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mysql使用存储过程返回多个值_MySQL

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Release: 2016-06-01 13:28:35
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mysql使用存储过程返回多个值

 

可以使用OUT、INOUT参数类型让存储过程返回多个结果值,存储函数不能胜任,因为只能返回一个值。比如统计student数据表里男生和女生人数并通过它的参数返回这两个计数值,让调用者可以访问它们:

 

[sql] delimiter $$  create procedure count_students_by_sex(out p_male int ,out p_female int)  begin  select  count(*) from student where sex= 'M' into p_male;  select count(*) from student where sex='F' into p_feamle;  end $$  delimiter ;  在调用这个过程的时候,把参数替换为用户自定义变量。如:[sql] CALL count_students_by_sex(@mcount,@fcount);  select 'Number of male students:',@mcount;  结果:Number of male studens: @mcountNumber of students: 16
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