oracle的rowtype使用

1：table_name%ROWTYPE
    declare
   v_t1      t1%rowtype; 
 begin
   select tid,tname into v_t1 from t1 where tid = 1;
   
   dbms_output.put_line(v_t1.tid || ' -- '||v_t1.tname); 
 end;

2: 使用游标
 declare
   cursor cur is select tid,tname from t1 where 1 = 2;
   v_t1   cur%ROWTYPE;
 begin
   select tid,tname into v_t1 from t1 where tid = 1;
   
   dbms_output.put_line(v_t1.tid || ' -- '||v_t1.tname); 
 end;

3   通过record
    declare
   type rec_t1 is record(
   tid     t1.tid%type,
   tname   t1.tname%type
   );
   v_t1   rec_t1;
 begin
   select tid,tname into v_t1 from t1 where tid = 1;
   
   dbms_output.put_line(v_t1.tid || ' -- '||v_t1.tname); 
 end;

4： record嵌套rowtype
 declare
   type rec_t1 is record(
   tb_t1     t1%rowtype
   );
   v_t1   rec_t1;
 begin
   select tid,tname into v_t1.tb_t1 from t1 where tid = 1;
   
   dbms_output.put_line(v_t1.tb_t1.tid || ' -- '||v_t1.tb_t1.tname); 
 end;