MySql 存储过程使用游标循环插入数据示例

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。

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);