shard-crystal-db/api/0.10.1/index.json

{"repository_name":"db","body":"[![Build Status](https://travis-ci.org/crystal-lang/crystal-db.svg?branch=master)](https://travis-ci.org/crystal-lang/crystal-db)\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* [Cassandra](https://github.com/kaukas/crystal-cassandra)\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](http://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- [ ] 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,"superclass":null,"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,"aliased":null,"aliased_html":null,"const":false,"constants":[],"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"}],"subclasses":[],"including_types":[],"namespace":null,"doc":null,"summary":null,"class_methods":[],"constructors":[],"instance_methods":[],"macros":[],"types":[{"html_id":"db/DB","path":"DB.html","kind":"module","full_name":"DB","name":"DB","abstract":false,"superclass":null,"ancestors":[],"locations":[{"filename":"src/db.cr","line_number":78,"url":"https://github.com/crystal-lang/crystal-db/blob/v0.10.1/src/db.cr#L78"},{"filename":"src/db/begin_transaction.cr","line_number":1,"url":"https://github.com/crystal-lang/crystal-db/blob/v0.10.1/src/db/begin_transaction.cr#L1"},{"filename":"src/db/connection.cr","line_number":1,"url":"https://github.com/crystal-lang/crystal-db/blob/v0.10.1/src/db/connection.cr#L1"},{"filename":"src/db/connection_context.cr","line_number":1,"url":"https://github.com/crystal-lang/crystal-db/blob/v0.10.1/src/db/connection_context.cr#L1"},{"filename":"src/db/database.cr","line_number":4,"url":"https://github.com/crystal-lang/crystal-db/blob/v0.10.1/src/db/database.cr#L4"},{"filename":"src/db/disposable.cr","line_number":1,"url":"https://github.com/crystal-lang/crystal-db/blob/v0.10.1/src/db/disposable.cr#L1"},{"filename":"src/db/driver.cr","line_number":1,"url":"https://github.com/crystal-lang/crystal-db/blob/v0.10.1/src/db/driver.cr#L1"},{"filename":"src/db/enumerable_concat.cr","line_number":1,"url":"https://github.com/crystal-lang/crystal-db/blob/v0.10.1/src/db/enumerable_concat.cr#L1"},{"filename":"src/db/error.cr","line_number":1,"url":"https://github.com/crystal-lang/crystal-db/blob/v0.10.1/src/db/error.cr#L1"},{"filename":"src/db/mapping.cr","line_number":1,"url":"https://github.com/crystal-lang/crystal-db/blob/v0.10.1/src/db/mapping.cr#L1"},{"filename":"src/db/pool.cr","line_number":5,"url":"https://github.com/crystal-lang/crystal-db/blob/v0.10.1/src/db/pool.cr#L5"},{"filename":"src/db/pool_prepared_statement.cr","line_number":1,"url":"https://github.com/crystal-lang/crystal-db/blob/v0.10.1/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/v0.10.1/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/v0.10.1/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/v0.10.1/src/db/query_methods.cr#L1"},{"filename":"src/db/result_set.cr","line_number":1,"url":"https://github.com/crystal-lang/crystal-db/blob/v0.10.1/src/db/result_set.cr#L1"},{"filename":"src/db/serializable.cr","line_number":1,"url":"https://github.com/crystal-lang/crystal-db/blob/v0.10.1/src/db/serializable.cr#L1"},{"filename":"src/db/session_methods.cr","line_number":1,"url":"https://github.com/crystal-lang/crystal-db/blob/v0.10.1/src/db/session_methods.cr#L1"},{"filename":"src/db/statement.cr","line_number":1,"url":"https://github.com/crystal-lang/crystal-db/blob/v0.10.1/src/db/statement.cr#L1"},{"filename":"src/db/string_key_cache.cr","line_number":1,"url":"https://github.com/crystal-lang/crystal-db/blob/v0.10.1/src/db/string_key_cache.cr#L1"},{"filename":"src/db/transaction.cr","line_number":1,"url":"https://github.com/crystal-lang/crystal-db/blob/v0.10.1/src/db/transaction.cr#L1"},{"filename":"src/db/version.cr","line_number":1,"url":"https://github.com/crystal-lang/crystal-db/blob/v0.10.1/src/db/version.cr#L1"},{"filename":"src/spec.cr","line_number":9,"url":"https://github.com/crystal-lang/crystal-db/blob/v0.10.1/src/spec.cr#L9"}],"repository_name":"db","program":false,"enum":false,"alias":false,"aliased":null,"aliased_html":null,"const":false,"constants":[{"id":"Log","name":"Log","value":"::Log.for(self)","doc":null,"summary":null},{"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":"\"0.10.1\"","doc":null,"summary":null}],"included_modules":[],"extended_modules":[],"subclasses":[],"including_types":[],"namespace":null,"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","summary":"<p>The DB module is a unified interface for database access.</p>","class_methods":[{"id":"connect(uri:URI|String)-class-method","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","doc":null,"default_value":"","external_name":"uri","restriction":"URI | String"}],"args_string":"(uri : URI | String)","args_html":"(uri : URI | String)","location":{"filename":"src/db.cr","line_number":136,"url":"https://github.com/crystal-lang/crystal-db/blob/v0.10.1/src/db.cr#L136"},"def":{"name":"connect","args":[{"name":"uri","doc":null,"default_value":"","external_name":"uri","restriction":"URI | String"}],"double_splat":null,"splat_index":null,"yields":null,"block_arg":null,"return_type":"","visibility":"Public","body":"build_connection(uri)"}},{"id":"connect(uri:URI|String,&)-class-method","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","doc":null,"default_value":"","external_name":"uri","restriction":"URI | String"}],"args_string":"(uri : URI | String, &)","args_html":"(uri : URI | String, &)","location":{"filename":"src/db.cr","line_number":141,"url":"https://github.com/crystal-lang/crystal-db/blob/v0.10.1/src/db.cr#L141"},"def":{"name":"connect","args":[{"name":"uri","doc":null,"default_value":"","external_name":"uri","restriction":"URI | String"}],"double_splat":null,"splat_index":null,"yields":1,"block_arg":null,"return_type":"","visibility":"Public","body":"cnn = build_connection(uri)\nbegin\n  yield cnn\nensure\n  cnn.close\nend\n"}},{"id":"open(uri:URI|String)-class-method","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","doc":null,"default_value":"","external_name":"uri","restriction":"URI | String"}],"args_string":"(uri : URI | String)","args_html":"(uri : URI | String)","location":{"filename":"src/db.cr","line_number":118,"url":"https://github.com/crystal-lang/crystal-db/blob/v0.10.1/src/db.cr#L118"},"def":{"name":"open","args":[{"name":"uri","doc":null,"default_value":"","external_name":"uri","restriction":"URI | String"}],"double_splat":null,"splat_index":null,"yields":null,"block_arg":null,"return_type":"","visibility":"Public","body":"build_database(uri)"}},{"id":"open(uri:URI|String,&)-class-method","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(uri:URI%7CString)-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","doc":null,"default_value":"","external_name":"uri","restriction":"URI | String"}],"args_string":"(uri : URI | String, &)","args_html":"(uri : URI | String, &)","location":{"filename":"src/db.cr","line_number":123,"url":"https://github.com/crystal-lang/crystal-db/blob/v0.10.1/src/db.cr#L123"},"def":{"name":"open","args":[{"name":"uri","doc":null,"default_value":"","external_name":"uri","restriction":"URI | String"}],"double_splat":null,"splat_index":null,"yields":1,"block_arg":null,"return_type":"","visibility":"Public","body":"db = build_database(uri)\nbegin\n  yield db\nensure\n  db.close\nend\n"}},{"id":"register_driver(driver_name,driver_class:Driver.class)-class-method","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","doc":null,"default_value":"","external_name":"driver_name","restriction":""},{"name":"driver_class","doc":null,"default_value":"","external_name":"driver_class","restriction":"Driver.class"}],"args_string":"(driver_name, driver_class : <span class=\"t\">Driver</span>.<span class=\"k\">class</span>)","args_html":"(driver_name, driver_class : <span class=\"t\">Driver</span>.<span class=\"k\">class</span>)","location":{"filename":"src/db.cr","line_number":102,"url":"https://github.com/crystal-lang/crystal-db/blob/v0.10.1/src/db.cr#L102"},"def":{"name":"register_driver","args":[{"name":"driver_name","doc":null,"default_value":"","external_name":"driver_name","restriction":""},{"name":"driver_class","doc":null,"default_value":"","external_name":"driver_class","restriction":"Driver.class"}],"double_splat":null,"splat_index":null,"yields":null,"block_arg":null,"return_type":"","visibility":"Public","body":"drivers[driver_name] = driver_class"}}],"constructors":[],"instance_methods":[],"macros":[{"id":"mapping(properties,strict=true)-macro","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(**properties)-macro\">DB.mapping</a></code> macro defines how an object is built from a <code><a href=\"DB/ResultSet.html\">ResultSet</a></code>.</p>","abstract":false,"args":[{"name":"properties","doc":null,"default_value":"","external_name":"properties","restriction":""},{"name":"strict","doc":null,"default_value":"true","external_name":"strict","restriction":""}],"args_string":"(properties, strict = <span class=\"n\">true</span>)","location":{"filename":"src/db/mapping.cr","line_number":60,"url":"https://github.com/crystal-lang/crystal-db/blob/v0.10.1/src/db/mapping.cr#L60"},"def":{"name":"mapping","args":[{"name":"properties","doc":null,"default_value":"","external_name":"properties","restriction":""},{"name":"strict","doc":null,"default_value":"true","external_name":"strict","restriction":""}],"double_splat":null,"splat_index":null,"block_arg":null,"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}\")\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 }}\")\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  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ends</p>","abstract":false,"args":[],"args_string":"(&)","args_html":"(&)","location":{"filename":"src/db/database.cr","line_number":121,"url":"https://github.com/crystal-lang/crystal-db/blob/v0.10.1/src/db/database.cr#L121"},"def":{"name":"using_connection","args":[],"double_splat":null,"splat_index":null,"yields":1,"block_arg":null,"return_type":"","visibility":"Public","body":"connection = self.checkout\nbegin\n  yield connection\nensure\n  connection.release\nend\n"}}],"macros":[],"types":[]},{"html_id":"db/DB/Disposable","path":"DB/Disposable.html","kind":"module","full_name":"DB::Disposable","name":"Disposable","abstract":false,"superclass":null,"ancestors":[],"locations":[{"filename":"src/db/disposable.cr","line_number":3,"url":"https://github.com/crystal-lang/crystal-db/blob/v0.10.1/src/db/disposable.cr#L3"}],"repository_name":"db","program":false,"enum":false,"alias":false,"aliased":null,"aliased_html":null,"const":false,"constants":[],"included_modules":[],"extended_modules":[],"subclasses":[],"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/StatementMethods","kind":"module","full_name":"DB::StatementMethods","name":"StatementMethods"},{"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>","class_methods":[],"constructors":[],"instance_methods":[{"id":"close-instance-method","html_id":"close-instance-method","name":"close","doc":"Closes this object.","summary":"<p>Closes this object.</p>","abstract":false,"args":[],"args_string":"","args_html":"","location":{"filename":"src/db/disposable.cr","line_number":9,"url":"https://github.com/crystal-lang/crystal-db/blob/v0.10.1/src/db/disposable.cr#L9"},"def":{"name":"close","args":[],"double_splat":null,"splat_index":null,"yields":null,"block_arg":null,"return_type":"","visibility":"Public","body":"if @closed\n  return\nend\ndo_close\n@closed = true\n"}},{"id":"closed?-instance-method","html_id":"closed?-instance-method","name":"closed?","doc":"Returns `true` if this object is closed. 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How to connect to database\n  connection_string \"scheme://database_url\"\n\n  # Clean up database if needed using before/after callbacks\n  before do\n    # ...\n  end\n\n  after do\n    # ...\n  end\n\n  # Sample values that will be stored, retrieved across many specs\n  sample_value \"hello\", \"varchar(25)\", \"'hello'\"\n\n  it \"custom spec with a db initialized\" do |db|\n    # assert something using *db*\n  end\n\n  # Configure the appropiate syntax for different commands needed to run the specs\n  binding_syntax do |index|\n    \"?\"\n  end\n\n  create_table_1column_syntax do |table_name, col1|\n    \"create table #{table_name} (#{col1.name} #{col1.sql_type} #{col1.null ? \"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":[{"id":"run(description=&quot;asadb&quot;,&)-class-method","html_id":"run(description=&quot;asadb&quot;,&)-class-method","name":"run","doc":null,"summary":null,"abstract":false,"args":[{"name":"description","doc":null,"default_value":"\"as a db\"","external_name":"description","restriction":""}],"args_string":"(description = <span class=\"s\">&quot;as a db&quot;</span>, &)","args_html":"(description = <span class=\"s\">&quot;as a db&quot;</span>, &)","location":{"filename":"src/spec.cr","line_number":468,"url":"https://github.com/crystal-lang/crystal-db/blob/v0.10.1/src/spec.cr#L468"},"def":{"name":"run","args":[{"name":"description","doc":null,"default_value":"\"as a db\"","external_name":"description","restriction":""}],"double_splat":null,"splat_index":null,"yields":1,"block_arg":null,"return_type":"","visibility":"Public","body":"ctx = self.new\nwith ctx yield\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        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    else\n      raise(\"Invalid prepared value. 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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":[{"id":"arg_to_log(arg:Enumerable):::Log::Metadata::Value-class-method","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","doc":null,"default_value":"","external_name":"arg","restriction":"Enumerable"}],"args_string":"(arg : Enumerable) : ::Log::Metadata::Value","args_html":"(arg : Enumerable) : 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= <span class=\"n\">1</span>, max_pool_size = <span class=\"n\">0</span>, max_idle_pool_size = <span class=\"n\">1</span>, checkout_timeout = <span class=\"n\">5.0</span>, retry_attempts = <span class=\"n\">1</span>, retry_delay = <span class=\"n\">0.2</span>, &factory :  -> T)","args_html":"(initial_pool_size = <span class=\"n\">1</span>, max_pool_size = <span class=\"n\">0</span>, max_idle_pool_size = <span class=\"n\">1</span>, checkout_timeout = <span class=\"n\">5.0</span>, retry_attempts = <span class=\"n\">1</span>, retry_delay = <span class=\"n\">0.2</span>, &factory :  -> 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T)"},"return_type":"","visibility":"Public","body":"_ = Pool(T).allocate\n_.initialize(initial_pool_size, max_pool_size, max_idle_pool_size, checkout_timeout, retry_attempts, retry_delay, &factory) do\n  yield\nend\nif _.responds_to?(:finalize)\n  ::GC.add_finalizer(_)\nend\n_\n"}}],"instance_methods":[{"id":"checkout:T-instance-method","html_id":"checkout:T-instance-method","name":"checkout","doc":null,"summary":null,"abstract":false,"args":[],"args_string":" : T","args_html":" : T","location":{"filename":"src/db/pool.cr","line_number":73,"url":"https://github.com/crystal-lang/crystal-db/blob/v0.10.1/src/db/pool.cr#L73"},"def":{"name":"checkout","args":[],"double_splat":null,"splat_index":null,"yields":null,"block_arg":null,"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        r = unsync do\n          build_resource\n        end\n        @inflight = @inflight - 1\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 res.responds_to?(:before_checkout)\n  res.before_checkout\nend\nres\n"}},{"id":"checkout(&block:T->)-instance-method","html_id":"checkout(&block:T->)-instance-method","name":"checkout","doc":null,"summary":null,"abstract":false,"args":[],"args_string":"(&block : T -> )","args_html":"(&block : T -> )","location":{"filename":"src/db/pool.cr","line_number":109,"url":"https://github.com/crystal-lang/crystal-db/blob/v0.10.1/src/db/pool.cr#L109"},"def":{"name":"checkout","args":[],"double_splat":null,"splat_index":null,"yields":1,"block_arg":{"name":"block","doc":null,"default_value":"","external_name":"block","restriction":"(T -> )"},"return_type":"","visibility":"Public","body":"connection = checkout\nbegin\n  yield connection\nensure\n  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= <span class=\"n\">nil</span>, as types : Tuple)","args_html":"(query, *args_, args : Array? = <span class=\"n\">nil</span>, as types : Tuple)","location":{"filename":"src/db/query_methods.cr","line_number":226,"url":"https://github.com/crystal-lang/crystal-db/blob/v0.10.1/src/db/query_methods.cr#L226"},"def":{"name":"query_all","args":[{"name":"query","doc":null,"default_value":"","external_name":"query","restriction":""},{"name":"args_","doc":null,"default_value":"","external_name":"args_","restriction":""},{"name":"args","doc":null,"default_value":"nil","external_name":"args","restriction":"Array | ::Nil"},{"name":"types","doc":null,"default_value":"","external_name":"as","restriction":"Tuple"}],"double_splat":null,"splat_index":1,"yields":null,"block_arg":null,"return_type":"","visibility":"Public","body":"query_all(query, *args_, args: args) do |rs|\n  rs.read(*types)\nend"}},{"id":"query_each(query,*args_,args:Array?=nil,&)-instance-method","html_id":"query_each(query,*args_,args:Array?=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","doc":null,"default_value":"","external_name":"query","restriction":""},{"name":"args_","doc":null,"default_value":"","external_name":"args_","restriction":""},{"name":"args","doc":null,"default_value":"nil","external_name":"args","restriction":"Array | ::Nil"}],"args_string":"(query, *args_, args : Array? 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= <span class=\"n\">nil</span>, &block : ResultSet -> U) : U forall U","args_html":"(query, *args_, args : Array? = <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/v0.10.1/src/db/query_methods.cr#L76"},"def":{"name":"query_one","args":[{"name":"query","doc":null,"default_value":"","external_name":"query","restriction":""},{"name":"args_","doc":null,"default_value":"","external_name":"args_","restriction":""},{"name":"args","doc":null,"default_value":"nil","external_name":"args","restriction":"Array | ::Nil"}],"double_splat":null,"splat_index":1,"yields":1,"block_arg":{"name":"block","doc":null,"default_value":"","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"}},{"id":"query_one(query,*args_,args:Array?=nil,astypes:Tuple)-instance-method","html_id":"query_one(query,*args_,args:Array?=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","doc":null,"default_value":"","external_name":"query","restriction":""},{"name":"args_","doc":null,"default_value":"","external_name":"args_","restriction":""},{"name":"args","doc":null,"default_value":"nil","external_name":"args","restriction":"Array | ::Nil"},{"name":"types","doc":null,"default_value":"","external_name":"as","restriction":"Tuple"}],"args_string":"(query, *args_, args : Array? = <span class=\"n\">nil</span>, as types : Tuple)","args_html":"(query, *args_, args : Array? = <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/v0.10.1/src/db/query_methods.cr#L95"},"def":{"name":"query_one","args":[{"name":"query","doc":null,"default_value":"","external_name":"query","restriction":""},{"name":"args_","doc":null,"default_value":"","external_name":"args_","restriction":""},{"name":"args","doc":null,"default_value":"nil","external_name":"args","restriction":"Array | ::Nil"},{"name":"types","doc":null,"default_value":"","external_name":"as","restriction":"Tuple"}],"double_splat":null,"splat_index":1,"yields":null,"block_arg":null,"return_type":"","visibility":"Public","body":"query_one(query, *args_, args: args) do |rs|\n  rs.read(*types)\nend"}},{"id":"query_one(query,*args_,args:Array?=nil,astypes:NamedTuple)-instance-method","html_id":"query_one(query,*args_,args:Array?=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","doc":null,"default_value":"","external_name":"query","restriction":""},{"name":"args_","doc":null,"default_value":"","external_name":"args_","restriction":""},{"name":"args","doc":null,"default_value":"nil","external_name":"args","restriction":"Array | ::Nil"},{"name":"types","doc":null,"default_value":"","external_name":"as","restriction":"NamedTuple"}],"args_string":"(query, *args_, args : Array? 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\"select name from contacts where id = ?\", 1, as: String\ntypeof(name) # => 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","doc":null,"default_value":"","external_name":"query","restriction":""},{"name":"args_","doc":null,"default_value":"","external_name":"args_","restriction":""},{"name":"args","doc":null,"default_value":"nil","external_name":"args","restriction":"Array | ::Nil"},{"name":"type","doc":null,"default_value":"","external_name":"as","restriction":"Class"}],"args_string":"(query, *args_, args : Array? = <span class=\"n\">nil</span>, as type : Class)","args_html":"(query, *args_, args : Array? = <span class=\"n\">nil</span>, as type : Class)","location":{"filename":"src/db/query_methods.cr","line_number":200,"url":"https://github.com/crystal-lang/crystal-db/blob/v0.10.1/src/db/query_methods.cr#L200"},"def":{"name":"query_one?","args":[{"name":"query","doc":null,"default_value":"","external_name":"query","restriction":""},{"name":"args_","doc":null,"default_value":"","external_name":"args_","restriction":""},{"name":"args","doc":null,"default_value":"nil","external_name":"args","restriction":"Array | ::Nil"},{"name":"type","doc":null,"default_value":"","external_name":"as","restriction":"Class"}],"double_splat":null,"splat_index":1,"yields":null,"block_arg":null,"return_type":"","visibility":"Public","body":"query_one?(query, *args_, args: args) do |rs|\n  rs.read(type)\nend"}},{"id":"query_one?(query,*args_,args:Array?=nil,astypes:NamedTuple)-instance-method","html_id":"query_one?(query,*args_,args:Array?=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\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: {age: String, name: Int32}\ntypeof(result) # => NamedTuple(age: String, name: Int32) | Nil\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","doc":null,"default_value":"","external_name":"query","restriction":""},{"name":"args_","doc":null,"default_value":"","external_name":"args_","restriction":""},{"name":"args","doc":null,"default_value":"nil","external_name":"args","restriction":"Array | ::Nil"},{"name":"types","doc":null,"default_value":"","external_name":"as","restriction":"NamedTuple"}],"args_string":"(query, *args_, args : Array? = <span class=\"n\">nil</span>, as types : NamedTuple)","args_html":"(query, *args_, args : Array? = <span class=\"n\">nil</span>, as types : NamedTuple)","location":{"filename":"src/db/query_methods.cr","line_number":183,"url":"https://github.com/crystal-lang/crystal-db/blob/v0.10.1/src/db/query_methods.cr#L183"},"def":{"name":"query_one?","args":[{"name":"query","doc":null,"default_value":"","external_name":"query","restriction":""},{"name":"args_","doc":null,"default_value":"","external_name":"args_","restriction":""},{"name":"args","doc":null,"default_value":"nil","external_name":"args","restriction":"Array | ::Nil"},{"name":"types","doc":null,"default_value":"","external_name":"as","restriction":"NamedTuple"}],"double_splat":null,"splat_index":1,"yields":null,"block_arg":null,"return_type":"","visibility":"Public","body":"query_one?(query, *args_, args: args) do |rs|\n  rs.read(**types)\nend"}},{"id":"query_one?(query,*args_,args:Array?=nil,astypes:Tuple)-instance-method","html_id":"query_one?(query,*args_,args:Array?=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","doc":null,"default_value":"","external_name":"query","restriction":""},{"name":"args_","doc":null,"default_value":"","external_name":"args_","restriction":""},{"name":"args","doc":null,"default_value":"nil","external_name":"args","restriction":"Array | ::Nil"},{"name":"types","doc":null,"default_value":"","external_name":"as","restriction":"Tuple"}],"args_string":"(query, *args_, args : Array? = <span class=\"n\">nil</span>, as types : Tuple)","args_html":"(query, *args_, args : Array? = <span class=\"n\">nil</span>, as types : Tuple)","location":{"filename":"src/db/query_methods.cr","line_number":165,"url":"https://github.com/crystal-lang/crystal-db/blob/v0.10.1/src/db/query_methods.cr#L165"},"def":{"name":"query_one?","args":[{"name":"query","doc":null,"default_value":"","external_name":"query","restriction":""},{"name":"args_","doc":null,"default_value":"","external_name":"args_","restriction":""},{"name":"args","doc":null,"default_value":"nil","external_name":"args","restriction":"Array | ::Nil"},{"name":"types","doc":null,"default_value":"","external_name":"as","restriction":"Tuple"}],"double_splat":null,"splat_index":1,"yields":null,"block_arg":null,"return_type":"","visibility":"Public","body":"query_one?(query, *args_, args: args) do |rs|\n  rs.read(*types)\nend"}},{"id":"query_one?(query,*args_,args:Array?=nil,&block:ResultSet->U):U?forallU-instance-method","html_id":"query_one?(query,*args_,args:Array?=nil,&block:ResultSet->U):U?forallU-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","doc":null,"default_value":"","external_name":"query","restriction":""},{"name":"args_","doc":null,"default_value":"","external_name":"args_","restriction":""},{"name":"args","doc":null,"default_value":"nil","external_name":"args","restriction":"Array | ::Nil"}],"args_string":"(query, *args_, args : Array? = <span class=\"n\">nil</span>, &block : ResultSet -> U) : U? forall U","args_html":"(query, *args_, args : Array? = <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":144,"url":"https://github.com/crystal-lang/crystal-db/blob/v0.10.1/src/db/query_methods.cr#L144"},"def":{"name":"query_one?","args":[{"name":"query","doc":null,"default_value":"","external_name":"query","restriction":""},{"name":"args_","doc":null,"default_value":"","external_name":"args_","restriction":""},{"name":"args","doc":null,"default_value":"nil","external_name":"args","restriction":"Array | ::Nil"}],"double_splat":null,"splat_index":1,"yields":1,"block_arg":{"name":"block","doc":null,"default_value":"","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"}},{"id":"scalar(query,*args_,args:Array?=nil)-instance-method","html_id":"scalar(query,*args_,args:Array?=nil)-instance-method","name":"scalar","doc":"Performs the `query` and returns a single scalar value\n\n```\nputs db.scalar(\"SELECT MAX(name)\").as(String) # => (a String)\n```","summary":"<p>Performs the <code><a href=\"../DB/QueryMethods.html#query(query,*args_,args:Array?=nil)-instance-method\">#query</a></code> and returns a single scalar value</p>","abstract":false,"args":[{"name":"query","doc":null,"default_value":"","external_name":"query","restriction":""},{"name":"args_","doc":null,"default_value":"","external_name":"args_","restriction":""},{"name":"args","doc":null,"default_value":"nil","external_name":"args","restriction":"Array | ::Nil"}],"args_string":"(query, *args_, args : Array? = <span class=\"n\">nil</span>)","args_html":"(query, *args_, args : Array? = <span class=\"n\">nil</span>)","location":{"filename":"src/db/query_methods.cr","line_number":283,"url":"https://github.com/crystal-lang/crystal-db/blob/v0.10.1/src/db/query_methods.cr#L283"},"def":{"name":"scalar","args":[{"name":"query","doc":null,"default_value":"","external_name":"query","restriction":""},{"name":"args_","doc":null,"default_value":"","external_name":"args_","restriction":""},{"name":"args","doc":null,"default_value":"nil","external_name":"args","restriction":"Array | ::Nil"}],"double_splat":null,"splat_index":1,"yields":null,"block_arg":null,"return_type":"","visibility":"Public","body":"(build(query)).scalar(*args_, args: args)"}}],"macros":[],"types":[]},{"html_id":"db/DB/ResultSet","path":"DB/ResultSet.html","kind":"class","full_name":"DB::ResultSet","name":"ResultSet","abstract":true,"superclass":{"html_id":"db/Reference","kind":"class","full_name":"Reference","name":"Reference"},"ancestors":[{"html_id":"db/DB/Disposable","kind":"module","full_name":"DB::Disposable","name":"Disposable"},{"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/result_set.cr","line_number":22,"url":"https://github.com/crystal-lang/crystal-db/blob/v0.10.1/src/db/result_set.cr#L22"}],"repository_name":"db","program":false,"enum":false,"alias":false,"aliased":null,"aliased_html":null,"const":false,"constants":[],"included_modules":[{"html_id":"db/DB/Disposable","kind":"module","full_name":"DB::Disposable","name":"Disposable"}],"extended_modules":[],"subclasses":[],"including_types":[],"namespace":{"html_id":"db/DB","kind":"module","full_name":"DB","name":"DB"},"doc":"The response of a query performed on a `Database`.\n\nSee `DB` for a complete sample.\n\nEach `#read` call consumes the result and moves to the next column.\nEach column must be read in order.\nAt any moment a `#move_next` can be invoked, meaning to skip the\nremaining, or even all the columns, in the current row.\nAlso it is not mandatory to consume the whole `ResultSet`, hence an iteration\nthrough `#each` or `#move_next` can be stopped.\n\n**Note:** depending on how the `ResultSet` was obtained it might be mandatory an\nexplicit call to `#close`. Check `QueryMethods#query`.\n\n### Note to implementors\n\n1. Override `#move_next` to move to the next row.\n2. Override `#read` returning the next value in the row.\n3. (Optional) Override `#read(t)` for some types `t` for which custom logic other than a simple cast is needed.\n4. Override `#column_count`, `#column_name`.","summary":"<p>The response of a query performed on a <code><a href=\"../DB/Database.html\">Database</a></code>.</p>","class_methods":[],"constructors":[{"id":"new(statement:DB::Statement)-class-method","html_id":"new(statement:DB::Statement)-class-method","name":"new","doc":null,"summary":null,"abstract":false,"args":[{"name":"statement","doc":null,"default_value":"","external_name":"statement","restriction":"DB::Statement"}],"args_string":"(statement : DB::Statement)","args_html":"(statement : <a href=\"../DB/Statement.html\">DB::Statement</a>)","location":{"filename":"src/db/result_set.cr","line_number":28,"url":"https://github.com/crystal-lang/crystal-db/blob/v0.10.1/src/db/result_set.cr#L28"},"def":{"name":"new","args":[{"name":"statement","doc":null,"default_value":"","external_name":"statement","restriction":"DB::Statement"}],"double_splat":null,"splat_index":null,"yields":null,"block_arg":null,"return_type":"","visibility":"Public","body":"_ = allocate\n_.initialize(statement)\nif _.responds_to?(:finalize)\n  ::GC.add_finalizer(_)\nend\n_\n"}}],"instance_methods":[{"id":"column_count:Int32-instance-method","html_id":"column_count:Int32-instance-method","name":"column_count","doc":"Returns the number of columns in the result","summary":"<p>Returns the number of columns in the result</p>","abstract":true,"args":[],"args_string":" : Int32","args_html":" : 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