Types supported to interface with database driver.
"},{"name":"VERSION","value":"\"0.4.4\"","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":"The DB module is a unified interface to database access.
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Creates a transaction from the current context.
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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/790b587e3fdf7678743c7bc0e96d5878f82baebe/src/spec.cr#L123","source_link":"https://github.com/crystal-lang/crystal-db/blob/790b587e3fdf7678743c7bc0e96d5878f82baebe/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 *sql_type*.\n*value_encoded* 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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(&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/790b587e3fdf7678743c7bc0e96d5878f82baebe/src/spec.cr#L116","source_link":"https://github.com/crystal-lang/crystal-db/blob/790b587e3fdf7678743c7bc0e96d5878f82baebe/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(&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/790b587e3fdf7678743c7bc0e96d5878f82baebe/src/spec.cr#L117","source_link":"https://github.com/crystal-lang/crystal-db/blob/790b587e3fdf7678743c7bc0e96d5878f82baebe/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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Allow specs that uses unprepared statements (default true)
Result of a #exec statement.
Empty module used for marking a class as supporting DB:Mapping
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= 1, max_pool_size = 0, max_idle_pool_size = 1, checkout_timeout = 5.0, retry_attempts = 1, retry_delay = 0.2, &factory : -> T)","source_link":"https://github.com/crystal-lang/crystal-db/blob/790b587e3fdf7678743c7bc0e96d5878f82baebe/src/db/pool.cr#L15","source_link":"https://github.com/crystal-lang/crystal-db/blob/790b587e3fdf7678743c7bc0e96d5878f82baebe/src/db/pool.cr#L15","def":{"name":"new","args":[{"name":"initial_pool_size","doc":null,"default_value":"1","external_name":"initial_pool_size","restriction":""},{"name":"max_pool_size","doc":null,"default_value":"0","external_name":"max_pool_size","restriction":""},{"name":"max_idle_pool_size","doc":null,"default_value":"1","external_name":"max_idle_pool_size","restriction":""},{"name":"checkout_timeout","doc":null,"default_value":"5.0","external_name":"checkout_timeout","restriction":""},{"name":"retry_attempts","doc":null,"default_value":"1","external_name":"retry_attempts","restriction":""},{"name":"retry_delay","doc":null,"default_value":"0.2","external_name":"retry_delay","restriction":""}],"double_splat":null,"splat_index":null,"yields":0,"block_arg":{"name":"factory","doc":null,"default_value":"","external_name":"factory","restriction":"(-> T)"},"return_type":"","visibility":"Public","body":"_ = Pool(T).allocate\n_.initialize(initial_pool_size, max_pool_size, max_idle_pool_size, checkout_timeout, retry_attempts, retry_delay, &factory) do\n yield\nend\nif _.responds_to?(:finalize)\n ::GC.add_finalizer(_)\nend\n_\n"}}],"instance_methods":[{"id":"checkout:T-instance-method","html_id":"checkout:T-instance-method","name":"checkout","doc":null,"summary":null,"abstract":false,"args":[],"args_string":" : T","source_link":"https://github.com/crystal-lang/crystal-db/blob/790b587e3fdf7678743c7bc0e96d5878f82baebe/src/db/pool.cr#L31","source_link":"https://github.com/crystal-lang/crystal-db/blob/790b587e3fdf7678743c7bc0e96d5878f82baebe/src/db/pool.cr#L31","def":{"name":"checkout","args":[],"double_splat":null,"splat_index":null,"yields":null,"block_arg":null,"return_type":"T","visibility":"Public","body":"resource = if @available.empty?\n if can_increase_pool\n build_resource\n else\n wait_for_available\n pick_available\n end\nelse\n pick_available\nend\n@available.delete(resource)\nresource.before_checkout\nresource\n"}},{"id":"checkout_some(candidates:Enumerable(WeakRef(T))):::Tuple(T,Bool)-instance-method","html_id":"checkout_some(candidates:Enumerable(WeakRef(T))):::Tuple(T,Bool)-instance-method","name":"checkout_some","doc":"```\nselected, is_candidate = pool.checkout_some(candidates)\n```\n`selected` be a resource from the `candidates` list and `is_candidate` == `true`\nor `selected` will be a new resource adn `is_candidate` == `false`","summary":"close all resources in the pool
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Executes a query and returns an array where each row is read as a tuple of the given types.
","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 : Tuple)","source_link":"https://github.com/crystal-lang/crystal-db/blob/790b587e3fdf7678743c7bc0e96d5878f82baebe/src/db/query_methods.cr#L214","source_link":"https://github.com/crystal-lang/crystal-db/blob/790b587e3fdf7678743c7bc0e96d5878f82baebe/src/db/query_methods.cr#L214","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":"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) do |rs|\n rs.read(*types)\nend"}},{"id":"query_each(query,*args,&block)-instance-method","html_id":"query_each(query,*args,&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":"Executes a query and yields the ResultSet once per each row.
Executes a query that expects a single row and yields a ResultSet positioned at that first row.
Executes a query that expects a single row and returns it as a tuple of the given types.
","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 : Tuple)","source_link":"https://github.com/crystal-lang/crystal-db/blob/790b587e3fdf7678743c7bc0e96d5878f82baebe/src/db/query_methods.cr#L85","source_link":"https://github.com/crystal-lang/crystal-db/blob/790b587e3fdf7678743c7bc0e96d5878f82baebe/src/db/query_methods.cr#L85","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":"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) do |rs|\n rs.read(*types)\nend"}},{"id":"query_one(query,*args,astypes:NamedTuple)-instance-method","html_id":"query_one(query,*args,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":"Executes a query that expects a single row and returns it as a named tuple of the given types (the keys of the named tuple are not necessarily the column names).
","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 : NamedTuple)","source_link":"https://github.com/crystal-lang/crystal-db/blob/790b587e3fdf7678743c7bc0e96d5878f82baebe/src/db/query_methods.cr#L100","source_link":"https://github.com/crystal-lang/crystal-db/blob/790b587e3fdf7678743c7bc0e96d5878f82baebe/src/db/query_methods.cr#L100","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":"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) do |rs|\n rs.read(**types)\nend"}},{"id":"query_one(query,*args,astype:Class)-instance-method","html_id":"query_one(query,*args,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":"Executes a query that expects a single row and returns the first column's value as the given type.
","abstract":false,"args":[{"name":"query","doc":null,"default_value":"","external_name":"query","restriction":""},{"name":"args","doc":null,"default_value":"","external_name":"args","restriction":""},{"name":"type","doc":null,"default_value":"","external_name":"as","restriction":"Class"}],"args_string":"(query, *args, as type : Class)","source_link":"https://github.com/crystal-lang/crystal-db/blob/790b587e3fdf7678743c7bc0e96d5878f82baebe/src/db/query_methods.cr#L114","source_link":"https://github.com/crystal-lang/crystal-db/blob/790b587e3fdf7678743c7bc0e96d5878f82baebe/src/db/query_methods.cr#L114","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":"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) do |rs|\n rs.read(type)\nend"}},{"id":"query_one?(query,*args,astype:Class)-instance-method","html_id":"query_one?(query,*args,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":"Executes a query that expects a single row and returns the first column's value as the given type.
","abstract":false,"args":[{"name":"query","doc":null,"default_value":"","external_name":"query","restriction":""},{"name":"args","doc":null,"default_value":"","external_name":"args","restriction":""},{"name":"type","doc":null,"default_value":"","external_name":"as","restriction":"Class"}],"args_string":"(query, *args, as type : Class)","source_link":"https://github.com/crystal-lang/crystal-db/blob/790b587e3fdf7678743c7bc0e96d5878f82baebe/src/db/query_methods.cr#L188","source_link":"https://github.com/crystal-lang/crystal-db/blob/790b587e3fdf7678743c7bc0e96d5878f82baebe/src/db/query_methods.cr#L188","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":"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) do |rs|\n rs.read(type)\nend"}},{"id":"query_one?(query,*args,astypes:NamedTuple)-instance-method","html_id":"query_one?(query,*args,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":"Executes a query that expects a single row and returns it as a named tuple of the given types (the keys of the named tuple are not necessarily the column names).
","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 : NamedTuple)","source_link":"https://github.com/crystal-lang/crystal-db/blob/790b587e3fdf7678743c7bc0e96d5878f82baebe/src/db/query_methods.cr#L171","source_link":"https://github.com/crystal-lang/crystal-db/blob/790b587e3fdf7678743c7bc0e96d5878f82baebe/src/db/query_methods.cr#L171","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":"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) do |rs|\n rs.read(**types)\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\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":"Executes a query that expects a single row and returns it as a tuple of the given types.
","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 : Tuple)","source_link":"https://github.com/crystal-lang/crystal-db/blob/790b587e3fdf7678743c7bc0e96d5878f82baebe/src/db/query_methods.cr#L153","source_link":"https://github.com/crystal-lang/crystal-db/blob/790b587e3fdf7678743c7bc0e96d5878f82baebe/src/db/query_methods.cr#L153","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":"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) do |rs|\n rs.read(*types)\nend"}},{"id":"query_one?(query,*args,&block:ResultSet->U):U?forallU-instance-method","html_id":"query_one?(query,*args,&block:ResultSet->U):U?forallU-instance-method","name":"query_one?","doc":"Executes a *query* that expects at most a single row and yields a `ResultSet`\npositioned at that first row.\n\nReturns `nil`, not invoking the block, if there were no rows.\n\nRaises `DB::Error` if there were more than one row\n(this ends up invoking the block once).\n\n```\nname = db.query_one? \"select name from contacts where id = ?\", 18, &.read(String)\ntypeof(name) # => String | Nil\n```","summary":"Executes a query that expects at most a single row and yields a ResultSet positioned at that first row.
Performs the #query and returns a single scalar value puts db.scalar(\"SELECT MAX(name)\").as(String) # => (a String)
The response of a query performed on a Database.
Returns the number of columns in the result
","abstract":true,"args":[],"args_string":" : Int32","source_link":"https://github.com/crystal-lang/crystal-db/blob/790b587e3fdf7678743c7bc0e96d5878f82baebe/src/db/result_set.cr#L59","source_link":"https://github.com/crystal-lang/crystal-db/blob/790b587e3fdf7678743c7bc0e96d5878f82baebe/src/db/result_set.cr#L59","def":{"name":"column_count","args":[],"double_splat":null,"splat_index":null,"yields":null,"block_arg":null,"return_type":"Int32","visibility":"Public","body":""}},{"id":"column_name(index:Int32):String-instance-method","html_id":"column_name(index:Int32):String-instance-method","name":"column_name","doc":"Returns the name of the column in `index` 0-based position.","summary":"Returns the name of the column in index 0-based position.
Returns the name of the columns.
","abstract":false,"args":[],"args_string":"","source_link":"https://github.com/crystal-lang/crystal-db/blob/790b587e3fdf7678743c7bc0e96d5878f82baebe/src/db/result_set.cr#L65","source_link":"https://github.com/crystal-lang/crystal-db/blob/790b587e3fdf7678743c7bc0e96d5878f82baebe/src/db/result_set.cr#L65","def":{"name":"column_names","args":[],"double_splat":null,"splat_index":null,"yields":null,"block_arg":null,"return_type":"","visibility":"Public","body":"Array(String).new(column_count) do |i|\n column_name(i)\nend"}},{"id":"each(&block)-instance-method","html_id":"each(&block)-instance-method","name":"each","doc":"Iterates over all the rows","summary":"Iterates over all the rows
","abstract":false,"args":[],"args_string":"(&block)","source_link":"https://github.com/crystal-lang/crystal-db/blob/790b587e3fdf7678743c7bc0e96d5878f82baebe/src/db/result_set.cr#L38","source_link":"https://github.com/crystal-lang/crystal-db/blob/790b587e3fdf7678743c7bc0e96d5878f82baebe/src/db/result_set.cr#L38","def":{"name":"each","args":[],"double_splat":null,"splat_index":null,"yields":0,"block_arg":null,"return_type":"","visibility":"Public","body":"while move_next\n yield\nend"}},{"id":"each_column(&block)-instance-method","html_id":"each_column(&block)-instance-method","name":"each_column","doc":"Iterates over all the columns","summary":"Iterates over all the columns
","abstract":false,"args":[],"args_string":"(&block)","source_link":"https://github.com/crystal-lang/crystal-db/blob/790b587e3fdf7678743c7bc0e96d5878f82baebe/src/db/result_set.cr#L45","source_link":"https://github.com/crystal-lang/crystal-db/blob/790b587e3fdf7678743c7bc0e96d5878f82baebe/src/db/result_set.cr#L45","def":{"name":"each_column","args":[],"double_splat":null,"splat_index":null,"yields":1,"block_arg":null,"return_type":"","visibility":"Public","body":"column_count.times do |x|\n yield column_name(x)\nend"}},{"id":"move_next:Bool-instance-method","html_id":"move_next:Bool-instance-method","name":"move_next","doc":"Move the next row in the result.\nReturn `false` if no more rows are available.\nSee `#each`","summary":"Move the next row in the result.
","abstract":true,"args":[],"args_string":" : Bool","source_link":"https://github.com/crystal-lang/crystal-db/blob/790b587e3fdf7678743c7bc0e96d5878f82baebe/src/db/result_set.cr#L54","source_link":"https://github.com/crystal-lang/crystal-db/blob/790b587e3fdf7678743c7bc0e96d5878f82baebe/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":"Reads the next columns and maps them to a class
","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/790b587e3fdf7678743c7bc0e96d5878f82baebe/src/db/result_set.cr#L73","source_link":"https://github.com/crystal-lang/crystal-db/blob/790b587e3fdf7678743c7bc0e96d5878f82baebe/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":"Reads the next column value as a type
","abstract":false,"args":[{"name":"type","doc":null,"default_value":"","external_name":"type","restriction":"T.class"}],"args_string":"(type : T.class) : T forall T","source_link":"https://github.com/crystal-lang/crystal-db/blob/790b587e3fdf7678743c7bc0e96d5878f82baebe/src/db/result_set.cr#L78","source_link":"https://github.com/crystal-lang/crystal-db/blob/790b587e3fdf7678743c7bc0e96d5878f82baebe/src/db/result_set.cr#L78","def":{"name":"read","args":[{"name":"type","doc":null,"default_value":"","external_name":"type","restriction":"T.class"}],"double_splat":null,"splat_index":null,"yields":null,"block_arg":null,"return_type":"T","visibility":"Public","body":"value = read\nif value.is_a?(T)\n value\nelse\n raise(\"#{self.class}#read returned a #{value.class}. A #{T} was expected.\")\nend\n"}},{"id":"read-instance-method","html_id":"read-instance-method","name":"read","doc":"Reads the next columns and returns a named tuple of the values.","summary":"Reads the next columns and returns a named tuple of the values.
","abstract":false,"args":[],"args_string":"","source_link":"https://github.com/crystal-lang/crystal-db/blob/790b587e3fdf7678743c7bc0e96d5878f82baebe/src/db/result_set.cr#L93","source_link":"https://github.com/crystal-lang/crystal-db/blob/790b587e3fdf7678743c7bc0e96d5878f82baebe/src/db/result_set.cr#L93","def":{"name":"read","args":[],"double_splat":{"name":"types","doc":null,"default_value":"","external_name":"types","restriction":"Class"},"splat_index":null,"yields":null,"block_arg":null,"return_type":"","visibility":"Public","body":"internal_read(**types)"}},{"id":"read-instance-method","html_id":"read-instance-method","name":"read","doc":"Reads the next column value","summary":"Reads the next column value
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