SQL Script in Oracle database..

I am working on writing a scripts in plsql on Oracle 9i database. In that script it update the table and in that I need validate 3 thing be update the table.
1. The user which run scripts should be eg.SCOTT
2. The tablespace which table is there eg. user should have 500mb of free space.
3. The date which user enter to update the record should not be < than 1 year the sysdate
(eg: sysdate is 2012/03/12 it should be less than 2011/03/11)
The date is enter by the user as a user parameter.
Thanks in advance.
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Wasim Akram ShaikCommented:
you can do something like this as you said, the user will have the parameters, to validate the third condition we would need parameters which user will enter..

probably this can  be done via a trigger on that table, however incase you want to do via a plsql script, then better would you give user an api which will accept all the input parameters for updation and validate the incoming date parameter, also the scott would need to have the access to few dba tables, to query the free space, prepared a rough version without any exception handling, you modify this according to your needs..

check this out

   v_user    VARCHAR2 (100) := 'SCOTT';
   v_free    NUMBER;
   v_total   NUMBER;
   v_date    VARCHAR2 (100) := '01-JAN-1986';
   v_days    NUMBER;
     INTO v_user

   IF v_user = 'SCOTT'
      SELECT *
        INTO v_free, v_total
        FROM (SELECT /* + RULE */ df.BYTES / (1024 * 1024) "Size (MB)",
                        SUM (fs.BYTES) / (1024 * 1024) "Free (MB)"
                  FROM dba_free_space fs,
                       (SELECT   tablespace_name, SUM (BYTES) BYTES
                            FROM dba_data_files
                        GROUP BY tablespace_name) df
                 WHERE fs.tablespace_name(+) = df.tablespace_name
                   AND fs.tablespace_name = 'USERS'
              GROUP BY df.tablespace_name, df.BYTES
              UNION ALL
              SELECT /* + RULE */ fs.BYTES / (1024 * 1024),
                        SUM (df.bytes_free) / (1024 * 1024)
                  FROM dba_temp_files fs,
                       (SELECT   tablespace_name, bytes_free, bytes_used
                            FROM v$temp_space_header
                        GROUP BY tablespace_name, bytes_free, bytes_used) df
                 WHERE fs.tablespace_name(+) = df.tablespace_name
                   AND fs.tablespace_name = 'USERS'
              GROUP BY df.tablespace_name,

      IF v_free > 500
         SELECT SYSDATE - TO_DATE (v_date, 'DD-MON-YYYY')
           INTO v_days
           FROM DUAL;

         IF v_date < 365
                    NULL;--- Replace this null with the update statement, such as update emp set hire_date=v_date;
            DBMS_OUTPUT.put_line ('Date Validation is failed');
         END IF;
         DBMS_OUTPUT.put_line ('TableSpace is not free ');
      END IF;
      DBMS_OUTPUT.put_line ('Script Terminated As User is not SCOTT');
   END IF;

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irsbenzAuthor Commented:
irsbenzAuthor Commented:
Excellent straight to point.
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