語法：

1.存儲過程：

create PROCEDURE name(argment_list)

begin

sql_statement;

end

2.觸發(fā)器：

create trigger name (before|after) (insert | update | delete) on table_name

for each row

begin

sql_statement;

end

3.游標:

declare cursor_name cursor for select statement;

4.其他語法

declare var_name int; 聲明變量

setvar_name = 5; 賦值

-- 或者

set @var_name = 5

例子：

CREATE PROCEDURE `procedure_name`()

BEGIN

Declare found boolean default true;

Declare name varchar(20);

Declare names_cursor cursor for SELECT name FROM user;

DECLARE CONTINUE HANDLER FOR NOT FOUND set found=false;

open names_cursor;

name_loop:LOOP fetch names_cursor into name;

if found then

sql_statement;

else

leave name_loop;

end if;

end LOOP name_loop;

close names_cursor;

END

create trigger trigger_name before insert on user

for each row

begin

set @userid = NEW.userid;

set @name = NEW.name;

set @count= (select count(userid) from user where userid=@userid and name = @name);

if @count=1 then

-- this user already exists,throw exception

insert into Error_message_ChannelIdToClientMustBeUnique values(1);

end if;

end

總結(jié)

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