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644 lines
20 KiB
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<meta id="repository-name" content="github.com/crystal-lang/crystal-db">
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<script type="text/javascript" src="../js/doc.js"></script>
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<title>DB::ResultSet - github.com/crystal-lang/crystal-db</title>
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<ul>
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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=" " 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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<a href="../DB/ConnectionLost.html">ConnectionLost</a>
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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/Database" data-name="db::database">
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<a href="../DB/Database.html">Database</a>
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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>
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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=" current" 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::ResultSet
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</h1>
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<ul class="superclass-hierarchy"><li class="superclass"><a href="../DB/ResultSet.html">DB::ResultSet</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>The response of a query performed on a <code><a href="../DB/Database.html">Database</a></code>.</p>
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<p>See <code><a href="../DB.html">DB</a></code> for a complete sample.</p>
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<p>Each <code><a href="../DB/ResultSet.html#read-instance-method">#read</a></code> call consumes the result and moves to the next column.
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Each column must be read in order.
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At any moment a <code><a href="../DB/ResultSet.html#move_next%3ABool-instance-method">#move_next</a></code> can be invoked, meaning to skip the
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remaining, or even all the columns, in the current row.
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Also it is not mandatory to consume the whole <code><a href="../DB/ResultSet.html">ResultSet</a></code>, hence an iteration
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through <code><a href="../DB/ResultSet.html#each%28%26block%29-instance-method">#each</a></code> or <code><a href="../DB/ResultSet.html#move_next%3ABool-instance-method">#move_next</a></code> can be stopped.</p>
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<p><strong>Note:</strong> depending on how the <code><a href="../DB/ResultSet.html">ResultSet</a></code> was obtained it might be mandatory an
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explicit call to <code>#close</code>. Check <code><a href="../DB/QueryMethods.html#query%28query%2C%2Aargs%29-instance-method">QueryMethods#query</a></code>.</p>
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<h3>Note to implementors</h3>
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<ol><li>Override <code><a href="../DB/ResultSet.html#move_next%3ABool-instance-method">#move_next</a></code> to move to the next row.</li><li>Override <code><a href="../DB/ResultSet.html#read-instance-method">#read</a></code> returning the next value in the row.</li><li>(Optional) Override <code><a href="../DB/ResultSet.html#read%28type%3ADB%3A%3AMappable.class%29-instance-method">#read(t)</a></code> for some types <code>t</code> for which custom logic other than a simple cast is needed.</li><li>Override <code><a href="../DB/ResultSet.html#column_count%3AInt32-instance-method">#column_count</a></code>, <code><a href="../DB/ResultSet.html#column_name%28index%3AInt32%29%3AString-instance-method">#column_name</a></code>.</li></ol>
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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/Disposable.html">DB::Disposable</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/437f8c39eccc82628223eff965d740fd3389499a/src/db/result_set.cr#L22" target="_blank">db/result_set.cr</a>
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<br/>
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<h2>Constructors</h2>
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<ul class="list-summary">
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<li class="entry-summary">
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<a href="#new%28statement%3ADB%3A%3AStatement%29-class-method" class="signature"><strong>.new</strong>(statement : DB::Statement)</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="#column_count%3AInt32-instance-method" class="signature"><strong>#column_count</strong> : Int32</a>
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<div class="summary"><p>Returns the number of columns in the result</p></div>
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</li>
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<li class="entry-summary">
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<a href="#column_name%28index%3AInt32%29%3AString-instance-method" class="signature"><strong>#column_name</strong>(index : Int32) : String</a>
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<div class="summary"><p>Returns the name of the column in <code>index</code> 0-based position.</p></div>
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</li>
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<li class="entry-summary">
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<a href="#column_names-instance-method" class="signature"><strong>#column_names</strong></a>
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<div class="summary"><p>Returns the name of the columns.</p></div>
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</li>
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<li class="entry-summary">
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<a href="#each%28%26block%29-instance-method" class="signature"><strong>#each</strong>(&block)</a>
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<div class="summary"><p>Iterates over all the rows</p></div>
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</li>
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<li class="entry-summary">
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<a href="#each_column%28%26block%29-instance-method" class="signature"><strong>#each_column</strong>(&block)</a>
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<div class="summary"><p>Iterates over all the columns</p></div>
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</li>
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<li class="entry-summary">
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<a href="#move_next%3ABool-instance-method" class="signature"><strong>#move_next</strong> : Bool</a>
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<div class="summary"><p>Move the next row in the result.</p></div>
|
||
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|
||
|
|
</li>
|
||
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|
||
|
|
<li class="entry-summary">
|
||
|
|
<a href="#read%28type%3ADB%3A%3AMappable.class%29-instance-method" class="signature"><strong>#read</strong>(type : DB::Mappable.class)</a>
|
||
|
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|
||
|
|
<div class="summary"><p>Reads the next columns and maps them to a class</p></div>
|
||
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|
||
|
|
</li>
|
||
|
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|
||
|
|
<li class="entry-summary">
|
||
|
|
<a href="#read%28type%3AT.class%29%3ATforallT-instance-method" class="signature"><strong>#read</strong>(type : T.class) : T forall T</a>
|
||
|
|
|
||
|
|
<div class="summary"><p>Reads the next column value as a <strong>type</strong></p></div>
|
||
|
|
|
||
|
|
</li>
|
||
|
|
|
||
|
|
<li class="entry-summary">
|
||
|
|
<a href="#read-instance-method" class="signature"><strong>#read</strong></a>
|
||
|
|
|
||
|
|
<div class="summary"><p>Reads the next column value</p></div>
|
||
|
|
|
||
|
|
</li>
|
||
|
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|
||
|
|
<li class="entry-summary">
|
||
|
|
<a href="#read%28%2Atypes%3AClass%29-instance-method" class="signature"><strong>#read</strong>(*types : Class)</a>
|
||
|
|
|
||
|
|
<div class="summary"><p>Reads the next columns and returns a tuple of the values.</p></div>
|
||
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|
||
|
|
</li>
|
||
|
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|
||
|
|
</ul>
|
||
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|
||
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|
||
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|
||
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|
||
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|
||
|
|
<div class="methods-inherited">
|
||
|
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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">
|
||
|
|
<span>close</span>
|
||
|
|
close</a>,
|
||
|
|
|
||
|
|
|
||
|
|
<a href="../DB/Disposable.html#closed%3F-instance-method" class="tooltip">
|
||
|
|
<span>closed?</span>
|
||
|
|
closed?</a>
|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
|
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
|
|
|
||
|
|
</div>
|
||
|
|
|
||
|
|
|
||
|
|
<h2>Constructor Detail</h2>
|
||
|
|
|
||
|
|
<div class="entry-detail" id="new(statement:DB::Statement)-class-method">
|
||
|
|
<div class="signature">
|
||
|
|
|
||
|
|
def self.<strong>new</strong>(statement : <a href="../DB/Statement.html">DB::Statement</a>)
|
||
|
|
|
||
|
|
<a class="method-permalink" href="#new%28statement%3ADB%3A%3AStatement%29-class-method">#</a>
|
||
|
|
</div>
|
||
|
|
|
||
|
|
<br/>
|
||
|
|
<div>
|
||
|
|
|
||
|
|
[<a href="https://github.com/crystal-lang/crystal-db/blob/437f8c39eccc82628223eff965d740fd3389499a/src/db/result_set.cr#L28" target="_blank">View source</a>]
|
||
|
|
|
||
|
|
</div>
|
||
|
|
</div>
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
<h2>Instance Method Detail</h2>
|
||
|
|
|
||
|
|
<div class="entry-detail" id="column_count:Int32-instance-method">
|
||
|
|
<div class="signature">
|
||
|
|
abstract
|
||
|
|
def <strong>column_count</strong> : Int32
|
||
|
|
|
||
|
|
<a class="method-permalink" href="#column_count%3AInt32-instance-method">#</a>
|
||
|
|
</div>
|
||
|
|
|
||
|
|
<div class="doc"><p>Returns the number of columns in the result</p></div>
|
||
|
|
|
||
|
|
<br/>
|
||
|
|
<div>
|
||
|
|
|
||
|
|
[<a href="https://github.com/crystal-lang/crystal-db/blob/437f8c39eccc82628223eff965d740fd3389499a/src/db/result_set.cr#L59" target="_blank">View source</a>]
|
||
|
|
|
||
|
|
</div>
|
||
|
|
</div>
|
||
|
|
|
||
|
|
<div class="entry-detail" id="column_name(index:Int32):String-instance-method">
|
||
|
|
<div class="signature">
|
||
|
|
abstract
|
||
|
|
def <strong>column_name</strong>(index : Int32) : String
|
||
|
|
|
||
|
|
<a class="method-permalink" href="#column_name%28index%3AInt32%29%3AString-instance-method">#</a>
|
||
|
|
</div>
|
||
|
|
|
||
|
|
<div class="doc"><p>Returns the name of the column in <code>index</code> 0-based position.</p></div>
|
||
|
|
|
||
|
|
<br/>
|
||
|
|
<div>
|
||
|
|
|
||
|
|
[<a href="https://github.com/crystal-lang/crystal-db/blob/437f8c39eccc82628223eff965d740fd3389499a/src/db/result_set.cr#L62" target="_blank">View source</a>]
|
||
|
|
|
||
|
|
</div>
|
||
|
|
</div>
|
||
|
|
|
||
|
|
<div class="entry-detail" id="column_names-instance-method">
|
||
|
|
<div class="signature">
|
||
|
|
|
||
|
|
def <strong>column_names</strong>
|
||
|
|
|
||
|
|
<a class="method-permalink" href="#column_names-instance-method">#</a>
|
||
|
|
</div>
|
||
|
|
|
||
|
|
<div class="doc"><p>Returns the name of the columns.</p></div>
|
||
|
|
|
||
|
|
<br/>
|
||
|
|
<div>
|
||
|
|
|
||
|
|
[<a href="https://github.com/crystal-lang/crystal-db/blob/437f8c39eccc82628223eff965d740fd3389499a/src/db/result_set.cr#L65" target="_blank">View source</a>]
|
||
|
|
|
||
|
|
</div>
|
||
|
|
</div>
|
||
|
|
|
||
|
|
<div class="entry-detail" id="each(&block)-instance-method">
|
||
|
|
<div class="signature">
|
||
|
|
|
||
|
|
def <strong>each</strong>(&block)
|
||
|
|
|
||
|
|
<a class="method-permalink" href="#each%28%26block%29-instance-method">#</a>
|
||
|
|
</div>
|
||
|
|
|
||
|
|
<div class="doc"><p>Iterates over all the rows</p></div>
|
||
|
|
|
||
|
|
<br/>
|
||
|
|
<div>
|
||
|
|
|
||
|
|
[<a href="https://github.com/crystal-lang/crystal-db/blob/437f8c39eccc82628223eff965d740fd3389499a/src/db/result_set.cr#L38" target="_blank">View source</a>]
|
||
|
|
|
||
|
|
</div>
|
||
|
|
</div>
|
||
|
|
|
||
|
|
<div class="entry-detail" id="each_column(&block)-instance-method">
|
||
|
|
<div class="signature">
|
||
|
|
|
||
|
|
def <strong>each_column</strong>(&block)
|
||
|
|
|
||
|
|
<a class="method-permalink" href="#each_column%28%26block%29-instance-method">#</a>
|
||
|
|
</div>
|
||
|
|
|
||
|
|
<div class="doc"><p>Iterates over all the columns</p></div>
|
||
|
|
|
||
|
|
<br/>
|
||
|
|
<div>
|
||
|
|
|
||
|
|
[<a href="https://github.com/crystal-lang/crystal-db/blob/437f8c39eccc82628223eff965d740fd3389499a/src/db/result_set.cr#L45" target="_blank">View source</a>]
|
||
|
|
|
||
|
|
</div>
|
||
|
|
</div>
|
||
|
|
|
||
|
|
<div class="entry-detail" id="move_next:Bool-instance-method">
|
||
|
|
<div class="signature">
|
||
|
|
abstract
|
||
|
|
def <strong>move_next</strong> : Bool
|
||
|
|
|
||
|
|
<a class="method-permalink" href="#move_next%3ABool-instance-method">#</a>
|
||
|
|
</div>
|
||
|
|
|
||
|
|
<div class="doc"><p>Move the next row in the result.
|
||
|
|
Return <code>false</code> if no more rows are available.
|
||
|
|
See <code><a href="../DB/ResultSet.html#each%28%26block%29-instance-method">#each</a></code></p></div>
|
||
|
|
|
||
|
|
<br/>
|
||
|
|
<div>
|
||
|
|
|
||
|
|
[<a href="https://github.com/crystal-lang/crystal-db/blob/437f8c39eccc82628223eff965d740fd3389499a/src/db/result_set.cr#L54" target="_blank">View source</a>]
|
||
|
|
|
||
|
|
</div>
|
||
|
|
</div>
|
||
|
|
|
||
|
|
<div class="entry-detail" id="read(type:DB::Mappable.class)-instance-method">
|
||
|
|
<div class="signature">
|
||
|
|
|
||
|
|
def <strong>read</strong>(type : DB::Mappable.class)
|
||
|
|
|
||
|
|
<a class="method-permalink" href="#read%28type%3ADB%3A%3AMappable.class%29-instance-method">#</a>
|
||
|
|
</div>
|
||
|
|
|
||
|
|
<div class="doc"><p>Reads the next columns and maps them to a class</p></div>
|
||
|
|
|
||
|
|
<br/>
|
||
|
|
<div>
|
||
|
|
|
||
|
|
[<a href="https://github.com/crystal-lang/crystal-db/blob/437f8c39eccc82628223eff965d740fd3389499a/src/db/result_set.cr#L73" target="_blank">View source</a>]
|
||
|
|
|
||
|
|
</div>
|
||
|
|
</div>
|
||
|
|
|
||
|
|
<div class="entry-detail" id="read(type:T.class):TforallT-instance-method">
|
||
|
|
<div class="signature">
|
||
|
|
|
||
|
|
def <strong>read</strong>(type : T.class) : T forall T
|
||
|
|
|
||
|
|
<a class="method-permalink" href="#read%28type%3AT.class%29%3ATforallT-instance-method">#</a>
|
||
|
|
</div>
|
||
|
|
|
||
|
|
<div class="doc"><p>Reads the next column value as a <strong>type</strong></p></div>
|
||
|
|
|
||
|
|
<br/>
|
||
|
|
<div>
|
||
|
|
|
||
|
|
[<a href="https://github.com/crystal-lang/crystal-db/blob/437f8c39eccc82628223eff965d740fd3389499a/src/db/result_set.cr#L78" target="_blank">View source</a>]
|
||
|
|
|
||
|
|
</div>
|
||
|
|
</div>
|
||
|
|
|
||
|
|
<div class="entry-detail" id="read-instance-method">
|
||
|
|
<div class="signature">
|
||
|
|
abstract
|
||
|
|
def <strong>read</strong>
|
||
|
|
|
||
|
|
<a class="method-permalink" href="#read-instance-method">#</a>
|
||
|
|
</div>
|
||
|
|
|
||
|
|
<div class="doc"><p>Reads the next column value</p></div>
|
||
|
|
|
||
|
|
<br/>
|
||
|
|
<div>
|
||
|
|
|
||
|
|
[<a href="https://github.com/crystal-lang/crystal-db/blob/437f8c39eccc82628223eff965d740fd3389499a/src/db/result_set.cr#L70" target="_blank">View source</a>]
|
||
|
|
|
||
|
|
</div>
|
||
|
|
</div>
|
||
|
|
|
||
|
|
<div class="entry-detail" id="read(*types:Class)-instance-method">
|
||
|
|
<div class="signature">
|
||
|
|
|
||
|
|
def <strong>read</strong>(*types : Class)
|
||
|
|
|
||
|
|
<a class="method-permalink" href="#read%28%2Atypes%3AClass%29-instance-method">#</a>
|
||
|
|
</div>
|
||
|
|
|
||
|
|
<div class="doc"><p>Reads the next columns and returns a tuple of the values.</p></div>
|
||
|
|
|
||
|
|
<br/>
|
||
|
|
<div>
|
||
|
|
|
||
|
|
[<a href="https://github.com/crystal-lang/crystal-db/blob/437f8c39eccc82628223eff965d740fd3389499a/src/db/result_set.cr#L88" target="_blank">View source</a>]
|
||
|
|
|
||
|
|
</div>
|
||
|
|
</div>
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
</div>
|
||
|
|
|
||
|
|
</body>
|
||
|
|
</html>
|