shard-crystal-db/api/0.7.0/index.json
2019-09-23 14:55:46 -03:00

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{"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* [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\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":"github.com/crystal-lang/crystal-db/toplevel","path":"toplevel.html","kind":"module","full_name":"Top Level Namespace","name":"Top Level Namespace","abstract":false,"superclass":null,"ancestors":[{"html_id":"github.com/crystal-lang/crystal-db/Spec/Methods","kind":"module","full_name":"Spec::Methods","name":"Methods"},{"html_id":"github.com/crystal-lang/crystal-db/Spec/Expectations","kind":"module","full_name":"Spec::Expectations","name":"Expectations"}],"locations":[],"repository_name":"github.com/crystal-lang/crystal-db","program":true,"enum":false,"alias":false,"aliased":"","const":false,"constants":[],"included_modules":[{"html_id":"github.com/crystal-lang/crystal-db/Spec/Expectations","kind":"module","full_name":"Spec::Expectations","name":"Expectations"},{"html_id":"github.com/crystal-lang/crystal-db/Spec/Methods","kind":"module","full_name":"Spec::Methods","name":"Methods"}],"extended_modules":[{"html_id":"github.com/crystal-lang/crystal-db/Spec/Expectations","kind":"module","full_name":"Spec::Expectations","name":"Expectations"},{"html_id":"github.com/crystal-lang/crystal-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":"github.com/crystal-lang/crystal-db/DB","path":"DB.html","kind":"module","full_name":"DB","name":"DB","abstract":false,"superclass":null,"ancestors":[],"locations":[{"filename":"db.cr","line_number":77,"url":"https://github.com/crystal-lang/crystal-db/blob/2b95d69e685da6f44835439baad73977f27a3907/src/db.cr"},{"filename":"db/pool.cr","line_number":3,"url":"https://github.com/crystal-lang/crystal-db/blob/2b95d69e685da6f44835439baad73977f27a3907/src/db/pool.cr"},{"filename":"db/string_key_cache.cr","line_number":1,"url":"https://github.com/crystal-lang/crystal-db/blob/2b95d69e685da6f44835439baad73977f27a3907/src/db/string_key_cache.cr"},{"filename":"db/enumerable_concat.cr","line_number":1,"url":"https://github.com/crystal-lang/crystal-db/blob/2b95d69e685da6f44835439baad73977f27a3907/src/db/enumerable_concat.cr"},{"filename":"db/query_methods.cr","line_number":1,"url":"https://github.com/crystal-lang/crystal-db/blob/2b95d69e685da6f44835439baad73977f27a3907/src/db/query_methods.cr"},{"filename":"db/session_methods.cr","line_number":1,"url":"https://github.com/crystal-lang/crystal-db/blob/2b95d69e685da6f44835439baad73977f27a3907/src/db/session_methods.cr"},{"filename":"db/disposable.cr","line_number":1,"url":"https://github.com/crystal-lang/crystal-db/blob/2b95d69e685da6f44835439baad73977f27a3907/src/db/disposable.cr"},{"filename":"db/driver.cr","line_number":1,"url":"https://github.com/crystal-lang/crystal-db/blob/2b95d69e685da6f44835439baad73977f27a3907/src/db/driver.cr"},{"filename":"db/statement.cr","line_number":1,"url":"https://github.com/crystal-lang/crystal-db/blob/2b95d69e685da6f44835439baad73977f27a3907/src/db/statement.cr"},{"filename":"db/begin_transaction.cr","line_number":1,"url":"https://github.com/crystal-lang/crystal-db/blob/2b95d69e685da6f44835439baad73977f27a3907/src/db/begin_transaction.cr"},{"filename":"db/connection_context.cr","line_number":1,"url":"https://github.com/crystal-lang/crystal-db/blob/2b95d69e685da6f44835439baad73977f27a3907/src/db/connection_context.cr"},{"filename":"db/connection.cr","line_number":1,"url":"https://github.com/crystal-lang/crystal-db/blob/2b95d69e685da6f44835439baad73977f27a3907/src/db/connection.cr"},{"filename":"db/transaction.cr","line_number":1,"url":"https://github.com/crystal-lang/crystal-db/blob/2b95d69e685da6f44835439baad73977f27a3907/src/db/transaction.cr"},{"filename":"db/pool_statement.cr","line_number":1,"url":"https://github.com/crystal-lang/crystal-db/blob/2b95d69e685da6f44835439baad73977f27a3907/src/db/pool_statement.cr"},{"filename":"db/database.cr","line_number":4,"url":"https://github.com/crystal-lang/crystal-db/blob/2b95d69e685da6f44835439baad73977f27a3907/src/db/database.cr"},{"filename":"db/pool_prepared_statement.cr","line_number":1,"url":"https://github.com/crystal-lang/crystal-db/blob/2b95d69e685da6f44835439baad73977f27a3907/src/db/pool_prepared_statement.cr"},{"filename":"db/pool_unprepared_statement.cr","line_number":1,"url":"https://github.com/crystal-lang/crystal-db/blob/2b95d69e685da6f44835439baad73977f27a3907/src/db/pool_unprepared_statement.cr"},{"filename":"db/result_set.cr","line_number":1,"url":"https://github.com/crystal-lang/crystal-db/blob/2b95d69e685da6f44835439baad73977f27a3907/src/db/result_set.cr"},{"filename":"db/error.cr","line_number":1,"url":"https://github.com/crystal-lang/crystal-db/blob/2b95d69e685da6f44835439baad73977f27a3907/src/db/error.cr"},{"filename":"db/mapping.cr","line_number":1,"url":"https://github.com/crystal-lang/crystal-db/blob/2b95d69e685da6f44835439baad73977f27a3907/src/db/mapping.cr"},{"filename":"spec.cr","line_number":9,"url":"https://github.com/crystal-lang/crystal-db/blob/2b95d69e685da6f44835439baad73977f27a3907/src/spec.cr"},{"filename":"db/version.cr","line_number":1,"url":"https://github.com/crystal-lang/crystal-db/blob/2b95d69e685da6f44835439baad73977f27a3907/src/db/version.cr"}],"repository_name":"github.com/crystal-lang/crystal-db","program":false,"enum":false,"alias":false,"aliased":"","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":"\"0.7.0\"","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\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)","source_link":"https://github.com/crystal-lang/crystal-db/blob/2b95d69e685da6f44835439baad73977f27a3907/src/db.cr#L133","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,&block)-class-method","html_id":"connect(uri:URI|String,&amp;block)-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, &block)","source_link":"https://github.com/crystal-lang/crystal-db/blob/2b95d69e685da6f44835439baad73977f27a3907/src/db.cr#L138","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)","source_link":"https://github.com/crystal-lang/crystal-db/blob/2b95d69e685da6f44835439baad73977f27a3907/src/db.cr#L115","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 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, &block)","source_link":"https://github.com/crystal-lang/crystal-db/blob/2b95d69e685da6f44835439baad73977f27a3907/src/db.cr#L120","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>)","source_link":"https://github.com/crystal-lang/crystal-db/blob/2b95d69e685da6f44835439baad73977f27a3907/src/db.cr#L99","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```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::MappingException`.\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 `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>)","source_link":"https://github.com/crystal-lang/crystal-db/blob/2b95d69e685da6f44835439baad73977f27a3907/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] != 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proc\n@pool.each_resource do |conn|\n @setup_connection.call(conn)\nend\n"}},{"id":"transaction(&block)-instance-method","html_id":"transaction(&amp;block)-instance-method","name":"transaction","doc":"yields a `Transaction` from a connection of the pool\nRefer to `BeginTransaction#transaction` for documentation.","summary":"<p>yields a <code><a href=\"../DB/Transaction.html\">Transaction</a></code> from a connection of the pool Refer to <code><a href=\"../DB/BeginTransaction.html#transaction(&block)-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/2b95d69e685da6f44835439baad73977f27a3907/src/db/database.cr#L131","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/2b95d69e685da6f44835439baad73977f27a3907/src/db/database.cr#L42","def":{"name":"uri","args":[],"double_splat":null,"splat_index":null,"yields":null,"block_arg":null,"return_type":"URI","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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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`, 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= <span class=\"n\">nil</span>)","source_link":"https://github.com/crystal-lang/crystal-db/blob/2b95d69e685da6f44835439baad73977f27a3907/src/db/query_methods.cr#L45","def":{"name":"query","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)).query(*args_, args: args)"}},{"id":"query(query,*args_,args:Array?=nil,&block)-instance-method","html_id":"query(query,*args_,args:Array?=nil,&amp;block)-instance-method","name":"query","doc":"Executes a *query* and yields a `ResultSet` with the results.\nThe `ResultSet` is closed automatically.\n\n```\ndb.query(\"select name from contacts where age > ?\", 18) do |rs|\n rs.each do\n name = rs.read(String)\n end\nend\n```","summary":"<p>Executes a <em>query</em> and yields a <code><a href=\"../DB/ResultSet.html\">ResultSet</a></code> with the results.</p>","abstract":false,"args":[{"name":"query","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)","source_link":"https://github.com/crystal-lang/crystal-db/blob/2b95d69e685da6f44835439baad73977f27a3907/src/db/query_methods.cr#L59","def":{"name":"query","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":null,"return_type":"","visibility":"Public","body":"rs = query(query, *args_, args: args)\nbegin\n yield rs\nensure\n rs.close\nend\n"}},{"id":"query_all(query,*args_,args:Array?=nil,astype:Class)-instance-method","html_id":"query_all(query,*args_,args:Array?=nil,astype:Class)-instance-method","name":"query_all","doc":"Executes a *query* and returns an array where the\nvalue of each row is read as the given *type*.\n\n```\nnames = db.query_all \"select name from contacts\", as: String\n```","summary":"<p>Executes a <em>query</em> and returns an array where the value of each row is read 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)","source_link":"https://github.com/crystal-lang/crystal-db/blob/2b95d69e685da6f44835439baad73977f27a3907/src/db/query_methods.cr#L247","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":"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_all(query, *args_, args: args) do |rs|\n rs.read(type)\nend"}},{"id":"query_all(query,*args_,args:Array?=nil,astypes:NamedTuple)-instance-method","html_id":"query_all(query,*args_,args:Array?=nil,astypes:NamedTuple)-instance-method","name":"query_all","doc":"Executes a *query* and returns an array where each row is\nread as a named tuple of the given *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":"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)","source_link":"https://github.com/crystal-lang/crystal-db/blob/2b95d69e685da6f44835439baad73977f27a3907/src/db/query_methods.cr#L235","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":"NamedTuple"}],"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_all(query,*args_,args:Array?=nil,&block:ResultSet->U):Array(U)forallU-instance-method","html_id":"query_all(query,*args_,args:Array?=nil,&amp;block:ResultSet-&gt;U):Array(U)forallU-instance-method","name":"query_all","doc":"Executes a *query* and yield a `ResultSet` positioned at the beginning\nof each row, returning an array of the values of the blocks.\n\n```\nnames = db.query_all \"select name from contacts\", &.read(String)\n```","summary":"<p>Executes a <em>query</em> and yield a <code><a href=\"../DB/ResultSet.html\">ResultSet</a></code> positioned at the beginning of each row, returning an array of the values of the blocks.</p>","abstract":false,"args":[{"name":"query","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) : Array(U) forall U","source_link":"https://github.com/crystal-lang/crystal-db/blob/2b95d69e685da6f44835439baad73977f27a3907/src/db/query_methods.cr#L208","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"}],"double_splat":null,"splat_index":1,"yields":1,"block_arg":{"name":"block","doc":null,"default_value":"","external_name":"block","restriction":"(ResultSet -> U)"},"return_type":"Array(U)","visibility":"Public","body":"ary = [] of U\nquery_each(query, *args_, args: args) do |rs|\n ary.push(yield rs)\nend\nary\n"}},{"id":"query_all(query,*args_,args:Array?=nil,astypes:Tuple)-instance-method","html_id":"query_all(query,*args_,args:Array?=nil,astypes:Tuple)-instance-method","name":"query_all","doc":"Executes a *query* and returns an array where each row is\nread as a tuple of the given *types*.\n\n```\ncontacts = db.query_all \"select name, age from contacts\", as: {String, Int32}\n```","summary":"<p>Executes a <em>query</em> and returns an array where each row is read as a tuple of the given <em>types</em>.</p>","abstract":false,"args":[{"name":"query","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)","source_link":"https://github.com/crystal-lang/crystal-db/blob/2b95d69e685da6f44835439baad73977f27a3907/src/db/query_methods.cr#L222","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,&block)-instance-method","html_id":"query_each(query,*args_,args:Array?=nil,&amp;block)-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? = <span class=\"n\">nil</span>, &block)","source_link":"https://github.com/crystal-lang/crystal-db/blob/2b95d69e685da6f44835439baad73977f27a3907/src/db/query_methods.cr#L261","def":{"name":"query_each","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":null,"return_type":"","visibility":"Public","body":"query(query, *args_, args: args) do |rs|\n rs.each do\n yield rs\n end\nend"}},{"id":"query_one(query,*args_,args:Array?=nil,&block:ResultSet->U):UforallU-instance-method","html_id":"query_one(query,*args_,args:Array?=nil,&amp;block:ResultSet-&gt;U):UforallU-instance-method","name":"query_one","doc":"Executes a *query* that expects a single row and yields a `ResultSet`\npositioned at that first row.\n\nThe given block must not invoke `move_next` on the yielded result set.\n\nRaises `DB::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":""},{"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","source_link":"https://github.com/crystal-lang/crystal-db/blob/2b95d69e685da6f44835439baad73977f27a3907/src/db/query_methods.cr#L75","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::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_,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::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":"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)","source_link":"https://github.com/crystal-lang/crystal-db/blob/2b95d69e685da6f44835439baad73977f27a3907/src/db/query_methods.cr#L93","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::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: {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? = <span class=\"n\">nil</span>, as types : NamedTuple)","source_link":"https://github.com/crystal-lang/crystal-db/blob/2b95d69e685da6f44835439baad73977f27a3907/src/db/query_methods.cr#L108","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,astype:Class)-instance-method","html_id":"query_one(query,*args_,args:Array?=nil,astype:Class)-instance-method","name":"query_one","doc":"Executes a *query* that expects a single row\nand returns the first column's value as the given *type*.\n\nRaises `DB::Error` if there were no rows, or if there were more than one row.\n\n```\ndb.query_one \"select name from contacts where id = ?\", 1, as: String\n```","summary":"<p>Executes a <em>query</em> that expects a single row and returns the first column's value as the given <em>type</em>.</p>","abstract":false,"args":[{"name":"query","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)","source_link":"https://github.com/crystal-lang/crystal-db/blob/2b95d69e685da6f44835439baad73977f27a3907/src/db/query_methods.cr#L122","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,astype:Class)-instance-method","html_id":"query_one?(query,*args_,args:Array?=nil,astype:Class)-instance-method","name":"query_one?","doc":"Executes a *query* that expects a single row\nand returns the first column's value as the given *type*.\n\nReturns `nil` if there were no rows.\n\nRaises `DB::Error` if there were more than one row.\n\n```\nname = db.query_one? \"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)","source_link":"https://github.com/crystal-lang/crystal-db/blob/2b95d69e685da6f44835439baad73977f27a3907/src/db/query_methods.cr#L196","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)","source_link":"https://github.com/crystal-lang/crystal-db/blob/2b95d69e685da6f44835439baad73977f27a3907/src/db/query_methods.cr#L179","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)","source_link":"https://github.com/crystal-lang/crystal-db/blob/2b95d69e685da6f44835439baad73977f27a3907/src/db/query_methods.cr#L161","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,&amp;block:ResultSet-&gt;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? 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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. 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