数据库触发器DB2和SqlServer有哪些区别

CREATE TRIGGER EAS.trName  
 NO CASCADE BEFORE insert //插入触发器 
 ON eas.T_user  
 REFERENCING NEW  AS N_ROW //把新插入的数据命名为N_ROW 
 FOR EACH ROW MODE DB2SQL //每一行插入数据都出发此操作 
BEGIN ATOMIC //开始 
DECLARE U_xtfidemp1 varchar(36); //定义变量 
DECLARE u_xtempcode1 varchar(20); 
DECLARE u_xtempcodeCount int ; 
DECLARE U_xtfidempCount int ; 
DECLARE u_id1 int ; 
set U_xtfidemp1=N_ROW.U_xtfidemp;//把新插入的数据赋值给变量 
set u_xtempcode1=N_ROW.u_xtempcode; 
set u_id1=N_ROW.u_id; 
 set u_xtempcodeCount= (select count(u_xtempcode) from eas.T_user where u_xtempcode is not null and u_xtempcode=u_xtempcode1 and u_id<>u_id1); 
 set U_xtfidempCount=(select count(U_xtfidemp) from eas.T_user where U_xtfidemp is not null and U_xtfidemp=U_xtfidemp1 and u_id<>u_id1); 
 IF u_xtempcodeCount>0 or U_xtfidempCount>0 THEN 
　　    SIGNAL SQLSTATE '80000' ('eas.T_user Exceeds u_xtempcode,U_xtfidemp 插入数据时有错误,有重复'); 
　　END IF; 
END 

CREATE TRIGGER EAS.trName  
 for insert //插入触发器 DB2 写法 NO CASCADE BEFORE insert  
 ON eas.T_user  
  //SQL Server没有 把新插入的数据命名为N_ROW REFERENCING NEW  AS N_ROW 
   //SQL Server没有  FOR EACH ROW MODE DB2SQL  
BEGIN // SQL Server没有  ATOMIC //开始 
DECLARE @U_xtfidemp1 varchar(36); //定义变量 DB2 写法 没有@ 
DECLARE @u_xtempcode1 varchar(20); 
DECLARE @u_xtempcodeCount int ; 
DECLARE @U_xtfidempCount int ; 
DECLARE @u_id1 int ; 
//set U_xtfidemp1=N_ROW.U_xtfidemp; 
//set U_xtfidemp1=N_ROW.U_xtfidemp 
//set u_xtempcode1=N_ROW.u_xtempcode; 
 -- 从inserted临时表中获取记录值 //把新插入的数据赋值给变量 
  select @U_xtfidemp1 = U_xtfidemp, 
      @u_xtempcode1 = u_xtempcode, 
      @u_id1 = u_id  
      from inserted 
 set @u_xtempcodeCount= (select count(u_xtempcode) from eas.T_user where u_xtempcode is not null and u_xtempcode=@u_xtempcode1 and u_id<>@u_id1); 
 set @>U_xtfidempCount=(select count(U_xtfidemp) from eas.T_user where U_xtfidemp is not null and U_xtfidemp=@U_xtfidemp1 and u_id<>@u_id1); 
 IF@u_xtempcodeCount>0 or @U_xtfidempCount>0 THEN 
　　  //  SIGNAL SQLSTATE '80000' ('eas.T_user Exceeds u_xtempcode,U_xtfidemp 插入数据时有错误,有重复');　　 END IF; 
END