軟件測試中Mysql存儲過程實例

## ************光標****************
#<7>光標必須在聲明處理程序之前被聲明，并且變量和條件必須在聲明光標或處理程序之前被聲明
#在這里先聲明變量a,b,c,后聲明cursor
create procedure curdemo()
begin
declare done int default 0;
declare a char(16);
declare b,c int;
declare cur1 cursor for select id,name from proce;
declare cur2 cursor for select id from proce2;
declare continue handler for sqlstate '02000' set done=1;

open cur1;
open cur2;

repeat
fetch cur1 into b,a;
fetch cur2 into c;
if not done then
   if b<c then
     insert into proce3 values(b,a);
   else
     insert into proce3 values(c,a);
   end if;
end if;
until done end repeat;

close cur1;
close cur2;
end

## **************** Case *******************
#<8>when ... then ;case ... end case;
delimiter //
DROP procedure IF EXISTS p13
//
create procedure p13(in par1 int)
begin
declare var1 int;
set var1=par1+1;

case var1
when 0 then insert into casetest values(17);
when 1 then insert into casetest values(18);
else insert into casetest values(19);
end case;
end;
//

call p13(-1)//
call p13(0)//
call p13(1)//
call p13(null)//

## **************** while ****************
#<9>while ... do ... end while;為了防止null的錯誤，set v=0是必須的
delimiter //
DROP procedure IF EXISTS p14
//

create procedure p14()
begin
declare v int;
set v=0;
while v < 5 do
      insert into casetest values (v);
      set v=v+1;
end while;
end;//

call p14()//

## ***************** repeat *****************
#<10>repeat ...until ... end repeat; 是執行后檢查（until v>=5），而while是執行前檢查(while v<5)
delimiter //
DROP procedure IF EXISTS p15
//

create procedure p15()
begin
declare v int;
set v=0;
repeat
    insert into casetest values(v);
    set v=v+1;
until v >=5

end repeat;

end;
//

call p15()//

## ***************** loops *****************
#<11> loop 和while一樣不需要初始條件，同時和repeat一樣不需要結束條件
#      loop_label: loop
#      ...
#       if .. then
#       leave loop_label
#       end if
#      end loop

delimiter //
DROP procedure IF EXISTS p16
//

create procedure p16()
begin
declare v int;
set v=0;
loop_label: loop
    insert into casetest values(v);
    set v=v+1;
    if v >=5 then
      leave loop_label;
    end if;
end loop;
end;//

call p16()//

## ***************** Labels *****************
# <12>labels標號； 注意此處的until 0=0后面沒有分號“;”
delimiter //
DROP procedure IF EXISTS p17//

create procedure p17()
label_1:begin

label_2:while 0=1 do leave label_2; end while;

label_3:repeat leave label_3;until 0=0 end repeat;

label_4:loop leave label_4; end loop;

end;//

call p17()//

#<13>labels 標號結束符；
delimiter //
DROP procedure IF EXISTS p18//

create procedure p18()
label_1:begin

label_2:while 0=1 do leave label_2; end while label_2;

label_3:repeat leave label_3;until 0=0 end repeat label_3;

label_4:loop leave label_4; end loop label_4;

end label_1;//

call p18()//

#<14>leave和labels 跳出和標號;leave 使程序跳出復雜的語句
delimiter //
DROP procedure IF EXISTS p19//

create procedure p19(par char)

label_1:begin
label_2:begin
label_3:begin

if par is not null then
if par='a' then leave label_1;
else
   begin
     if par='b' then
       leave label_2;
     else
       leave label_3;
     end if;
   end;
end if;
end if;

end label_3;
end label_2;
end label_1;

//

call p19('a')//

#<15>iterate迭代，必須用leave;iterate意思是重新開始復合語句，相當于 continue
#該結果中3將不被保存到數據庫表中
delimiter //
DROP procedure IF EXISTS p20//

create procedure p20()
begin
declare v int;
set v=0;
loop_label:loop

    if v=3 then
      set v=v+1;
      iterate loop_label;
    end if;
    insert into casetest values(v);
    set v=v+1;

    if v>=5 then
      leave loop_label;
    end if;

end loop loop_label;
end;//

call p20()//

#<16>Grand combination大組合

delimiter //
DROP procedure IF EXISTS p21//

create procedure p21(in par1 int,out par2 int)
language sql deterministic sql security invoker
begin
declare v int;

label goto_label;

start_label:loop
    if v=v then
      leave start_label;
    else
      iterate start_label;
    end if;
end loop start_label;

repeat
    while 1=0 do begin end;
    end while;
until v=v
end repeat;

goto goto_label;

end;
//

call p21()//

## **************** trigger ***************************
#<17>
use testprocedure;

CREATE TABLE trig1(a1 int);
CREATE TABLE trig2(a2 int);
CREATE TABLE trig3(a3 int not null AUTO_INCREMENT PRIMARY KEY);

CREATE TABLE trig4(
a4 INT NOT NULL AUTO_INCREMENT PRIMARY KEY,
b4 INT DEFAULT 0
);

insert into trig3(a3) values(null),(null),(null),(null),(null),(null),(null),(null),(null),(null);
insert into trig4(a4) values(0),(0),(0),(0),(0),(0),(0),(0),(0),(0);

delimiter //
DROP trigger trigtest//

create trigger trigtest before insert on trig1
for each row begin
insert into trig2 set a2=NEW.a1;
delete from trig3 where a3=NEW.a1;
update trig4 set b4=b4+1 where a4=NEW.a1;
end;
//

delimiter ;

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