SQL: How to get the id of values I just INSERTed?

76

I inserted some values into a table. There is a column whose value is auto-generated. In the next statement of my code, I want to retrieve this value.

Can you tell me how to do it the right way?

This question is tagged with sql-server

~ Asked on 2008-09-05 12:27:58

21 Answers


57

@@IDENTITY is not scope safe and will get you back the id from another table if you have an insert trigger on the original table, always use SCOPE_IDENTITY()

~ Answered on 2008-09-05 12:31:48


29

This is how I do my store procedures for MSSQL with an autogenerated ID.

CREATE PROCEDURE [dbo].[InsertProducts]
    @id             INT             = NULL OUT,
    @name           VARCHAR(150)    = NULL,
    @desc           VARCHAR(250)    = NULL

AS

    INSERT INTO dbo.Products
       (Name,
        Description)
    VALUES
       (@name,
        @desc)

    SET @id = SCOPE_IDENTITY();

~ Answered on 2008-09-05 12:31:43


14

This works very nicely in SQL 2005:

DECLARE @inserted_ids TABLE ([id] INT);

INSERT INTO [dbo].[some_table] ([col1],[col2],[col3],[col4],[col5],[col6])
OUTPUT INSERTED.[id] INTO @inserted_ids
VALUES (@col1,@col2,@col3,@col4,@col5,@col6)

It has the benefit of returning all the IDs if your INSERT statement inserts multiple rows.

~ Answered on 2008-11-23 20:25:55


14

If your using PHP and MySQL you can use the mysql_insert_id() function which will tell you the ID of item you Just instered.
But without your Language and DBMS I'm just shooting in the dark here.

~ Answered on 2008-09-05 12:31:47


11

Again no language agnostic response, but in Java it goes like this:

Connection conn = Database.getCurrent().getConnection();  
PreparedStatement ps =  conn.prepareStatement(insertSql, Statement.RETURN_GENERATED_KEYS);
try {  
    ps.executeUpdate();  
    ResultSet rs = ps.getGeneratedKeys();  
    rs.next();  
    long primaryKey = rs.getLong(1);  
} finally {  
    ps.close();  
}  

~ Answered on 2008-09-05 13:05:01


8

If you are working with Oracle:

Inset into Table (Fields....) values (Values...) RETURNING (List of Fields...) INTO (variables...)

example:

INSERT INTO PERSON (NAME) VALUES ('JACK') RETURNING ID_PERSON INTO vIdPerson

or if you are calling from... Java with a CallableStatement (sry, it's my field)

INSERT INTO PERSON (NAME) VALUES ('JACK') RETURNING ID_PERSON INTO ?

and declaring an autput parameter for the statement

~ Answered on 2008-09-05 13:05:29


6

There's no standard way to do it (just as there is no standard way to create auto-incrementing IDs). Here are two ways to do it in PostgreSQL. Assume this is your table:

CREATE TABLE mytable (
  id SERIAL PRIMARY KEY,
  lastname VARCHAR NOT NULL,
  firstname VARCHAR
);

You can do it in two statements as long as they're consecutive statements in the same connection (this will be safe in PHP with connection pooling because PHP doesn't give the connection back to the pool until your script is done):

INSERT INTO mytable (lastname, firstname) VALUES ('Washington', 'George');
SELECT lastval();

lastval() gives you the last auto-generated sequence value used in the current connection.

The other way is to use PostgreSQL's RETURNING clause on the INSERT statement:

INSERT INTO mytable (lastname) VALUES ('Cher') RETURNING id;

This form returns a result set just like a SELECT statement, and is also handy for returning any kind of calculated default value.

~ Answered on 2008-09-05 13:16:30


4

From the site i found out the following things:

SQL SERVER – @@IDENTITY vs SCOPE_IDENTITY() vs IDENT_CURRENT – Retrieve Last Inserted Identity of Record March 25, 2007 by pinaldave

SELECT @@IDENTITY It returns the last IDENTITY value produced on a connection, regardless of the table that produced the value, and regardless of the scope of the statement that produced the value. @@IDENTITY will return the last identity value entered into a table in your current session. While @@IDENTITY is limited to the current session, it is not limited to the current scope. If you have a trigger on a table that causes an identity to be created in another table, you will get the identity that was created last, even if it was the trigger that created it.

SELECT SCOPE_IDENTITY() It returns the last IDENTITY value produced on a connection and by a statement in the same scope, regardless of the table that produced the value. SCOPE_IDENTITY(), like @@IDENTITY, will return the last identity value created in the current session, but it will also limit it to your current scope as well. In other words, it will return the last identity value that you explicitly created, rather than any identity that was created by a trigger or a user defined function.

SELECT IDENT_CURRENT(‘tablename’) It returns the last IDENTITY value produced in a table, regardless of the connection that created the value, and regardless of the scope of the statement that produced the value. IDENT_CURRENT is not limited by scope and session; it is limited to a specified table. IDENT_CURRENT returns the identity value generated for a specific table in any session and any scope.

~ Answered on 2010-10-01 06:58:31


4

An important note is that using vendor SQL queries to retrieve the last inserted ID are safe to use without fearing about concurrent connections.

I always thought that you had to create a transaction in order to INSERT a line and then SELECT the last inserted ID in order to avoid retrieving an ID inserted by another client.

But these vendor specific queries always retrieve the last inserted ID for the current connection to the database. It means that the last inserted ID cannot be affected by other client insertions as long as they use their own database connection.

~ Answered on 2008-09-05 13:11:02


4

For SQL 2005:

Assuming the following table definition:

CREATE TABLE [dbo].[Test](
    [ID] [int] IDENTITY(1,1) NOT NULL,
    [somevalue] [nchar](10) NULL,
) 

You can use the following:

INSERT INTO Test(somevalue)
OUTPUT INSERTED.ID
VALUES('asdfasdf')

Which will return the value of the ID column.

~ Answered on 2008-09-05 13:30:56


2

Ms SQL Server: this is good solution even if you inserting more rows:

 Declare @tblInsertedId table (Id int not null)

 INSERT INTO Test ([Title], [Text])
 OUTPUT inserted.Id INTO @tblInsertedId (Id)
 SELECT [Title], [Text] FROM AnotherTable

 select Id from @tblInsertedId 

~ Answered on 2012-08-17 06:39:44


2

sql = "INSERT INTO MyTable (Name) VALUES (@Name);" +
      "SELECT CAST(scope_identity() AS int)";
SqlCommand cmd = new SqlCommand(sql, conn);
int newId = (int)cmd.ExecuteScalar();

~ Answered on 2010-07-01 15:35:01


2

This is how I've done it using parameterized commands.

MSSQL

 INSERT INTO MyTable (Field1, Field2) VALUES (@Value1, @Value2); 
 SELECT SCOPE_IDENTITY(); 

MySQL

 INSERT INTO MyTable (Field1, Field2) VALUES (?Value1, ?Value2);
 SELECT LAST_INSERT_ID();

~ Answered on 2008-09-05 14:40:50


2

Remember that @@IDENTITY returns the most recently created identity for your current connection, not necessarily the identity for the recently added row in a table. You should always use SCOPE_IDENTITY() to return the identity of the recently added row.

~ Answered on 2008-09-05 12:29:42


2

What database are you using? As far as I'm aware, there is no database agnostic method for doing this.

~ Answered on 2008-09-05 12:29:56


1

Rob's answer would be the most vendor-agnostic, but if you're using MySQL the safer and correct choise would be the built-in LAST_INSERT_ID() function.

~ Answered on 2008-09-05 12:37:56


0

Simplest answer:

command.ExecuteScalar()

by default returns the first column

Return Value Type: System.Object The first column of the first row in the result set, or a null reference (Nothing in Visual Basic) if the result set is empty. Returns a maximum of 2033 characters.

Copied from MSDN

~ Answered on 2014-06-09 18:56:58


0

  1. insert the row with a known guid.
  2. fetch the autoId-field with this guid.

This should work with any kind of database.

~ Answered on 2008-09-15 22:12:05


0

An Environment Based Oracle Solution:

CREATE OR REPLACE PACKAGE LAST
AS
ID NUMBER;
FUNCTION IDENT RETURN NUMBER;
END;
/

CREATE OR REPLACE PACKAGE BODY LAST
AS
FUNCTION IDENT RETURN NUMBER IS
    BEGIN
    RETURN ID;
    END;
END;
/


CREATE TABLE Test (
       TestID            INTEGER ,
    Field1      int,
    Field2      int
)


CREATE SEQUENCE Test_seq
/
CREATE OR REPLACE TRIGGER Test_itrig
BEFORE INSERT ON Test
FOR EACH ROW
DECLARE
seq_val number;
BEGIN
IF :new.TestID IS NULL THEN
    SELECT Test_seq.nextval INTO seq_val FROM DUAL;
    :new.TestID := seq_val;
    Last.ID := seq_val;
END IF;
END;
/

To get next identity value:
SELECT LAST.IDENT FROM DUAL

~ Answered on 2008-11-23 20:22:42


0

In TransactSQL, you can use OUTPUT clause to achieve that.

INSERT INTO my_table(col1,col2,col3) OUTPUT INSERTED.id VALUES('col1Value','col2Value','col3Value')

FRI: http://msdn.microsoft.com/en-us/library/ms177564.aspx

~ Answered on 2013-05-08 06:40:45


0

SELECT @@Scope_Identity as Id

There is also @@identity, but if you have a trigger, it will return the results of something that happened during the trigger, where scope_identity respects your scope.

~ Answered on 2008-09-05 12:29:23


Most Viewed Questions: