Inserting data with Dapper with DateTime2 throws SqlDateTime overflow exception

.net ado.net c# dapper sql

Question

If I have an object such as:

public class Person
{
  public int Id {get;set;}
  public string Name {get;set;}
  public DateTime DOB {get;set;}
}

If I set the name on my object and DOB is DateTime.MinValue and use Dapper like so:

INSERT INTO [Person] ([Person].[Name], [Person].[DOB]) VALUES (@Name, @DOB);
SELECT CAST(SCOPE_IDENTITY()  AS BIGINT) AS [Id]

connection.Query<long>(sql, entity);

This throws SqlDateTime overflow. Must be between 1/1/1753 12:00:00 AM and 12/31/9999 11:59:59 PM.

However if I execute the SQL in SQL Management Studio with a string version '0001-01-01 00:00:00' it inserts into the db fine.

Any ideas how to get this to work?

Thanks

UPDATE:

CREATE TABLE [dbo].[Person](
    [Id] [int] IDENTITY(1,1) NOT NULL,
    [DOB] [datetime2](7) NULL,
    [Name] [nvarchar](20) NOT NULL,
 CONSTRAINT [PK_Referrer_Referee] PRIMARY KEY CLUSTERED 
(
    [Id] ASC
)WITH (PAD_INDEX  = OFF, STATISTICS_NORECOMPUTE  = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS  = ON, ALLOW_PAGE_LOCKS  = ON) ON [PRIMARY]
) ON [PRIMARY]
GO

Accepted Answer

.Net DateTime should handle both.

Dapper is mapping datetime to DbType DateTime and not DbType.DateTime2 which is what you need.

https://github.com/SamSaffron/dapper-dot-net/blob/master/Dapper%20NET40/SqlMapper.cs#L384

typeMap[typeof(DateTime)] = DbType.DateTime; typeMap[typeof(DateTime?)] = DbType.DateTime;

But you can add a TypeMap yourself but then you need to create a datetime2 type/class.


Popular Answer

Try looking at this SO answer, about mapping the DateTime2 type in Dapper



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