PHP PDO prepare transaction statement (Two inserts) - php

Question

I have tried to insert two insert intos through a transaction statement but it did not work. The console is giving me database errors. I have checked the documentation http://wiki.hashphp.org/PDO_Tutorial_for_MySQL_Developers and it is obvious I am missing something.
The goal is simply insert into two different tables different information. I tried the following:
// create record
function create(){
try {
$stmt->beginTransaction();
$query = "INSERT INTO " . $this->table_name . "
SET user_id = ?, ";
// prepare query statement
$stmt = $this->conn->prepare($query);
// bind values to be inserted
$stmt->bindParam(1, $this->user_id);
$stmt->execute();
$query2 = "INSERT INTO legalcases_report
SET user_id = ?, ";
// prepare query statement 2
$stmt = $this->conn->prepare($query2);
$stmt->bindParam(1, $this->user_id);
$stmt->execute();
$stmt->commit();
return true;
} catch (Exception) {
$stmt->rollBack();
return false;
}
}

Answer 1

There are lots of problems in this code, I hope I can catch them all
// create record
function create(){
try {
// transaction work on a connection and not a statement
//$stmt->beginTransaction();
$this->conn->beginTransaction();
// Incorrect syntax for an INSERT command
// Error - Trailing comma in sytax
$query = "INSERT INTO " . $this->table_name . "
SET user_id = ?, ";
// prepare query statement
$stmt = $this->conn->prepare($query);
// bind values to be inserted
$stmt->bindParam(1, $this->user_id);
$stmt->execute();
// Incorrect syntax for an INSERT command
// Error - Trailing comma in sytax
$query2 = "INSERT INTO legalcases_report
SET user_id = ?, ";
// prepare query statement 2
$stmt = $this->conn->prepare($query2);
$stmt->bindParam(1, $this->user_id);
$stmt->execute();
// commit also works on a connection object
//$stmt->commit();
$this->conn->commit();
return true;
// PDO generates a PDOException so you should really catch that,
// it will fallback to the parent Exception object, BUT
// there may be times when you want to catch them seperately
// from the same try block, so use the correct one or both
} catch (PDOException $pex) {
$this->con->rollback();
$pex->getMessage();
exit; // because you have a serious problem
// or throw your own exception to the calling code
throw new Exception('Create user failed ' . $pex->getMessage());
}
}
Incorrect syntax for an INSERT command
The PHP PDO manual

Answer 2

I guess you should use PDO object, not PDOStatement:
try {
$this->conn->beginTransaction();
...
$this->conn->commit();