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The PrimaryKey attribute indicates the field that is a part of a primary key.

PrimaryKey.cs

using System;

using NUnit.Framework;

using BLToolkit.DataAccess; using BLToolkit.Mapping;

namespace HowTo.DataAccess { [TestFixture] public class PrimaryKey { public class Person { [MapField("PersonID"), PrimaryKey, NonUpdatable] public int ID;

public string LastName; public string FirstName; public string MiddleName; }

[Test] public void Test() { SqlQuery<Person> da = new SqlQuery<Person>();

Person person = da.SelectByKey(1);

Assert.IsNotNull(person); } } }

DataAccessor.SelectByKeySql method generates and executes the following SQL statement:

SELECT
    [MiddleName],
    [PersonID],
    [LastName],
    [FirstName]
FROM
    [Person]
WHERE
    [PersonID] = @PersonID

MultiplePrimaryKey.cs

using System;

using NUnit.Framework;

using BLToolkit.DataAccess; using BLToolkit.Mapping;

namespace HowTo.DataAccess { [TestFixture] public class MultiplePrimaryKey { [TableName("Person")] public class Person { [MapField("PersonID"), NonUpdatable] public int ID;

// These fields are not real primary key of the table. // They are made primary key for demonstration purpose only. // [PrimaryKey(1)] public string FirstName; [PrimaryKey(2)] public string LastName;

public string MiddleName; }

[Test] public void Test() { SqlQuery<Person> query = new SqlQuery<Person>();

Person person = query.SelectByKey("Tester", "Testerson");

Assert.IsNotNull(person); } } }

In this case DataAccessor.SelectByKeySql method generates and executes the following SQL statement:

SELECT
    [MiddleName],
    [PersonID],
    [LastName],
    [FirstName]
FROM
    [Person]
WHERE
    [FirstName] = @FirstName AND
    [LastName] = @LastName

App.config

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
    <connectionStrings>
        <add
            name             = "DemoConnection"
            connectionString = "Server=.;Database=BLToolkitData;Integrated Security=SSPI"
            providerName     = "System.Data.SqlClient" />
    </connectionStrings>
</configuration>

CreateSql
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