SQL%ROWCOUNT

 

 绑定变量输出删除的行数

在plsql的命令窗口中执行，默认打印出绑定变量的值

SQL> VARIABLE rows_deleted NUMBER 

SQL> DECLARE
  2     v_id NUMBER:= 11;

  4  BEGIN
  5     DELETE FROM building WHERE id = v_id;
  6     :rows_deleted := SQL%ROWCOUNT;
  7  END;
  8  /
 
PL/SQL procedure successfully completed
rows_deleted
---------
0
 

正常变量无法通过打印方式输出

SQL> VARIABLE rows_deleted NUMBER

SQL> DECLARE
  2     v_id NUMBER:= 11;

  4  BEGIN
  5     DELETE FROM building WHERE id = v_id;
  6     rows_deleted := SQL%ROWCOUNT;
  7  END;
  8  /
 
PL/SQL procedure successfully completed

只是提示完成过程执行，这个变量要输出的话就必须通过dbms_output过程进行输出才行了。

在sqlplus中执行

SQL> VARIABLE rows_deleted NUMBER
SQL> DECLARE
  2     v_id NUMBER := 11;
  3  BEGIN
  4     DELETE FROM building WHERE id = v_id;
  5     :rows_deleted := SQL%ROWCOUNT;
  6  END;
  7  /

PL/SQL 过程已成功完成。

SQL> print rows_deleted

ROWS_DELETED
------------
           0

 

 如下语句也是在plsql中的命令窗口执行

SQL> VARIABLE rows_deleted NUMBER
SQL> DECLARE
  2     TYPE v_id_table_type IS TABLE OF building.id%TYPE;
  3     v_id_table v_id_table_type;
  4  BEGIN
  5     SELECT ID BULK COLLECT INTO v_id_table FROM building WHERE rownum <= 10;
  6     :rows_deleted := SQL%ROWCOUNT;
  7  END;
  8  /
 
PL/SQL procedure successfully completed
rows_deleted
---------
10