MySQL实现两张表数据的同步

begin
set @disable=1;
if @disable=1 and NOT EXISTS(SELECT 1 FROM tableB where ID=new.ID) then  
  insert into tableB (ID,对应字段1) values(new.ID,new.对应字段1);
end if; 
set @disable=0;
end

begin
set @disable=1;
if @disable=1 and NOT EXISTS(SELECT 1 FROM tableA where ID=new.ID) then  
  insert into tableA (ID,对应字段1) values(new.ID,new.对应字段1);
end if; 
set @disable=0;
end