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The program DemoQueryAndUpdateUsingWeaklyTypedRefs demonstrates how to query or update reference objects from JDBC. The program begins with the import statements and obtaining the connection in the main() method as follows: /** This program demonstrates how to * 1. query a ref object * 2. dereference it to get its value * 3. update its value and store it back in the database * COMPATIBLITY NOTE: * runs successfully against 9.2.0.1.0 and 10.1.0.2.0 */ import java.sql.SQLException; import java.sql.Connection;

The implementation of the calendar is encapsulated within the asp:Calender tag:

import java.sql.PreparedStatement; import java.sql.Ref; import java.sql.ResultSet; import oracle.sql.STRUCT; import book.util.JDBCUtil; import book.util.Util; class DemoQueryAndUpdateUsingWeaklyTypedRefs { public static void main(String args[]) throws SQLException { Util.checkProgramUsage( args ); Connection conn = null; try { conn = JDBCUtil.getConnection("benchmark", "benchmark", args[0]); The method _doSelectRef() demonstrates how to select a Ref object: _doSelectRef( conn ); The method _doUpdateRef() demonstrates how to update a Ref object so that it points to a different row after the update: _doUpdateRef( conn ); } finally { // release resources associated with JDBC // in the finally clause. JDBCUtil.close( conn ); } } Querying a Ref Object The method _doSelectRef() is defined as follows: private static void _doSelectRef( Connection conn ) throws SQLException { We define a query statement that selects all columns of the table emp_table_with_ref including the reference column manager: String stmtString = "select e.emp_no, e.name, e.manager" + " from emp_table_with_ref e"; PreparedStatement pstmt = null; ResultSet rset = null; try {

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pstmt = conn.prepareStatement( stmtString ); rset = pstmt.executeQuery(); System.out.println("executed query"); while(rset.next()) { We retrieve and print out the values in the columns emp_no and name first: int empNo = rset.getInt( 1 ); String name = rset.getString( 2 ); System.out.println("emp no : " + empNo ); System.out.println("emp name : " + name ); We then use the method getRef() in the ResultSet interface to retrieve the reference object: Ref managerRef = rset.getRef( 3 ); Next, we retrieve the object pointed to by the reference object. Since there is no type map specified, we will get the value as a STRUCT object. Note that the record corresponding to the top-level employee (Larry) has a null reference, so we need to check for that condition. if( managerRef != null ) { We print out the SQL object base type of this reference object: System.out.println( "Reference SQL Type: " + managerRef.getBaseTypeName() ); As mentioned earlier, the getObject() method of java.sql.Ref interface gives an unsupported feature exception when working with either 9i Release 2 or 10g Release 1 databases. Hence, we have to use the getValue() method of the REF class: // The following gives an Unsupported feature in 9i and 10g //STRUCT manager = (STRUCT) ((oracle.sql.REF)managerRef).getObject(); STRUCT manager = (STRUCT) ((oracle.sql.REF)managerRef).getValue(); In the remainder of the method, we simply use the getAttributes() method of the Struct interface to print out the attribute values of the object to which the reference points: Object attributes[] = manager.getAttributes(); System.out.println("no of manager attributes : " + attributes.length ); for(int i=0; i < attributes.length; i++ ) { if( attributes[i] != null ) { System.out.println("\tattribute # " + i + " class name " + attributes[i].getClass().getName() + " value " + attributes[i]); }

Visual Studio invokes code within the Calendar server control class to create the visual representation in the designer view of the integrated development environment (IDE). Similarly, at runtime, the ASP.NET engine detects the <asp:Calendar> tag and invokes code within the Calendar server control class to generate the HTML necessary to render the calendar in the browser and the JavaScript that provides its functionality. Figure 2-3 shows the page being rendered in Internet Explorer.

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