Question

尝试将查询的结果（owner，object_name）提供给DBMS_STATS我尝试了以下PL / SQL片段：

DECLARE
  CCLOB  VARCHAR2(500);
  BEGIN
   FOR rec IN (
            select o.owner own,o.object_name obn
            from sys.col_group_usage$ cg,dba_objects o
             where cg.obj#=o.object_id
             group by owner,object_name
               )
   LOOP
      DBMS_OUTPUT.put_line (rec.own||' '||rec.obn);
      SELECT dbms_stats.report_col_usage(ownname =>'''rec.own''', tabname =>'''rec.obn''') into CCLOB from dual;
      DBMS_OUTPUT.PUT_LINE(CCLOB);
   END LOOP;
END;
/

但结果是：

DWI DWATOBP
ORA-20001: 'REC.OWN' is an invalid identifier

################SNPI#################

AGUN RDC
ORA-20001: 'REC.OWN' is an invalid identifier

PL/SQL procedure successfully completed.

代码的一些变体及其错误：

a）没有引号：

SELECT dbms_stats.report_col_usage(ownname =>rec.own, tabname =>rec.obn) into CCLOB from dual;

DWI DWATOBP
DECLARE
*
ERROR at line 1:
ORA-06502: PL/SQL: numeric or value error
ORA-06512: at line 14

b）单引号：

SELECT dbms_stats.report_col_usage(ownname =>'rec.own', tabname =>'rec.obn') into CCLOB from dual;

DWI DWATOBP
ORA-20001: REC.OWN is an invalid identifier

c）有两个单引号：

SELECT dbms_stats.report_col_usage(ownname =>''rec.own'', tabname =>''rec.obn'') into CCLOB from dual;

ERROR at line 14:
ORA-06550: line 14, column 54:
PL/SQL: ORA-00907: missing right parenthesis
ORA-06550: line 14, column 7:
PL/SQL: SQL Statement ignored

Answer 1

将参数传递给＆＃39;＆＃39;＆nbsp;＆＃39;＆＃39;＆＃39;＆＃39;＆＃39;和＆＃39;＆＃39; rec.obn＆＃39;＆＃39;＆＃39;，你实际上是在传递字符串：＆＃39; rec.own＆＃39;和＆＃39; rec.obn＆＃39;。这些都不是有效的标识符名称！

删除单引号，它应该有效。

ETA：另外，将变量CCLOB更改为CLOB数据类型，因为dbms_stats.report_col_usage返回CLOB。

是否可以在PL / SQL中创建一个带有结果集的SQL过程的for循环？

1 个答案: