If i have insert query for example:
INSERT INTO user(username) VALUES('admin');
And then get the id of the inserted record with
LAST_INSERT_ID();
Looks find but what happens if between the insert and LAST_INSERT_ID() another insert is executed.
How MySQL knows to return the correct id (for the first or second insert) since no parameter is passed to LAST_INSERT_ID();
Is it save to use this function?
Thanks
I'm supposing that you mean what happen if i'm connected to the MySQL server and executing an INSERT but others are also doing insert, like updating a table on a website while client are currently using it.
If you go take a look at the documentation https://dev.mysql.com/doc/refman/8.0/en/information-functions.html there is a point that answers your questions:
The ID that was generated is maintained in the server on a
per-connection basis. This means that the value returned by the
function to a given client is the first AUTO_INCREMENT value generated
for most recent statement affecting an AUTO_INCREMENT column by that
client. This value cannot be affected by other clients, even if they
generate AUTO_INCREMENT values of their own. This behavior ensures
that each client can retrieve its own ID without concern for the
activity of other clients, and without the need for locks or
transactions.
This should be the same in MariaDB.
As discussed in the comment, you are wondering if you can use this in a php PDO environment. If you mean to use this directly from the database, it's a no, you won't be able to have the last inserted ID because you won't have the same client connection as PDO. If you want to use it directly from PDO please use the specific PDO function: http://php.net/manual/fr/pdo.lastinsertid.php , this should allow to do what you want.
If you insert multiple rows into a table using a single INSERT query, the LAST_INSERT_ID function returns the last insert id of the first row.
i.e
If your table id has 3 as column value and you will insert 4 rows in a single query then LAST_INSERT_ID will give you 4 instead of 7
If you insert 4 rows in 4 different insert query then LAST_INSERT_ID will give you 7
last_insert_id( ) Or mysqli_insert_id( ) will always return the id of last or most recent query. And also be noted that id field must have AUTO_INCREMENT enabled.
It doesn't give you the freedom to choose any specific table. Or you can't have id which is generated from your previous query.
So, from this point it serves a very small purpose. Only the last id, it doesn't matter which table.
To get last id from any specific table this query would be helpful : "SELECT id FROM table_name ORDER BY id DESC LIMIT 1"
Related
I want to insert multiple rows into a table, using a single INSERT statement. This is no problem, since SQL offers the option to provide multiple rows as parameter for a single INSERT statement. Now, those rows contain an ID field that is incremented automatically, i.e. its value is set by the database, not by my code.
As a result, I would like to get the ID values of the inserted rows. My basic question is: How do I do that for MariaDB / MySQL?
As it turns out, this is pretty simple, e.g. in PostgreSQL, as PostgreSQL has the RETURNING clause for INSERT which returns the desired values for one or even for multiple rows. This is exactly what I want and it works.
Unfortunately, neither MariaDB nor MySQL have PostgreSQL's RETURNING clause, so I need to fallback to something such as LAST_INSERT_ID(), but this only returns the ID of the single last inserted row, even if multiple rows were inserted using a single INSERT. How do I get all the ID values?
My code currently looks like this:
INSERT INTO mytable
(foo, bar)
VALUES
('fooA', 'barA'),
('fooB', 'barB');
SELECT LAST_INSERT_ID() AS id;
How can I solve this issue in a way that works even with concurrent writes?
(And no, it's not an option to change to a UUID field, or something like this; the auto-increment field is given, and can not be changed.)
MySQL & MariaDB have the LAST_INSERT_ID() function, and it returns the id generated by the most recent INSERT statement in your current session.
But when your INSERT statement inserts multiple rows, LAST_INSERT_ID() returns the first id in the set generated.
In such a batch of multiple rows, you can rely on the subsequent id's being consecutive. The MySQL JDBC driver depends on this, for example.
If the rows you insert include a mix of NULL and non-NULL values for the id column, you have a risk of messing up this assumption. The JDBC driver returns the wrong values for the set of generated id's.
As stated in the comments, you can capture the inserted IDs (SQL Server):
use tempdb
create table test (
id int identity(1,1) primary key,
t varchar(10) null
)
create table ids (
i int not null
)
insert test(t)
output inserted.id into ids
values (null), (null), (null)
select *
from test
select *
from ids
Lets asume a table like:
ID = INT, AutoIncrement
VAR = VARCHAR, 65
FOO = VARCHAR, 65
I want to insert something new, and get the Auto-Generated ID, for further use.
My current solution is:
1.INSERT into table (VAR,FOO) VALUES ('test','anothertest')
2.SELECT * FROM table ORDER BY ID LIMIT 1
To get the last insert, but the problem is, what happends if the website lags, and there is a time gap between the queries?
example:
12:00AM 0.000s -> "INSERT into table (VAR,FOO) VALUES ('test','anothertest')
12:00AM 0.500s -> "INSERT into table (VAR,FOO) VALUES ('xyz', '!!!!!)`
12:00AM 0.800s -> "SELECT * FROM table ORDER BY ID LIMIT 1
the Query in 3 would not return the ID from 1, it would return the ID from 2
My Question no is, is there an absolute secure way to get a Value from a inserted Query?
like a confirmation "test, anothertest has successfully inserted into table, ID is 20"
the ID should be available as variable in php, just for information
Since you mention PHP there is usually a specific function to get that. If you are using the mysqli drivers then see mysqli_insert_id
Edit: According to the docs linked above The value of the AUTO_INCREMENT field that was updated by the previous query. Returns zero if there was no previous query on the connection or if the query did not update an AUTO_INCREMENT value. Since it is talking about queries on the connection then I would interpret that as meaning that queries on other connection (i.e. queries from other requests) won't affect the value returned. As long as you call it dirctly after the insert (before you do anythign else) then it should work.
Caveat: I am simply interpreting the docs here. I haven't actually tested for other calls myself. Wouldn't be that difficult though - simply have a script which does an insert, a sleep then fetches the ID, giving you time to do another insert during the sleep.
In php I use mysql_insert_id();
In later MySql insert/update I use LAST_INSERT_ID()
It's absolutely the same.
Try using, Scope_Identity(). This returns the last autogenerated id.
This link has more info: http://msdn.microsoft.com/en-us/library/ms190315.aspx
Just wanted to runt this by someone who knows more MySQL than myself
I perform a MySQL insert where I insert say 10 rows in one query. Then when you get MySQL's last insert id, it gives you the ID of the first inserted ID.
Is it safe to assume that the other IDs are consecutively the insert_id - insert_id+9? or is there any possible way this could not turn out to be the case?
Thanks
Yes, there is a possibility this will not always be the case.
With innodb_autoinc_lock_mode = 2, the rows inserted by a single INSERT statement can be assigned AUTO_INCREMENT values that are not consecutive (when concurrent INSERT statements are running.)
http://dev.mysql.com/doc/refman/5.1/en/innodb-auto-increment-handling.html
After inserting new data into a table, I need to select some of the new data straight after, so I can use it for inserting into another table.
The only way I can think of doing this is using the 'datetime' field I have in my row, but how would I retrieve the latest date/time inserted.
INSERT statement with NOW() value for datetime
society_select = SELECT socID, creator, datetime FROM societies.society WHERE datetime='[..datetime is the newest...]';
Hope that makes sense. Thank you
There are a number of ways to do this.
Why not make use of a trigger for this?
When a trigger creates a record you can get the id's of the records inserted. You can then do a select and insert new values into the relevant table.
MYSQL has loads of resources on using triggers.
http://dev.mysql.com/doc/refman/5.0/en/triggers.html
Or you can get the number of rows affected then use this to get the required result set in a select statement.
Get the last inserted ID?
If you are inserting one row into the database at a time then you would be able to get the last inserted id from MYSQL. This will be the Primary Key value of the record you last inserted into the database.
You would basically do something like this in mysql:
SET #inserted_id = LAST_INSERT_ID();
Or in PHP you can use the function:
mysql_insert_id(&mysql);
http://dev.mysql.com/doc/refman/5.0/en/getting-unique-id.html
Sort the results by their datetime in descending order, and select the first of them.
society_select = SELECT socID, creator, datetime FROM societies.society ORDER BY datetime DESC LIMIT 1;
you can use this with an auto increment filed. after inserting data you can retrieve the list inserted id from the table. and use that id to get the latest record.
A trigger as suggested is an option. If you don't want to use that for some kind of reason you can:
Add an integer primary key with auto_increment as ID and sort it DESC (e.g. INT(11))
Sort descending on a timestamp column (ofcourse with an index on it)
Use a trigger after inserting the data. This is for sure the cleaner way.
Another option is to use a method like mysql_insert_id. Assumed that you use PHP. There are of course equivalent methods in other languages as well.
Sorting is not an option(if not wrapped smart in transaction) - If you have multiple writes and reads on the table this might end up pretty ugly.
I'd like to insert two associated records into two tables. One record is associated with another record by a foreign key.
e.g. I have two records:
product (productid,product_name,category_id)
category (category_id,category_name)
But the category_id is auto_increment. So I don't know its value until I insert it into the category table. So here I have to invoke three sql queries, one is to insert record into category table, second is retrieval the category_id, the last sql query is to insert record into product table.
Overall, it seems the performance will not be good because of executing three sql queries. I just want to know is there any best practice for this scenario ? Thanks
Jeff Zhang
Check here how you can get the last inserted unique id
When a new AUTO_INCREMENT value has
been generated, you can also obtain it
by executing a SELECT LAST_INSERT_ID()
statement with mysql_query() and
retrieving the value from the result
set returned by the statement.
Also note that
For LAST_INSERT_ID(), the most
recently generated ID is maintained in
the server on a per-connection basis
You don't have to invoke SQL to see the inserted autoincrement value, you can use last_insert_id function.