//************************************************************************************
//
// Copyright (c) 2004-2008 by Teradata Corporation
// All Rights Reserved
//
// TERADATA CORPORATION CONFIDENTIAL AND TRADE SECRET
//
//************************************************************************************
//
// File: T20501JD.java
// Header: none
// Purpose: Demonstrate basic Teradata SQL using the JDBC API by
// executing a DELETE statement using parameter markers.
// The program will:
// - Connect as user guest/please
// - Delete a row from the employee2 table
// - Display the number of rows deleted
// - Disconnect.
//
// JDBC API: java.sql.Connection, java.sql.PreparedStatement,
// java.sql.PreparedStatement.executeUpdate
//
// Version: Updated for Teradata V2R6
//
//************************************************************************************
import java.sql.*;
public class T20501JD
{
// Name of the user able to create, drop, and manipulate tables
public static String sUser = "guest";
public static String sPassword = "please";
public static void main(String args[])
throws ClassNotFoundException
{
// Creation of URL to be passed to the JDBC driver
String url = "jdbc:teradata://whomooz/TMODE=ANSI,CHARSET=UTF8";
// Creating strings representing a prepared statement and its
// respective parameter value
String sUpdate = "DELETE FROM employee2 WHERE empName = ?";
String Name = "Mike Smith";
try
{
System.out.println(" Sample T20501JD: ");
System.out.println(" Looking for the Teradata JDBC driver... ");
// Loading the Teradata JDBC driver
Class.forName("com.teradata.jdbc.TeraDriver");
System.out.println(" JDBC driver loaded. ");
// Attempting to connect to Teradata
System.out.println(" Attempting to connect to Teradata via" +
" the JDBC driver...");
// Creating a connection object
Connection con = DriverManager.getConnection(url, sUser, sPassword);
System.out.println(" User " + sUser + " connected.");
System.out.println(" Connection to Teradata established. ");
try
{
System.out.println(" Preparing this SQL statement for" +
" execution: " + sUpdate);
// Creating a prepared statement object from an active connection
PreparedStatement pstmt = con.prepareStatement(sUpdate);
System.out.println(" Prepared statement object created. ");
try
{
int RowCount; // Return value for deleted row count
// The following code will perform a DELETE on the table
// using a prepared statement.
System.out.println(" Attempting a deletion...");
// Set parameter values indicated by ? (dynamic update)
System.out.println(" Using setString() to assign"
+ " value to the parameter marker: ");
pstmt.setString(1, Name);
System.out.println(" FIRST ? set to: " + Name);
// Call without parameter to execute SQL command
RowCount = pstmt.executeUpdate();
System.out.println(" Deletion completed successfully: "
+ RowCount + " row(s) deleted.");
}
finally
{
// Close the statement
pstmt.close();
System.out.println(" Statement object closed. ");
}
}
finally
{
// Close the connection
System.out.println(" Closing connection to Teradata...");
con.close();
System.out.println(" Connection to Teradata closed. ");
}
System.out.println(" Sample T20501JD finished. ");
}
catch (SQLException ex)
{
// A SQLException was generated. Catch it and display
// the error information.
// Note that there could be multiple error objects chained
// together.
System.out.println();
System.out.println("*** SQLException caught ***");
while (ex != null)
{
System.out.println(" Error code: " + ex.getErrorCode());
System.out.println(" SQL State: " + ex.getSQLState());
System.out.println(" Message: " + ex.getMessage());
ex.printStackTrace();
System.out.println();
ex = ex.getNextException();
}
throw new IllegalStateException ("Sample failed.") ;
}
} // End main
} // End class T20501JD
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