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560 lines
17 KiB
HTML
560 lines
17 KiB
HTML
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<title>DB::Connection - github.com/crystal-lang/crystal-db</title>
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<li class="parent open current" data-id="github.com/crystal-lang/crystal-db/DB" data-name="db">
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<a href="../DB.html">DB</a>
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<ul>
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<li class=" " data-id="github.com/crystal-lang/crystal-db/DB/Any" data-name="db::any">
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<a href="../DB/Any.html">Any</a>
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<li class=" " data-id="github.com/crystal-lang/crystal-db/DB/BeginTransaction" data-name="db::begintransaction">
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<a href="../DB/BeginTransaction.html">BeginTransaction</a>
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<li class=" current" data-id="github.com/crystal-lang/crystal-db/DB/Connection" data-name="db::connection">
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<a href="../DB/Connection.html">Connection</a>
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<li class=" " data-id="github.com/crystal-lang/crystal-db/DB/ConnectionContext" data-name="db::connectioncontext">
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<a href="../DB/ConnectionContext.html">ConnectionContext</a>
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<li class=" " data-id="github.com/crystal-lang/crystal-db/DB/ConnectionLost" data-name="db::connectionlost">
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<li class=" " data-id="github.com/crystal-lang/crystal-db/DB/ConnectionRefused" data-name="db::connectionrefused">
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<li class=" " data-id="github.com/crystal-lang/crystal-db/DB/Disposable" data-name="db::disposable">
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<a href="../DB/Disposable.html">Disposable</a>
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<li class=" " data-id="github.com/crystal-lang/crystal-db/DB/Driver" data-name="db::driver">
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<a href="../DB/Driver.html">Driver</a>
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</li>
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<li class="parent " data-id="github.com/crystal-lang/crystal-db/DB/DriverSpecs" data-name="db::driverspecs(dbanytype)">
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<a href="../DB/DriverSpecs.html">DriverSpecs</a>
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<ul>
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<li class=" " data-id="github.com/crystal-lang/crystal-db/DB/DriverSpecs/ColumnDef" data-name="db::driverspecs::columndef">
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<a href="../DB/DriverSpecs/ColumnDef.html">ColumnDef</a>
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<li class=" " data-id="github.com/crystal-lang/crystal-db/DB/Error" data-name="db::error">
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<a href="../DB/Error.html">Error</a>
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</li>
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<li class=" " data-id="github.com/crystal-lang/crystal-db/DB/ExecResult" data-name="db::execresult">
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<a href="../DB/ExecResult.html">ExecResult</a>
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</li>
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<li class=" " data-id="github.com/crystal-lang/crystal-db/DB/Mappable" data-name="db::mappable">
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<a href="../DB/Mappable.html">Mappable</a>
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</li>
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<li class=" " data-id="github.com/crystal-lang/crystal-db/DB/MappingException" data-name="db::mappingexception">
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<a href="../DB/MappingException.html">MappingException</a>
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</li>
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<li class="parent " data-id="github.com/crystal-lang/crystal-db/DB/Pool" data-name="db::pool(t)">
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<a href="../DB/Pool.html">Pool</a>
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<ul>
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<li class=" " data-id="github.com/crystal-lang/crystal-db/DB/Pool/TimeoutHelper" data-name="db::pool::timeouthelper">
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<a href="../DB/Pool/TimeoutHelper.html">TimeoutHelper</a>
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</li>
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</ul>
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<li class=" " data-id="github.com/crystal-lang/crystal-db/DB/PoolPreparedStatement" data-name="db::poolpreparedstatement">
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<a href="../DB/PoolPreparedStatement.html">PoolPreparedStatement</a>
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</li>
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<li class=" " data-id="github.com/crystal-lang/crystal-db/DB/PoolRetryAttemptsExceeded" data-name="db::poolretryattemptsexceeded">
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<a href="../DB/PoolRetryAttemptsExceeded.html">PoolRetryAttemptsExceeded</a>
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</li>
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<li class=" " data-id="github.com/crystal-lang/crystal-db/DB/PoolStatement" data-name="db::poolstatement">
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<a href="../DB/PoolStatement.html">PoolStatement</a>
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</li>
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<li class=" " data-id="github.com/crystal-lang/crystal-db/DB/PoolTimeout" data-name="db::pooltimeout">
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<a href="../DB/PoolTimeout.html">PoolTimeout</a>
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</li>
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<li class=" " data-id="github.com/crystal-lang/crystal-db/DB/PoolUnpreparedStatement" data-name="db::poolunpreparedstatement">
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<a href="../DB/PoolUnpreparedStatement.html">PoolUnpreparedStatement</a>
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</li>
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<li class=" " data-id="github.com/crystal-lang/crystal-db/DB/QueryMethods" data-name="db::querymethods">
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<a href="../DB/QueryMethods.html">QueryMethods</a>
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</li>
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<li class=" " data-id="github.com/crystal-lang/crystal-db/DB/ResultSet" data-name="db::resultset">
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<a href="../DB/ResultSet.html">ResultSet</a>
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</li>
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<li class=" " data-id="github.com/crystal-lang/crystal-db/DB/Rollback" data-name="db::rollback">
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<a href="../DB/Rollback.html">Rollback</a>
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</li>
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<li class=" " data-id="github.com/crystal-lang/crystal-db/DB/SavePointTransaction" data-name="db::savepointtransaction">
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<a href="../DB/SavePointTransaction.html">SavePointTransaction</a>
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</li>
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<li class="parent " data-id="github.com/crystal-lang/crystal-db/DB/SessionMethods" data-name="db::sessionmethods(session, stmt)">
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<a href="../DB/SessionMethods.html">SessionMethods</a>
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<ul>
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<li class=" " data-id="github.com/crystal-lang/crystal-db/DB/SessionMethods/PreparedQuery" data-name="db::sessionmethods::preparedquery(session, stmt)">
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<a href="../DB/SessionMethods/PreparedQuery.html">PreparedQuery</a>
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</li>
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<li class=" " data-id="github.com/crystal-lang/crystal-db/DB/SessionMethods/UnpreparedQuery" data-name="db::sessionmethods::unpreparedquery(session, stmt)">
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<a href="../DB/SessionMethods/UnpreparedQuery.html">UnpreparedQuery</a>
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</li>
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</ul>
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</li>
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<li class=" " data-id="github.com/crystal-lang/crystal-db/DB/Statement" data-name="db::statement">
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<a href="../DB/Statement.html">Statement</a>
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</li>
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<li class=" " data-id="github.com/crystal-lang/crystal-db/DB/StatementMethods" data-name="db::statementmethods">
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<a href="../DB/StatementMethods.html">StatementMethods</a>
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</li>
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<li class=" " data-id="github.com/crystal-lang/crystal-db/DB/StringKeyCache" data-name="db::stringkeycache(t)">
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<a href="../DB/StringKeyCache.html">StringKeyCache</a>
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</li>
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<li class=" " data-id="github.com/crystal-lang/crystal-db/DB/TopLevelTransaction" data-name="db::topleveltransaction">
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<a href="../DB/TopLevelTransaction.html">TopLevelTransaction</a>
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</li>
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<li class=" " data-id="github.com/crystal-lang/crystal-db/DB/Transaction" data-name="db::transaction">
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<a href="../DB/Transaction.html">Transaction</a>
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</li>
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</ul>
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</li>
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</ul>
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</div>
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<div id="main-content">
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<h1 class="type-name">
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<span class="kind">abstract class</span> DB::Connection
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</h1>
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<ul class="superclass-hierarchy"><li class="superclass"><a href="../DB/Connection.html">DB::Connection</a></li><li class="superclass">Reference</li><li class="superclass">Object</li></ul>
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<h2>Overview</h2>
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<p>Database driver implementors must subclass <code><a href="../DB/Connection.html">Connection</a></code>.</p>
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<p>Represents one active connection to a database.</p>
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<p>Users should never instantiate a <code><a href="../DB/Connection.html">Connection</a></code> manually. Use <code><a href="../DB.html#open%28uri%3AURI%7CString%29-class-method">DB#open</a></code> or <code>Database#connection</code>.</p>
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<p>Refer to <code><a href="../DB/QueryMethods.html">QueryMethods</a></code> for documentation about querying the database through this connection.</p>
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<h3>Note to implementors</h3>
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<p>The connection must be initialized in <code>#initialize</code> and closed in <code>#do_close</code>.</p>
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<p>Override <code>#build_prepared_statement</code> method in order to return a prepared <code><a href="../DB/Statement.html">Statement</a></code> to allow querying.
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Override <code>#build_unprepared_statement</code> method in order to return a unprepared <code><a href="../DB/Statement.html">Statement</a></code> to allow querying.
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See also <code><a href="../DB/Statement.html">Statement</a></code> to define how the statements are executed.</p>
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<p>If at any give moment the connection is lost a DB::ConnectionLost should be raised. This will
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allow the connection pool to try to reconnect or use another connection if available.</p>
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<h2>Included Modules</h2>
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<ul class="other-types-list">
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<li class="other-type"><a href="../DB/BeginTransaction.html">DB::BeginTransaction</a></li>
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<li class="other-type"><a href="../DB/Disposable.html">DB::Disposable</a></li>
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<li class="other-type"><a href="../DB/SessionMethods.html">DB::SessionMethods</a>(<a href="../DB/Connection.html">DB::Connection</a>, <a href="../DB/Statement.html">DB::Statement</a>)</li>
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</ul>
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<h2>Defined in:</h2>
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<a href="https://github.com/crystal-lang/crystal-db/blob/28c6f3b715f0c82d2a37106fd5a55882a238cc1f/src/db/connection.cr#L21" target="_blank">db/connection.cr</a>
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<br/>
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<h2>Class Method Summary</h2>
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<ul class="list-summary">
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<li class="entry-summary">
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<a href="#new%28context%3AConnectionContext%29-class-method" class="signature"><strong>.new</strong>(context : ConnectionContext)</a>
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</li>
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</ul>
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<h2>Instance Method Summary</h2>
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<ul class="list-summary">
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<li class="entry-summary">
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<a href="#begin_transaction-instance-method" class="signature"><strong>#begin_transaction</strong></a>
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</li>
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<li class="entry-summary">
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<a href="#prepared_statements%3F%3ABool-instance-method" class="signature"><strong>#prepared_statements?</strong> : Bool</a>
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</li>
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<li class="entry-summary">
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<a href="#release-instance-method" class="signature"><strong>#release</strong></a>
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<div class="summary"><p>return this connection to the pool managed by the database.</p></div>
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</li>
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</ul>
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<div class="methods-inherited">
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<h3>Instance methods inherited from module <code><a href="../DB/BeginTransaction.html">DB::BeginTransaction</a></code></h3>
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<a href="../DB/BeginTransaction.html#begin_transaction%3ATransaction-instance-method" class="tooltip">
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<span>begin_transaction : Transaction</span>
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begin_transaction</a>,
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<a href="../DB/BeginTransaction.html#transaction%28%26block%29-instance-method" class="tooltip">
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<span>transaction(&block)</span>
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transaction</a>
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<h3>Instance methods inherited from module <code><a href="../DB/SessionMethods.html">DB::SessionMethods</a>(<a href="../DB/Connection.html">DB::Connection</a>, <a href="../DB/Statement.html">DB::Statement</a>)</code></h3>
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<a href="../DB/SessionMethods.html#build%28query%29%3AStmt-instance-method" class="tooltip">
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<span>build(query) : Stmt</span>
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build</a>,
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<a href="../DB/SessionMethods.html#build_unprepared_statement%28query%29%3AStmt-instance-method" class="tooltip">
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<span>build_unprepared_statement(query) : Stmt</span>
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build_unprepared_statement</a>,
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<a href="../DB/SessionMethods.html#fetch_or_build_prepared_statement%28query%29%3AStmt-instance-method" class="tooltip">
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<span>fetch_or_build_prepared_statement(query) : Stmt</span>
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fetch_or_build_prepared_statement</a>,
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<a href="../DB/SessionMethods.html#prepared%28query%29-instance-method" class="tooltip">
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<span>prepared(query)<br/>prepared</span>
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prepared</a>,
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<a href="../DB/SessionMethods.html#prepared_statements%3F%3ABool-instance-method" class="tooltip">
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<span>prepared_statements? : Bool</span>
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prepared_statements?</a>,
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<a href="../DB/SessionMethods.html#unprepared%28query%29-instance-method" class="tooltip">
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<span>unprepared(query)<br/>unprepared</span>
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unprepared</a>
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<h3>Instance methods inherited from module <code><a href="../DB/QueryMethods.html">DB::QueryMethods</a></code></h3>
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<a href="../DB/QueryMethods.html#exec%28query%2C%2Aargs%29-instance-method" class="tooltip">
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<span>exec(query, *args)</span>
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exec</a>,
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<a href="../DB/QueryMethods.html#query%28query%2C%2Aargs%29-instance-method" class="tooltip">
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<span>query(query, *args)<br/>query(query, *args, &block)</span>
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query</a>,
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<a href="../DB/QueryMethods.html#query_all%28query%2C%2Aargs%2C%26block%3AResultSet-%3EU%29%3AArray%28U%29forallU-instance-method" class="tooltip">
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<span>query_all(query, *args, &block : ResultSet -> U) : Array(U) forall U<br/>query_all(query, *args, as types : Tuple)<br/>query_all(query, *args, as type : Class)</span>
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query_all</a>,
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<a href="../DB/QueryMethods.html#query_each%28query%2C%2Aargs%2C%26block%29-instance-method" class="tooltip">
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<span>query_each(query, *args, &block)</span>
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query_each</a>,
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<a href="../DB/QueryMethods.html#query_one%28query%2C%2Aargs%2C%26block%3AResultSet-%3EU%29%3AUforallU-instance-method" class="tooltip">
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<span>query_one(query, *args, &block : ResultSet -> U) : U forall U<br/>query_one(query, *args, as types : Tuple)<br/>query_one(query, *args, as type : Class)</span>
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query_one</a>,
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<a href="../DB/QueryMethods.html#query_one%3F%28query%2C%2Aargs%2C%26block%3AResultSet-%3EU%29%3AU%3FforallU-instance-method" class="tooltip">
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<span>query_one?(query, *args, &block : ResultSet -> U) : U? forall U<br/>query_one?(query, *args, as types : Tuple)<br/>query_one?(query, *args, as type : Class)</span>
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query_one?</a>,
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<a href="../DB/QueryMethods.html#scalar%28query%2C%2Aargs%29-instance-method" class="tooltip">
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<span>scalar(query, *args)</span>
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scalar</a>
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<h3>Instance methods inherited from module <code><a href="../DB/Disposable.html">DB::Disposable</a></code></h3>
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<a href="../DB/Disposable.html#close-instance-method" class="tooltip">
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<span>close</span>
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close</a>,
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<a href="../DB/Disposable.html#closed%3F-instance-method" class="tooltip">
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<span>closed?</span>
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closed?</a>
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</div>
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<h2>Class Method Detail</h2>
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<div class="entry-detail" id="new(context:ConnectionContext)-class-method">
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<div class="signature">
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def self.<strong>new</strong>(context : <a href="../DB/ConnectionContext.html">ConnectionContext</a>)
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<a class="method-permalink" href="#new%28context%3AConnectionContext%29-class-method">#</a>
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</div>
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<br/>
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<div>
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[<a href="https://github.com/crystal-lang/crystal-db/blob/28c6f3b715f0c82d2a37106fd5a55882a238cc1f/src/db/connection.cr#L34" target="_blank">View source</a>]
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</div>
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</div>
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<h2>Instance Method Detail</h2>
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<div class="entry-detail" id="begin_transaction-instance-method">
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<div class="signature">
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def <strong>begin_transaction</strong>
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<a class="method-permalink" href="#begin_transaction-instance-method">#</a>
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</div>
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<br/>
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<div>
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[<a href="https://github.com/crystal-lang/crystal-db/blob/28c6f3b715f0c82d2a37106fd5a55882a238cc1f/src/db/connection.cr#L49" target="_blank">View source</a>]
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</div>
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</div>
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<div class="entry-detail" id="prepared_statements?:Bool-instance-method">
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<div class="signature">
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def <strong>prepared_statements?</strong> : Bool
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<a class="method-permalink" href="#prepared_statements%3F%3ABool-instance-method">#</a>
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</div>
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<br/>
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<div>
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[<a href="https://github.com/crystal-lang/crystal-db/blob/28c6f3b715f0c82d2a37106fd5a55882a238cc1f/src/db/connection.cr#L30" target="_blank">View source</a>]
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</div>
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</div>
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<div class="entry-detail" id="release-instance-method">
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<div class="signature">
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def <strong>release</strong>
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<a class="method-permalink" href="#release-instance-method">#</a>
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</div>
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<div class="doc"><p>return this connection to the pool
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managed by the database. Should be used
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only if the connection was obtained by <code><a href="../DB/Database.html#checkout-instance-method">Database#checkout</a></code>.</p></div>
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<br/>
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<div>
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[<a href="https://github.com/crystal-lang/crystal-db/blob/28c6f3b715f0c82d2a37106fd5a55882a238cc1f/src/db/connection.cr#L77" target="_blank">View source</a>]
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</div>
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</div>
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</div>
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</body>
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</html>
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