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C, ODBC, and MSAccess

Posted on 1997-04-07
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Last Modified: 2012-05-04
I'm writing a program in C using VisulC vers. 1.5 (16 bit), an ODBC driver and a database mdb (MSAccess vers. 2.0).
I have troubles writing a query with a date in the WHERE condition. This code doesn't work:
DATE_STRUCT my date;
SQLPrepare(hstm,"SELECT * FROM TAB WHERE DATE=(?),SQL_NTS);
SQLSetParam(hstm,1,SQL_C_DATE,SQL_DATE,0,0,&mydate,NULL);
mydate.year=1997;
mydate.month=2;
mydate.day=1;
SQLExecute(hstm);
The same code with a string variable in the WHERE condition works perfectly.
Thank you.
Valerio.
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Question by:valerio
4 Comments
 
LVL 4

Expert Comment

by:emmons
ID: 1249835
Get rid of the parens around the question mark (in the line
beginning with DATE) and see if that helps.
0
 

Author Comment

by:valerio
ID: 1249836
May be this can help you:
the following code works without problems:

char mystr[5];
strcpy(mystr,"XXXX");
SQLPrepare(hstm,"SELECT * FROM TAB WHERE STR=(?),SQL_NTS);
SQLSetParam(hstm,1,SQL_C_CHAR,SQL_CHAR,4,0,&mystr,NULL);
SQLExecute(hstm);

I have problems only with a date variable.
Thank you
Valerio
0
 

Expert Comment

by:rhg
ID: 1249837
First, you have to locate the cause of the problem (Driver
Manager, Jet Engine etc.). In order to do this, you should
obtain the return code of SQLSetParam() and SQLExecute().
If one of them is SQL_ERROR or SQL_SUCCESS_WITH_INFO, you should
call SQLError() in order to obtain the SQLSTATE and the error
description. Anything else is just guessing.

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Accepted Solution

by:
prade earned 100 total points
ID: 1249838
try to initialize "mydate" BEFORE calling the SQLSetParam()
i think SQLSetParam() will make a copy and won't notice later
changes on "mydate"...
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