MS SQL Server Concepts and Programming Question:

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Answer #1
When you call mssql_query() to execute a SQL statement, and the execution failed on the SQL Server, you can use mssql_get_last_message() function to retrieve the error messages.

The tutorial script below shows you a good example:

<?php
$con = mssql_connect('LOCALHOST','sa','GlobalGuideLine');
mssql_select_db('GlobalGuideLineDatabase', $con);

# dropping a table
$sql = 'DROP TABLE fyi.center';
$res = mssql_query($sql, $con);
if (!$res) {
print("Execution failed: ");
print(" Error: ".mssql_get_last_message()." ");
} else {
print("Execution was successful. ");
}

mssql_close($con);
?>

Answer #2

If you run this script for the first time, you will get this output:

Execution was successful.

If you run this script again, the SQL statement will fail on the SQL Server, and you will get:

Warning: mssql_query(): message: Cannot drop the table
'globalguideline', because it does not exist or you do not
have permission. (severity 11) in C: estglobalguideline.php
on line 7

Execution failed:
Error: Cannot drop the table 'fyi.center', because
it does not exist or you do not have permission.