mysql 滚动存储_MySQL存储过程详解 mysql 存储过程

-- mysql游标循环的使用 --

delimiter //

drop procedure if EXISTS sum_money;

create procedure sum_money()

begin

declare p_uid int default 0;

declare p_money DECIMAL(10,2) default 0.0;

declare p_sumMoney DECIMAL(11,2) default 0.0;

declare no_more_record int default 0;

declare cur CURSOR for select uid,money from `ezcm_member` order by uid limit 0,1000;

declare CONTINUE HANDLER for not found set no_more_record=1;

open cur;

fetch cur into p_uid,p_money;

while no_more_record !=1 DO

set p_sumMoney = p_sumMoney+p_money;

fetch cur into p_uid,p_money;

end while;

close cur;

SELECT p_sumMoney;

END

//

delimiter ;

call sum_money();

函数与存储过程的区别：

1、只有函数有返回值。

函数的格式：

create function func_name()

返回类型

returns int(5)

begin

定义变量

。。。。

return  return_value;

end;

-- 随机字符串函数 --

delimiter //

drop function if EXISTS rand_string;

create function rand_string(p_length int)

returns varchar(255)

BEGIN

declare chars_str varchar(100) default 'abcdefghigklmnopqrstuvwxyzABCDEFGHIGKLMNUVWXYZ';

declare return_str varchar(255) default '';

declare i int default 0;

while i

set return_str = concat(return_str,substring(chars_str,floor(1+rand()*52),1));

set i=i+1;

end while;

return return_str;

END

//

delimiter //

set global log_bin_trust_function_creators=TRUE;

drop function if EXISTS rand_num;

create function rand_num()

returns int(5)

begin

declare i int default 0;

set i= floor(10+rand()*500);

return i;

end

//

delimiter ;

select rand_string(10);

2、调用方式

select rand_string(10);

存储过程为 call procedure_name();

所有示例代码：

delimiter //

create procedure demo_in_parameter1(in p_in int)

begin

select p_in;

set p_in=2;

SELECT p_in;

end;

//

delimiter ;

set @p_in = 1;

call demo_in_parameter1(@p_in);

select @p_in;

delimiter //

create procedure demo_out_parameter(out p_out int)

begin

SELECT p_out;

set p_out=2;

SELECT p_out;

end;

//

delimiter ;

set @p_out=1;

call demo_out_parameter(@p_out);

select @p_out;

delimiter //

drop PROCEDURE if EXISTS demo_inout_parameter;

create procedure demo_inout_parameter(inout p_inout int)

begin

SELECT p_inout;

set p_inout=2;

SELECT p_inout;

end;

//

delimiter ;

set @p_inout=1;

call demo_inout_parameter(@p_inout);

select @p_inout;

delimiter //

drop PROCEDURE if EXISTS demo_declare;

create PROCEDURE demo_declare(inout p_inout int)

BEGIN

DECLARE l_int int unsigned default 4000000;

DECLARE l_numeric float(8,2) DEFAULT 9.95;

declare l_date date default '1999-12-23';

declare l_datetime datetime default '1999-12-23 23:59:59';

declare l_varchar varchar(255) default 'This will not be padded';

select l_int;

select l_numeric;

select l_date;

select l_datetime;

select l_varchar;

select p_inout;

END ;

//

delimiter ;

set @p_inout=5;

call demo_declare(@p_inout);

select 'Hello world' into @x;

select @x;

set @y = 'goodby cruel world';

select @y;

set @z=1+2+3;

select @z;

delimiter //

drop PROCEDURE if EXISTS GreetWorld;

create procedure GreetWorld(in p_in varchar(32),in p_in_2 int)

begin

set p_in_2=p_in_2+1;

select p_in_2;

select concat(p_in,' World',10);

END

//

delimiter ;

set @greeting = 'Hi ';

set @p_in_2 = 0;

call GreetWorld(@greeting,@p_in_2);

drop PROCEDURE if EXISTS p1;

drop PROCEDURE if EXISTS p2;

create procedure p1() set @last_procedure='p1';

create procedure p2() select concat('Last procedure was ',@last_procedure);

call p1();

call p2();

delimiter //

drop PROCEDURE if EXISTS proc10;

create procedure proc10 #name存储过程名

(in param int)

BEGIN

declare variable1 char(10);

if param = 17 then

set variable1='birds';

else

set variable1='beasts';

end if;

select variable1;

select param;

end

//

delimiter ;

call proc10(20);

select name from mysql.proc where db='develop-212';

select routine_name from information_schea.routines where routine_schema='develop-212';

show procedure status where db='develop-212';

show create procedure `develop-212`.proc10;

delimiter //

create procedure proc11()

BEGIN

declare x1 varchar(5) default 'outer';

BEGIN

declare x1 varchar(5) default 'inner';

select x1;

end;

select x1;

end;

//

delimiter ;

call proc11();

-- if-then-else--

delimiter //

drop PROCEDURE if EXISTS proc12;

create procedure proc12(IN param int)

begin

declare var int;

declare s1 int default 0;

set var=param+1;

if var=0 then

set s1=17;

end if;

if param=0 then

set s1= s1+1;

ELSE

set s1=s1+2;

end if;

select s1;

end;

//

delimiter ;

call proc12(0);

-- case语句 --

delimiter //

drop procedure if EXISTS proc14;

create procedure proc14(in para int)

BEGIN

declare var int;

declare temp int default 0;

set var=para+1;

case var

WHEN 0 THEN

set temp=17;

when 1 THEN

set temp=18;

ELSE

set temp=19;

end case;

select temp;

end;

//

delimiter ;

call proc14(0);

-- while 循环 --

delimiter //

drop PROCEDURE if EXISTS proc15;

create procedure proc15()

BEGIN

declare var int;

set var=0;

while var<6 DO

set var=var+1;

end while;

select var;

end;

//

delimiter ;

call proc15();

delimiter //

drop PROCEDURE if EXISTS proc16;

create procedure proc16()

BEGIN

declare v int;

declare tmp int;

set tmp=5;

set v=0;

REPEAT

set tmp = tmp+2;

set v = v+1;

until v>=5

end repeat;

select v,tmp;

end;

//

delimiter ;

call proc16();

delimiter //

drop PROCEDURE if EXISTS proc17;

create procedure proc17()

BEGIN

declare v int;

declare tmp int;

set v=0;

set tmp=0;

LOOP_LABLE:LOOP

set v=v+1;

set tmp=tmp+3;

if v>=5 THEN

leave LOOP_LABLE;

end if;

end loop;

select v,tmp;

end;

//

delimiter ;

call proc17();

select concat(1,2,3,4,5,6,7);

select charset('hi');

select instr(lcase('hello,World'),'W');

select lcase('hello,World');

BEGIN

DECLARE no_more_record INT DEFAULT 0;

DECLARE pID BIGINT(20);

DECLARE pValue DECIMAL(15,5);

DECLARE cur_record CURSOR FOR SELECT colA, colB from tableABC; /*首先这里对游标进行定义*/

DECLARE CONTINUE HANDLER FOR NOT FOUND SET no_more_record = 1; /*这个是个条件处理,针对NOT FOUND的条件,当没有记录时赋值为1*/

OPEN cur_record; /*接着使用OPEN打开游标*/

FETCH cur_record INTO pID, pValue; /*把第一行数据写入变量中,游标也随之指向了记录的第一行*/

WHILE no_more_record != 1 DO

INSERT INTO testTable(ID, Value)

VALUES (pID, pValue);

FETCH cur_record INTO pID, pValue;

END WHILE;

CLOSE cur_record; /*用完后记得用CLOSE把资源释放掉*/

END

-- mysql游标循环的使用 --

delimiter //

drop procedure if EXISTS sum_money;

create procedure sum_money()

begin

declare p_uid int default 0;

declare p_money DECIMAL(10,2) default 0.0;

declare p_sumMoney DECIMAL(11,2) default 0.0;

declare no_more_record int default 0;

declare cur CURSOR for select uid,money from `ezcm_member` order by uid limit 0,1000;

declare CONTINUE HANDLER for not found set no_more_record=1;

open cur;

fetch cur into p_uid,p_money;

while no_more_record !=1 DO

set p_sumMoney = p_sumMoney+p_money;

fetch cur into p_uid,p_money;

end while;

close cur;

SELECT p_sumMoney;

END

//

delimiter ;

call sum_money();

6867059845.71

376280901.63

376280901.63

select money from ezcm_member order by uid limit 0,1000;

select sum(money) from (select money from ezcm_member order by uid limit 0,1000) as t;

-- 随机字符串函数 --

delimiter //

drop function if EXISTS rand_string;

create function rand_string(p_length int)

returns varchar(255)

BEGIN

declare chars_str varchar(100) default 'abcdefghigklmnopqrstuvwxyzABCDEFGHIGKLMNUVWXYZ';

declare return_str varchar(255) default '';

declare i int default 0;

while i

set return_str = concat(return_str,substring(chars_str,floor(1+rand()*52),1));

set i=i+1;

end while;

return return_str;

END

//

delimiter //

set global log_bin_trust_function_creators=TRUE;

drop function if EXISTS rand_num;

create function rand_num()

returns int(5)

begin

declare i int default 0;

set i= floor(10+rand()*500);

return i;

end

//

delimiter ;

select rand_string(10);

show PROCESSLIST;