[转]mysql存储过程学习小结

[转]mysql存储过程学习总结
1.基本语法：call sp_name()
create procedure 存储过程名字()  
(  
[in|out|inout] 参数 datatype  
)  
begin  
MySQL 语句;  
end;
MySQL 存储过程中的变量，不需要在变量名字前加“@”，虽然 MySQL 客户端用户变量要加个“@”。

drop procedure sp_name//

1.区块定义，常用
begin
……
end;
也可以给区块起别名，如：
lable:begin
………..
end lable;
可以用leave lable;跳出区块，执行区块以后的代码
2.条件语句
if 条件 then
statement
else
statement
end if;

3.循环语句
(1).while循环
[label:] WHILE expression DO
statements
END WHILE [label] ;

(2).loop循环
[label:] LOOP
statements
END LOOP [label];

(3).repeat until循环
[label:] REPEAT
statements
UNTIL expression
END REPEAT [label] ;

1.show procedure status
显示数据库中所有存储的存储过程基本信息，包括所属数据库，存储过程名称，创建时间等
2.show create procedure sp_name
显示某一个存储过程的详细信息

附

 drop procedure if exists pr_statis_rows; create procedure pr_statis_rows(        db1 varchar(50),        db2 varchar(50)    )    begin    DECLARE done INT DEFAULT 0; declare tempTableName varchar(50); declare stmt varchar(2000);  DECLARE cur CURSOR FOR select table_name from INFORMATION_SCHEMA.TABLES where table_type='BASE TABLE' and table_schema=db1; DECLARE CONTINUE HANDLER FOR SQLSTATE '02000' SET done = 1;  create TEMPORARY table IF NOT EXISTS  ecard_row (table_name varchar(50), rows_ int, table_name2 varchar(50), rows_2 int);   -- 打开 /* select db1;  */ # 打印db1  OPEN cur;  REPEAT     FETCH cur INTO tempTableName;     if tempTableName<>'ecard_row' then       IF NOT done THEN          set @c1=0;                set @c2=0;                  set @sql = concat('select count(*) from ', db1 ,'.', tempTableName, ' into @c1');                set @sql2 = concat('select count(*) from ', db2 ,'.', tempTableName, ' into @c2');            prepare stmt from @sql;            execute stmt;                 prepare stmt from @sql2;            execute stmt;            Insert ecard_row values (tempTableName, @c1, tempTableName, @c2);         END IF;     end if;      UNTIL done END REPEAT;      CLOSE  cur; # 不能有return  end;   delete from ecard.ecard_row; # 不能省略参数 call ecard.pr_statis_rows('aa','bb'); select * from ecard.ecard_row  show procedure status 

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