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  • jQuery火箭图标返回顶部代码

    循环方式一:

    DELIMITER :;
    
    drop function if exists test.fn_test:;
    
    create function test.fn_test()
    
    returns varchar(32)
    begin
    
    declare temp varchar(36) default 'ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789';
    declare str varchar(32) default '';
    declare i int default 0;
    declare len int;
    
    while i < 32 do
    set i = i + 1;
    set len = CEIL(RAND() * 36);
    set str = CONCAT(str, SUBSTRING(temp, len, 1));
    end while;
    
    return str;
    end:;
    
    DELIMITER;
    
    select fn_test();

    循环方式二:

    DELIMITER :;
    
    drop function if exists test.fn_test:;
    
    create function test.fn_test()
    
    returns varchar(32)
    begin
    
    declare temp varchar(36) default 'ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789';
    declare str varchar(32) default '';
    declare i int default 0;
    declare len int;
    
    loop_lable:LOOP
    
    if(i >= 32) then
        leave loop_lable;
    end if;
    set i = i + 1;
    
    set len = CEIL(RAND() * 36);
    set str = CONCAT(str, SUBSTRING(temp, len, 1));
    end LOOP;
    
    return str;
    end:;
    
    DELIMITER;
    
    select fn_test();

     循环方式三:

    DELIMITER :;
    
    drop function if exists test.fn_test:;
    
    create function test.fn_test()
    
    returns varchar(32)
    begin
    
    declare temp varchar(36) default 'ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789';
    declare str varchar(32) default '';
    declare i int default 0;
    declare len int;
    
    REPEAT set i = i + 1;
    
    set len = CEIL(RAND() * 36);
    set str = CONCAT(str, SUBSTRING(temp, len, 1));
    
    until i >= 32 end REPEAT;
    
    return str;
    end:;
    
    DELIMITER;
    
    select fn_test();
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  • 原文地址:https://www.cnblogs.com/bingco/p/8669982.html
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