MySql存储过程使用游标循环插入数据示例

来源：互联网发布：金税盘重装后数据没了编辑：程序博客网时间：2024/05/16 15:43

本示例通过 while...end while 循环控制游标来实现插入表记录。

DROP PROCEDURE IF exists pro_initCategoryForTradingEntity;
create procedure pro_initCategoryForTradingEntity(tradingEntityId int)
begin
    declare f_parent,entityId int;
    declare b int default 0;    /*是否达到记录的末尾控制变量*/
    declare f_name varchar(100);
    DECLARE cur_1 CURSOR FOR select FName,FParent,tradingEntityId from t_category_tag;
    DECLARE CONTINUE HANDLER FOR NOT FOUND SET b = 1;
    OPEN cur_1;
    FETCH cur_1 INTO f_name, f_parent, entityId; /*获取第一条记录*/
    while b<>1 do
        insert into t_category(FName,FParent,FTradingEntity) values(f_name, f_parent, entityId);
        FETCH cur_1 INTO f_name, f_parent, entityId; /*取下一条记录*/
    end while;
    close cur_1;
end;
call pro_initCategoryForTradingEntity(2);

另外循环也可以用repeat...end repeat 来循环控制，以下是我最初所做的示例代码，但结果是插入的实际数据总数多出一条,在此列出作为一个反面示例代码。当然最后用的是上面while...end while 方案。尚优旺

DROP PROCEDURE IF exists pro_initCategoryForTradingEntity;
create procedure pro_initCategoryForTradingEntity(tradingEntityId int)
begin
        declare f_parent,entityId,b int;
    declare f_name varchar(100);
    DECLARE cur_1 CURSOR FOR select FName,FParent,tradingEntityId from t_category_tag;
    DECLARE CONTINUE HANDLER FOR NOT FOUND
    SET b = 1;
    OPEN cur_1;
    REPEAT
        FETCH cur_1 INTO f_name, f_parent, entityId;
        insert into t_category(FName,FParent,FTradingEntity) values(f_name, f_parent, entityId);
    UNTIL b = 1
    END REPEAT;
    close cur_1;
end;
call pro_initCategoryForTradingEntity(2);

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