如何使用 PDO 和 SQL 服务器获取最后插入行的 ID？

Question

Under other circumstances I might be tempted to use

$result = mssql_query("INSERT INTO table (fields) VALUES (data); 
                       SELECT CAST(scope_identity() AS int)");

but as I will be inserting user-submitted data, I want to continue to use PDO, which returns an empty array.

Unfortunately, I'm running PHP on a Linux server and using dblib to interface with Microsoft SQL Server, which doesn't support PDO::lastInsertID() .

Please help!

Update to include code example

Here's the code I'm using: col1 is a field of type int identity and col2 is a datetime with a default of getdate() .

//  Connect to db with PDO
$pdo = new PDO( 'dblib:host=' . $host . ';dbname=' . $database . ';', $username, $password, array(PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION) );
//  Connect to db with MSSQL
$sql = mssql_connect( $host, $username, $password );
mssql_select_db( $database, $sql );
//  Create SQL statement
$query = "INSERT INTO [table] ( col3, col4, col5 )
          VALUES ( 'str1', 'str2', 'str3' );
          SELECT SCOPE_IDENTITY() AS theID;";
//  Run with MSSQL
echo "Using MSSQL...\n";
$result = mssql_query( $query );
$the_id = mssql_result( $result, 0, 'theID' );
echo "Query OK. Returned ID is " . $the_id . "\n";
// Run with PDO
echo "\nUsing PDO...\n";
$stmt = $pdo->query( $query );
$result = $stmt->fetchAll( PDO::FETCH_ASSOC );
print_r( $result );

And this is what was displayed:

Using MSSQL...
Query OK. Returned ID is 149

Using PDO...
Array
(
)

I would love to find out that I'd done something stupid, rather than come up against a horrible dead end:)

Answer 1

You've got a few choices:

SELECT @@IDENTITY - return the last ID created by actions of the current connection, regardless of table/scope

SELECT SCOPE_IDENTITY() - last ID produced by the current connection, in scope, regardless of table

SELECT IDENT_CURRENT('name_of_table'); - last ID produced on that table, regardless of table/scope/connection

Of the three, SCOPE_IDENTITY() is the best candidate.

Answer 2

Maybe you are getting two rowsets returned. Try adding SET NOCOUNT ON; to eliminate the INSERT's rowset, or use $stmt->nextRowset if your driver supports it.