How to perform an insert and return inserted identity with Dapper?

How to perform an insert and return inserted identity with Dapper?

To perform an insert and return the inserted identity with Dapper, you can use the Execute method along with the SCOPE_IDENTITY() function in the SQL query. Here is an example:

 using (var connection = new SqlConnection(connectionString)) { connection.Open(); var query = "INSERT INTO Customers (Name, Address) VALUES (@Name, @Address);" + "SELECT CAST(SCOPE_IDENTITY() as int)"; int customerId = connection.Query<int>(query, new { Name = "John Doe", Address = "123 Main St" }).Single(); Console.WriteLine($"Inserted customer with ID {customerId}"); }

In this example, we first open a new SqlConnection and define our SQL query to insert a new customer and return the inserted identity value. We use the CAST function to convert the identity value to an integer type.

We then use the Query method of the Dapper SqlConnection object to execute the query and return the inserted identity value. We pass in the query string as the first argument, and an anonymous object with the parameter values as the second argument.

Finally, we use the Single method to get the single integer value returned by the query, which represents the inserted identity value.

Examples

  1. "Dapper insert and return identity example"

    • Code:
      var insertedId = connection.Query<int>("INSERT INTO TableName (Column1, Column2) VALUES (@Value1, @Value2); SELECT SCOPE_IDENTITY();", new { Value1 = "example", Value2 = 42 }).Single();
    • Description: Demonstrates a basic example of inserting data into a table and returning the inserted identity using SCOPE_IDENTITY() with Dapper.

  2. "Dapper insert and return identity with output parameter"

    • Code:
      var parameters = new DynamicParameters(); parameters.Add("@Value1", "example"); parameters.Add("@Value2", 42); parameters.Add("@InsertedId", dbType: DbType.Int32, direction: ParameterDirection.Output); connection.Execute("INSERT INTO TableName (Column1, Column2) VALUES (@Value1, @Value2); SET @InsertedId = SCOPE_IDENTITY();", parameters); var insertedId = parameters.Get<int>("@InsertedId");
    • Description: Illustrates using output parameters to return the inserted identity after performing an insert operation with Dapper.

  3. "Dapper insert and return identity with ExecuteScalar"

    • Code:
      var insertedId = connection.ExecuteScalar<int>("INSERT INTO TableName (Column1, Column2) VALUES (@Value1, @Value2); SELECT SCOPE_IDENTITY();", new { Value1 = "example", Value2 = 42 });
    • Description: Shows using ExecuteScalar with Dapper to perform an insert and return the inserted identity directly.

  4. "Dapper insert and return identity with QueryFirst"

    • Code:
      var insertedId = connection.QueryFirst<int>("INSERT INTO TableName (Column1, Column2) VALUES (@Value1, @Value2); SELECT SCOPE_IDENTITY();", new { Value1 = "example", Value2 = 42 });
    • Description: Demonstrates using QueryFirst with Dapper to execute an insert statement and return the inserted identity.

  5. "Dapper insert and return identity with QueryFirstOrDefault"

    • Code:
      var insertedId = connection.QueryFirstOrDefault<int>("INSERT INTO TableName (Column1, Column2) VALUES (@Value1, @Value2); SELECT SCOPE_IDENTITY();", new { Value1 = "example", Value2 = 42 });
    • Description: Uses QueryFirstOrDefault with Dapper to perform an insert and return the inserted identity, handling the case where no result is returned.

  6. "Dapper insert and return identity with QuerySingle"

    • Code:
      var insertedId = connection.QuerySingle<int>("INSERT INTO TableName (Column1, Column2) VALUES (@Value1, @Value2); SELECT SCOPE_IDENTITY();", new { Value1 = "example", Value2 = 42 });
    • Description: Illustrates using QuerySingle with Dapper for inserting data and returning the inserted identity, expecting a single result.

  7. "Dapper insert and return identity with QuerySingleOrDefault"

    • Code:
      var insertedId = connection.QuerySingleOrDefault<int>("INSERT INTO TableName (Column1, Column2) VALUES (@Value1, @Value2); SELECT SCOPE_IDENTITY();", new { Value1 = "example", Value2 = 42 });
    • Description: Uses QuerySingleOrDefault with Dapper for an insert operation, returning the inserted identity, and handling the case where no or multiple results are returned.

  8. "Dapper insert and return identity with Execute"

    • Code:
      var insertedId = connection.Execute("INSERT INTO TableName (Column1, Column2) VALUES (@Value1, @Value2); SELECT SCOPE_IDENTITY();", new { Value1 = "example", Value2 = 42 });
    • Description: Demonstrates using the Execute method with Dapper to perform an insert and return the inserted identity.

  9. "Dapper insert and return identity with dynamic parameters"

    • Code:
      var parameters = new DynamicParameters(); parameters.Add("@Value1", "example"); parameters.Add("@Value2", 42); var insertedId = connection.Query<int>("INSERT INTO TableName (Column1, Column2) VALUES (@Value1, @Value2); SELECT SCOPE_IDENTITY();", parameters).Single();
    • Description: Illustrates using DynamicParameters with Dapper to execute an insert statement and return the inserted identity.

  10. "Dapper insert and return identity with IDbConnection extension"

    • Code:
      var insertedId = connection.Insert<int>("INSERT INTO TableName (Column1, Column2) VALUES (@Value1, @Value2); SELECT SCOPE_IDENTITY();", new { Value1 = "example", Value2 = 42 });
    • Description: Utilizes a Dapper extension method to simplify the insert and return identity operation by extending IDbConnection with a custom Insert method.

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