Copying Internal LOBs : Clob « Data Type « Oracle PL / SQL






  1. Oracle PL / SQL
  2. Data Type
  3. Clob

Copying Internal LOBs

  
SQL>
SQL> CREATE TABLE LOBS(
  2       lob_index INTEGER,
  3       CLOB_Locator CLOB);

Table created.

SQL>
SQL>
SQL> INSERT INTO LOBS VALUES(1,'Teach Yourself Oracle8i in 21 Days');

1 row created.

SQL> INSERT INTO LOBS VALUES(2,'Oracle Data Warehousing Unleashed');

1 row created.

SQL> INSERT INTO LOBS VALUES(3,'');

1 row created.

SQL> INSERT INTO LOBS VALUES(4,'Oracle Unleashed 2E');

1 row created.

SQL> INSERT INTO LOBS VALUES(5,EMPTY_CLOB());

1 row created.

SQL> INSERT INTO LOBS VALUES(6,EMPTY_CLOB());

1 row created.

SQL>
SQL> DECLARE
  2      Source_Lob   CLOB;
  3      Dest_Lob   CLOB;
  4      Copy_Amount INTEGER;
  5  BEGIN
  6      SELECT CLOB_LOCATOR into Dest_LOB
  7           FROM LOBS
  8           WHERE LOB_INDEX = 5 FOR UPDATE; -- FOR UPDATE locks the ROW
  9      SELECT CLOB_LOCATOR into Source_LOB
 10           FROM LOBS
 11           WHERE LOB_INDEX = 1;
 12      Copy_Amount := DBMS_LOB.GETLENGTH(Source_Lob);
 13      DBMS_LOB.COPY(Dest_LOB, Source_LOB,Copy_Amount);
 14      COMMIT;
 15      SELECT CLOB_LOCATOR into Dest_LOB
 16           FROM LOBS
 17           WHERE LOB_INDEX = 6 FOR UPDATE;
 18      SELECT CLOB_LOCATOR into Source_LOB
 19           FROM LOBS
 20           WHERE LOB_INDEX = 2;
 21      Copy_Amount := DBMS_LOB.GETLENGTH(Source_Lob);
 22      DBMS_LOB.COPY(Dest_LOB, Source_LOB,Copy_Amount);
 23      COMMIT;
 24  END;
 25  /

PL/SQL procedure successfully completed.

SQL> drop table lobs;

Table dropped.

SQL>
SQL> --








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