实现全文搜索
全文搜索对于每个 SQL Server 实例都可用且在 SMO 中由 FullTextService 对象来表示。FullTextService 对象位于 Server 对象下。它用于管理 Microsoft 全文搜索服务的配置选项。FullTextCatalogCollection 对象属于 Database 对象,并且它是表示为数据库定义的全文目录的 FullTextCatalog 对象的集合。与普通索引不同,只能为每个表定义一个全文索引。此索引由 Table 对象中的 FullTextIndexColumn 对象表示。
若要创建全文搜索服务,必须为数据库定义一个全文目录,并为数据库的其中一个表定义一个全文搜索索引。
首先,通过调用 FullTextCatalog 构造函数并指定目录名称,为数据库创建全文目录。其次,通过调用该构造函数并指定要为其创建全文索引的表,创建全文索引。接着,通过使用 FullTextIndexColumn 对象并提供表中列的名称,可以为全文索引添加索引列。然后,为已创建的目录设置 CatalogName 属性。最后,调用 Create 方法并为 SQL Server 实例创建全文索引。
示例
若要使用所提供的任何代码示例,您必须选择创建应用程序所需的编程环境、编程模板和编程语言。有关详细信息,请参阅如何在 Visual Studio .NET 中创建 Visual Basic SMO 项目或如何在 Visual Studio .NET 中创建 Visual C# SMO 项目。
在 Visual Basic 中创建全文搜索服务
此代码示例将为 AdventureWorks 示例数据库中的 ProductCategory 表创建全文搜索目录。然后,它会为 ProductCategory 表中的 Name 列创建全文搜索索引。全文搜索索引要求已为该列定义唯一索引。
'Connect to the local, default instance of SQL Server.
Dim srv As Server
srv = New Server
'Reference the AdventureWorks database.
Dim db As Database
db = srv.Databases("AdventureWorks")
'Reference the ProductCategory table.
Dim tb As Table
tb = db.Tables("ProductCategory", "Production")
'Define a FullTextCatalog object variable by specifying the parent database and name arguments in the constructor.
Dim ftc As FullTextCatalog
ftc = New FullTextCatalog(db, "Test_Catalog")
ftc.IsDefault = True
'Create the Full Text Search catalog on the instance of SQL Server.
ftc.Create()
'Define a FullTextIndex object varaible by supplying the parent table argument in the constructor.
Dim fti As FullTextIndex
fti = New FullTextIndex(tb)
'Define a FullTextIndexColumn object variable by supplying the parent index and column name arguements in the constructor.
Dim ftic As FullTextIndexColumn
ftic = New FullTextIndexColumn(fti, "Name")
'Add the indexed column to the index.
fti.IndexedColumns.Add(ftic)
fti.ChangeTracking = ChangeTracking.Automatic
'Specify the unique index on the table that is required by the Full Text Search index.
fti.UniqueIndexName = "AK_ProductCategory_Name"
'Specify the catalog associated with the index.
fti.CatalogName = "Test_Catalog"
'Create the Full Text Search index on the instance of SQL Server.
fti.Create()
在 Visual C# 中创建全文搜索服务
此代码示例将为 AdventureWorks 示例数据库中的 ProductCategory 表创建全文搜索目录。然后,它会为 ProductCategory 表中的 Name 列创建全文搜索索引。全文搜索索引要求已为该列定义唯一索引。
{
//Connect to the local, default instance of SQL Server.
Server srv = default(Server);
srv = new Server();
//Reference the AdventureWorks database.
Database db = default(Database);
db = srv.Databases("AdventureWorks");
//Reference the ProductCategory table.
Table tb = default(Table);
tb = db.Tables("ProductCategory", "Production");
//Define a FullTextCatalog object variable by specifying
//the parent database and name arguments in the constructor.
FullTextCatalog ftc = default(FullTextCatalog);
ftc = new FullTextCatalog(db, "Test_Catalog");
ftc.IsDefault = true;
//Create the Full-Text Search catalog on the instance of SQL Server.
ftc.Create();
//Define a FullTextIndex object varaible by supplying the
//parent table argument in the constructor.
FullTextIndex fti = default(FullTextIndex);
fti = new FullTextIndex(tb);
//Define a FullTextIndexColumn object variable by supplying
//the parent index and column name arguements in the constructor.
FullTextIndexColumn ftic = default(FullTextIndexColumn);
ftic = new FullTextIndexColumn(fti, "Name");
//Add the indexed column to the index.
fti.IndexedColumns.Add(ftic);
fti.ChangeTracking = ChangeTracking.Automatic;
//Specify the unique index on the table that is required by
//the Full Text Search index.
fti.UniqueIndexName = "AK_ProductCategory_Name";
//Specify the catalog associated with the index.
fti.CatalogName = "Test_Catalog";
//Create the Full Text Search index on the instance of SQL Server.
fti.Create();
}