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Difference between revisions of "EclipseLink/Examples/DBWS/DBWSIntermediateAttribute"
< EclipseLink | Examples | DBWS
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</source> | </source> | ||
− | In the <tt>eclipselink-dbwsutils.jar</tt>, | + | In the <tt>eclipselink-dbwsutils.jar</tt>, the built-in transformers form a [http://en.wikipedia.org/wiki/Chain-of-responsibility_pattern <i>Chain-of-Responsibility</i>] |
− | + | ||
[[Image:NCTChainOfResponsibility.png|650px]] | [[Image:NCTChainOfResponsibility.png|650px]] | ||
<br clear="all"/> | <br clear="all"/> | ||
− | |||
In the <tt>o.e.p.tools.dbws.NamingConventionTransformer</tt> services file, the transformer chain is listed in order: | In the <tt>o.e.p.tools.dbws.NamingConventionTransformer</tt> services file, the transformer chain is listed in order: | ||
<source lang="text" enclose="div"> | <source lang="text" enclose="div"> |
Revision as of 13:15, 3 June 2009
Naming Convention for schema elements
As seen in the Basic Table example, the DBWSBuilder-generated eclipselink-dbws-schema.xsd file derives <element-tag> names from the Database table metadata:
<?xml version="1.0" encoding="UTF-8"?>
<xsd:schema
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:xsd="http://www.w3.org/2001/XMLSchema"
>
<xsd:complexType name="empType">
<xsd:sequence>
<xsd:element name="empno" type="xsd:int" xsi:nil="false"/>
<xsd:element name="ename" type="xsd:string" xsi:nil="true"/>
<xsd:element name="job" type="xsd:string" xsi:nil="true"/>
<xsd:element name="mgr" type="xsd:int" minOccurs="0" xsi:nil="true"/>
<xsd:element name="hiredate" type="xsd:dateTime" xsi:nil="true"/>
<xsd:element name="sal" type="xsd:decimal" xsi:nil="true"/>
<xsd:element name="comm" type="xsd:int" minOccurs="0" xsi:nil="true"/>
<xsd:element name="deptno" type="xsd:int" xsi:nil="true"/>
</xsd:sequence>
</xsd:complexType>
</xsd:schema>
<xsd:schema
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:xsd="http://www.w3.org/2001/XMLSchema"
>
<xsd:complexType name="empType">
<xsd:sequence>
<xsd:element name="empno" type="xsd:int" xsi:nil="false"/>
<xsd:element name="ename" type="xsd:string" xsi:nil="true"/>
<xsd:element name="job" type="xsd:string" xsi:nil="true"/>
<xsd:element name="mgr" type="xsd:int" minOccurs="0" xsi:nil="true"/>
<xsd:element name="hiredate" type="xsd:dateTime" xsi:nil="true"/>
<xsd:element name="sal" type="xsd:decimal" xsi:nil="true"/>
<xsd:element name="comm" type="xsd:int" minOccurs="0" xsi:nil="true"/>
<xsd:element name="deptno" type="xsd:int" xsi:nil="true"/>
</xsd:sequence>
</xsd:complexType>
</xsd:schema>
Converting the database metadata into the names of <element-tag>'s is the job of o.e.p.tools.dbws.NamingConventionTransformer
's
public interface NamingConventionTransformer { public enum ElementStyle { ELEMENT, ATTRIBUTE, NONE }; public String generateSchemaName(String tableName); public String generateElementAlias(String originalElementName); public ElementStyle styleForElement(String originalElementName); }
In the eclipselink-dbwsutils.jar, the built-in transformers form a Chain-of-Responsibility
In the o.e.p.tools.dbws.NamingConventionTransformer services file, the transformer chain is listed in order:
eclipselink-dbwsutils.jar
|
+---META-INF
| | MANIFEST.MF
| |
| \---services
| org.eclipse.persistence.tools.dbws.NamingConventionTransformer
contains 3 lines:
org.eclipse.persistence.tools.dbws.ToLowerTransformer
org.eclipse.persistence.tools.dbws.TypeSuffixTransformer
org.eclipse.persistence.tools.dbws.SQLX2003Transformer
|
+---META-INF
| | MANIFEST.MF
| |
| \---services
| org.eclipse.persistence.tools.dbws.NamingConventionTransformer
contains 3 lines:
org.eclipse.persistence.tools.dbws.ToLowerTransformer
org.eclipse.persistence.tools.dbws.TypeSuffixTransformer
org.eclipse.persistence.tools.dbws.SQLX2003Transformer
=== Changing an <element-tag> to an "attrib It is possible to change an <element-tag> to an "attribute" with a custom transformer: