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Session (Hibernate API Documentation)
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SUMMARY: NESTED | FIELD | CONSTR | <A HREF="#method_summary">METHOD</A></FONT></TD>
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org.hibernate</FONT>
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Interface Session</H2>
<DL>
<DT><B>All Superinterfaces:</B> <DD><A HREF="http://java.sun.com/j2se/1.3/docs/api/java/io/Serializable.html" title="class or interface in java.io">Serializable</A></DD>
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<DT><B>All Known Subinterfaces:</B> <DD><A HREF="../../org/hibernate/event/EventSource.html" title="interface in org.hibernate.event">EventSource</A>, <A HREF="../../org/hibernate/classic/Session.html" title="interface in org.hibernate.classic">Session</A></DD>
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<DT><B>All Known Implementing Classes:</B> <DD><A HREF="../../org/hibernate/impl/SessionImpl.html" title="class in org.hibernate.impl">SessionImpl</A></DD>
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<DT>public interface <B>Session</B><DT>extends <A HREF="http://java.sun.com/j2se/1.3/docs/api/java/io/Serializable.html" title="class or interface in java.io">Serializable</A></DL>
<P>
The main runtime interface between a Java application and Hibernate. This is the central API class abstracting the notion of a persistence service.<br> <br> The lifecycle of a <tt>Session</tt> is bounded by the beginning and end of a logical transaction. (Long transactions might span several database transactions.)<br> <br> The main function of the <tt>Session</tt> is to offer create, read and delete operations for instances of mapped entity classes. Instances may exist in one of three states:<br> <br> <i>transient:</i> never persistent, not associated with any <tt>Session</tt><br> <i>persistent:</i> associated with a unique <tt>Session</tt><br> <i>detached:</i> previously persistent, not associated with any <tt>Session</tt><br> <br> Transient instances may be made persistent by calling <tt>save()</tt>, <tt>persist()</tt> or <tt>saveOrUpdate()</tt>. Persistent instances may be made transient by calling<tt> delete()</tt>. Any instance returned by a <tt>get()</tt> or <tt>load()</tt> method is persistent. Detached instances may be made persistent by calling <tt>update()</tt>, <tt>saveOrUpdate()</tt>, <tt>lock()</tt> or <tt>replicate()</tt>. The state of a transient or detached instance may also be made persistent as a new persistent instance by calling <tt>merge()</tt>.<br> <br> <tt>save()</tt> and <tt>persist()</tt> result in an SQL <tt>INSERT</tt>, <tt>delete()</tt> in an SQL <tt>DELETE</tt> and <tt>update()</tt> or <tt>merge()</tt> in an SQL <tt>UPDATE</tt>. Changes to <i>persistent</i> instances are detected at flush time and also result in an SQL <tt>UPDATE</tt>. <tt>saveOrUpdate()</tt> and <tt>replicate()</tt> result in either an <tt>INSERT</tt> or an <tt>UPDATE</tt>.<br> <br> It is not intended that implementors be threadsafe. Instead each thread/transaction should obtain its own instance from a <tt>SessionFactory</tt>.<br> <br> A <tt>Session</tt> instance is serializable if its persistent classes are serializable.<br> <br> A typical transaction should use the following idiom: <pre> Session sess = factory.openSession(); Transaction tx; try { tx = sess.beginTransaction(); //do some work ... tx.commit(); } catch (Exception e) { if (tx!=null) tx.rollback(); throw e; } finally { sess.close(); } </pre> <br> If the <tt>Session</tt> throws an exception, the transaction must be rolled back and the session discarded. The internal state of the <tt>Session</tt> might not be consistent with the database after the exception occurs.
<P>
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<DL>
<DT><B>Author:</B></DT> <DD>Gavin King</DD><DT><B>See Also:</B><DD><A HREF="../../org/hibernate/SessionFactory.html" title="interface in org.hibernate"><CODE>SessionFactory</CODE></A></DL>
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<B>Method Summary</B></FONT></TD>
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<CODE> <A HREF="../../org/hibernate/Transaction.html" title="interface in org.hibernate">Transaction</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../org/hibernate/Session.html#beginTransaction()">beginTransaction</A></B>()</CODE>
<BR>
Begin a unit of work and return the associated <tt>Transaction</tt> object.</TD>
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<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../org/hibernate/Session.html#cancelQuery()">cancelQuery</A></B>()</CODE>
<BR>
Cancel execution of the current query.</TD>
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<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../org/hibernate/Session.html#clear()">clear</A></B>()</CODE>
<BR>
Completely clear the session.</TD>
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<CODE> <A HREF="http://java.sun.com/j2se/1.3/docs/api/java/sql/Connection.html" title="class or interface in java.sql">Connection</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../org/hibernate/Session.html#close()">close</A></B>()</CODE>
<BR>
End the <tt>Session</tt> by disconnecting from the JDBC connection and cleaning up.</TD>
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<CODE> <A HREF="http://java.sun.com/j2se/1.3/docs/api/java/sql/Connection.html" title="class or interface in java.sql">Connection</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../org/hibernate/Session.html#connection()">connection</A></B>()</CODE>
<BR>
Get the JDBC connection of this Session.<br> <br> If the session is using aggressive collection release (as in a CMT environment), it is the application's responsibility to close the connection returned by this call.</TD>
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<CODE> boolean</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../org/hibernate/Session.html#contains(java.lang.Object)">contains</A></B>(<A HREF="http://java.sun.com/j2se/1.3/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A> object)</CODE>
<BR>
Check if this instance is associated with this <tt>Session</tt>.</TD>
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<CODE> <A HREF="../../org/hibernate/Criteria.html" title="interface in org.hibernate">Criteria</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../org/hibernate/Session.html#createCriteria(java.lang.Class)">createCriteria</A></B>(<A HREF="http://java.sun.com/j2se/1.3/docs/api/java/lang/Class.html" title="class or interface in java.lang">Class</A> persistentClass)</CODE>
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