Insert statement with primary key and scope identity - php

Question

I want to get the the primary key (auto_increment) for the latest record to use it as a foreign key in the other table. When I use the SCOPE_IDENTITY() as a pdo parameter, I get the error:
Call to undefined function SCOPE_IDENTITY().
When I use it as a direct value, the statement always rolls back.
Is my code correct?
if (empty($errors)) {
$sqlconnection = new SqlConnection();
$conn = $sqlconnection->db_connect();
if ($conn) {
if (sqlsrv_begin_transaction($conn) === false ) {
$errors[] = "Cant start transaction.";
} else {
// Query1
$query1 = "INSERT INTO [RC.table1] (terminname, datum) VALUES (?, ?)";
$params1 = array($eventname, $eventdate);
$stmt1 = sqlsrv_query($conn, $query1, $params1);
//Query2
$query2 = "INSERT INTO [RC.table2] (appointment_id, mandant_id) VALUES ((SELECT SCOPE_IDENTITY()), ?)";
$params2 = array($_SESSION['mandant_id']);
$stmt2 = sqlsrv_query($conn, $query2, $params2);
if($stmt1 && $stmt2) {
sqlsrv_commit( $conn );
echo "Transaction committed.<br />";
} else {
sqlsrv_rollback( $conn );
echo "Transaction rolled back.<br />";
}
}
} else {
$errors[] = "Cant connect to database.";
}
}

Answer 1

Try this solution: replace
$query2 = "INSERT INTO [RC.table2] (appointment_id, mandant_id) VALUES ((SELECT SCOPE_IDENTITY()), ?)";
with this:
$query2 = "DECLARE #LastID INT; SET #LastID = SCOPE_IDENTITY(); INSERT INTO [RC.table2] (appointment_id, mandant_id) VALUES (#LastID, ?)";
Also, for #LastID variable definition (DECLARE #LastID INT) please use the same data type as data type of appointment_id column. In this example, I assumed that #LastID's type is INT.
Edit: You could create the following stored procedure with TRY ... CATCH:
CREATE PROCEDURE dbo.Insert_Table1Table2
(
#terminname NVARCHAR(50),
#datum DATE,
#mandant_id INT
)
AS
BEGIN
BEGIN TRANSACTION;
BEGIN TRY
INSERT INTO [RC.table1] (terminname, datum) VALUES (#terminname, #datum)
DECLARE #appointment_id INT;
SET #appointment_id = SCOPE_IDENTITY();
INSERT INTO [RC.table2] (appointment_id, mandant_id) VALUES (#appointment_id, #mandant_id)
END TRY
BEGIN CATCH
SELECT
DECLARE #ErrorMessage NVARCHAR(2048);
SET #ErrorMessage = ERROR_MESSAGE();
RAISERROR(#ErrorMessage, 16, 1)
IF ##TRANCOUNT > 0
ROLLBACK TRANSACTION;
END CATCH;
IF ##TRANCOUNT > 0
COMMIT TRANSACTION;
END
Note: You should replace every type and max. length with the proper type and length.

Answer 2

BEGIN TRAN T1;
INSERT INTO [RC.table1] (terminname, datum) VALUES ('alibaba', '24.02.2014');
BEGIN TRAN T22
INSERT INTO [RC.table2] (appointment_id, mandant_id) VALUES ((SELECT SCOPE_IDENTITY()), '0200')
COMMIT TRAN T1;
COMMIT TRAN T2;
that works perfectly in the studio. dont know, why I cant get the identity in the php transaction.

Answer 3

By the way, while that code MIGHT work, I would suggest the following changes...
$query1 = "INSERT INTO [RC.table1] (terminname, datum) VALUES (?, ?);select ##identy"
now, retrieve the result (which will be the new key added) and pass it as a parameter to the next SQL call.