How Can I Efficiently Handle Null Values When Reading SQL Data into POCO Objects?

Gracefully handle null column values ​​in SQL data reader

When using the SQL Data Reader to create Plain Old CLR Objects (POCO) from a database, it is crucial to handle null column values ​​skillfully to avoid exceptions and ensure data integrity.

One way to manage null values ​​is to check IsDBNull:

<code class="language-csharp">if (!sqlReader.IsDBNull(indexFirstName))
{
  employee.FirstName = sqlReader.GetString(indexFirstName);
}</code>

This method allows you to explicitly test for null values ​​and perform specific logic accordingly.

To simplify the process, consider creating extension methods that wrap these checks and return default values ​​for empty columns:

<code class="language-csharp">public static string SafeGetString(this SqlDataReader reader, int colIndex)
{
   if(!reader.IsDBNull(colIndex))
       return reader.GetString(colIndex);
   return string.Empty;
}</code>

Using this extension method, your code becomes more concise and readable:

<code class="language-csharp">employee.FirstName = sqlReader.SafeGetString(indexFirstName);</code>

This method ensures that null values ​​are handled consistently without manual checking or risk of exceptions.

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