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<H1><A name="ResultSetDrivenDataObjectTypes-ResultSetDrivenDataObjectTypes%26nbsp%3B"></A>ResultSetDrivenDataObjectTypes </H1>
<P>When the RDB DAS is operating in pure dynamic mode (no user provided static DataObjects), it uses uses JDBC <A href="http://java.sun.com/j2se/1.3/docs/api/java/sql/ResultSetMetaData.html" class="external-link" rel="nofollow">ResultSetMetadata</A>to create the set of SDO Types used to construct the data graph returned as a result of a query. JDBC returns the data resulting from a query as a set of rows of column values. The associated ResultSetMetadata provides information about these values. Table name, column name, column type, etc. are all provided for each returned value.</P>
<P>For example, consider a database with the following table:</P>
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<PRE>TABLE CUSTOMER
ID INTEGER
LASTNAME VARCHAR(20)
ADDRESS VARCHAR(30)
</PRE>
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<P>The user might query the database like this:</P>
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<P> DAS das = DAS.FACTORY.createDAS(getConnection());<BR>
Command readCustomers = das.createCommand("select * from CUSTOMER where LASTNAME = 'Williams'");<BR>
DataObject root = readCustomers.executeQuery();</P>
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<P>The DAS returns a graph of DataObjects each of Type CUSTOMER and each instance will have three properties: (ID, LASTNAME, ADDRESS). Since this example does not pass the DAS a set of SDO Types to use, the DAS creates the Types dynamically based on the ResultSetMetadata.</P>
<P>The RDB DAS also allows clients to receive the results of queries as Static DataObjects (see <A href="workingwithstaticdataobjects.html" title="WorkingWithStaticDataObjects">WorkingWithStaticDataObjects</A>). </P>
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