<% group # Abstract accessor attributes %>

<p class='j'>
If a method returns a scalar value, this attribute can be used to specify how database returns this value.
The <b>ScalarSource</b> attribute take a parameter of the <b>ScalarSourceType</b> type:

<table class='data'>
<tr><th>ScalarSourceType</th><th>Description</th></tr>
<tr><td>DataReader</td><td>Calls the <b>DbManager.ExecuteReader</b> method, and then calls <b>IDataReader.GetValue</b> method to read the value.</td></tr>
<tr><td>OutputParameter</td><td>Calls the <b>DbManager.ExecuteNonQuery</b> method, and then reads value from the <b>IDbDataParameter.Value</b> property.</td></tr>
<tr><td>ReturnValue</td><td>Calls the <b>DbManager.ExecuteNonQuery</b> method, and then reads return value from command parameter collection.</td></tr>
<tr><td>AffectedRows</td><td>Calls the <b>DbManager.ExecuteNonQuery</b> method, and then returns its return value.</td></tr>
</table>
</p>

ScalarSource.cs
<% ..\..\..\HowTo\DataAccess\ScalarSource.cs %>
App.config
<% Doc\Data\App.config %>
<a href="../Data/CreateSql.htm">Create.sql script</a>