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db
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0.13.1
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<li class=" " data-id="db/DB/StringKeyCache" data-name="db::stringkeycache(t)">
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<a href="../Enum.html">Enum</a>
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<div class="main-content">
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<h1 class="type-name">
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<span class="kind">abstract class</span> DB::<wbr>Statement
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</h1>
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<ul class="superclass-hierarchy"><li class="superclass"><a href="../DB/Statement.html">DB::Statement</a></li><li class="superclass">Reference</li><li class="superclass">Object</li></ul>
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<h2>
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<a id="overview" class="anchor" href="#overview">
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<svg class="octicon-link" aria-hidden="true">
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<use href="#octicon-link"/>
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</svg>
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</a>
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Overview
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</h2>
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<p>Represents a query in a <code><a href="../DB/Connection.html">Connection</a></code>.
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It should be created by <code><a href="../DB/QueryMethods.html">QueryMethods</a></code>.</p>
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<h3><a id="note-to-implementors" class="anchor" href="#note-to-implementors">
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<svg class="octicon-link" aria-hidden="true">
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<use href="#octicon-link"/>
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</svg>
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</a>Note to implementors</h3>
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<ol>
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<li>Subclass <code>Statements</code></li>
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<li><code>Statements</code> are created from a custom driver <code>Connection#prepare</code> method.</li>
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<li><code>#perform_query</code> executes a query that is expected to return a <code><a href="../DB/ResultSet.html">ResultSet</a></code></li>
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<li><code>#perform_exec</code> executes a query that is expected to return an <code><a href="../DB/ExecResult.html">ExecResult</a></code></li>
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<li><code>#do_close</code> is called to release the statement resources.</li>
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</ol>
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<h2>
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<a id="included-modules" class="anchor" href="#included-modules">
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<svg class="octicon-link" aria-hidden="true">
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<use href="#octicon-link"/>
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</svg>
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</a>
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Included Modules
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</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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<li class="other-type"><a href="../DB/StatementMethods.html">DB::StatementMethods</a></li>
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</ul>
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<h2>
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<a id="defined-in" class="anchor" href="#defined-in">
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<svg class="octicon-link" aria-hidden="true">
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<use href="#octicon-link"/>
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</svg>
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</a>
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Defined in:
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</h2>
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<a href="https://github.com/crystal-lang/crystal-db/blob/v0.13.1/src/db/statement.cr#L43" target="_blank">
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db/statement.cr
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</a>
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<br/>
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<h2>
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<a id="constructors" class="anchor" href="#constructors">
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<svg class="octicon-link" aria-hidden="true">
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<use href="#octicon-link"/>
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</svg>
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</a>
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Constructors
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</h2>
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<ul class="list-summary">
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<li class="entry-summary">
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<a href="#new%28connection%3AConnection%2Ccommand%3AString%29-class-method" class="signature"><strong>.new</strong>(connection : Connection, command : String)</a>
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</li>
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</ul>
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<h2>
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<a id="instance-method-summary" class="anchor" href="#instance-method-summary">
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<svg class="octicon-link" aria-hidden="true">
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<use href="#octicon-link"/>
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</svg>
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</a>
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Instance Method Summary
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</h2>
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<ul class="list-summary">
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<li class="entry-summary">
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<a href="#command%3AString-instance-method" class="signature"><strong>#command</strong> : String</a>
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</li>
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<li class="entry-summary">
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<a href="#exec%3ADB%3A%3AExecResult-instance-method" class="signature"><strong>#exec</strong> : DB::ExecResult</a>
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<div class="summary"><p>See <code><a href="../DB/QueryMethods.html#exec%28query%2C%2Aargs_%2Cargs%3AArray%7CNil%3Dnil%29-instance-method">QueryMethods#exec</a></code></p></div>
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</li>
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<li class="entry-summary">
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<a href="#exec%28%2Aargs_%2Cargs%3AArray%7CNil%3Dnil%29%3ADB%3A%3AExecResult-instance-method" class="signature"><strong>#exec</strong>(*args_, args : Array | Nil = <span class="n">nil</span>) : DB::ExecResult</a>
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<div class="summary"><p>See <code><a href="../DB/QueryMethods.html#exec%28query%2C%2Aargs_%2Cargs%3AArray%7CNil%3Dnil%29-instance-method">QueryMethods#exec</a></code></p></div>
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</li>
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<li class="entry-summary">
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<a href="#query%3ADB%3A%3AResultSet-instance-method" class="signature"><strong>#query</strong> : DB::ResultSet</a>
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<div class="summary"><p>See <code><a href="../DB/QueryMethods.html#query%28query%2C%2Aargs_%2Cargs%3AArray%7CNil%3Dnil%29-instance-method">QueryMethods#query</a></code></p></div>
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</li>
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<li class="entry-summary">
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<a href="#query%28%2Aargs_%2Cargs%3AArray%7CNil%3Dnil%29%3ADB%3A%3AResultSet-instance-method" class="signature"><strong>#query</strong>(*args_, args : Array | Nil = <span class="n">nil</span>) : DB::ResultSet</a>
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<div class="summary"><p>See <code><a href="../DB/QueryMethods.html#query%28query%2C%2Aargs_%2Cargs%3AArray%7CNil%3Dnil%29-instance-method">QueryMethods#query</a></code></p></div>
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</li>
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<li class="entry-summary">
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<a href="#release_connection-instance-method" class="signature"><strong>#release_connection</strong></a>
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</li>
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</ul>
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<h2>
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<a id="macro-summary" class="anchor" href="#macro-summary">
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<svg class="octicon-link" aria-hidden="true">
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<use href="#octicon-link"/>
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</svg>
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</a>
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Macro Summary
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</h2>
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<ul class="list-summary">
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<li class="entry-summary">
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<a href="#def_around_query_or_exec%28%26block%29-macro" class="signature"><strong>def_around_query_or_exec</strong>(&block)</a>
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<div class="summary"><p>This macro allows injecting code to be run before and after the execution of the request.</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/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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<h3>Instance methods inherited from module <code><a href="../DB/StatementMethods.html">DB::StatementMethods</a></code></h3>
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<a href="../DB/StatementMethods.html#exec%3AExecResult-instance-method" class="tooltip">
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<span>exec : ExecResult<br/>exec(*args_, args : Array | Nil = <span class="n">nil</span>) : ExecResult</span>
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exec</a>,
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<a href="../DB/StatementMethods.html#query%28%2Aargs_%2Cargs%3AArray%7CNil%3Dnil%2C%26%29-instance-method" class="tooltip">
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<span>query(*args_, args : Array | Nil = <span class="n">nil</span>, &)<br/>query : ResultSet<br/>query(*args_, args : Array | Nil = <span class="n">nil</span>) : ResultSet</span>
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query</a>,
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<a href="../DB/StatementMethods.html#scalar%28%2Aargs_%2Cargs%3AArray%7CNil%3Dnil%29-instance-method" class="tooltip">
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<span>scalar(*args_, args : Array | Nil = <span class="n">nil</span>)</span>
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scalar</a>
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</div>
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<h2>
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<a id="constructor-detail" class="anchor" href="#constructor-detail">
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<svg class="octicon-link" aria-hidden="true">
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<use href="#octicon-link"/>
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</svg>
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</a>
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Constructor Detail
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</h2>
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<div class="entry-detail" id="new(connection:Connection,command:String)-class-method">
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<div class="signature">
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def self.<strong>new</strong>(connection : <a href="../DB/Connection.html">Connection</a>, command : String)
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<a class="method-permalink" href="#new%28connection%3AConnection%2Ccommand%3AString%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/v0.13.1/src/db/statement.cr#L55" target="_blank">View source</a>]
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</div>
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</div>
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<h2>
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<a id="instance-method-detail" class="anchor" href="#instance-method-detail">
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<svg class="octicon-link" aria-hidden="true">
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<use href="#octicon-link"/>
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</svg>
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</a>
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Instance Method Detail
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</h2>
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<div class="entry-detail" id="command:String-instance-method">
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<div class="signature">
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def <strong>command</strong> : String
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<a class="method-permalink" href="#command%3AString-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/v0.13.1/src/db/statement.cr#L53" target="_blank">View source</a>]
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</div>
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</div>
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<div class="entry-detail" id="exec:DB::ExecResult-instance-method">
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<div class="signature">
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def <strong>exec</strong> : <a href="../DB/ExecResult.html">DB::ExecResult</a>
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<a class="method-permalink" href="#exec%3ADB%3A%3AExecResult-instance-method">#</a>
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</div>
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<div class="doc">
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<p>See <code><a href="../DB/QueryMethods.html#exec%28query%2C%2Aargs_%2Cargs%3AArray%7CNil%3Dnil%29-instance-method">QueryMethods#exec</a></code></p>
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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/v0.13.1/src/db/statement.cr#L72" target="_blank">View source</a>]
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</div>
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</div>
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<div class="entry-detail" id="exec(*args_,args:Array|Nil=nil):DB::ExecResult-instance-method">
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<div class="signature">
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def <strong>exec</strong>(*args_, args : Array | Nil = <span class="n">nil</span>) : <a href="../DB/ExecResult.html">DB::ExecResult</a>
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<a class="method-permalink" href="#exec%28%2Aargs_%2Cargs%3AArray%7CNil%3Dnil%29%3ADB%3A%3AExecResult-instance-method">#</a>
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</div>
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<div class="doc">
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<p>See <code><a href="../DB/QueryMethods.html#exec%28query%2C%2Aargs_%2Cargs%3AArray%7CNil%3Dnil%29-instance-method">QueryMethods#exec</a></code></p>
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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/v0.13.1/src/db/statement.cr#L77" target="_blank">View source</a>]
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</div>
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</div>
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<div class="entry-detail" id="query:DB::ResultSet-instance-method">
|
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<div class="signature">
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def <strong>query</strong> : <a href="../DB/ResultSet.html">DB::ResultSet</a>
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<a class="method-permalink" href="#query%3ADB%3A%3AResultSet-instance-method">#</a>
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</div>
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<div class="doc">
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<p>See <code><a href="../DB/QueryMethods.html#query%28query%2C%2Aargs_%2Cargs%3AArray%7CNil%3Dnil%29-instance-method">QueryMethods#query</a></code></p>
|
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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/v0.13.1/src/db/statement.cr#L82" target="_blank">View source</a>]
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</div>
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</div>
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<div class="entry-detail" id="query(*args_,args:Array|Nil=nil):DB::ResultSet-instance-method">
|
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<div class="signature">
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def <strong>query</strong>(*args_, args : Array | Nil = <span class="n">nil</span>) : <a href="../DB/ResultSet.html">DB::ResultSet</a>
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<a class="method-permalink" href="#query%28%2Aargs_%2Cargs%3AArray%7CNil%3Dnil%29%3ADB%3A%3AResultSet-instance-method">#</a>
|
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</div>
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<div class="doc">
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<p>See <code><a href="../DB/QueryMethods.html#query%28query%2C%2Aargs_%2Cargs%3AArray%7CNil%3Dnil%29-instance-method">QueryMethods#query</a></code></p>
|
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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/v0.13.1/src/db/statement.cr#L87" 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_connection-instance-method">
|
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<div class="signature">
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|
|
def <strong>release_connection</strong>
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|
|
<a class="method-permalink" href="#release_connection-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/v0.13.1/src/db/statement.cr#L67" target="_blank">View source</a>]
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</div>
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</div>
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<h2>
|
|
<a id="macro-detail" class="anchor" href="#macro-detail">
|
|
<svg class="octicon-link" aria-hidden="true">
|
|
<use href="#octicon-link"/>
|
|
</svg>
|
|
</a>
|
|
Macro Detail
|
|
</h2>
|
|
|
|
<div class="entry-detail" id="def_around_query_or_exec(&block)-macro">
|
|
<div class="signature">
|
|
|
|
macro <strong>def_around_query_or_exec</strong>(&block)
|
|
|
|
<a class="method-permalink" href="#def_around_query_or_exec%28%26block%29-macro">#</a>
|
|
</div>
|
|
|
|
<div class="doc">
|
|
|
|
<p>This macro allows injecting code to be run before and after the execution
|
|
of the request. It should return the yielded value. It must be called with 1
|
|
block argument that will be used to pass the <code>args : Enumerable</code>.</p>
|
|
<pre><code class="language-crystal"><span class="k">class</span> <span class="t">DB</span><span class="t">::</span><span class="t">Statement</span>
|
|
def_around_query_or_exec <span class="k">do</span> <span class="o">|</span>args<span class="o">|</span>
|
|
<span class="c"># do something before query or exec</span>
|
|
res <span class="o">=</span> <span class="k">yield</span>
|
|
<span class="c"># do something after query or exec</span>
|
|
res
|
|
<span class="k">end</span>
|
|
<span class="k">end</span></code></pre>
|
|
</div>
|
|
|
|
<br/>
|
|
<div>
|
|
|
|
[<a href="https://github.com/crystal-lang/crystal-db/blob/v0.13.1/src/db/statement.cr#L134" 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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