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<H1><A name="WorkingWithCompoundKeys-WorkingWithCompoundKeys"></A>WorkingWithCompoundKeys</H1>
<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">
<Table tableName="ORDERDETAILS">
<Column columnName="ORDERID" primaryKey="true"/>
<Column columnName="PRODUCTID" primaryKey="true"/>
</Table>
</Config>
</PRE>
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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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<PRE><Config xsi:noNamespaceSchemaLocation="http:///org.apache.tuscany.das.rdb/config.xsd" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<Table tableName="ORDERDETAILS">
<Column columnName="ORDERID" primaryKey="true"/>
<Column columnName="PRODUCTID" primaryKey="true"/>
</Table>
<Table tableName="ORDERDETAILSDESC">
<Column columnName="ID" primaryKey="true"/>
</Table>
<Relationship name="orderDetailsDesc" primaryKeyTable="ORDERDETAILS"
foriegnKeyTable="ORDERDETAILSDESC" many="true">
<KeyPair primaryKeyColumn="ORDERID" foriegnKeyColumn="ORDERID" />
<KeyPair primaryKeyColumn="PRODUCTID" foreignKeyColumn="PRODUCTID" />
</Relationship>
</Config>
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