如何使用Java运行mysql存储过程

Question

I have a mysql stored procedure.

DELIMITER //  
CREATE PROCEDURE GetRecordsByAge(IN Age INT)  
BEGIN 
  SELECT * FROM test1 WHERE age = Age;  
END //  
DELIMITER ;

When I run this stored procedure through java then it is giving all records of the table.

But if I have a condition in select statement. Why this is happening?

here is set of lines of my code:-

CallableStatement cStmt = null;
cStmt = con.prepareCall("{ CALL GetSpecificRecord(?) }");
cStmt.setInt(1, 25);
cStmt.execute();
ResultSet rs1 = cStmt.getResultSet();

When I print this result set this will give all records of the table.

Where is the problem?

Thanks

Answer 1

The reason why you are getting all records is because of column name collision causing the WHERE clause to be always true. Change the name of the parameter that is not the same with the name of the column you are comparing with,

DELIMITER //  
CREATE PROCEDURE GetRecordsByAge(IN _Age INT)  
BEGIN 
  SELECT * FROM test1 WHERE age = _Age;  
END //  
DELIMITER ;

The second is, you are calling different stored procedure. instead of GetRecordsByAge , you are calling GetSpecificRecord .

Answer 2

Because the condition WHERE age = Age is always ture.

Change the parameter name Age to something else:

DELIMITER //  
CREATE PROCEDURE GetRecordsByAge(IN AgeParam INT)  
BEGIN 
  SELECT * FROM test1 WHERE age = AgeParam;  
END //  
DELIMITER ;