存储过程在调用时不起作用，但是准备好的语句起作用

Question

my problem is, that in mysql I created a stored procedure. Im trying to call this procedure through my java-code.

I dont get any exception but the db is not affected. If I make the same Statement through a preparedstatement everything works just fine. And if i call the procedure manuallys in the workbench it works too.

Stored Procedure

CREATE DEFINER=`root`@`localhost`PROCEDURE `delete`(IN id INT(11))
BEGIN SET SQL_SAFE_UPDATES=0; Delete from sender where id = id; 
END

Call in Code

        public void deleteSender(int id){
        CallableStatement cStmt = null;
        PreparedStatement pStmt = null;
        PreparedStatement pStmt_2 = null;

        try {
            Class.forName("com.mysql.jdbc.Driver");
            connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/info", "root","");

String call = "{call delete(?)}";
cStmt = connection.prepareCall(call);
cStmt.setInt(1, id);
boolean b = cStmt.execute();


        } catch (Exception e) {

        }

    }

As prepared Statement:

    public void deleteSender(int id){

        CallableStatement cStmt = null;
        PreparedStatement pStmt = null;
        PreparedStatement pStmt_2 = null;

        try {
            Class.forName("com.mysql.jdbc.Driver");
            connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/info", "root","");

            pStmt = connection.prepareStatement("Delete from sender where id="+id);
            pStmt_2 = connection.prepareStatement("Delete from  table2 where sender_id="+id);

            boolean b = pStmt.execute();
            boolean b_2 = pStmt_2.execute();
            if(b == false || b_2 == false){
                JOptionPane.showMessageDialog(null, "Data deleted");
            }
        } catch (Exception e) {

        }

Any ideas ??

Answer 1

In the stored procedure, avoid naming its parameters as the name of its columns. Rename the input parameter id by _id (for example), leaving your stored procedure as follows:

CREATE DEFINER=`root`@`localhost` PROCEDURE `delete`(IN _id INT(11))
BEGIN
    SET SQL_SAFE_UPDATES := 0;
    DELETE FROM sender WHERE id = _id; 
END;