"args","restriction":"Array | ::Nil"}],"splat_index":1,"yields":1,"block_arity":1,"visibility":"Public","body":"query(query, *args_, args: args) do |rs|\n  rs.each do\n    yield rs\n  end\nend"}},{"html_id":"query_one(query,*args_,args:Array|Nil=nil,&block:ResultSet->U):UforallU-instance-method","name":"query_one","doc":"Executes a *query* that expects a single row and yields a `ResultSet`\npositioned at that first row.\n\nThe given block must not invoke `move_next` on the yielded result set.\n\nRaises `DB::NoResultsError` if there were no rows.\nRaises `DB::Error` if there were more than one row.\n\n```\nname = db.query_one \"select name from contacts where id = ?\", 18, &.read(String)\n```","summary":"<p>Executes a <em>query</em> that expects a single row and yields a <code><a href=\"../DB/ResultSet.html\">ResultSet</a></code> positioned at that first row.</p>","abstract":false,"args":[{"name":"query","external_name":"query","restriction":""},{"name":"args_","external_name":"args_","restriction":""},{"name":"args","default_value":"nil","external_name":"args","restriction":"Array | ::Nil"}],"args_string":"(query, *args_, args : Array | Nil = nil, &block : ResultSet -> U) : U forall U","args_html":"(query, *args_, args : Array | Nil = <span class=\"n\">nil</span>, &block : <a href=\"../DB/ResultSet.html\">ResultSet</a> -> U) : U forall U","location":{"filename":"src/db/query_methods.cr","line_number":76,"url":"https://github.com/crystal-lang/crystal-db/blob/v0.13.1/src/db/query_methods.cr#L76"},"def":{"name":"query_one","args":[{"name":"query","external_name":"query","restriction":""},{"name":"args_","external_name":"args_","restriction":""},{"name":"args","default_value":"nil","external_name":"args","restriction":"Array | ::Nil"}],"splat_index":1,"yields":1,"block_arity":1,"block_arg":{"name":"block","external_name":"block","restriction":"(ResultSet -> U)"},"return_type":"U","visibility":"Public","body":"query(query, *args_, args: args) do |rs|\n  if rs.move_next\n  else\n    raise(DB::NoResultsError.new(\"no results\"))\n  end\n  value = yield rs\n  if rs.move_next\n    raise(DB::Error.new(\"more than one row\"))\n  end\n  return value\nend"}},{"html_id":"query_one(query,*args_,args:Array|Nil=nil,astypes:Tuple)-instance-method","name":"query_one","doc":"Executes a *query* that expects a single row and returns it\nas a tuple of the given *types*.\n\nRaises `DB::NoResultsError` if there were no rows.\nRaises `DB::Error` if there were more than one row.\n\n```\ndb.query_one \"select name, age from contacts where id = ?\", 1, as: {String, Int32}\n```","summary":"<p>Executes a <em>query</em> that expects a single row and returns it as a tuple of the given <em>types</em>.</p>","abstract":false,"args":[{"name":"query","external_name":"query","restriction":""},{"name":"args_","external_name":"args_","restriction":""},{"name":"args","default_value":"nil","external_name":"args","restriction":"Array | ::Nil"},{"name":"types","external_name":"as","restriction":"Tuple"}],"args_string":"(query, *args_, args : Array | Nil = nil, as types : Tuple)","args_html":"(query, *args_, args : Array | Nil = <span class=\"n\">nil</span>, as types : Tuple)","location":{"filename":"src/db/query_methods.cr","line_number":95,"url":"https://github.com/crystal-lang/crystal-db/blob/v0.13.1/src/db/query_methods.cr#L95"},"def":{"name":"query_one","args":[{"name":"query","external_name":"query","restriction":""},{"name":"args_","external_name":"args_","restriction":""},{"name":"args","default_value":"nil","external_name":"args","restriction":"Array | ::Nil"},{"name":"types","external_name":"as","restriction":"Tuple"}],"splat_index":1,"visibility":"Public","body":"query_one(query, *args_, args: args) do |rs|\n  rs.read(*types)\nend"}},{"html_id":"query_one(query,*args_,args:Array|Nil=nil,astypes:NamedTuple)-instance-method","name":"query_one","doc":"Executes a *query* that expects a single row and returns it\nas a named tuple of the given *types* (the keys of the named tuple\nare not necessarily the column names).\n\nRaises `DB::NoResultsError` if there were no rows.\nRaises `DB::Error` if there were more than one row.\n\n```\ndb.query_one \"select name, age from contacts where id = ?\", 1, as: {name: String, age: Int32}\n```","summary":"<p>Executes a <em>query</em> that expects a single row and returns it as a named tuple of the given <em>types</em> (the keys of the named tuple are not necessarily the column names).</p>","abstract":false,"args":[{"name":"query","external_name":"query","restriction":""},{"name":"args_","external_name":"args_","restriction":""},{"name":"args","default_value":"nil","external_name":"args","restriction":"Array | ::Nil"},{"name":"types","external_name":"as","restriction":"NamedTuple"}],"args_string":"(query, *args_, args : Array | Nil = nil, as types : NamedTuple)","args_html":"(query, *args_, args : Array | Nil = <span class=\"n\">nil</span>, as types : NamedTuple)","location":{"filename":"src/db/query_methods.cr","line_number":111,"url":"https://github.com/crystal-lang/crystal-db/blob/v0.13.1/src/db/query_methods.cr#L111"},"def":{"name":"query_one","args":[{"name":"query","external_name":"query","restriction":""},{"name":"args_","external_name":"args_","restriction":""},{"name":"args","default_value":"nil","external_name":"args","restriction":"Array | ::Nil"},{"name":"types","external_name":"as","restriction":"NamedTuple"}],"splat_index":1,"visibility":"Public","body":"query_one(query, *args_, args: args) do |rs|\n  rs.read(**types)\nend"}},{"html_id":"query_one(query,*args_,args:Array|Nil=nil,astype:Class)-instance-method","name":"query_one","doc":"Executes a *query* that expects a single row\nand returns the first column's value as the given *type*.\n\nRaises `DB::NoResultsError` if there were no rows.\nRaises `DB::Error` if there were more than one row.\n\n```\ndb.query_one \"select name from contacts where id = ?\", 1, as: String\n```","summary":"<p>Executes a <em>query</em> that expects a single row and returns the first column's value as the given <em>type</em>.</p>","abstract":false,"args":[{"name":"query","external_name":"query","restriction":""},{"name":"args_","external_name":"args_","restriction":""},{"name":"args","default_value":"nil","external_name":"args","restriction":"Array | ::Nil"},{"name":"type","external_name":"as","restriction":"Class"}],"args_string":"(query, *args_, args : Array | Nil = nil, as type : Class)","args_html":"(query, *args_, args : Array | Nil = <span class=\"n\">nil</span>, as type : Class)","location":{"filename":"src/db/query_methods.cr","line_number":126,"url":"https://github.com/crystal-lang/crystal-db/blob/v0.13.1/src/db/query_methods.cr#L126"},"def":{"name":"query_one","args":[{"name":"query","external_name":"query","restriction":""},{"name":"args_","external_name":"args_","restriction":""},{"name":"args","default_value":"nil","external_name":"args","restriction":"Array | ::Nil"},{"name":"type","external_name":"as","restriction":"Class"}],"splat_index":1,"visibility":"Public","body":"query_one(query, *args_, args: args) do |rs|\n  rs.read(type)\nend"}},{"html_id":"query_one?(query,*args_,args:Array|Nil=nil,&block:ResultSet->U):U|NilforallU-instance-method","name":"query_one?","doc":"Executes a *query* that expects at most a single row and yields a `ResultSet`\npositioned at that first row.\n\nReturns `nil`, not invoking the block, if there were no rows.\n\nRaises `DB::Error` if there were more than one row\n(this ends up invoking the block once).\n\n```\nname = db.query_one? \"select name from contacts where id = ?\", 18, &.read(String)\ntypeof(name) # => String | Nil\n```","summary":"<p>Executes a <em>query</em> that expects at most a single row and yields a <code><a href=\"../DB/ResultSet.html\">ResultSet</a></code> positioned at that first row.</p>","abstract":false,"args":[{"name":"query","external_name":"query","restriction":""},{"name":"args_","external_name":"args_","restriction":""},{"name":"args","default_value":"nil","external_name":"args","restriction":"Array | ::Nil"}],"args_string":"(query, *args_, args : Array | Nil = nil, &block : ResultSet -> U) : U | Nil forall U","args_html":"(query, *args_, args : Array | Nil = <span class=\"n\">nil</span>, &block : <a href=\"../DB/ResultSet.html\">ResultSet</a> -> U) : U | Nil forall U","location":{"filename":"src/db/query_methods.cr","line_number":144,"url":"https://github.com/crystal-lang/crystal-db/blob/v0.13.1/src/db/query_methods.cr#L144"},"def":{"name":"query_one?","args":[{"name":"query","external_name":"query","restriction":""},{"name":"args_","external_name":"args_","restriction":""},{"name":"args","default_value":"nil","external_name":"args","restriction":"Array | ::Nil"}],"splat_index":1,"yields":1,"block_arity":1,"block_arg":{"name":"block","external_name":"block","restriction":"(ResultSet -> U)"},"return_type":"U | ::Nil","visibility":"Public","body":"query(query, *args_, args: args) do |rs|\n  if rs.move_next\n  else\n    return nil\n  end\n  value = yield rs\n  if rs.move_next\n    raise(DB::Error.new(\"more than one row\"))\n  end\n  return value\nend"}},{"html_id":"query_one?(query,*args_,args:Array|Nil=nil,astypes:Tuple)-instance-method","name":"query_one?","doc":"Executes a *query* that expects a single row and returns it\nas a tuple of the given *types*.\n\nReturns `nil` if there were no rows.\n\nRaises `DB::Error` if there were more than one row.\n\n```\nresult = db.query_one? \"select name, age from contacts where id = ?\", 1, as: {String, Int32}\ntypeof(result) # => Tuple(String, Int32) | Nil\n```","summary":"<p>Executes a <em>query</em> that expects a single row and returns it as a tuple of the given <em>types</em>.</p>","abstract":false,"args":[{"name":"query","external_name":"query","restriction":""},{"name":"args_","external_name":"args_","restriction":""},{"name":"args","default_value":"nil","external_name":"args","restriction":"Array | ::Nil"},{"name":"types","external_name":"as","restriction":"Tuple"}],"args_string":"(query, *args_, args : Array | Nil = nil, as types : Tuple)","args_html":"(query, *args_, args : Array | Nil = <span class=\"n\">nil</span>, as types : 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