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db
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<a href="DB/Pool.html">Pool</a>
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<a href="DB/PoolResourceLost.html">PoolResourceLost</a>
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<li class=" " data-id="db/DB/Rollback" data-name="db::rollback">
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<a href="DB/Statement.html">Statement</a>
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<li class=" " data-id="db/DB/TopLevelTransaction" data-name="db::topleveltransaction">
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<a href="DB/TopLevelTransaction.html">TopLevelTransaction</a>
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<li class=" " data-id="db/DB/Transaction" data-name="db::transaction">
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<a href="DB/Transaction.html">Transaction</a>
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</div>
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<div class="main-content">
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<p><a href="https://travis-ci.org/crystal-lang/crystal-db" target="_blank"><img src="https://travis-ci.org/crystal-lang/crystal-db.svg?branch=master" alt="Build Status"/></a></p>
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<h1><a id="crystal-db" class="anchor" href="#crystal-db">
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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>crystal-db</h1>
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<p>Common db api for crystal. You will need to have a specific driver to access a database.</p>
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<ul><li><a href="https://github.com/crystal-lang/crystal-sqlite3" target="_blank">SQLite</a></li><li><a href="https://github.com/crystal-lang/crystal-mysql" target="_blank">MySQL</a></li><li><a href="https://github.com/will/crystal-pg" target="_blank">PostgreSQL</a></li><li><a href="https://github.com/kaukas/crystal-cassandra" target="_blank">Cassandra</a></li></ul>
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<h2><a id="installation" class="anchor" href="#installation">
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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>Installation</h2>
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<p>If you are creating a shard that will work with <em>any</em> driver, then add <code>crystal-db</code> as a dependency in <code>shard.yml</code>:</p>
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<pre><code class="language-yaml">dependencies:
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db:
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github: crystal-lang/crystal-db</code></pre>
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<p>If you are creating an application that will work with <em>some specific</em> driver(s), then add them in <code>shard.yml</code>:</p>
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<pre><code class="language-yaml">dependencies:
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sqlite3:
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github: crystal-lang/crystal-sqlite3</code></pre>
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<p><code>crystal-db</code> itself will be a nested dependency if drivers are included.</p>
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<p>Note: Multiple drivers can be included in the same application.</p>
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<h2><a id="documentation" class="anchor" href="#documentation">
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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>Documentation</h2>
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<ul><li><a href="http://crystal-lang.github.io/crystal-db/api/latest/" target="_blank">Latest API</a></li><li><a href="https://crystal-lang.org/docs/database/" target="_blank">Crystal book</a></li></ul>
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<h2><a id="usage" class="anchor" href="#usage">
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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>Usage</h2>
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<p>This shard only provides an abstract database API. In order to use it, a specific driver for the intended database has to be required as well:</p>
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<p>The following example uses SQLite where <code>?</code> indicates the arguments. If PostgreSQL is used <code>$1</code>, <code>$2</code>, etc. should be used. <code>crystal-db</code> does not interpret the statements.</p>
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<pre><code class="language-crystal"><span class="k">require</span> <span class="s">"db"</span>
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|
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<span class="k">require</span> <span class="s">"sqlite3"</span>
|
||
|
|
|
||
|
|
<span class="t">DB</span>.open <span class="s">"sqlite3:./file.db"</span> <span class="k">do</span> <span class="o">|</span>db<span class="o">|</span>
|
||
|
|
<span class="c"># When using the pg driver, use $1, $2, etc. instead of ?</span>
|
||
|
|
db.exec <span class="s">"create table contacts (name text, age integer)"</span>
|
||
|
|
db.exec <span class="s">"insert into contacts values (?, ?)"</span>, <span class="s">"John Doe"</span>, <span class="n">30</span>
|
||
|
|
|
||
|
|
args <span class="o">=</span> <span class="o">[]</span> <span class="k">of</span> <span class="t">DB</span><span class="t">::</span><span class="t">Any</span>
|
||
|
|
args <span class="o"><<</span> <span class="s">"Sarah"</span>
|
||
|
|
args <span class="o"><<</span> <span class="n">33</span>
|
||
|
|
db.exec <span class="s">"insert into contacts values (?, ?)"</span>, args: args
|
||
|
|
|
||
|
|
puts <span class="s">"max age:"</span>
|
||
|
|
puts db.scalar <span class="s">"select max(age) from contacts"</span> <span class="c"># => 33</span>
|
||
|
|
|
||
|
|
puts <span class="s">"contacts:"</span>
|
||
|
|
db.query <span class="s">"select name, age from contacts order by age desc"</span> <span class="k">do</span> <span class="o">|</span>rs<span class="o">|</span>
|
||
|
|
puts <span class="s">"</span><span class="i">#{</span>rs.column_name(<span class="n">0</span>)<span class="i">}</span><span class="s"> (</span><span class="i">#{</span>rs.column_name(<span class="n">1</span>)<span class="i">}</span><span class="s">)"</span>
|
||
|
|
<span class="c"># => name (age)</span>
|
||
|
|
rs.each <span class="k">do</span>
|
||
|
|
puts <span class="s">"</span><span class="i">#{</span>rs.read(<span class="t">String</span>)<span class="i">}</span><span class="s"> (</span><span class="i">#{</span>rs.read(<span class="t">Int32</span>)<span class="i">}</span><span class="s">)"</span>
|
||
|
|
<span class="c"># => Sarah (33)</span>
|
||
|
|
<span class="c"># => John Doe (30)</span>
|
||
|
|
<span class="k">end</span>
|
||
|
|
<span class="k">end</span>
|
||
|
|
<span class="k">end</span></code></pre>
|
||
|
|
|
||
|
|
<h2><a id="roadmap" class="anchor" href="#roadmap">
|
||
|
|
<svg class="octicon-link" aria-hidden="true">
|
||
|
|
<use href="#octicon-link"/>
|
||
|
|
</svg>
|
||
|
|
</a>Roadmap</h2>
|
||
|
|
|
||
|
|
<p>Issues not yet addressed:</p>
|
||
|
|
|
||
|
|
<ul><li>[x] Support non prepared statements. <a href="https://github.com/crystal-lang/crystal-db/pull/25" target="_blank">#25</a></li><li>[x] Time data type. (implementation details depends on actual drivers)</li><li>[x] Data type extensibility. Allow each driver to extend the data types allowed.</li><li>[x] Transactions & nested transactions. <a href="https://github.com/crystal-lang/crystal-db/pull/27" target="_blank">#27</a></li><li>[x] Connection pool.</li><li>[ ] Logging</li><li>[ ] Direct access to <code>IO</code> to avoid memory allocation for blobs.</li></ul>
|
||
|
|
|
||
|
|
<h2><a id="contributing" class="anchor" href="#contributing">
|
||
|
|
<svg class="octicon-link" aria-hidden="true">
|
||
|
|
<use href="#octicon-link"/>
|
||
|
|
</svg>
|
||
|
|
</a>Contributing</h2>
|
||
|
|
|
||
|
|
<ol><li>Fork it ( https://github.com/crystal-lang/crystal-db/fork )</li><li>Create your feature branch (git checkout -b my-new-feature)</li><li>Commit your changes (git commit -am 'Add some feature')</li><li>Push to the branch (git push origin my-new-feature)</li><li>Create a new Pull Request</li></ol>
|
||
|
|
|
||
|
|
<h2><a id="contributors" class="anchor" href="#contributors">
|
||
|
|
<svg class="octicon-link" aria-hidden="true">
|
||
|
|
<use href="#octicon-link"/>
|
||
|
|
</svg>
|
||
|
|
</a>Contributors</h2>
|
||
|
|
|
||
|
|
<ul><li><a href="https://github.com/bcardiff" target="_blank">bcardiff</a> Brian J. Cardiff - creator, maintainer</li></ul>
|
||
|
|
</div>
|
||
|
|
</body>
|
||
|
|
</html>
|