200a40b332
git-svn-id: http://svn.us.apache.org/repos/asf/tuscany@1640879 13f79535-47bb-0310-9956-ffa450edef68
145 lines
7.7 KiB
HTML
145 lines
7.7 KiB
HTML
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<HTML>
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<META name="keywords" content="apache, apache tuscany, tuscany, service, services, fabric, soa, service oriented architecture, sca, service component architecture, das, sdo, csa, ruby, opensource">
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<LINK type="text/css" rel="stylesheet" href="http://tuscany.apache.org/stylesheets/default.css">
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<A href="home.html" title="Apache Tuscany">Apache Tuscany</A> > <A href="home.html" title="Home">Home</A> > <A href="das-overview.html" title="DAS Overview">DAS Overview</A> > <A href="das-java.html" title="DAS Java">DAS Java</A> > <A href="das-java-documentation-menu.html" title="DAS Java Documentation Menu">DAS Java Documentation Menu</A> > <A href="das-java-developer-guide.html" title="DAS Java Developer Guide">DAS Java Developer Guide</A> > <A href="rdb-das-java.html" title="RDB DAS Java">RDB DAS Java</A> > <A href="rdb-das-user-guide.html" title="RDB DAS - User Guide">RDB DAS - User Guide</A> > <A href="" title="WorkingWithCompoundKeys">WorkingWithCompoundKeys</A>
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<H1><A name="WorkingWithCompoundKeys-WorkingWithCompoundKeys"></A>WorkingWithCompoundKeys</H1>
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<P>The RDB DAS provides the ability to work with single-column keys as well as keys composed of multiple columns (<A href="http://en.wikipedia.org/wiki/Compound_key" class="external-link" rel="nofollow">compound keys</A>). RDB DAS clients can specify the primary key for a table as well as foreign keys that reference other tables. The primary key for a table can be identified to the DAS via configuration (typically via a configuration xml file). The following is an example config file that defines a compound primary key:</P>
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<PRE><Config xsi:noNamespaceSchemaLocation="http:///org.apache.tuscany.das.rdb/config.xsd" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
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<Table tableName="ORDERDETAILS">
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<Column columnName="ORDERID" primaryKey="true"/>
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<Column columnName="PRODUCTID" primaryKey="true"/>
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</Table>
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</Config>
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</PRE>
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</DIV></DIV>
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<P>Relationships between tables are in terms of primary keys and foreign keys and so foreign keys can also be compound. The following example illustrates a relationship using a compound foreign key:</P>
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<DIV class="preformatted panel" style="border-width: 1px;"><DIV class="preformattedContent panelContent">
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<PRE><Config xsi:noNamespaceSchemaLocation="http:///org.apache.tuscany.das.rdb/config.xsd" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
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<Table tableName="ORDERDETAILS">
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<Column columnName="ORDERID" primaryKey="true"/>
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<Column columnName="PRODUCTID" primaryKey="true"/>
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</Table>
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<Table tableName="ORDERDETAILSDESC">
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<Column columnName="ID" primaryKey="true"/>
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<Relationship name="orderDetailsDesc" primaryKeyTable="ORDERDETAILS"
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foriegnKeyTable="ORDERDETAILSDESC" many="true">
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<KeyPair primaryKeyColumn="ORDERID" foriegnKeyColumn="ORDERID" />
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<KeyPair primaryKeyColumn="PRODUCTID" foreignKeyColumn="PRODUCTID" />
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</Relationship>
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</Config>
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</PRE>
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Copyright <20> 2003-2012, The Apache Software Foundation </BR>
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Apache Tuscany and the Apache Tuscany project logo are trademarks of The Apache Software Foundation.
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