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db
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0.10.1
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<li class=" " data-id="db/DB/Field" data-name="db::field">
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<a href="DB/Field.html">Field</a>
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<li class=" " data-id="db/DB/Mappable" data-name="db::mappable">
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<li class=" " data-id="db/DB/MetadataValueConverter" data-name="db::metadatavalueconverter">
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<a href="DB/MetadataValueConverter.html">MetadataValueConverter</a>
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<li class=" " data-id="db/DB/NoResultsError" data-name="db::noresultserror">
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<a href="DB/Pool.html">Pool</a>
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<li class=" " data-id="db/DB/PoolStatement" data-name="db::poolstatement">
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<a href="DB/PoolStatement.html">PoolStatement</a>
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<li class=" " data-id="db/DB/PoolTimeout" data-name="db::pooltimeout">
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<a href="DB/PoolTimeout.html">PoolTimeout</a>
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<a href="DB/PoolUnpreparedStatement.html">PoolUnpreparedStatement</a>
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<li class=" " data-id="db/DB/QueryMethods" data-name="db::querymethods(stmt)">
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<a href="DB/QueryMethods.html">QueryMethods</a>
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<a href="DB/Rollback.html">Rollback</a>
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<li class=" " data-id="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="db/DB/Serializable" data-name="db::serializable">
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<a href="DB/Serializable.html">Serializable</a>
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<ul>
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<li class=" " data-id="db/DB/Serializable/NonStrict" data-name="db::serializable::nonstrict">
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<a href="DB/Serializable/NonStrict.html">NonStrict</a>
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</ul>
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</li>
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<li class="parent " data-id="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="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="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="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="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="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="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="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>
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<div class="main-content">
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<p><a href="https://travis-ci.org/crystal-lang/crystal-db"><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">SQLite</a></li><li><a href="https://github.com/crystal-lang/crystal-mysql">MySQL</a></li><li><a href="https://github.com/will/crystal-pg">PostgreSQL</a></li><li><a href="https://github.com/kaukas/crystal-cassandra">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/">Latest API</a></li><li><a href="https://crystal-lang.org/docs/database/">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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<span class="k">require</span> <span class="s">"sqlite3"</span>
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<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>
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<span class="c"># When using the pg driver, use $1, $2, etc. instead of ?</span>
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db.exec <span class="s">"create table contacts (name text, age integer)"</span>
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db.exec <span class="s">"insert into contacts values (?, ?)"</span>, <span class="s">"John Doe"</span>, <span class="n">30</span>
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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>
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args <span class="o"><<</span> <span class="s">"Sarah"</span>
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args <span class="o"><<</span> <span class="n">33</span>
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db.exec <span class="s">"insert into contacts values (?, ?)"</span>, args: args
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puts <span class="s">"max age:"</span>
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puts db.scalar <span class="s">"select max(age) from contacts"</span> <span class="c"># => 33</span>
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puts <span class="s">"contacts:"</span>
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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>
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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>
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<span class="c"># => name (age)</span>
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rs.each <span class="k">do</span>
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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>
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<span class="c"># => Sarah (33)</span>
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<span class="c"># => John Doe (30)</span>
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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">end</span></code></pre>
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<h2><a id="roadmap" class="anchor" href="#roadmap">
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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>Roadmap</h2>
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<p>Issues not yet addressed:</p>
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<ul><li>[x] Support non prepared statements. <a href="https://github.com/crystal-lang/crystal-db/pull/25">#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">#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>
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<h2><a id="contributing" class="anchor" href="#contributing">
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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>Contributing</h2>
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<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>
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<h2><a id="contributors" class="anchor" href="#contributors">
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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>Contributors</h2>
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<ul><li><a href="https://github.com/bcardiff">bcardiff</a> Brian J. Cardiff - creator, maintainer</li></ul>
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</div>
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</body>
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</html>
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