AW: Dynamic SQL

Hi,

Select ... Into is not allowed in dynamic SQL.
If you want to execute this SQL statement dynamically you have to define a
cursor:

/Free
MySQLStm = 'Select Count(*) from ' + MyTable;
Exec SQL Prepare DynSQLCsr1 From :MySQLStm;
//Check for SQLState/SQLSTT or SQLCODE/SQLCOD

Exec SQL Declare CsrC1 Cursor For DynSQLCsr1;
//Check for SQLState/SQLSTT or SQLCODE/SQLCOD

Exec SQL Open CsrC1;
//Check for SQLState/SQLSTT or SQLCODE/SQLCOD

Clear w_Count;
Exec SQL Fetch Next From CsrC1 into :w_Count;
//Check for SQLState/SQLSTT or SQLCODE/SQLCOD

Exec SQL Close CsrC1;
//Check for SQLState/SQLSTT or SQLCODE/SQLCOD
/End-Free

An other way would be to use static SQL in combination with executing an
OVRDBF immediately before the SELECT ... Into statement.

/Free
MyCLStm = 'OVRDBF X ....'
QCmdExc(MyCLStm: %Len(MyCLStm));
Clear w_Count;
Exec SQL Select Count(*) into :w_Count from x;
//Check for SQLState/SQLSTT or SQLCODE/SQLCOD
/End-Free

Mit freundlichen Grüßen / Best regards

Birgitta Hauser

"Shoot for the moon, even if you miss, you'll land among the stars." (Les
Brown)
"If you think education is expensive, try ignorance." (Derek Bok)
"What is worse than training your staff and losing them? Not training them
and keeping them!"

-----Ursprüngliche Nachricht-----
Von: midrange-l-bounces@xxxxxxxxxxxx
[mailto:midrange-l-bounces@xxxxxxxxxxxx] Im Auftrag von Fleming, Greg (ED)
Gesendet: Monday, July 02, 2007 23:06
An: Midrange Systems Technical Discussion
Betreff: Dynamic SQL


I'm trying to prepare a dynamic SQL statement, and the "prepare" statement
is giving me an error "host variable not defined or not usable".

Here's the statement:

<snip>

w_SQLString = 'Select Count(*) into :w_Count From MKCUSW';

Exec SQL Prepare w_SQLStmnt from :w_SQLString;

Exec SQL Execute w_SQLStmnt;

</snip>

Ultimately, I'm planning to substitute a variable for the file name in when
I populate my string, but since it wasn't working I simplified it to this
version, and it still doesn't work.

I know my :w_count variable is defined OK, because if I make it static SQL,
this statement works:

<snip>

Exec SQL Select Count(*) into :w_Count from MKCUSW;

</snip>

Can I not use host variables in dynamic SQL ?



Thanks



Greg Fleming

Senior Programmer/Analyst

Everglades Direct, Inc.