MySQL存储历程 游标 错误处理的示例代码【MySQL教程】,MySQL,错误,游标

MySQL存储历程 游标 错误处理的示例代码

--set_account_data 从新生成用户编号

BEGIN
  DECLARE temp_id INT(8);                                        /*用户id*/
  DECLARE temp_manager INT(8);                            /*上级id*/
  DECLARE temp_accounter_no VARCHAR(64);        /*上级编码*/
    DECLARE temp_max_no VARCHAR(64);                    /*上级的最大下级编码*/
    DECLARE max_no VARCHAR(64);                                /*编码*/
    DECLARE str1 VARCHAR(64);                                    /*编码*/
    DECLARE temp_no INT(8);                                        /*编码*/
    DECLARE temp_level INT(8);                                /*级次*/
    DECLARE state VARCHAR(30);                                /*错误处理监听变量*/

    /*定义用户表游标*/
    DECLARE account_cursor CURSOR FOR SELECT id,manager FROM account ORDER BY manager,id;

    /*定义错误处理监听，用于完毕游标轮回*/
    DECLARE CONTINUE HANDLER FOR 1329
    BEGIN
        SET state = 'error';
    END; 

  OPEN account_cursor;
  REPEAT
        FETCH account_cursor INTO temp_id,temp_manager;
        IF (temp_id = 1) THEN
            UPDATE account SET leaf = 0,no = '01',level = 1 WHERE id = 1;
        ELSE
            /*设置上级leaf为0*/
            UPDATE account SET leaf = 0 WHERE id = temp_manager;
            /*查询上级编号*/
            SELECT no INTO temp_accounter_no FROM account WHERE id = temp_manager;
            /*设置上级编码*/
            UPDATE account SET pno = temp_accounter_no WHERE id = temp_id;
            /*查询上级原有的最大下级编码*/
            SELECT MAX(no) INTO temp_max_no FROM account WHERE pno = temp_accounter_no;
            /*假如最大下级编码为空，生成新的编码，不然把本来的编码加一*/
            IF (temp_max_no IS NULL) THEN
                SET max_no = concat(temp_accounter_no, '0001');
            ELSE 
                SET str1 = SUBSTR(temp_max_no,LENGTH(temp_max_no)-3,4);
                SET temp_no = str1;
                SET temp_no = temp_no + 1;
                SET str1 = temp_no;
                IF (LENGTH(str1) = 1) THEN
                    SET str1 = concat('000', str1);
                ELSEIF (LENGTH(str1) = 2) THEN
                    SET str1 = concat('00', str1);
                ELSEIF (LENGTH(str1) = 3) THEN
                    SET str1 = concat('0', str1);            
                END IF;
                SET max_no = concat(temp_accounter_no, str1);
            END IF;
            UPDATE account SET no = max_no WHERE id = temp_id;
            SET temp_level = (LENGTH(max_no) + 2) / 4;
            UPDATE account SET level = temp_level WHERE id = temp_id;
        END IF;
        UNTIL state = 'error'
    END REPEAT;
    CLOSE account_cursor;
    /*修正leaf为null的为1*/
    UPDATE account SET leaf = 1 WHERE leaf IS NULL;
    RETURN 0;
END

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