In my mysql table i have an id-column which is set to autoincrement.
then i do queries like this:
INSERT INTO table (id, foo) VALUES ('', 'bar')
how can i then safely find out which id was generated with this insert?
if i just query the last id this might not be safe, since another insert could have happened in the meantime, right?
There's a PHP and also a MySQL function for this: mysqli_insert_id() and PDO::lastInsertId().
http://php.net/manual/en/function.mysql-insert-id.php
Use LAST_INSERT_ID() in SQL
SELECT LAST_INSERT_ID();
Use mysql_insert_id() in PHP
If you are using PHP to get the auto_incremented value that is returned after an INSERT statement, try using the MySQLi insert_id function. The older mysql_insert_id() version is being deprecated in PHP.
An example below:
<?php
$mysqli = new mysqli("localhost", "my_user", "my_password", "world");
/* check connection */
if (mysqli_connect_errno()) {
printf("Connect failed: %s\n", mysqli_connect_error());
exit();
}
$mysqli->query("CREATE TABLE myCity LIKE City");
$query = "INSERT INTO myCity VALUES (NULL, 'Stuttgart', 'DEU', 'Stuttgart', 617000)";
$mysqli->query($query);
printf ("New Record has id %d.\n", $mysqli->insert_id);
/* drop table */
$mysqli->query("DROP TABLE myCity");
/* close connection */
$mysqli->close();
?>
http://php.net/manual/en/function.mysql-insert-id.php
If you use mysql_query("..."), then mysql_insert_id() is the function you need. If you use something else to do queries, then the corresponding documentation should be checked
Be Careful when using mysql_insert_id() specially if you have multiple connections to the Database. Because It doesn't get the value of the query you've inserted. it gets the latest id of the table. It may be a row another query has inserted. Only use this function if you access Database in one connection.
https://www.php.net/manual/en/function.mysql-insert-id.php
Since it's PHP, mysql_insert_id should do the trick
Take a look at the rather good example at http://php.net/manual/en/function.mysql-insert-id.php
mysqli_insert_id();
You can also simply run this query:
INSERT INTO table (foo) VALUES ('bar')
Simple method
Insert data :
$sql = "INSERT INTO table (id, foo) VALUES ('', 'bar')";
$conn->query($sql)
Get ID :
return $conn->insert_id;
also in PDO after the execute command as the example below:
$lastId = $dbh->lastInsertId();
click for REF
Related
I'm sorry about my PHP skills, but I'm just not figuring out how to do this simple task which is INSERT a new row and save its ID into a variable.
Here's what I got:
// mysql inserting a new row
$sql = "INSERT INTO `order` (orderTitle, orderDescription, orderPrice,userID, categoryID)
VALUES('$title', '$description','$price','$userID','$category');";
$sql .= "SELECT LAST_INSERT_ID();";
$result = mysqli_multi_query($con,$sql);
$result_get_id= mysqli_next_result($con);
$row = mysqli_fetch_row($result_get_id);
$order_id = $row[0]; // <-- how to get this value??
I realized row[0] doesn't work, which is why I would like to know how to extract the LAST_INSERT_ID() value correctly.
A couple of things here...
Don't use mysqli_multi_query - it's unnecessary in your example. Use mysqli_query on the INSERT only. No need to query last insert id in SQL.
To get the last insert id, call mysqli_insert_id directly after your INSERT query. You can assign this to a variable, such as $order_id = mysqli_insert_id();
The database class you're using has built in functions for this e.g. mysqli_insert_id(), or for PDO $db->lastInsertId().
$mysqli->query("INSERT INTO order ... ");
printf ("Primary key of new record: %d.\n", $mysqli->insert_id);
http://php.net/manual/en/mysqli.insert-id.php
How can I get the id that was just inserted for the current user if it is controlled by AUTO_INCREMENT?
(I need the Id for another use)
Note: some row can be deleted so MAX(id) is not an option.
Ex:
inserted row 2
inserted row 3
deleted row 3
inserted row 4 but MAX(id) returns 3..
Thank you very much!
With PDO:
$db->lastInsertId(); // $db is the PDO object
With MySQLi OOP:
$db->insert_id; // $db is the MySQLi object
With MySQLi procedural:
mysqli_insert_id($db); // $db is the connection variable
If you're using the old MySQL API, switch.
try
select ##identity
This should return the last value in the identity column
Since your answer is tagged with PHP, I'll answer in that context. If you're using the PDO API, you can use PDO::lastInsertId. If you're using the mysql function API, the equivalent would be mysqli_insert_id or mysql_insert_id.
Edit: Ninja'd :P
Use mysql_insert_id() or mysqli_insert_id()
you can use mysql_insert_id
<?php
$link = mysql_connect('localhost', 'mysql_user', 'mysql_password');
if (!$link) {
die('Could not connect: ' . mysql_error());
}
mysql_select_db('mydb');
mysql_query("INSERT INTO mytable (product) values ('kossu')");
printf("Last inserted record has id %d\n", mysql_insert_id());
?>
EDIT:
mysql_insert_id is deprecated. now its mysqli_insert_id
EDIT:
Im trying to submit a form with a title and body but i want the title to go to one table and body to go to another table, this in itself i can do but i need the ID generated from the title being inserted into its table to then be inserted into a field in the table the body is inserted so as to keep them linked.
What i have so far: I know its not pretty and its not safe, i will be reworking them once i learn how to do it properly.
if (#$_POST['post'])
{
$body = #$_POST['body'];
$title = #$_POST['title'];
$BoardID = #$_POST['BoardID'];
$MemberID = #$_POST['MemberID'];
$date = date("Y-m-d H:i:s");
include ('connect.php');
$insert = mysql_query("INSERT INTO threads VALUES ('','$BoardID','$title','$date','$MemberID','','')");
if($insert) {
header("location: ?p=posts&thread=$Thread_ID");
exit();
}
}
I need to somehow get $Thread_ID which has been generated in the insert and add that to a second insert for adding body to the post table, if that makes sense.
I tried getting the latest $Thread_ID and adding +1 but if multiple threads are posted at once they might get crossed over.
How would i go about fixing this?
The PHP manual tell us:
This extension Mysql is deprecated as of PHP 5.5.0, and is not recommended for writing new code as it will be removed in the future. Instead, either the mysqli or PDO_MySQL extension should be used.
(see ref.)
You must use mysqli or PDO, to make a connection between PHP and a MySQL database.
mysqli
If you want the id of the inserted row, you can use $mysqli->insert_id (ref)
Example:
$query = "INSERT INTO myCity VALUES (NULL, 'Stuttgart', 'DEU', 'Stuttgart', 617000)";
$mysqli->query($query);
printf ("New Record has id %d.\n", $mysqli->insert_id);
PDO
If you want the id of the inserted row, you can use $dbh->lastInsertId(); (ref)
And don't forget to sanatize all your inputs.
You need to execute both insert queries separately.
$insert = "INSERT INTO threads VALUES ('','$BoardID','$title','$date','$MemberID','','')";
$result = #mysql_query($insert);
$Thread_ID=#mysql_insert_id();
$insert = "INSERT INTO posts VALUES ('','$BoardID',$Thread_ID','$body','$date','$MemberID')";
$result = #mysql_query($insert);
Thanks,
I am using mysqli class at one of my project, i want yours help with following...
How to insert custom insert query
like we do in mysql
INSERT INTO payment_slip VALUES(NULL, md5(code), 'ABC', 'tester', NOW());
How to get last insert id using this class.
Providing methods would be great help, thanks.
Just like the plain old mysql functions mysqli has a field for this too:
mysqli->insert_id
From php docs (note that this only demonstrates getting the ID, the parameters are hardcoded into the query):
$mysqli = new mysqli("localhost", "my_user", "my_password", "world");
if (mysqli_connect_errno()) {
printf("Connect failed: %s\n", mysqli_connect_error());
exit();
}
$query = "INSERT INTO payment_slip VALUES(NULL, md5(code), 'ABC', 'tester', NOW())";
$mysqli->query($query);
printf ("New Record has id %d.\n", $mysqli->insert_id);
Running mysqli_insert_id() will also work, but you should use it like vbence said.
The 'id' field of my table auto increases when I insert a row. I want to insert a row and then get that ID.
I would do it just as I said it, but is there a way I can do it without worrying about the time between inserting the row and getting the id?
I know I can query the database for the row that matches the information that was entered, but there is a high change there will be duplicates, with the only difference being the id.
$link = mysqli_connect('127.0.0.1', 'my_user', 'my_pass', 'my_db');
mysqli_query($link, "INSERT INTO mytable (1, 2, 3, 'blah')");
$id = mysqli_insert_id($link);
See mysqli_insert_id().
Whatever you do, don't insert and then do a "SELECT MAX(id) FROM mytable". Like you say, it's a race condition and there's no need. mysqli_insert_id() already has this functionality.
Another way would be to run both queries in one go, and using MySQL's LAST_INSERT_ID() method, where both tables get modified at once (and PHP does not need any ID), like:
mysqli_query($link, "INSERT INTO my_user_table ...;
INSERT INTO my_other_table (`user_id`) VALUES (LAST_INSERT_ID())");
Note that Each connection keeps track of ID separately (so, conflicts are prevented already).
The MySQL function LAST_INSERT_ID() does just what you need: it retrieves the id that was inserted during this session. So it is safe to use, even if there are other processes (other people calling the exact same script, for example) inserting values into the same table.
The PHP function mysql_insert_id() does the same as calling SELECT LAST_INSERT_ID() with mysql_query().
As to PHP's website, mysql_insert_id is now deprecated and we must use either PDO or MySQLi (See #Luke's answer for MySQLi). To do this with PDO, proceed as following:
$db = new PDO('mysql:dbname=database;host=localhost', 'user', 'pass');
$statement = $db->prepare('INSERT INTO people(name, city) VALUES(:name, :city)');
$statement->execute([':name' => 'Bob', ':city' => 'Montreal']);
echo $db->lastInsertId();
As #NaturalBornCamper said, mysql_insert_id is now deprecated and should not be used. The options are now to use either PDO or mysqli. NaturalBornCamper explained PDO in his answer, so I'll show how to do it with MySQLi (MySQL Improved) using mysqli_insert_id.
// First, connect to your database with the usual info...
$db = new mysqli($hostname, $username, $password, $databaseName);
// Let's assume we have a table called 'people' which has a column
// called 'people_id' which is the PK and is auto-incremented...
$db->query("INSERT INTO people (people_name) VALUES ('Mr. X')");
// We've now entered in a new row, which has automatically been
// given a new people_id. We can get it simply with:
$lastInsertedPeopleId = $db->insert_id;
// OR
$lastInsertedPeopleId = mysqli_insert_id($db);
Check out the PHP documentation for more examples: http://php.net/manual/en/mysqli.insert-id.php
I just want to add a small detail concerning lastInsertId();
When entering more than one row at the time, it does not return the last Id, but the first Id of the collection of last inserts.
Consider the following example
$sql = 'INSERT INTO my_table (varNumb,userid) VALUES
(1, :userid),
(2, :userid)';
$sql->addNewNames = $db->prepare($sql);
addNewNames->execute(array(':userid' => $userid));
echo $db->lastInsertId();
What happens here is that I push in my_table two new rows. The id of the table is auto-increment. Here, for the same user, I add two rows with a different varNumb.
The echoed value at the end will be equal to the id of the row where varNumb=1, which means not the id of the last row, but the id of the first row that was added in the last request.
An example.
$query_new = "INSERT INTO students(courseid, coursename) VALUES ('', ?)";
$query_new = $databaseConnection->prepare($query_new);
$query_new->bind_param('s', $_POST['coursename']);
$query_new->execute();
$course_id = $query_new->insert_id;
$query_new->close();
The code line $course_id = $query_new->insert_id; will display the ID of the last inserted row.
Hope this helps.
Try like this you can get the answer:
<?php
$con=mysqli_connect("localhost","root","","new");
// Check connection
if (mysqli_connect_errno())
{
echo "Failed to connect to MySQL: " . mysqli_connect_error();
}
mysqli_query($con,"INSERT INTO new values('nameuser','2015-09-12')");
// Print auto-generated id
echo "New record has id: " . mysqli_insert_id($con);
mysqli_close($con);
?>
Have a look at following links:
http://www.w3schools.com/php/func_mysqli_insert_id.asp
http://php.net/manual/en/function.mysql-insert-id.php
Also please have a note that this extension was deprecated in PHP 5.5 and removed in PHP 7.0
I found an answer in the above link http://php.net/manual/en/function.mysql-insert-id.php
The answer is:
mysql_query("INSERT INTO tablename (columnname) values ('$value')");
echo $Id=mysql_insert_id();
Try this... it worked for me!
$sql = "INSERT INTO tablename (row_name) VALUES('$row_value')";
if (mysqli_query($conn, $sql)) {
$last_id = mysqli_insert_id($conn);
$msg1 = "New record created successfully. Last inserted ID is: " . $last_id;
} else {
$msg_error = "Error: " . $sql . "<br>" . mysqli_error($conn);
}
Another possible answer will be:
When you define the table, with the columns and data it'll have. The column id can have the property AUTO_INCREMENT.
By this method, you don't have to worry about the id, it'll be made automatically.
For example (taken from w3schools )
CREATE TABLE Persons
(
ID int NOT NULL AUTO_INCREMENT,
LastName varchar(255) NOT NULL,
FirstName varchar(255),
Address varchar(255),
City varchar(255),
PRIMARY KEY (ID)
)
Hope this will be helpful for someone.
Edit: This is only the part where you define how to generate an automatic ID, to obtain it after created, the previous answers before are right.