Mysql存储过程知识,案例
Mysql存储过程知识,案例:
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create procedure delete_setting( in
p_settingid integer) begin delete from setting where settingid=p_settingid; end select `name` from mysql.proc where db = ‘your_db_name‘
and `type` = ‘PROCEDURE‘ show procedure status; show create procedure proc_name; show create function
func_name; 局部变量 create procedure test3(out number1 integer) begin declare number2 integer default
100; set number1=number2; end call test(@number) select @number # 默认值为标量子查询 create procedure test2(out ta integer) begin declare tt integer default
(select count(*) from `setting`); set ta=tt; end 流程控制 IF create procedure getMax( in
p1 integer, in
p2 integer,out p3 integer) begin if
p1>p2 then set p3 = p1; elseif p1<p2 then set p3 = p2; else set p3=0; end if ; end fibonnaci create procedure fibonnaci(inout n1 integer,inout n2 integer,inout n3 integer) begin set n3=n1+n2; if
n3>1000 then set n3 = n3-1000; end if ; set n1=n2; set n2=n3; end create procedure largest(out t char(30)) begin if
(select count(*) from product)>(select count(*) from productcategory) then set t= "product" ; elseif (select count(*) from product)<(select count(*) from productcategory) then set t= "productcategory" ; else set t = "equal" ; end if ; end create procedure small_exit(out p1 integer,out p2 integer) begin set p1 = 1; set p2 = 2; block1:begin leave block1; set p2 = 3; end; set p1=4; end WHILE 计算两个相差的年月日 create procedure age( in
start_date date, in
end_date date, out years integer, out monthes integer, out days integer ) begin declare next_date,previous_date date; set years = 0; set previous_date=start_date; set next_date =start_date+interval 1 year; while
next_date<end_date do set years = years+1; set previous_date = next_date; set next_date = next_date+ interval 1 year; end while ; set monthes = 0; set next_date = previous_date + interval 1 month; while
next_date<end_date do set monthes = monthes +1; set previous_date=next_date; set next_date = previous_date+interval 1 month; end while ; end ———————————————————————— 调用存储过程 建表 create table players_with_parents (playerno integer not null
primary key, father_playerno integer, mother_playerno integer); alter table players_with_parents add constraint fk_1 foreign key (father_playerno) references player_with_parents (playerno); alter table players_with_parents add foreign key (mother_playerno) references player_with_parents(playerno); 增加外键约束; insert into players_with_parents values(9, null , null ),(8, null , null ),(7, null , null ),(6, null , null ),(5, null , null ) ,(4,8,9),(3,6,7),(2,4,5),(1,2,3) create procedure total_number_of_parents(in_playerno integer,inout number integer) begin declare v_father,v_mother integer; set v_father = (select father_playerno from players_with_parents where playerno=in_playerno); set v_mother = (select mother_playerno from players_with_parents where playerno=in_playerno); if
v_father is not null
then call total_number_of_parents(v_father,number); set number = number+1; end if ; if
v_mother is not null
then call total_number_of_parents(v_mother,number); set number = number+1; end if ; end set max_sp_recursion_depth=100; select into create procedure total_setting(out p1 integer) begin select count(*) into p1 from `setting`; end create procedure get_setting(out v_name varchar(60),out v_value varchar(60)) begin select `name`,`value` into v_name,v_value from setting limit 0,1; end create procedure showErr(out p integer) begin set p=1; insert into `setting` (`settingid`,`name`)values(12, ‘vname‘ ); set p=2; end create procedure showErr(out p integer,out error integer) begin declare continue
handler for
sqlstat ‘23000‘ set error = ‘200000‘ ; declare continue
handler for
sqlstat ‘23001‘ ; set error = ‘200001‘ ; set error = ‘000000‘ ; set p=1; insert into `setting` (`settingid`,`name`)values(12, ‘vname‘ ); set p=2; end declare continue
handler for
1062 set error= ‘23000‘ ; declare continue
handler for
1136 set error= ‘21S01‘ ; 01 SQLWARING 02 NOT FOUND SQLEXCEPTION 01,02以外的 create procedure addDate(out error char(5)) begin declare continue
handler for
sqlstate ‘23000‘
set error= ‘23000‘ ; declare continue
handler for
sqlstate ‘21S01‘
set error= ‘21S01‘ ; set error= ‘00000‘ ; insert into `setting` values(15, ‘test‘ , ‘testValue‘ ,10); end declare non_unique condition for
sqlstate ‘23000‘ ; ddeclare continue
handler for
non_unique set error= ‘23000‘ ; 同一块中,相同的错误,不能有两个或多个处理程序; 带有游标的存储过程 declare c_players cursor for
select playerno from players; create procedure number_of_players(out number integer) begin declare a_playerno integer; declare found boolean default
true ; declare c_players cursor for
select playerno from players; declare continue
handler for
not found set found= false ; set number=0; open c_players; fetch c_players into a_playerno; while
found do set number =number+1; fetch c_players into a_playerno; end while close c_players; end create procedure number_of_setting(out number integer) begin declare a_settingid integer; declare found boolean default
true ; declare c_settingids cursor for
select settingid from setting; declare continue
handler for
not found set found= false ; set number=0; open c_settingids; fetch c_settingids into a_settingid; while
found do set number=number+1; fetch c_settingids into a_settingid; end while ; close c_settingids; end create procedure delete_older_than_30() begin declare v_age,v_playerno,v_years,v_months,v_days integer; declare v_birth_date date; declare found boolean default
true ; declare c_players cursor for select playerno,birth_date from players; declare continue
handler for
not found set found= false ; open c_players; fetch c_players into v_playerno,v_birth_date; while
found do call age(v_birth_date,now(),v_years,v_months,v_days); if
v_years>30 then delete
from penalties where playerno=v_playerno; end if ; fetch c_players into v_playno,v_birth_date; end while ; close c_players; end commit,rollback,start transaction; create function
test(t1 integer,t2 integer) returns integer begin return
t1+t2; end |
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