这是一个示例模型：
<cf:pattern path="ClusteredIndexAspect.xml" step="Start" name="ClusteredIndex" />
<cf:entity name="Student">
<cf:property name="Id" cfps:hint="CLUSTERED" key="true" />
<cf:property name="Name" />
<cf:property name="Courses" typeName="{0}.CourseCollection" relationPropertyName="Students" />
</cf:entity>
<cf:entity name="Course">
<cf:property name="Id" cfps:hint="CLUSTERED" key="true" />
<cf:property name="Name" />
<cf:property name="Students" typeName="{0}.StudentCollection" relationPropertyName="Courses" />
</cf:entity>
该ClusteredIndexAspect.xml文件（我只是添加cf:pattern标签）：
<cf:project xmlns:cf="http://www.softfluent.com/codefluent/2005/1" defaultNamespace="ClusteredHint">
<cf:pattern name="ClusteredIndex" namespaceUri="http://www.softfluent.com/samples/clustered-index" preferredPrefix="_ci" step="Start">
<cf:message class="_doc">
Clustered Index Aspect
</cf:message>
</cf:pattern>
<!-- assembly references -->
<?code @reference name="CodeFluent.Producers.SqlServer.dll" ?>
<?code @reference name="CodeFluent.Runtime.Database.dll" ?>
<!-- namespace includes -->
<?code @namespace name="System" ?>
<?code @namespace name="System.Collections.Generic" ?>
<?code @namespace name="CodeFluent.Model.Code" ?>
<?code @namespace name="CodeFluent.Model.Persistence" ?>
<?code @namespace name="CodeFluent.Model.Code" ?>
<!-- add global code to listen to inference steps -->
<?code
Project.StepChanging += (sender1, e1) =>
{
if (e1.Step == ImportStep.End) // hook before production begins (end of inference pipeline)
{
var modifiedTables = ProjectHandler.AddClusteredHint(Project);
// get sql server producer and hook on production events
var sqlProducer = Project.Producers.GetProducerInstance<CodeFluent.Producers.SqlServer.SqlServerProducer>();
sqlProducer.Production += (sender, e) =>
{
// determine what SQL file has been created
// we want to remove hints once the table_diffs has been created, before relations_add is created
string script = e.GetDictionaryValue("filetype", null);
if (script == "TablesDiffsScript")
{
ProjectHandler.RemoveClusteredHint(modifiedTables);
}
};
}
};
?>
<!-- add member code to handle inference modification -->
<?code @member
public class ProjectHandler
{
public static IList<Table> AddClusteredHint(Project project)
{
if(project == null)
throw new ArgumentNullException("project");
var list = new List<Table>();
foreach (var table in project.Database.Tables)
{
// we're only interested by tables inferred from M:M relations
if (table.Relation == null || table.Relation.RelationType != RelationType.ManyToMany)
continue;
// check this table definition is ok for us
if (table.RelationKeyColumns == null || table.RelationRelatedKeyColumns == null || table.RelationKeyColumns.Count < 1 || table.RelationRelatedKeyColumns.Count < 1)
continue;
// check clustered is declared on both sides
string keyHint = GetSqlServerProducerHint(table.RelationKeyColumns[0].Property) ?? "";
string relatedKeyHint = GetSqlServerProducerHint(table.RelationKeyColumns[0].Property) ?? "";
if (keyHint.IndexOf("clustered", StringComparison.OrdinalIgnoreCase) < 0 ||
relatedKeyHint.IndexOf("clustered", StringComparison.OrdinalIgnoreCase) < 0)
{
continue;
}
table.PrimaryKey.Elements[0].SetAttribute("hint", CodeFluent.Producers.SqlServer.Constants.SqlServerProducerNamespaceUri, "clustered");
// remember this table
list.Add(table);
}
return list;
}
public static void RemoveClusteredHint(IEnumerable<Table> list)
{
foreach (var table in list)
{
table.PrimaryKey.Elements[0].RemoveAttribute("hint", CodeFluent.Producers.SqlServer.Constants.SqlServerProducerNamespaceUri);
}
}
// helper method to read XML element's hint attribute in the SQL Server Producer namespace
private static string GetSqlServerProducerHint(Node node)
{
if (node == null)
return null;
return node.GetAttributeValue<string>("hint", CodeFluent.Producers.SqlServer.Constants.SqlServerProducerNamespaceUri, null);
}
}
?>
</cf:project>
生成的表有聚集索引：
CREATE TABLE [dbo].[Course] (
[Course_Id] [uniqueidentifier] NOT NULL,
CONSTRAINT [PK_Cou_Cou_Cou] PRIMARY KEY CLUSTERED (...)
)
CREATE TABLE [dbo].[Student] (
[Student_Id] [uniqueidentifier] NOT NULL,
CONSTRAINT [PK_Stu_Stu_Stu] PRIMARY KEY CLUSTERED (...)
)
CREATE TABLE [dbo].[Course_Students_Student_Courses] (
[Course_Id] [uniqueidentifier] NOT NULL,
[Student_Id] [uniqueidentifier] NOT NULL,
CONSTRAINT [PK_Cor_Cou_Stu_Cor] PRIMARY KEY clustered(...)
)
编辑：要将聚集索引添加到预订实体，您必须设置cfps:clustered="true"
<cf:entity name="Booking" setType="List" trackingModes="None" namespace="Marmara">
<cf:property name="Hotel" cfps:clustered="true" key="true" typeName="Marmara.Hotel" />
<cf:property name="Fly" cfps:clustered="true" key="true" typeName="Marmara.Fly" />
<cf:property name="Price" typeName="int" />
<cf:property name="AvailableSeat" typeName="int" />
<cf:property name="RunTimeDate" cfps:clustered="true" key="true" typeName="Marmara.RunTimeDate" />
</cf:entity>
这将生成以下 SQL 语句：
CREATE CLUSTERED INDEX [CL_dbo_Booking] ON [dbo].[Booking] ( [Booking_Hotel_ProductCode], [Booking_Fly_TakeOffDate], [Booking_RunTimeDate_Date]);