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We begin by checking the program usage: if( args.length != 1 ) { System.err.println( "Usage: java <program_name> <database_name>"); Runtime.getRuntime().exit(1); } Connection conn = null; try { Inside the try catch block, the first thing we do is get a connection to the database (the first command-line parameter is the database SID): conn = JDBCUtil.getConnection("benchmark", "benchmark", args[0] ); The function _demoQueryWithPreparedStmt() takes a connection object and a query string that selects an item from the object table item_table. Because in this table there is only one column, and that column is an object type, we need to use the value() function to extract the object value: _demoQueryWithPreparedStmt( conn, "select value(it) from item_table it" ); Next, we invoke the same function, but this time with a query string that selects an item from the table manufactured_item_table. Because in this table the object column is not the only one, we do not need to use the value() function to extract the object value: _demoQueryWithPreparedStmt( conn, "select m.manufactured_item from manufactured_item_table m" ); The next function simply invokes the procedure get_items, which returns a ref cursor, from which we extract objects as Struct Java objects: _demoQueryWithCallableStmt( conn, "begin item_pkg.get_items( ); end;" ); The final commented code invokes the procedure get_item(), which returns an item object as an out parameter. As noted earlier, this won t work as expected due to a bug in both Oracle 10g Release 1 and 9i Release 2: /* the following gives an error in both 10g Release 1 and 9i Release 2. _demoStructWithCallableStmtGivesError( conn, "begin item_pkg.get_item( ); end;" ); */ } finally { // release resources in the finally clause. JDBCUtil.close( conn ); } }

Summary

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The definition of the first function, _demoQueryWithPreparedStmt(), is as follows: private static void _demoQueryWithPreparedStmt( Connection conn, String stmtStr ) throws SQLException { PreparedStatement pstmt = null; ResultSet rset = null; try { pstmt = conn.prepareStatement( stmtStr ); rset = pstmt.executeQuery(); // print the result while (rset.next()) { Inside the while loop, for each object column of a row, we first retrieve the object using the getObject() method of ResultSet interface and cast it to the Struct object: Struct itemStruct = (Struct) rset.getObject ( 1 ); The next step retrieves all attributes from the Struct object into an object array. Notice how all attributes of the object type person materialize as a collection of attributes in an Object array: Object[] attributes = itemStruct.getAttributes(); Finally, we print out the number of attributes and loop through them, printing their class names and their values when converted to a String object: System.out.println ( "num of attributes: " + attributes.length ); for(int i=0; i < attributes.length; i++ ) { System.out.println ( "class of attribute " + i + " = " + (attributes[i]).getClass().getName() + ", value = " + attributes[i] ); } } } finally { // release resources in the finally clause. JDBCUtil.close( rset, pstmt); } } In the next section, we define and explain the methods that use Struct objects in conjunction with CallableStatement.

The next method, _demoQueryWithCallableStmt(), retrieves a ref cursor that contains the object column values. All the steps for converting the object into a Struct and retrieving individual values are exactly the same as in the case of the method _demoQueryWithPreparedStmt() discussed earlier. private static void _demoQueryWithCallableStmt( Connection conn, String stmtStr ) throws SQLException { CallableStatement cstmt = null; ResultSet rset = null; try { cstmt = conn.prepareCall( stmtStr ); cstmt.registerOutParameter( 1, OracleTypes.CURSOR ); cstmt.execute(); rset = (ResultSet) cstmt.getObject(1); while( rset.next() ) { Struct itemStruct = (Struct) rset.getObject ( 1 ); Object[] attributes = itemStruct.getAttributes(); System.out.println ( "num of attributes: " + attributes.length ); for(int i=0; i < attributes.length; i++ ) { System.out.println ( "class of attribute " + i + " = " + (attributes[i]).getClass().getName() + ", value = " + attributes[i] ); } } } finally { // release resources in the finally clause. JDBCUtil.close( rset); JDBCUtil.close( cstmt); } }

In this chapter, you looked at the VE SDK and how you can use it to build your own mapping applications. You looked at how to create and invoke a map on a page and how you can set its location using latitude and longitude. You learned how to zoom in and out of a page programmatically and how to use the object model of the VE control to move the map pane from place to place. Finally, you learned how to annotate the map using the built-in pushpin technology. We just scratched the surface of the capabilities of the feature-rich VE SDK because more in-depth coverage of the entire API would have quickly gone beyond the scope of this chapter.

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