shard-crystal-db/api/0.5.1/search-index.js

crystal_doc_search_index_callback({"repository_name":"github.com/crystal-lang/crystal-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* [postgres](https://github.com/will/crystal-pg)\n\n## Installation\n\nAdd this to your application's `shard.yml`:\n\n```yaml\ndependencies:\n  db:\n    github: crystal-lang/crystal-db\n```\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\nSince this is an abstract db api, it's usage is through a concrete database driver.\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\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- [ ] 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":"github.com/crystal-lang/crystal-db/toplevel","path":"toplevel.html","kind":"module","full_name":"Top Level Namespace","name":"Top Level 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iased":"","const":false,"constants":[{"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":"\"0.5.1\"","doc":null,"summary":null}],"included_modules":[],"extended_modules":[],"subclasses":[],"including_types":[],"namespace":null,"doc":"The DB module is a unified interface to database access.\nDatabase dialects is supported by custom database driver shards.\nCheck [crystal-lang/crystal-sqlite3](https://github.com/crystal-lang/crystal-sqlite3) for example.\n\nDrivers implementors check `Driver` class.\n\nDB manage a connection pool. The connection pool can be configured by `URI` query. See `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\n```\nrequire \"db\"\nrequire \"sqlite3\"\n\nDB.open \"sqlite3:./file.db\" do |db|\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\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 to 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)","source_link":"https://github.com/crystal-lang/crystal-db/blob/2b7892eb3ab31908de4e88cc1c896da69f0d9ba9/src/db.cr#L120","source_link":"https://github.com/crystal-lang/crystal-db/blob/2b7892eb3ab31908de4e88cc1c896da69f0d9ba9/src/db.cr#L120","def":{"name":"connect","args":[{"name":"uri","doc":null,"default_value":"","external_name":"uri","restriction":"URI | 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&block)","source_link":"https://github.com/crystal-lang/crystal-db/blob/2b7892eb3ab31908de4e88cc1c896da69f0d9ba9/src/db.cr#L125","source_link":"https://github.com/crystal-lang/crystal-db/blob/2b7892eb3ab31908de4e88cc1c896da69f0d9ba9/src/db.cr#L125","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":"Opens a database using the specified *uri*.\nThe scheme of the *uri* determines the driver to use.\nReturned database must be closed by `Database#close`.\nIf a block is used the database is yielded and closed automatically.","summary":"<p>Opens a database 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)","source_link":"https://github.com/crystal-lang/crystal-db/blob/2b7892eb3ab31908de4e88cc1c896da69f0d9ba9/src/db.cr#L102","source_link":"https://github.com/crystal-lang/crystal-db/blob/2b7892eb3ab31908de4e88cc1c896da69f0d9ba9/src/db.cr#L102","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,&block)-class-method","html_id":"open(uri:URI|String,&amp;block)-class-method","name":"open","doc":"Same as `#open` but the database is yielded and closed automatically.","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.</p>","abstract":false,"args":[{"name":"uri","doc":null,"default_value":"","external_name":"uri","restriction":"URI | String"}],"args_string":"(uri : URI | String, &block)","source_link":"https://github.com/crystal-lang/crystal-db/blob/2b7892eb3ab31908de4e88cc1c896da69f0d9ba9/src/db.cr#L107","source_link":"https://github.com/crystal-lang/crystal-db/blob/2b7892eb3ab31908de4e88cc1c896da69f0d9ba9/src/db.cr#L107","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 : Driver.class)","source_link":"https://github.com/crystal-lang/crystal-db/blob/2b7892eb3ab31908de4e88cc1c896da69f0d9ba9/src/db.cr#L90","source_link":"https://github.com/crystal-lang/crystal-db/blob/2b7892eb3ab31908de4e88cc1c896da69f0d9ba9/src/db.cr#L90","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 DB::ResultSet.\n\nIt takes hash literal as argument, in which attributes and types are defined.\nOnce defined, `DB::ResultSet#read(t)` populates properties of the class from the\nresult set.\n\n```crystal\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::Exception`.\n\nYou can also define attributes for each property.\n\n```crystal\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 reusltset. 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 `DB::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-macro\">DB.mapping</a></code> macro defines how an object is built from a DB::ResultSet.</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 = true)","source_link":"https://github.com/crystal-lang/crystal-db/blob/2b7892eb3ab31908de4e88cc1c896da69f0d9ba9/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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href=\"../DB/BeginTransaction.html#transaction%28%26block%29-instance-method\">BeginTransaction#transaction</a></code> for documentation.</p>","abstract":false,"args":[],"args_string":"(&block)","source_link":"https://github.com/crystal-lang/crystal-db/blob/2b7892eb3ab31908de4e88cc1c896da69f0d9ba9/src/db/database.cr#L125","source_link":"https://github.com/crystal-lang/crystal-db/blob/2b7892eb3ab31908de4e88cc1c896da69f0d9ba9/src/db/database.cr#L125","def":{"name":"transaction","args":[],"double_splat":null,"splat_index":null,"yields":1,"block_arg":null,"return_type":"","visibility":"Public","body":"using_connection do |cnn|\n  cnn.transaction do |tx|\n    yield tx\n  end\nend"}},{"id":"uri:URI-instance-method","html_id":"uri:URI-instance-method","name":"uri","doc":"Returns the uri with the connection settings to the database","summary":"<p>Returns the uri with the connection settings to the database</p>","abstract":false,"args":[],"args_string":" : URI","source_link":"https://github.com/crystal-lang/crystal-db/blob/2b7892eb3ab31908de4e88cc1c896da69f0d9ba9/src/db/database.cr#L34","source_link":"https://github.com/crystal-lang/crystal-db/blob/2b7892eb3ab31908de4e88cc1c896da69f0d9ba9/src/db/database.cr#L34","def":{"name":"uri","args":[],"double_splat":null,"splat_index":null,"yields":null,"block_arg":null,"return_type":"","visibility":"Public","body":"@uri"}},{"id":"using_connection(&block)-instance-method","html_id":"using_connection(&amp;block)-instance-method","name":"using_connection","doc":"yields a connection from the pool\nthe connection is returned to the pool\nwhen the block ends","summary":"<p>yields a connection from the pool the connection is returned to the pool when the block 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connection.release\nend\n"}}],"macros":[],"types":[]},{"html_id":"github.com/crystal-lang/crystal-db/DB/Disposable","path":"DB/Disposable.html","kind":"module","full_name":"DB::Disposable","name":"Disposable","abstract":false,"superclass":null,"ancestors":[],"locations":[{"filename":"db/disposable.cr","line_number":3,"url":"https://github.com/crystal-lang/crystal-db/blob/2b7892eb3ab31908de4e88cc1c896da69f0d9ba9/src/db/disposable.cr"}],"repository_name":"github.com/crystal-lang/crystal-db","program":false,"enum":false,"alias":false,"aliased":"","const":false,"constants":[],"included_modules":[],"extended_modules":[],"subclasses":[],"including_types":[{"html_id":"github.com/crystal-lang/crystal-db/DB/Connection","kind":"class","full_name":"DB::Connection","name":"Connection"},{"html_id":"github.com/crystal-lang/crystal-db/DB/ResultSet","kind":"class","full_name":"DB::ResultSet","name":"ResultSet"},{"html_id":"github.com/crystal-lang/crystal-db/DB/StatementMethods","kind":"module","full_name":"DB::StatementMethods","name":"StatementMethods"},{"html_id":"github.com/crystal-lang/crystal-db/DB/Transaction","kind":"class","full_name":"DB::Transaction","name":"Transaction"}],"namespace":{"html_id":"github.com/crystal-lang/crystal-db/DB","kind":"module","full_name":"DB","name":"DB"},"doc":"Generic 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driver implementors must subclass `Driver`,\nregister with a driver_name using `DB#register_driver` and\noverride the factory method `#build_connection`.\n\n```\nrequire \"db\"\n\nclass FakeDriver < DB::Driver\n  def build_connection(context : DB::ConnectionContext)\n    FakeConnection.new context\n  end\nend\n\nDB.register_driver \"fake\", FakeDriver\n```\n\nAccess to this fake datbase 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.","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 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class to ensure behaviour of custom drivers\n\n```\nrequire \"db/spec\"\n\nDB::DriverSpecs(DB::Any).run do\n  # 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;,&block)-class-method","html_id":"run(description=&amp;quot;asadb&amp;quot;,&amp;block)-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>, 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Spec.matches?(description, file, line, end_line)\nelse\n  return\nend\n@its << (SpecIt.new(description, prepared, file, line, end_line, block))\n"}},{"id":"its-instance-method","html_id":"its-instance-method","name":"its","doc":null,"summary":null,"abstract":false,"args":[],"args_string":"","source_link":"https://github.com/crystal-lang/crystal-db/blob/2b7892eb3ab31908de4e88cc1c896da69f0d9ba9/src/spec.cr#L123","source_link":"https://github.com/crystal-lang/crystal-db/blob/2b7892eb3ab31908de4e88cc1c896da69f0d9ba9/src/spec.cr#L123","def":{"name":"its","args":[],"double_splat":null,"splat_index":null,"yields":null,"block_arg":null,"return_type":"","visibility":"Public","body":"@its"}},{"id":"sample_value(value,sql_type,value_encoded,*,type_safe_value=true)-instance-method","html_id":"sample_value(value,sql_type,value_encoded,*,type_safe_value=true)-instance-method","name":"sample_value","doc":"Use *value* as sample value that should be stored in columns of type 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(#{typeof(value)} | Nil)\", prepared: :both) do |db|\n  db.query(select_scalar(encode_null, nil)) do |rs|\n    assert_single_read(rs, typeof(value || nil), nil)\n  end\nend\nvalue_desc = value.to_s\nif value_desc.size > 25\n  value_desc = \"#{value_desc[0..25]}...(#{value_desc.size})\"\nend\nvalue_desc = \"#{value_desc} as #{sql_type}\"\nif type_safe_value\n  it(\"executes with bind #{value_desc}\") do |db|\n    (db.scalar(select_scalar(param(1), sql_type), value)).should(eq(value))\n  end\n  it(\"executes with bind #{value_desc} as array\") do |db|\n    (db.scalar(select_scalar(param(1), sql_type), [value])).should(eq(value))\n  end\n  it(\"select #{value_desc} as literal\") do |db|\n    (db.scalar(select_scalar(value_encoded, sql_type))).should(eq(value))\n    db.query(select_scalar(value_encoded, sql_type)) do |rs|\n      assert_single_read(rs, typeof(value), value)\n    end\n  end\nend\nit(\"insert/get value #{value_desc} from table\", prepared: :both) do |db|\n  db.exec(sql_create_table_table1(c1 = col1(sql_type)))\n  db.exec(sql_insert_table1(c1, value_encoded))\n  (db.query_one(sql_select_table1(c1), as: typeof(value))).should(eq(value))\nend\nit(\"insert/get value #{value_desc} from table as nillable\", prepared: :both) do |db|\n  db.exec(sql_create_table_table1(c1 = col1(sql_type)))\n  db.exec(sql_insert_table1(c1, value_encoded))\n  (db.query_one(sql_select_table1(c1), as: ::Union(typeof(value) | Nil))).should(eq(value))\nend\nit(\"insert/get value nil from table as nillable #{sql_type}\", prepared: :both) do |db|\n  db.exec(sql_create_table_table1(c1 = col1(sql_type, null: true)))\n  db.exec(sql_insert_table1(c1, encode_null))\n  (db.query_one(sql_select_table1(c1), as: ::Union(typeof(value) | Nil))).should(eq(nil))\nend\nit(\"insert/get value #{value_desc} from table with binding\") do |db|\n  db.exec(sql_create_table_table2(c1 = col1(sql_type_for(String)), c2 = col2(sql_type)))\n  db.exec(sql_insert_table2(c1, param(1), c2, param(2)), value_for(String), value)\n  (db.query_one(sql_select_table2(c2), as: typeof(value))).should(eq(value))\nend\nit(\"insert/get value #{value_desc} from table as nillable with binding\") do |db|\n  db.exec(sql_create_table_table2(c1 = col1(sql_type_for(String)), c2 = col2(sql_type)))\n  db.exec(sql_insert_table2(c1, param(1), c2, param(2)), value_for(String), value)\n  (db.query_one(sql_select_table2(c2), as: ::Union(typeof(value) | Nil))).should(eq(value))\nend\nit(\"insert/get value nil from table as nillable #{sql_type} with binding\") do |db|\n  db.exec(sql_create_table_table2(c1 = col1(sql_type_for(String)), c2 = col2(sql_type, null: true)))\n  db.exec(sql_insert_table2(c1, param(1), c2, param(2)), value_for(String), nil)\n  (db.query_one(sql_select_table2(c2), as: ::Union(typeof(value) | Nil))).should(eq(nil))\nend\nit(\"can use read(#{typeof(value)}) with DB::ResultSet\", prepared: :both) do |db|\n  db.exec(sql_create_table_table1(c1 = col1(sql_type)))\n  db.exec(sql_insert_table1(c1, value_encoded))\n  db.query(sql_select_table1(c1)) do |rs|\n    assert_single_read(rs.as(DB::ResultSet), typeof(value), value)\n  end\nend\nit(\"can use read(#{typeof(value)}?) with DB::ResultSet\", prepared: :both) do |db|\n  db.exec(sql_create_table_table1(c1 = col1(sql_type)))\n  db.exec(sql_insert_table1(c1, value_encoded))\n  db.query(sql_select_table1(c1)) do |rs|\n    assert_single_read(rs.as(DB::ResultSet), ::Union(typeof(value) | Nil), value)\n  end\nend\nit(\"can use read(#{typeof(value)}?) with DB::ResultSet for nil\", prepared: :both) do |db|\n  db.exec(sql_create_table_table1(c1 = col1(sql_type, null: true)))\n  db.exec(sql_insert_table1(c1, encode_null))\n  db.query(sql_select_table1(c1)) do |rs|\n    assert_single_read(rs.as(DB::ResultSet), ::Union(typeof(value) | Nil), nil)\n  end\nend\n"}},{"id":"select_1column_syntax(&select_1column_syntax:Proc(String,ColumnDef,String))-instance-method","html_id":"select_1column_syntax(&amp;select_1column_syntax:Proc(String,ColumnDef,String))-instance-method","name":"select_1column_syntax","doc":null,"summary":null,"abstract":false,"args":[],"args_string":"(&select_1column_syntax : Proc(String, ColumnDef, String))","source_link":"https://github.com/crystal-lang/crystal-db/blob/2b7892eb3ab31908de4e88cc1c896da69f0d9ba9/src/spec.cr#L116","source_link":"https://github.com/crystal-lang/crystal-db/blob/2b7892eb3ab31908de4e88cc1c896da69f0d9ba9/src/spec.cr#L116","def":{"name":"select_1column_syntax","args":[],"double_splat":null,"splat_index":null,"yields":0,"block_arg":{"name":"select_1column_syntax","doc":null,"default_value":"","external_name":"select_1column_syntax","restriction":"Proc(String, ColumnDef, String)"},"return_type":"","visibility":"Public","body":"@select_1column_syntax = select_1column_syntax"}},{"id":"select_2columns_syntax(&select_2columns_syntax:Proc(String,ColumnDef,ColumnDef,String))-instance-method","html_id":"select_2columns_syntax(&amp;select_2columns_syntax:Proc(String,ColumnDef,ColumnDef,String))-instance-method","name":"select_2columns_syntax","doc":null,"summary":null,"abstract":false,"args":[],"args_string":"(&select_2columns_syntax : Proc(String, ColumnDef, ColumnDef, String))","source_link":"https://github.com/crystal-lang/crystal-db/blob/2b7892eb3ab31908de4e88cc1c896da69f0d9ba9/src/spec.cr#L117","source_link":"https://github.com/crystal-lang/crystal-db/blob/2b7892eb3ab31908de4e88cc1c896da69f0d9ba9/src/spec.cr#L117","def":{"name":"select_2columns_syntax","args":[],"double_splat":null,"splat_index":null,"yields":0,"block_arg":{"name":"select_2columns_syntax","doc":null,"default_value":"","external_name":"select_2columns_syntax","restriction":"Proc(String, ColumnDef, ColumnDef, 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select_count_syntax"}},{"id":"select_scalar_syntax(&select_scalar_syntax:Proc(String,String?,String))-instance-method","html_id":"select_scalar_syntax(&amp;select_scalar_syntax:Proc(String,String?,String))-instance-method","name":"select_scalar_syntax","doc":null,"summary":null,"abstract":false,"args":[],"args_string":"(&select_scalar_syntax : Proc(String, String?, String))","source_link":"https://github.com/crystal-lang/crystal-db/blob/2b7892eb3ab31908de4e88cc1c896da69f0d9ba9/src/spec.cr#L111","source_link":"https://github.com/crystal-lang/crystal-db/blob/2b7892eb3ab31908de4e88cc1c896da69f0d9ba9/src/spec.cr#L111","def":{"name":"select_scalar_syntax","args":[],"double_splat":null,"splat_index":null,"yields":0,"block_arg":{"name":"select_scalar_syntax","doc":null,"default_value":"","external_name":"select_scalar_syntax","restriction":"Proc(String, String | ::Nil, String)"},"return_type":"","visibility":"Public","body":"@select_scalar_syntax = 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support_unprepared"}}],"macros":[],"types":[{"html_id":"github.com/crystal-lang/crystal-db/DB/DriverSpecs/ColumnDef","path":"DB/DriverSpecs/ColumnDef.html","kind":"struct","full_name":"DB::DriverSpecs::ColumnDef","name":"ColumnDef","abstract":false,"superclass":{"html_id":"github.com/crystal-lang/crystal-db/Struct","kind":"struct","full_name":"Struct","name":"Struct"},"ancestors":[{"html_id":"github.com/crystal-lang/crystal-db/Struct","kind":"struct","full_name":"Struct","name":"Struct"},{"html_id":"github.com/crystal-lang/crystal-db/Value","kind":"struct","full_name":"Value","name":"Value"},{"html_id":"github.com/crystal-lang/crystal-db/Object","kind":"class","full_name":"Object","name":"Object"}],"locations":[{"filename":"spec.cr","line_number":52,"url":"https://github.com/crystal-lang/crystal-db/blob/2b7892eb3ab31908de4e88cc1c896da69f0d9ba9/src/spec.cr"}],"repository_name":"github.com/crystal-lang/crystal-db","program":false,"enum":false,"alias":false,"aliased":"","const":false,"constants":[],"included_modules":[],"extended_modules":[],"subclasses":[],"including_types":[],"namespace":{"html_id":"github.com/crystal-lang/crystal-db/DB/DriverSpecs","kind":"class","full_name":"DB::DriverSpecs(DBAnyType)","name":"DriverSpecs"},"doc":null,"summary":null,"class_methods":[],"constructors":[{"id":"new(name:String,sql_type:String,null:Bool)-class-method","html_id":"new(name:String,sql_type:String,null:Bool)-class-method","name":"new","doc":null,"summary":null,"abstract":false,"args":[{"name":"name","doc":null,"default_value":"","external_name":"name","restriction":"String"},{"name":"sql_type","doc":null,"default_value":"","external_name":"sql_type","restriction":"String"},{"name":"null","doc":null,"default_value":"","external_name":"null","restriction":"Bool"}],"args_string":"(name 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result.close\nend\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","doc":null,"default_value":"","external_name":"query","restriction":""},{"name":"args","doc":null,"default_value":"","external_name":"args","restriction":""}],"args_string":"(query, 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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","doc":null,"default_value":"","external_name":"query","restriction":""},{"name":"args","doc":null,"default_value":"","external_name":"args","restriction":""}],"args_string":"(query, *args, &block)","source_link":"https://github.com/crystal-lang/crystal-db/blob/2b7892eb3ab31908de4e88cc1c896da69f0d9ba9/src/db/query_methods.cr#L51","source_link":"https://github.com/crystal-lang/crystal-db/blob/2b7892eb3ab31908de4e88cc1c896da69f0d9ba9/src/db/query_methods.cr#L51","def":{"name":"query","args":[{"name":"query","doc":null,"default_value":"","external_name":"query","restriction":""},{"name":"args","doc":null,"default_value":"","external_name":"args","restriction":""}],"double_splat":null,"splat_index":1,"yields":1,"block_arg":null,"return_type":"","visibility":"Public","body":"rs = query(query, 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*types* (the keys of the named tuple\nare not necessarily the column names).\n\n```\ncontacts = db.query_all \"select name, age from contacts\", as: {name: String, age: 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","doc":null,"default_value":"","external_name":"query","restriction":""},{"name":"args","doc":null,"default_value":"","external_name":"args","restriction":""},{"name":"types","doc":null,"default_value":"","external_name":"as","restriction":"NamedTuple"}],"args_string":"(query, *args, as types : 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`move_next` on the yielded result set.\n\nRaises `DB::Error` if there were no rows, or 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","doc":null,"default_value":"","external_name":"query","restriction":""},{"name":"args","doc":null,"default_value":"","external_name":"args","restriction":""}],"args_string":"(query, *args, &block : ResultSet -> U) : U forall U","source_link":"https://github.com/crystal-lang/crystal-db/blob/2b7892eb3ab31908de4e88cc1c896da69f0d9ba9/src/db/query_methods.cr#L67","source_link":"https://github.com/crystal-lang/crystal-db/blob/2b7892eb3ab31908de4e88cc1c896da69f0d9ba9/src/db/query_methods.cr#L67","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":""}],"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) do |rs|\n  if rs.move_next\n  else\n    raise(DB::Error.new(\"no rows\"))\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,astypes:Tuple)-instance-method","html_id":"query_one(query,*args,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::Error` if there were no rows, or 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":"types","doc":null,"default_value":"","external_name":"as","restriction":"Tuple"}],"args_string":"(query, *args, as types : 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*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":"types","doc":null,"default_value":"","external_name":"as","restriction":"Tuple"}],"args_string":"(query, *args, as types : 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value\nend"}},{"id":"scalar(query,*args)-instance-method","html_id":"scalar(query,*args)-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%28query%2C%2Aargs%29-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":""}],"args_string":"(query, 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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)","source_link":"https://github.com/crystal-lang/crystal-db/blob/2b7892eb3ab31908de4e88cc1c896da69f0d9ba9/src/db/result_set.cr#L28","source_link":"https://github.com/crystal-lang/crystal-db/blob/2b7892eb3ab31908de4e88cc1c896da69f0d9ba9/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":" : 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Bool","source_link":"https://github.com/crystal-lang/crystal-db/blob/2b7892eb3ab31908de4e88cc1c896da69f0d9ba9/src/db/result_set.cr#L54","source_link":"https://github.com/crystal-lang/crystal-db/blob/2b7892eb3ab31908de4e88cc1c896da69f0d9ba9/src/db/result_set.cr#L54","def":{"name":"move_next","args":[],"double_splat":null,"splat_index":null,"yields":null,"block_arg":null,"return_type":"Bool","visibility":"Public","body":""}},{"id":"read(type:DB::Mappable.class)-instance-method","html_id":"read(type:DB::Mappable.class)-instance-method","name":"read","doc":"Reads the next columns and maps them to a class","summary":"<p>Reads the next columns and maps them to a class</p>","abstract":false,"args":[{"name":"type","doc":null,"default_value":"","external_name":"type","restriction":"DB::Mappable.class"}],"args_string":"(type : DB::Mappable.class)","source_link":"https://github.com/crystal-lang/crystal-db/blob/2b7892eb3ab31908de4e88cc1c896da69f0d9ba9/src/db/result_set.cr#L73","source_link":"https://github.com/crystal-lang/crystal-db/blob/2b7892eb3ab31908de4e88cc1c896da69f0d9ba9/src/db/result_set.cr#L73","def":{"name":"read","args":[{"name":"type","doc":null,"default_value":"","external_name":"type","restriction":"DB::Mappable.class"}],"double_splat":null,"splat_index":null,"yields":null,"block_arg":null,"return_type":"","visibility":"Public","body":"type.new(self)"}},{"id":"read(type:T.class):TforallT-instance-method","html_id":"read(type:T.class):TforallT-instance-method","name":"read","doc":"Reads the next column value as a **type**","summary":"<p>Reads the next column value as a <strong>type</strong></p>","abstract":false,"args":[{"name":"type","doc":null,"default_value":"","external_name":"type","restriction":"T.class"}],"args_string":"(type : T.class) : T forall 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