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H2 Database Engine
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<div style="width:660px; margin:0 auto;">
<h1>H2 Database Engine Cheat Sheet</h1>
<div style="float:left; margin:5px; width:320px;">
<h2>Using H2</h2>
<ul><li>Download the
<a href="http://repo1.maven.org/maven2/com/h2database/h2/1.1.111/h2-1.1.111.jar">jar file</a>,
<a href="http://www.h2database.com/h2-setup-2009-04-10.exe">Windows installer</a>, or
<a href="http://www.h2database.com/h2-2009-04-10.zip">zip file</a>.
</li><li>To start the H2 Console tool, double click the jar file, or run <code>java -jar h2*.jar</code>, <code>h2.bat</code> or <code>h2.sh</code>.
</li><li>A new database is automatically created if it does not yet exist.
</li><li>Closing the last connection closes a database.
</li><li>H2 is open source, free to use and distribute.
</li></ul>
<h2>Database URLs</h2>
<p>
<b>Embedded</b><br />
<code>jdbc:h2:~/test</code> 'test' in the user home directory<br />
<code>jdbc:h2:/data/test</code> 'test' in the directory /data/<br />
<code>jdbc:h2:test</code> in the current(!) working dir<br />
</p><p>
<b>In-Memory</b><br />
<code>jdbc:h2:mem:test</code> multiple connections in one process<br />
<code>jdbc:h2:mem:</code> unnamed private database; one connection<br />
</p><p>
<b>Server Mode</b><br />
<code>jdbc:h2:tcp://localhost/~/test</code> user home dir<br />
<code>jdbc:h2:tcp://localhost//data/test</code> absolute dir<br />
</p><p>
<b>Settings</b><br />
<code>jdbc:h2:..;MODE=MySQL</code> compatibility (or HSQLDB,...)<br />
<code>jdbc:h2:..;TRACE_LEVEL_FILE=3</code> log to .trace.db<br />
<p>
<h2>Documentation</h2>
Reference:
<a href="http://www.h2database.com/html/grammar.html">SQL grammar</a>,
<a href="http://www.h2database.com/html/functions.html">functions</a>,
<a href="http://www.h2database.com/html/datatypes.html">data types</a>,
<a href="http://www.h2database.com/html/datatypes.html">tools</a>.
<br />
Features:
<a href="http://www.h2database.com/html/grammar.html">fulltext search</a>,
<a href="http://www.h2database.com/html/functions.html">database encryption</a>,
<a href="http://www.h2database.com/html/datatypes.html">read-only databases</a>
<a href="http://www.h2database.com/html/datatypes.html">(in a zip or jar file)</a>,
<a href="http://www.h2database.com/html/datatypes.html">CSV files</a>,
<br />
</div>
<div style="float:right; padding:5px; width:320px;">
<h2>Using the JDBC API</h2>
<pre>
Class.forName("org.h2.Driver");
Connection conn = DriverManager.
getConnection("jdbc:h2:~/test");
conn.close();
</pre>
<h2>Connection Pool</h2>
<pre>
import org.h2.jdbcx.JdbcConnectionPool;
DataSource cp = JdbcConnectionPool.
create("jdbc:h2:~/test");
Connection conn = cp.getConnection();
conn.close(); cp.dispose();
</pre>
<h2>Start a Server</h2>
<pre>
java -cp h2*.jar org.h2.tools.Server
</pre>
<h2>Hibernate</h2>
In the file hibernate.cfg.xml, set:
<pre>
<property name="dialect">
org.hibernate.dialect.H2Dialect
</property>
</pre>
As an alternative, use the HSQLDialect.
<h2>Maven</h2>
<pre>
<dependency>
<groupId>com.h2database</groupId>
<artifactId>h2</artifactId>
<version>${version}</version>
</dependency>
</pre>
<h2>TopLink and Glassfish</h2>
Datasource Classname: org.h2.jdbcx.JdbcDataSource
toplink.target-database: oracle.toplink.essentials.platform.database.H2Platform
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