[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