Question

使用PHPMyAdmin和MySQL。我正在尝试添加例程。

BEGIN
DECLARE cursor_ID INT;
  DECLARE cursor_VAL VARCHAR;
  DECLARE done INT DEFAULT FALSE;
  DECLARE cursor_i CURSOR FOR SELECT ca.apprentice_id, c.courseNumber, c.level FROM tblcourseassignments ca LEFT JOIN tblcourses c ON ca.course_id = c.id;
  DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = TRUE;
  DECLARE varc1 INT DEFAULT 0;
  DECLARE varc2 INT DEFAULT 0;
  DECLARE varc3 INT DEFAULT 0;
  DECLARE gradeCount INT;

  OPEN cursor_i;
  read_loop: LOOP
    FETCH cursor_i INTO varc1, varc2;
    SELECT COUNT(id) INTO gradeCount FROM tblapprenticegrades WHERE apprentice_id = varc1 and course_id = varc2;

    if gradeCount = 0 then 
        INSERT INTO tblapprenticegrades(apprentice_id, course_id, phase) VALUES (varc1, varc2, varc3);
    end if

    IF done THEN
      LEAVE read_loop;
    END IF;
    --queries which couldnt be made into set based queries go here---
  END LOOP;
  CLOSE cursor_i;
END;

但我继续犯这个错误：

MySQL说：＃1064 - 你的SQL语法有错误;检查手册，对应右边的MySQL服务器版本在'附近使用的语法'; DECLARE完成INT DEFAULT FALSE; DECLARE cursor_i CURSOR FOR SELECT ca.ap'在第3行

Answer 1

请在代码中找到修复程序。

Varchar需要指定长度。
游标和处理程序声明必须在声明的末尾
语法错误。

BEGIN
DECLARE cursor_ID INT;
  DECLARE cursor_VAL VARCHAR(100);  /* Varchar length */
  DECLARE done INT DEFAULT FALSE;
  DECLARE varc1 INT DEFAULT 0;
  DECLARE varc2 INT DEFAULT 0;
  DECLARE varc3 INT DEFAULT 0;
  DECLARE gradeCount INT;
  /* cursor and handler declaration at the end of declarations */
  DECLARE cursor_i CURSOR FOR SELECT ca.apprentice_id, c.courseNumber, c.`level` FROM tblcourseassignments ca LEFT JOIN tblcourses c ON ca.course_id = c.id;
  DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = TRUE;

  OPEN cursor_i;
  read_loop: LOOP
    FETCH cursor_i INTO varc1, varc2;
    SELECT COUNT(id) INTO gradeCount FROM tblapprenticegrades WHERE apprentice_id = varc1 and course_id = varc2;

    if gradeCount = 0 then 
        INSERT INTO tblapprenticegrades(apprentice_id, course_id, phase) VALUES (varc1, varc2, varc3);
    end if;  /* semicolon here */

    IF done THEN
      LEAVE read_loop;
    END IF;
    --queries which couldnt be made into set based queries go here---
  END LOOP;
  CLOSE cursor_i;
END

MySQL PHPMyAdmin - 例程错误

1 个答案: