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I have a table which has got a column with AUTO INCREMENT. I have to retrieve the value of this column when inserting a new row (i need the value of the new row). I've read a lot about it and found different solutions, one is to use SELECT LAST_INSERT_ID(). I've heard many different things about this. Can I or can i not use this? I am worried that another connection may insert a new row before I am able to call SELECT LAST_INSERT_ID(), and therefore get the wrong ID.
To sum up, is it safe to use SELECT LAST_INSERT_ID()? If not, how can I retrieve the last inserted id in a safe way?
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If you insert a record into a table that contains an AUTO_INCREMENT column, you can obtain the value stored into that column by calling the mysql_insert_id() function.
If you are AUTO_INCREMENT with column, then you can use last_insert_id() method. This method gets the ID of the last inserted record in MySQL.
With no argument, LAST_INSERT_ID() returns a 64-bit value representing the first automatically generated value successfully inserted for an AUTO_INCREMENT column as a result of the most recently executed INSERT statement.
To obtain the value immediately after an INSERT , use a SELECT query with the LAST_INSERT_ID() function. For example, using Connector/ODBC you would execute two separate statements, the INSERT statement and the SELECT query to obtain the auto-increment value.
I dont think that you need to worry about the case you are mentioning here.
From Mysql documentation:
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.
For detailed info, refer this
Although, i would love to read from others if they have different opinion.
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