[freetds] Bulkcopy in ct-lib

Lowden, James K LowdenJK at bernstein.com
Wed Feb 4 10:50:50 EST 2004


> From: Thompson, Bill D (London) [mailto:bill_d_thompson at ml.com]
> Sent: February 4, 2004 7:21 AM
> 
> I'm working on and off - mostly off at the moment :-(  on the 
> bulk library
> parts of ct-lib
> 
> I'd been working on the premise, as agreed, that we would move common
> functionality into libtds, and have the ct-library and 
> dblibrary functions
> call the common functions.
> 
> having started to cut the code, I'm beginning to doubt the 
> wisdom of this,

Bill, you've looked at it and arrived at a conclusion.  I trust your judgement.  I'm sure you won't duplicate code; where you find commonality, you'll use it.  

It does sound to me like db-lib is a subset of ct-lib (once again).  If libtds had a tds_blk_bind() that supported ct-lib's bidirectionality, db-lib could call it, but only one way.  

As a design objective, IMO all wire services handled in libtds.  By that, I mean most of the functions in read.c and write.c should be used only by libtds; the client libraries should use higher level abstractions, things that insulate them from endianism and protocol flavors.  I hope the rewrite will push those kinds of low-level decisions down from db-lib to libtds, and that we won't introduce more wire handling in ct-lib.  

Does that seem like a feasible, useful guideline to you?  

Do you still want me to add src/tds/bcp.c?  

--jkl

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