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c#.netsql-serverasp.net-mvcdapper

How to retrieve a single value from the database using Dapper


I'm using Dapper and trying to retrieve a short from the database and would like to do this without grabbing it from a collection.

I've got the following code, which doesn't work because QueryAsync<short> returns IEnumerable<short>.

short status;
using (var sqlConnection = new SqlConnection(connectionString))
{
    var parameters = new DynamicParameters();
    parameters.Add("@ID", ID, DbType.Int32, ParameterDirection.Input);

    await sqlConnection.OpenAsync();
    status = await sqlConnection.QueryAsync<short>("SELECT [StatusID] FROM [MyTable] WHERE [ID] = @ID", parameters, commandTimeout: _sqlCommandTimeoutInSeconds);
}

Can I get Dapper to return a single value, instead of a collection?


Solution

  • FYI, Dapper has now added both QuerySingle and QuerySingleAsync as well as their corresponding OrDefault variants... usage for QuerySingleOrDefaultAsync is:

    await connection.QuerySingleOrDefaultAsync<short>(sql);