Mysql 存储过程中使用多游标

Mysql 存储过程中使用多游标

drop procedure IF EXISTS test_proc_1;
create procedure test_proc_1()
begin
    DECLARE done INT DEFAULT 0;
    DECLARE tid int(11) DEFAULT 0;
    DECLARE tname varchar(50) DEFAULT NULL;
    DECLARE tpass varchar(50) DEFAULT NULL;

    DECLARE cur_1 CURSOR FOR
        select name, password from netingcn_proc_test;

    DECLARE cur_2 CURSOR FOR
        select id, name from netingcn_proc_test;

    DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = 1;

    open cur_1;
    REPEAT
        FETCH cur_1 INTO tname, tpass;
        if not done then
            select tname, tpass;
        end if;
     UNTIL done END REPEAT;
    CLOSE cur_1;

    -- 注意这里，一定要重置done的值为 0
    set done = 0;

    open cur_2;
    REPEAT
        FETCH cur_2 INTO tid, tname;
        if not done then
            select tid, tname;
        end if;
     UNTIL done END REPEAT;
    CLOSE cur_2;
end

call test_proc_1();

或者

drop procedure IF EXISTS test_proc_2;
create procedure test_proc_2()
begin
    DECLARE done INT DEFAULT 0;
    DECLARE tname varchar(50) DEFAULT NULL;
    DECLARE tpass varchar(50) DEFAULT NULL;

    DECLARE cur_1 CURSOR FOR
        select name, password from netingcn_proc_test;

    DECLARE cur_2 CURSOR FOR
        select id, name from netingcn_proc_test;

    DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = 1;

    open cur_1;
    REPEAT
        FETCH cur_1 INTO tname, tpass;
        if not done then
            select tname, tpass;
        end if;
     UNTIL done END REPEAT;
    CLOSE cur_1;

    begin
        DECLARE done INT DEFAULT 0;
        DECLARE tid int(11) DEFAULT 0;
        DECLARE tname varchar(50) DEFAULT NULL;

        DECLARE cur_2 CURSOR FOR
            select id, name from netingcn_proc_test;

        DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = 1;

        open cur_2;
        REPEAT
            FETCH cur_2 INTO tid, tname;
            if not done then
                select tid, tname;
            end if;
         UNTIL done END REPEAT;
        CLOSE cur_2;
    end;
end

call test_proc_2();