如何从 all_views 获取单个视图的总记录数

Question

如何从 all_views 获取单个视图的总记录数。 请找到以下代码以供参考..

Declare
view_name     VARCHAR2(200);
v_str          VARCHAR2 (1000);
v_output     VARCHAR2(4000);

CURSOR tbl IS
     SELECT view_name 
     FROM all_views
     WHERE OWNER = SYS_CONTEXT( 'USERENV', 'CURRENT_SCHEMA')
     ORDER BY 1 ;
BEGIN
OPEN tbl ;
     LOOP
     FETCH tbl INTO view_name;
     EXIT WHEN tbl%NOTFOUND;
          v_str := 'Select '''|| view_name ||'     '' || count (*) from ' || view_name ;
          EXECUTE IMMEDIATE v_str INTO v_output;

          DBMS_OUTPUT.PUT_LINE(v_output);
     END LOOP;
CLOSE tbl;
END;

当前输出：

V_DSP_BUSINESS_DATE            10
V_DSP_DEPARTMENT               20
V_DSP_EMPLOYEE_DEACTIVATED     50
V_DSP_EMPLOYEE_GED             80

预期输出：

sum up the record count of all individual views

i.e 160

请帮忙。

Answer 1

只需修改 LOOP 以总结每次获取 COUNT 的时间。

LOOP
FETCH tbl INTO view_name;
EXIT WHEN tbl%NOTFOUND;
     v_str := 'Select count (*) from ' || view_name ;
     EXECUTE IMMEDIATE v_str INTO v_cnt;
     v_cnt_tot := v_cnt_tot + v_cnt;


END LOOP;
DBMS_OUTPUT.PUT_LINE(v_cnt_tot);

确保声明了v_cnt 和v_cnt_tot 变量。

如果您真的想在LOOP 即row-by-row 中执行此操作，请使用简单的CURSOR FOR LOOP，而不是声明CURSOR。

类似的，

FOR i IN SELECT view_name 
     FROM all_views
     WHERE OWNER = SYS_CONTEXT( 'USERENV', 'CURRENT_SCHEMA')
LOOP
...

Answer 2

非常感谢您的帮助...:) 它奏效了。

请在下面找到最终代码

Declare
view_name     VARCHAR2(200);
v_str          VARCHAR2 (1000);
v_cnt     VARCHAR2(4000);
v_cnt_tot     VARCHAR2(4000);

CURSOR tbl IS
     SELECT view_name 
     FROM all_views
     WHERE OWNER = SYS_CONTEXT( 'USERENV', 'CURRENT_SCHEMA')
     ORDER BY 1 ;

BEGIN
 v_cnt_tot := 0;
OPEN tbl ;
     LOOP
     FETCH tbl INTO view_name;
     EXIT WHEN tbl%NOTFOUND;
          v_str := 'Select  count (*) as count from ' || view_name ;
          EXECUTE IMMEDIATE v_str INTO v_cnt;
          v_cnt_tot := v_cnt_tot + v_cnt;


     END LOOP;
    DBMS_OUTPUT.PUT_LINE(v_cnt_tot);
CLOSE tbl;
END;