calling sql functions using java

Here it shows how to call a sql function from java program.

CallableStatement cs;
try {

// CASE 1  --- Call a function with no parameters; the function returns a VARCHAR

cs = connection.prepareCall("{? = call myfunc}");
// Register the type of the return value
cs.registerOutParameter(1, 15);
// Execute and retrieve the returned value
cs.execute();
String retValue = cs.getString(1);

//CASE 2  --- Call a function with one IN parameter; the function returns a VARCHAR

cs = connection.prepareCall("{? = call myfuncin(?)}");
// Register the type of the return value
cs.registerOutParameter(1, Types.VARCHAR);
// Set the value for the IN parameter
cs.setString(2, "test");
// Execute and retrieve the returned value
cs.execute();
String retValue = cs.getString(1);

//CASE 3 ---- Call a function with one OUT parameter; the function returns a VARCHAR

cs = connection.prepareCall("{? = call myfuncout(?)}");
// Register the types of the return value and OUT parameter
cs.registerOutParameter(1, Types.VARCHAR);
cs.registerOutParameter(2, Types.VARCHAR);
// Execute and retrieve the returned values
cs.execute();
String retValue = cs.getString(1); // return value
String outParam = cs.getString(2); // OUT parameter

//CASE 4 ---- Call a function with one IN/OUT parameter; the function returns a VARCHAR

cs = connection.prepareCall("{? = call myfuncinout(?)}");
// Register the types of the return value and OUT parameter
cs.registerOutParameter(1, Types.VARCHAR);
cs.registerOutParameter(2, Types.VARCHAR);
// Set the value for the IN/OUT parameter
cs.setString(2, "test");
// Execute and retrieve the returned values
cs.execute();
String retValue = cs.getString(1); // return value
String outParam = cs.getString(2); // IN/OUT parameter

} catch (SQLException e) {
System.out.println(e);
}