SQL Data Reader - handling Null column values

Question

I\'m using a SQLdatareader to build POCOs from a database. The code works except when it encounters a null value in the database. For example, if the FirstName column in the

Answer 1

You may use the conditional operator:

employee.FirstName = sqlreader["indexFirstName"] != DBNull.Value ? sqlreader[indexFirstName].ToString() : "";

Answer 2

You should use the as operator combined with the ?? operator for default values. Value types will need to be read as nullable and given a default.

employee.FirstName = sqlreader[indexFirstName] as string;
employee.Age = sqlreader[indexAge] as int? ?? default(int);

The as operator handles the casting including the check for DBNull.

Answer 3

I am using the code listed below to handle null cells in an Excel sheet that is read in to a datatable.

if (!reader.IsDBNull(2))
{
   row["Oracle"] = (string)reader[2];
}

Answer 4

you can ever check for this as well

if(null !=x && x.HasRows)
{ ....}

Answer 5

I don't think there's a NULL column value, when rows are returned within a datareader using the column name.

If you do datareader["columnName"].ToString(); it will always give you a value that can be a empty string (String.Empty if you need to compare).

I would use the following and wouldn't worry too much:

employee.FirstName = sqlreader["columnNameForFirstName"].ToString();

Answer 6

I think you would want to use:

SqlReader.IsDBNull(indexFirstName)