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   <title>Defining a type mapping</title><link rel="stylesheet" href="styles.css" tppabs="http://www.huihoo.org/jboss/online_manual/3.0/styles.css" type="text/css"><meta name="generator" content="DocBook XSL Stylesheets Vimages/callouts/"><link rel="home" href="index.html" tppabs="http://www.huihoo.org/jboss/online_manual/3.0/index.html" title="JBoss 3.0 Documentation"><link rel="up" href="ch06.html" tppabs="http://www.huihoo.org/jboss/online_manual/3.0/ch06.html" title="Chapter 6. Customizing JAWS"><link rel="previous" href="ch06s07.html" tppabs="http://www.huihoo.org/jboss/online_manual/3.0/ch06s07.html" title="Declaring finders"><link rel="next" href="ch06s14.html" tppabs="http://www.huihoo.org/jboss/online_manual/3.0/ch06s14.html" title="Dependant Value Objects [since JBoss 2.4]"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><table border="0" cellpadding="0" cellspacing="0" height="65"><tr height="65"><td rowspan="2"><img src="jboss.gif" tppabs="http://www.huihoo.org/jboss/online_manual/3.0/jboss.gif" border="0"></td><td rowspan="2" background="gbar.gif" tppabs="http://www.huihoo.org/jboss/online_manual/3.0/gbar.gif" width="100%" align="right" valign="top"><a href="index.html" tppabs="http://www.huihoo.org/jboss/online_manual/3.0/index.html"><img src="doc.gif" tppabs="http://www.huihoo.org/jboss/online_manual/3.0/doc.gif" border="0"></a><a href="ch06.html" tppabs="http://www.huihoo.org/jboss/online_manual/3.0/ch06.html"><img src="toc.gif" tppabs="http://www.huihoo.org/jboss/online_manual/3.0/toc.gif" border="0"></a><a href="ch06s07.html" tppabs="http://www.huihoo.org/jboss/online_manual/3.0/ch06s07.html"><img src="prev.gif" tppabs="http://www.huihoo.org/jboss/online_manual/3.0/prev.gif" border="0"></a><a href="ch06s14.html" tppabs="http://www.huihoo.org/jboss/online_manual/3.0/ch06s14.html"><img src="next.gif" tppabs="http://www.huihoo.org/jboss/online_manual/3.0/next.gif" border="0"></a></td></tr><tr></tr></table><div class="section"><a name="jaws-type-mappings"></a><div class="titlepage"><div><h2 class="title" style="clear: both"><a name="jaws-type-mappings"></a>Defining a type mapping</h2></div></div><p>A type mapping tells JAWS how to map java objects to a specific database. For 
example, some databases have a boolean type, and other
don't, so you have to map a java.lang.Boolean to a CHAR(5).</p><p>Many type mappings are already defined in standardjaws.xml. If you want to 
define a new one, I advise you to modify one of these: copy it
and paste it to the &lt;type-mappings&gt; section of your jaws.xml 
file.</p><p>A type mapping is constituted of several mappings, one for each java Class 
that you need to map. If your class is not found in the mappings,
JAWS will use the mapping for java.lang.Object.</p><p>A mapping comes in 3 parts:</p><div class="itemizedlist"><ul><li><p><a name="d0e2405"></a>       the &lt;java-type&gt; is the name of the java class you want to 
map.
       </p></li><li><p><a name="d0e2408"></a>       the &lt;jdbc-type&gt; is the jdbc type to use. Its value must be 
one of the fields of java.sql.Types (e.g. BIT, CHAR...). This jdbc type will
       be used by JAWS to determine which method to call on PreparedStatement 
and ResultSet for INSERT / UPDATE / SELECT
       queries.
       </p></li><li><p><a name="d0e2411"></a>       the &lt;sql-type&gt; is the actual type in the database. This 
value will only be used when JAWS creates your table.
       </p></li></ul></div><p>If the type mapping we provide for a particular database is faulty and you 
find you have to modify it, please consider sharing your changes:
post the modified mapping on the jbosscmp mailing list.</p></div><table border="0" cellpadding="0" cellspacing="0" height="65"><tr height="65"><td rowspan="2"><img src="gbar.gif" tppabs="http://www.huihoo.org/jboss/online_manual/3.0/gbar.gif" width="432" height="79"></td><td rowspan="2" background="gbar.gif" tppabs="http://www.huihoo.org/jboss/online_manual/3.0/gbar.gif" width="100%" align="right" valign="top"><a href="index.html" tppabs="http://www.huihoo.org/jboss/online_manual/3.0/index.html"><img src="doc.gif" tppabs="http://www.huihoo.org/jboss/online_manual/3.0/doc.gif" border="0"></a><a href="ch06.html" tppabs="http://www.huihoo.org/jboss/online_manual/3.0/ch06.html"><img src="toc.gif" tppabs="http://www.huihoo.org/jboss/online_manual/3.0/toc.gif" border="0"></a><a href="ch06s07.html" tppabs="http://www.huihoo.org/jboss/online_manual/3.0/ch06s07.html"><img src="prev.gif" tppabs="http://www.huihoo.org/jboss/online_manual/3.0/prev.gif" border="0"></a><a href="ch06s14.html" tppabs="http://www.huihoo.org/jboss/online_manual/3.0/ch06s14.html"><img src="next.gif" tppabs="http://www.huihoo.org/jboss/online_manual/3.0/next.gif" border="0"></a></td></tr><tr></tr></table></body></html>
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