dbanullbind

Associates an indicator variable with a compute-row column.

Syntax

RETCODE dbanullbind (
PDBPROCESS
dbproc,
INT
computeid,
INT
column,
LPCDBINT
indicator );

Arguments
dbproc
Is the DBPROCESS structure that is the handle for a particular workstation/ Microsoft® SQL Server™ process. It contains all the information that DB-Library uses to manage communications and data between the workstation and SQL Server.
computeid
Is the ID that identifies the COMPUTE clause. A SELECT statement can have multiple COMPUTE clauses, which can have varying numbers of aggregate operators and aggregate targets. The computeid is returned by dbnextrow or dbgetrow. A value of 1 is the computeid corresponding to the first compute clause in a SELECT statement.
column
Is the number of the column to be associated with the indicator variable.
indicator
Is a pointer to the indicator variable.

Note The indicator parameter is just the pointer to the indicator variable. The variable itself is set.


Returns

SUCCEED or FAIL. The dbanullbind function returns FAIL if computeid or column is invalid.

Remarks

The indicator variable reveals whether a particular compute-row column has been converted and copied to a program variable successfully or unsuccessfully, or whether it is NULL. Call dbanullbind only after dbnextrow or dbgetrow returns a computeid.

The indicator variable is set when compute rows are processed through dbnextrow. The possible values are:


Note Detection of character string truncation is implemented only for CHARBIND and VARYCHARBIND.


See Also
dbadata dbnextrow
dbadlen dbnullbind
dbaltbind  

  


(c) 1988-98 Microsoft Corporation. All Rights Reserved.