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559 lines
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db
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<li class=" " data-id="db/DB/SessionMethods/PreparedQuery" data-name="db::sessionmethods::preparedquery(session, stmt)">
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<li class=" " data-id="db/DB/StringKeyCache" data-name="db::stringkeycache(t)">
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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>Driver
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</h1>
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<ul class="superclass-hierarchy"><li class="superclass"><a href="../DB/Driver.html">DB::Driver</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>Database driver implementors must subclass <code><a href="../DB/Driver.html">Driver</a></code>,
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register with a driver_name using <code><a href="../DB.html#register_driver%28driver_name%2Cdriver_class%3ADriver.class%29-class-method">DB#register_driver</a></code> and
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override the factory method <code><a href="../DB/Driver.html#connection_builder%28uri%3AURI%29%3AConnectionBuilder-instance-method">#connection_builder</a></code>.</p>
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<pre><code class="language-crystal"><span class="k">require</span> <span class="s">"db"</span>
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<span class="k">class</span> <span class="t">FakeDriver</span> <span class="o"><</span> <span class="t">DB</span><span class="t">::</span><span class="t">Driver</span>
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<span class="k">class</span> <span class="t">FakeConnectionBuilder</span> <span class="o"><</span> <span class="t">DB</span><span class="t">::</span><span class="t">ConnectionBuilder</span>
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<span class="k">def</span> <span class="m">initialize</span>(@options : <span class="t">DB</span><span class="t">::</span><span class="t">Connection</span><span class="t">::</span><span class="t">Options</span>)
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<span class="k">end</span>
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<span class="k">def</span> <span class="m">build</span> : <span class="t">DB</span><span class="t">::</span><span class="t">Connection</span>
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<span class="t">FakeConnection</span>.new(@options)
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<span class="k">end</span>
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<span class="k">end</span>
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<span class="k">def</span> <span class="m">connection_builder</span>(uri : <span class="t">URI</span>) : <span class="t">ConnectionBuilder</span>
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params <span class="o">=</span> <span class="t">HTTP</span><span class="t">::</span><span class="t">Params</span>.parse(uri.query <span class="o">||</span> <span class="s">""</span>)
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options <span class="o">=</span> connection_options(params)
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<span class="c"># If needed, parse custom options from uri here</span>
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<span class="c"># so they are parsed only once.</span>
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<span class="t">FakeConnectionBuilder</span>.new(options)
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<span class="k">end</span>
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<span class="k">end</span>
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<span class="t">DB</span>.register_driver <span class="s">"fake"</span>, <span class="t">FakeDriver</span></code></pre>
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<p>Access to this fake database will be available with</p>
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<pre><code class="language-crystal"><span class="t">DB</span>.open <span class="s">"fake://..."</span> <span class="k">do</span> <span class="o">|</span>db<span class="o">|</span>
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<span class="c"># ... use db ...</span>
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<span class="k">end</span></code></pre>
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<p>Refer to <code><a href="../DB/Connection.html">Connection</a></code>, <code><a href="../DB/Statement.html">Statement</a></code> and <code><a href="../DB/ResultSet.html">ResultSet</a></code> for further
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driver implementation instructions.</p>
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<p>Override <code><a href="../DB/Driver.html#connection_options%28params%3AHTTP%3A%3AParams%29%3AConnection%3A%3AOptions-instance-method">#connection_options</a></code> and <code><a href="../DB/Driver.html#pool_options%28params%3AHTTP%3A%3AParams%29%3APool%3A%3AOptions-instance-method">#pool_options</a></code> to provide custom
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defaults or parsing of the connection string URI.</p>
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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/driver.cr#L44" target="_blank">
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db/driver.cr
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</a>
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<br/>
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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="#connection_builder%28uri%3AURI%29%3AConnectionBuilder-instance-method" class="signature"><strong>#connection_builder</strong>(uri : URI) : ConnectionBuilder</a>
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<div class="summary"><p>Returns a new connection factory.</p></div>
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</li>
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<li class="entry-summary">
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<a href="#connection_options%28params%3AHTTP%3A%3AParams%29%3AConnection%3A%3AOptions-instance-method" class="signature"><strong>#connection_options</strong>(params : HTTP::Params) : Connection::Options</a>
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</li>
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<li class="entry-summary">
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<a href="#pool_options%28params%3AHTTP%3A%3AParams%29%3APool%3A%3AOptions-instance-method" class="signature"><strong>#pool_options</strong>(params : HTTP::Params) : Pool::Options</a>
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</li>
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</ul>
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<div class="methods-inherited">
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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="connection_builder(uri:URI):ConnectionBuilder-instance-method">
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<div class="signature">
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abstract
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def <strong>connection_builder</strong>(uri : URI) : <a href="../DB/ConnectionBuilder.html">ConnectionBuilder</a>
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<a class="method-permalink" href="#connection_builder%28uri%3AURI%29%3AConnectionBuilder-instance-method">#</a>
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</div>
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<div class="doc">
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<p>Returns a new connection factory.</p>
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<p><span class="flag purple">NOTE</span> For implementors <em>uri</em> should be parsed once. If all the options
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are sound a ConnectionBuilder is returned.</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/driver.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="connection_options(params:HTTP::Params):Connection::Options-instance-method">
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<div class="signature">
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def <strong>connection_options</strong>(params : HTTP::Params) : <a href="../DB/Connection/Options.html">Connection::Options</a>
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<a class="method-permalink" href="#connection_options%28params%3AHTTP%3A%3AParams%29%3AConnection%3A%3AOptions-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/driver.cr#L51" target="_blank">View source</a>]
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</div>
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</div>
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<div class="entry-detail" id="pool_options(params:HTTP::Params):Pool::Options-instance-method">
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<div class="signature">
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def <strong>pool_options</strong>(params : HTTP::Params) : <a href="../DB/Pool/Options.html">Pool::Options</a>
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<a class="method-permalink" href="#pool_options%28params%3AHTTP%3A%3AParams%29%3APool%3A%3AOptions-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/driver.cr#L55" 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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