存储过程mysql从每一行返回每个结果列

Question

I want that The stored procedure returns the value of each column of my select.

I have customer table with column 1 column 2 and column 3. I have a select wich return 10 rows and I want to get for each row the result of column 1, column2 and column3.

How can i do this

  BEGIN
  DECLARE n INT DEFAULT 0;
  DECLARE i INT DEFAULT 0;
  DECLARE col1 INT DEFAULT 0;
  DECLARE col2 VARCHAR(10) DEFAULT "";
  DECLARE col3 INT DEFAULT 0;
  SELECT COUNT(*) into n FROM customer;
  set i=1;
  WHILE i<=n DO
  SELECT column1 FROM customer WHERE id=i INTO col1;
  SELECT column2 FROM customer WHERE id=i INTO col2;
  SELECT column3 FROM customer WHERE id=i INTO col3;
  SET i = i + 1;
  END WHILE;
  END 

How can i get each value col1,col2 and col3 to display it and to use it for the next treatment.

How can i call this stored procedure in mysql

Answer 1

Saving your logic you may use

BEGIN
SELECT column1, column2, column3
FROM customer 
WHERE id <= ( SELECT COUNT(*) 
              FROM customer );
END