SqlException: Cannot insert explicit value for identity column

When you have a table with an identity column, and you try to specify the value for identity column when inserting a record, you’ll get the following exception: Microsoft.Data.SqlClient.SqlException (0x80131904): Cannot insert explicit value for identity column in table ‘Movies’ when IDENTITY_INSERT is set to OFF. This error means you have an identity column in … Read more

SQL Server – Getting and storing date/time

In this article, I’ll show built-in functions in SQL Server for getting the current datetime and how to get individual parts of the datetime (such as the year). Then show I’ll show how to store datetimes using the four different date/time data types (date, time, datetime2, and datetimeoffset). Getting the current datetime SQL Server has … Read more

C# – How to use SqlBulkCopy to do a Bulk Insert

If you find yourself doing SQL Inserts in a loop, you may want to consider doing a Bulk Insert instead. You can use SqlBulkCopy to do a Bulk Insert from C#. Make sure to prove you have a performance problem before switching your code to use Bulk Insert. Like any optimization, it adds complexity. In … Read more

C# – Mapping nullable columns with SqlDataReader

When you have a database table with null columns, and you’re using SqlDataReader to map the results, there are a few things to do: Use nullable types in the model class. Example: instead of int use int? so the value can be null. Use SqlDataReader.IsDBNull() to check if you need to set the value to … Read more

SQL Server – Foreach Table

To execute a query against all tables in a database, you can use the sp_msForeachTable stored proc, like this: Note: The ? is a placeholder for the table name. In this article I’ll show two examples of using sp_msForeachTable. Example – Get record counts for all tables This query saves record counts to a temp … Read more