This section describes how to create CallableStatement objects with IN and OUT parameters.
For an IN parameter defined in a stored procedure, you can put a static value or a place holder
in the CALL statement when creating the CallableStatement object. A value for that place holder
must be provided by the setXXX() method.
For an OUT parameter defined in a stored procedure, you must put a place holder
in the CALL statement when creating the CallableStatement object. That place holder must be registered with
the registerOutParameter() method.
In a previous tutorial, I defined a store procedure called, ReverseProcedure(), with 1 IN parameter and 2 OUT
parameters. The program below shows you to create a CallableStatement object to execute this stored procedure:
/**
* MySqlCallParameter.java
* Copyright (c) 2007 by Dr. Herong Yang. All rights reserved.
*/
import java.sql.*;
public class MySqlCallParameter {
public static void main(String [] args) {
Connection con = null;
try {
com.mysql.jdbc.jdbc2.optional.MysqlDataSource ds
= new com.mysql.jdbc.jdbc2.optional.MysqlDataSource();
ds.setServerName("localhost");
ds.setPortNumber(3306);
ds.setDatabaseName("HerongDB");
ds.setUser("Herong");
ds.setPassword("TopSecret");
con = ds.getConnection();
// Create CallableStatement
CallableStatement cs = con.prepareCall(
"CALL ReverseProcedure(?,?,?)");
// Provide values for IN parameters
String word = "Herong";
cs.setString(1,word);
// Register OUT parameters
cs.registerOutParameter(2, java.sql.Types.VARCHAR);
cs.registerOutParameter(3, java.sql.Types.INTEGER);
// Execute the CALL statement and ignore result sets
cs.executeUpdate();
// Retrieve values from OUT parameters
String reversed = cs.getString(2);
int length = cs.getInt(3);
System.out.println("Input word: "+word);
System.out.println("Output word: "+reversed);
System.out.println("Word length: "+length);
// Close resource
cs.close();
con.close();
} catch (Exception e) {
System.err.println("Exception: "+e.getMessage());
e.printStackTrace();
}
}
}
The output of the program confirms that I handled IN and OUT parameters correctly:
