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By default, if you materialize a collection of Oracle objects in JDBC, each of the individual collection elements is retrieved as an instance of the oracle.sql.STRUCT class. The STRUCT class implements the standard java.sql.Struct interface. We have already delved into the details of this class in the 9; in this section, we will look at an example demonstrating the concept. The following Java class, DemoCollectionOfObjectTypes, demonstrates how to retrieve the nested table column values of the single row inserted in the emp_table table that we created in the previous section, with individual elements manifesting as oracle.sql.STRUCT objects. /** This program demonstrates how to select a collection of objects into * JDBC- and how by default they materialize in Java as * oracle.sql.STRUCT objects. * COMPATIBLITY NOTE: * runs successfully against 9.2.0.1.0 and 10.1.0.2.0 */ import java.sql.Struct; import java.sql.SQLException; import java.sql.Connection; import java.sql.Array; import java.sql.PreparedStatement; import java.sql.Types; import java.sql.ResultSet; import oracle.sql.ARRAY; import oracle.jdbc.OracleConnection; import oracle.jdbc.OracleResultSet; import book.util.JDBCUtil; import book.util.Util; class DemoCollectionOfObjectTypes { public static void main(String args[]) throws Exception { Util.checkProgramUsage( args ); Connection conn = null; PreparedStatement pstmt = null; ResultSet rset = null; try { conn = JDBCUtil.getConnection("benchmark", "benchmark", args[0]);

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We cover how you can work with relational databases from F# programs using the ADONET libraries We discuss how you can connect to a database; create, update, and delete tables and records using simple SQL statements; access database data sequentially; and work with parts of tables using disconnected in-memory representations You will also learn how to manage database connections and data sources; create databases; add new tables; and work with relationships, constraints, and stored procedures using Visual Studio We cover how the Language Integrated Query (LINQ) infrastructure can be used in combination with F# meta-programming to bring relational data query logic into reach without explicit use of SQL The essential goal here is to write database queries in F# itself using the same techniques you use to query in-memory data structures Finally, we look at the use of XML as a generic data format.

After getting the connection, we prepare and execute a statement that selects just the nested table column emp_address_list of the table emp_table: String stmtString = "select emp_address_list from emp_table"; pstmt = conn.prepareStatement( stmtString ); // Step 2 - execute the statement and get the result set rset = pstmt.executeQuery(); while( rset.next() ) { Inside the while loop of the ResultSet interface, we get the array using the getArray() method. You can use any of the methods getArray(), getOracleArray(), or getResultSet() to retrieve individual elements as discussed in the section Retrieving a Collection of Varchar2 Elements earlier. We will demonstrate the methods getArray() and getResultSet() in the definition of the methods _doUseGetArray() and doUseResultSet() invoked here: Array array = rset.getArray(1); _doUseGetArray( array ); _doUseResultSet( array ); } } finally { // release JDBC JDBCUtil.close( JDBCUtil.close( JDBCUtil.close( } } The following code defines the method _doUseGetArray(). It uses the method getArray() to retrieve an array of objects. Then it loops through each element of the array, casting it as a Struct object and printing its attributes using the getAttributes() method of the Struct interface that we covered in 9. private static void _doUseGetArray( Array array ) throws SQLException { System.out.println("In _doUseGetArray");System.out.flush(); Object[] arrayInJava = (Object[])array.getArray(); for( int i=0; i < arrayInJava.length; i++ ) { Struct empStruct = (Struct) (arrayInJava[i]); Object[] attributes = empStruct.getAttributes(); for( int j=0; j < attributes.length; j++ ) { System.out.println(attributes[j]); } System.out.println();

Note A linked server in SQL Server is a server that is virtualized locally. That is, a linked server acts as

You already saw in 9 how to work with the XML Document Object Model (DOM), and we briefly survey how to desugar XML into sequences using LinqToXml..

resources rset); pstmt); conn );

} System.out.println("Exiting _doUseGetArray");System.out.flush(); } The method _doUseResultSet(), defined as follows, uses the method getResultSet() to retrieve a ResultSet that contains array elements. It then loops through each element of the ResultSet interface, retrieving the Struct object and then printing out each attribute of these objects. private static void _doUseResultSet( Array array ) throws SQLException { System.out.println("In _doUseResultSet"); ResultSet rset = null; try { rset = array.getResultSet(); while( rset.next() ) { int index = rset.getInt( 1 ); Struct empStruct = (Struct) rset.getObject( 2 ); Object[] attributes = empStruct.getAttributes(); for( int j=0; j < attributes.length; j++ ) { System.out.println(attributes[j]); } System.out.println(); } } finally { JDBCUtil.close( rset); } System.out.println("Exiting _doUseResultSet"); } }

Query languages are often made up of building blocks that transform and filter data. Functional programming gives you the basic tools that allow you to apply standard query logic on all F# types that are compatible with the F# sequence type, such as F# lists, arrays, sequences, and anything else that implements the IEnumerable<'a>/seq<'a> interface.

an alias for an external database, and makes the database look like it s on the local SQL Server, even though it s located on an entirely different server.