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Status Future consideration
Workspace IBM i
Categories Db2 for i
Created by Guest
Created on Aug 1, 2023

SQLRPGLE precompiler - SQLTYPE(CLOB:x) to VARCHAR instead of to DS

Add a d-spec and/or ctl-opt keyword to instruct the SQL precompiler to convert SQLTYPE(CLOB:x) (and BLOB etc.) to VARCHAR(x:4) instead of the UNS(10)/CHAR(x) DS that it currently converts to.

// This
dcl-s myVar1 SQLTYPE(CLOB:X);
// Pecompiles to this:
dcl-ds myVar1;
myVar_LEN UNS(10);
myVar_DATA CHAR(x);

// But this
dcl-s myVar2 SQLTYPE(CLOB:X:*VAR);
// Pecompiles to this:
dcl-s myVar2 VARCHAR(x:4);

// And this:
// Applies *VAR globally to the program - makes all SQLTYPE(CLOB:X) act like SQLTYPE(CLOB:X:*VAR)

This would have the benefit of allowing CLOBs to be directly used with regular RPGLE BIFs such as %trim, %scan, %xlate, etc. with no conversion, and no need to reference different variants of the variable name in different circumstances. All of this serves to simplify the use of CLOB columns in SQLRPGLE processing.

A VARCHAR(x:4) has an identical structure in memory to the DS (4 bytes unsigned int for length, then x bytes character), and the SQL precompiler, when it converts SQL statements, references with with %ADDR so I think this would be a pure precompiler change?

Thanks to Scott Klement, and JonBoy of, for the discussion - sorry I forgot about it for so long!

Idea priority Medium
  • Admin
    Carmelita Ruvalcaba Cevallos
    Apr 23, 2024

    The CAAC has reviewed this IBM Idea and recommends that IBM view this as a high priority Idea that is important to be addressed.

    This is as value, as more and more webservices are being used and varchar being the preferred character set.

    Background: The COMMON Americas Advisory Council (CAAC) members have a broad range of experience in working with small and medium-sized IBM i customers. CAAC has a key role in working with IBM i development to help assess the value and impact of individual IBM Ideas on the broader IBM i community and has therefore reviewed your Idea.

    For more information about CAAC, see

    Carmelita Ruvalcaba - CAAC Program Manager

  • Guest
    Aug 29, 2023
    IBM will use this Idea as input to planning, but no commitment is made or implied. This Idea will be updated in the future if IBM implements it.

    Db2 for i development team
    IBM Power Systems Development