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Oracle PL/SQL Programming: A Developer's Workbook
book

Oracle PL/SQL Programming: A Developer's Workbook

by Steven Feuerstein, Andrew Odewahn
May 2000
Intermediate to advanced content levelIntermediate to advanced
594 pages
11h 32m
English
O'Reilly Media, Inc.
Content preview from Oracle PL/SQL Programming: A Developer's Workbook

Intermediate

Q:

13-5.

Here is the enhanced table count function:


/* Filename on web page: tabcount81-2.sf */
CREATE OR REPLACE FUNCTION tabcount (
   nm IN VARCHAR2,
   whr IN VARCHAR2 := NULL)
   RETURN PLS_INTEGER
IS
   retval PLS_INTEGER;
   v_where VARCHAR2(2000) := whr;
BEGIN
   IF UPPER (whr) NOT LIKE 'WHERE %'
   THEN
      v_where := 'WHERE ' || v_where;
   END IF;

   EXECUTE IMMEDIATE
      'SELECT COUNT(*) FROM ' || nm || ' ' || v_where
      INTO retval;
   RETURN retval;
END;
/

Q:

13-6.

Just construct the appropriate DDL statement, and the deed is done:


/* Filename on web page: dropit.sp */
CREATE OR REPLACE PROCEDURE dropit (
   ittype IN VARCHAR2, itname IN VARCHAR2)
IS
BEGIN
   EXECUTE IMMEDIATE 'drop ' || ittype || ' ' || itname;
END;
/

Q:

13-7.

You cannot use placeholders for schema elements of the dynamic SQL statement. What is a schema element? It’s the name of an element in your schema: table, column, view, object type, etc. If you have variable schema elements, you must use concatenation to incorporate that variable name into the SQL string.

Q:

13-8.

Here is a generic procedure:

 /* Filename on web page: runddl81.sp */ CREATE OR REPLACE PROCEDURE runddl (ddl_in in VARCHAR2) AUTHID CURRENT_USER IS BEGIN EXECUTE IMMEDIATE ddl_in; ...
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Publisher Resources

ISBN: 9781449324070Supplemental ContentErrata Page