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Status Future consideration
Workspace Informix
Components Informix Server
Created by Guest
Created on Nov 19, 2013

The function LENGTH () also for BLOBs / CLOBs

Unfortunately, there is no SQL statement that returns the size of the blob. You have to use an external program to get such information. I wish the sql function length() worked for BLOBs/CLOBs.
  • Guest
    Apr 29, 2022

    This might seem minor - BUT is a BIG deal. Please consider increasing the priority - I know it is technically challenging but is a critical real-world need.

  • Guest
    Dec 2, 2020

    The DBMS_LOG package which has been included with Informix for many years, includes the function dbms_lob_getlength() which returns the length of a BLOB or CLOB type column. It is easy to create a function that maps the same function but is named "length" taking a CLOB or BLOB. You can enable that function by registering the excompat package in your database:

    execute function sysbldprepare( 'excompat.*', 'create' );


    > select dbms_lob_getlength( two ) from clob_test;



    And you can create the length() functions:

    > create function length( blob ) returns integer
    external name "$INFORMIXDIR/extend/excompat.1.0/excompat.bld(dbms_lob_getlength)" language c;

    > alter function length( blob ) with (Modify External Name = "$INFORMIXDIR/extend/excompat.1.0/excompat.bld(dbms_lob_getlength)");

    > create function length( clob ) returns integer
    external name "$INFORMIXDIR/extend/excompat.1.0/excompat.bld(dbms_lob_getlength)" language c;

    > alter function length( clob ) with (Modify External Name = "$INFORMIXDIR/extend/excompat.1.0/excompat.bld(dbms_lob_getlength)");

    After which:

    > select length( two ) from clob_test;



    1 row(s) retrieved.


  • Guest
    Oct 8, 2019

    Las version 14.10.xC2 allows to cast CLOB to LVARCHAR.


    I've not tested it, but maybe you can now execute