Mssql Insert Return Generated Keys

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The Microsoft JDBC Driver for SQL Server supports the optional JDBC 3.0 APIs to retrieve automatically generated row identifiers. The main value of this feature is to provide a way to make IDENTITY values available to an application that is updating a database table without a requiring a query and a second round-trip to the server.

Mar 31, 2013 Here Mudassar Ahmed Khan has explained with an example and attached sample code, how to return the value of Identity (Auto Increment) Column value after record is inserted in SQL Server database using ADO.Net with C# and VB.Net. Apr 20, 2006  How to Generate Sequences and Surrogate Keys in Generic SQL. Which I’m aware offers a feature to make surrogate keys easier by automatically generating the next larger value upon insert. In SQL Server, it’s. Such as the need to find out the value that was generated by the last insertion, but those are usually not hard. If this function existed, then the stored procedure could return the newly created record ID, and work correctly with the RETURNGENERATEDKEYS call. 22 Nov 2005 15:22 Mark Matthews No, it is not possible, as the JDBC driver has no 'insight' into what functions exist, and functions can only return result sets or output parameters. If multiple values are inserted with Statement.RETURNGENERATEDKEYS set, driver returns only the last generated key/identity value on calling getGeneratedKeys. The ResultSet object returned by getGeneratedKeys will contain a row for each value that a statement generated. I would expect it to return a result set with a column called MyID; this is what our old Coldfusion 8 32bit server did with our MSSQL 2005 databases. Since we have upgraded to Coldfusion 9 64bit and MSSQL 2008 R2, it no longer does this. Instead, it returns a query with the column called GENERATEDKEYS. If you specify an ON DUPLICATE KEY UPDATE clause and a row to be inserted would cause a duplicate value in a UNIQUE index or PRIMARY KEY, an UPDATE of the old row occurs. For example, if column a is declared as UNIQUE and contains the value 1, the following two statements have similar effect:. INSERT INTO t1 (a,b,c) VALUES (1,2,3) ON DUPLICATE KEY UPDATE c=c+1; UPDATE t1 SET c=c+1 WHERE a=1. Mar 31, 2013  Here Mudassar Ahmed Khan has explained with an example and attached sample code, how to return the value of Identity (Auto Increment) Column value after record is inserted in SQL Server database using ADO.Net with C# and VB.Net.

Because SQL Server doesn't support pseudo columns for identifiers, updates that have to use the auto-generated key feature must operate against a table that contains an IDENTITY column. SQL Server allows only a single IDENTITY column per table. The result set that is returned by getGeneratedKeys method of the SQLServerStatement class will have only one column, with the returned column name of GENERATED_KEYS. If generated keys are requested on a table that has no IDENTITY column, the JDBC driver will return a null result set.

As an example, create the following table in the sample database:

In the following example, an open connection to the sample database is passed in to the function, an SQL statement is constructed that will add data to the table, and then the statement is run and the IDENTITY column value is displayed.

See also

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Returns the last identity value inserted into an identity column in the same scope. A scope is a module: a stored procedure, trigger, function, or batch. Therefore, if two statements are in the same stored procedure, function, or batch, they are in the same scope.

Syntax

Return Types

numeric(38,0)

Remarks

SCOPE_IDENTITY, IDENT_CURRENT, and @@IDENTITY are similar functions because they return values that are inserted into identity columns.

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IDENT_CURRENT is not limited by scope and session; it is limited to a specified table. IDENT_CURRENT returns the value generated for a specific table in any session and any scope. For more information, see IDENT_CURRENT (Transact-SQL).

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SCOPE_IDENTITY and @@IDENTITY return the last identity values that are generated in any table in the current session. However, SCOPE_IDENTITY returns values inserted only within the current scope; @@IDENTITY is not limited to a specific scope.

For example, there are two tables, T1 and T2, and an INSERT trigger is defined on T1. When a row is inserted to T1, the trigger fires and inserts a row in T2. This scenario illustrates two scopes: the insert on T1, and the insert on T2 by the trigger.

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Assuming that both T1 and T2 have identity columns, @@IDENTITY and SCOPE_IDENTITY return different values at the end of an INSERT statement on T1. @@IDENTITY returns the last identity column value inserted across any scope in the current session. This is the value inserted in T2. SCOPE_IDENTITY() returns the IDENTITY value inserted in T1. This was the last insert that occurred in the same scope. The SCOPE_IDENTITY() function returns the null value if the function is invoked before any INSERT statements into an identity column occur in the scope.

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Failed statements and transactions can change the current identity for a table and create gaps in the identity column values. The identity value is never rolled back even though the transaction that tried to insert the value into the table is not committed. For example, if an INSERT statement fails because of an IGNORE_DUP_KEY violation, the current identity value for the table is still incremented.

Examples

A. Using @@IDENTITY and SCOPE_IDENTITY with triggers

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The following example creates two tables, TZ and TY, and an INSERT trigger on TZ. When a row is inserted to table TZ, the trigger (Ztrig) fires and inserts a row in TY.

Result set: This is how table TZ looks.

Result set: This is how TY looks:

/what-are-the-two-main-ways-to-generate-surrogate-keys.html. Create the trigger that inserts a row in table TY when a row is inserted in table TZ.

FIRE the trigger and determine what identity values you obtain with the @@IDENTITY and SCOPE_IDENTITY functions.

Here is the result set.

B. Using @@IDENTITY and SCOPE_IDENTITY() with replication

The following examples show how to use @@IDENTITY and SCOPE_IDENTITY() for inserts in a database that is published for merge replication. Both tables in the examples are in the AdventureWorks2012 sample database: Person.ContactType is not published, and Sales.Customer is published. Merge replication adds triggers to tables that are published. Therefore, @@IDENTITY can return the value from the insert into a replication system table instead of the insert into a user table.

The Person.ContactType table has a maximum identity value of 20. If you insert a row into the table, @@IDENTITY and SCOPE_IDENTITY() return the same value.

Here is the result set.

The Sales.Customer table has a maximum identity value of 29483. If you insert a row into the table, @@IDENTITY and SCOPE_IDENTITY() return different values. SCOPE_IDENTITY() returns the value from the insert into the user table, whereas @@IDENTITY returns the value from the insert into the replication system table. Use SCOPE_IDENTITY() for applications that require access to the inserted identity value.

Here is the result set.

See Also