Программы определяемых пользователем типов

Статья
05/07/2013

Образец программ определяемых пользователем типов содержит набор служебных функций. В их число входят функции для предоставления метаданных сборки в Transact-SQL, образцы потоковых функций, возвращающих типы в сборке в виде таблицы, и функции, возвращающие поля, методы и свойства в определяемом пользователем типе данных. При этом, в частности, демонстрируются возвращающие потоковые функции с табличным значением, отражение API-интерфейсов .NET Framework и вызов из Transact-SQL возвращающих табличные значения функций.

Предварительные требования

Для создания и запуска этого проекта должно быть установлено следующее программное обеспечение:

SQL Server или SQL Server Express. SQL Server Express можно получить бесплатно с веб-сайтадокументации и образцов SQL Server Express (возможно, на английском языке)
База данных AdventureWorks2012, доступная на веб-сайте Codeplex.
Пакет SDK 2.0 для платформы .NET Framework или более поздняя версия либо среда Microsoft Visual Studio 2005 или более поздняя версия. Пакет SDK для платформы .NET Framework можно получить бесплатно.
Кроме того, должны выполняться следующие условия.
Для используемого экземпляра SQL Server должна быть включена интеграция со средой CLR.

Чтобы включить интеграцию со средой CLR, выполните следующие действия.

Включение интеграции со средой CLR

Выполните следующие команды Transact-SQL:

sp_configure 'clr enabled', 1;

RECONFIGURE;

Примечание
Чтобы включить CLR, необходимо иметь разрешение ALTER SETTINGS на уровне сервера, которое неявно предоставляется членам предопределенных ролей сервера sysadmin и serveradmin.

На используемом экземпляре SQL Server должна быть установлена база данных AdventureWorks2012.
Если вы не являетесь администратором используемого экземпляра SQL Server, для завершения установки необходимо, чтобы администратор предоставил вам разрешение CreateAssembly .

Построение образца

Создайте и запустите образец в соответствии со следующими инструкциями.

Откройте командную строку Visual Studio или .NET Framework.
Если необходимо, создайте каталог для своего образца. В данном примере будет использоваться каталог C:\MySample.
Поскольку этому примеру требуется подписанная сборка, создайте асимметричный ключ, выполнив следующую команду:

sn -k SampleKey.snk
Скомпилируйте образец кода из командной строки, выполнив одну из следующих команд, в зависимости от выбранного языка.
- Vbc /reference:C:\Windows\Microsoft.NET\Framework\v2.0.50727\System.Data.dll,C:\Windows\Microsoft.NET\Framework\v2.0.50727\System.dll,C:\Windows\Microsoft.NET\Framework\v2.0.50727\System.Xml.dll /keyfile:Key.snk /out:UDTUtilities.dll /target:library AssemblyBrowser.vb
- Csc /reference:C:\Windows\Microsoft.NET\Framework\v2.0.50727\System.Data.dll /reference:C:\Windows\Microsoft.NET\Framework\v2.0.50727\System.dll /reference:C:\Windows\Microsoft.NET\Framework\v2.0.50727\System.XML.dll /keyfile:Key.snk /out:UDTUtilities.dll /target:library AssemblyBrowser.cs
Скопируйте код установки Transact-SQL в файл и сохраните его в файле Install.sql в том же каталоге.
Разверните сборку и хранимую процедуру, выполнив
- sqlcmd -E -I -i install.sql -v root = "C:\MySample\"
Скопируйте скрипт проверки Transact-SQL в файл и сохраните его в файле test.sql в том же каталоге.
Выполните скрипт проверки следующей командой
- sqlcmd -E -I -i test.sql
Скопируйте скрипт очистки Transact-SQL в файл и сохраните его в файле cleanup.sql в том же каталоге.
Выполните скрипт следующей командой
- sqlcmd -E -I -i cleanup.sql

Образец кода

Ниже приведены листинги кода для данного образца.

using System;
using System.Collections;
using System.Data;
using System.Data.Sql;
using System.Data.SqlTypes;
using System.Reflection;
using Microsoft.SqlServer.Server;
using System.Globalization;
using System.Text;
using System.Data.SqlClient;
    /// <summary>
    /// AssemblyBrowser is a simple utility for composing sql queries over 
    /// assembly metadata. It uses a table-valued-function to return
    /// a table to SqlServer.
    /// </summary>
    public sealed class AssemblyBrowser
    {
        /// <summary>
        /// Get the types in the assembly, as a table
        /// </summary>
        /// <param name="name"></param>
        /// <returns></returns>
        [SqlFunction(FillRowMethodName = "FillTypeRow")]
        public static IEnumerable GetTypes(String name)
        {
            IEnumerable e;

            try
            {
                Assembly a = Assembly.Load(name);
                if (a == null)
                    e = new Type[0];
                else
                    e = a.GetTypes();
            }

            catch (ReflectionTypeLoadException te)
            {
                //could not load some of the types, just return the types that you could load
                e = te.Types;
            }

            if (e == null) e = new Type[0];
            return e;

        }

        /// <summary>
        /// Get the schema of the table
        /// </summary>
        /// <returns></returns>


      
        public static void FillTypeRow(object metaData, out string fullName, out string baseTypeName,
            out bool isValueType, out int numFields, out bool isSerializable,
            out bool isISerializable, out bool isLayoutSequential, out string namespaceValue,
            out bool isPublic, out bool isSealed, out string assemblyName)
        {
            Type type = (Type)metaData;
            fullName = type.FullName;
            baseTypeName = (type.BaseType == null) ? "" : type.BaseType.FullName;
            isValueType = type.IsValueType;
            FieldInfo[] fields = type.GetFields(BindingFlags.Instance | BindingFlags.Public);
            numFields = (fields == null) ? 0 : fields.Length;
            isSerializable = type.IsSerializable;
            isISerializable = typeof(System.Runtime.Serialization.ISerializable).IsAssignableFrom(type);
            isLayoutSequential = type.IsLayoutSequential;
            namespaceValue = type.Namespace;
            isPublic = type.IsPublic;
            isSealed = type.IsSealed;
            Assembly a = type.Assembly;
            assemblyName = (a == null) ? "null" : a.GetName().Name;
        }

     
        internal static Assembly GetAssembly(string name)
        {
            try
            {
                return Assembly.Load(name);
            }
            catch (System.IO.FileNotFoundException)
            {
                return null;
            }
        }

        private AssemblyBrowser() { }
        [SqlFunction(FillRowMethodName = "FillAssemblyRow")]
        public static IEnumerable GetLoadedAssemblies()
        {
            IEnumerable e = AppDomain.CurrentDomain.GetAssemblies();
            //Microsoft.SqlServer.Server.SqlMetaData[] schemas
            //    = new Microsoft.SqlServer.Server.SqlMetaData[] {
            //    new Microsoft.SqlServer.Server.SqlMetaData("FullName", SqlDbType.NVarChar, 256)
            //};

            return e;
        }

        
        private static void FillAssemblyRow(object source, out string fullName)
        {
            fullName = ((Assembly)source).FullName;
        }
    }

    [Microsoft.SqlServer.Server.SqlUserDefinedTypeAttribute(Microsoft.SqlServer.Server.Format.Native)]
    [Serializable]
    public struct SimpleUdt : INullable
    {
        #region udt contract
        public override string ToString()
        {
            return base.ToString();
        }


        public bool IsNull
        {
            get
            {
                return this._value.IsNull;
            }
        }


        public static SimpleUdt Null
        {
            get
            {
                SimpleUdt h = new SimpleUdt();

                return h;
            }
        }


        public static SimpleUdt Parse(SqlString sqlString)
        {
            if (sqlString.IsNull)
                return Null;

            SimpleUdt u = new SimpleUdt();

            u.Value = new SqlInt32(int.Parse(sqlString.Value,
                CultureInfo.InvariantCulture));

            return u;
        }
        #endregion

        #region implementation
        private SqlInt32 _value;

        private SqlInt32 _examplePublicField;

        public SqlInt32 ExamplePublicField
        {
            get
            {
                return this._examplePublicField;
            }
            set
            {
                this._examplePublicField = value;
            }
        }


        public SqlInt32 Value
        {
            get
            {
                return this._value;
            }
            set
            {
                this._value = value;
            }
        }

        [Microsoft.SqlServer.Server.SqlMethod(IsDeterministic = true)]
        public SqlInt32 ReturnValue()
        {
            return this._value;
        }

        #endregion
    }
    /// <summary>
    /// Utility Udt functions
    /// </summary>
    public sealed class UdtServices
    {

        #region udt fields
        /// <summary>
        /// Get the fields in the UDT callable from tsql, as a table
        /// </summary>
        /// <param name="udtName"></param>
        /// <returns></returns>
        [SqlFunctionAttribute(FillRowMethodName = "FillFieldRow")]
        public static IEnumerable GetUdtFields(string udtName)
        {
            return GetSqlFields(GetUdt(udtName));
        }

      
        public static void FillFieldRow(object fieldMetadata, out string name, out string type)
        {
            FieldInfo fieldInformation = (FieldInfo)fieldMetadata;
            name = fieldInformation.Name;
            type = fieldInformation.FieldType.Name;
        }

        #endregion

        #region udt properties
        /// <summary>
        /// Get the properties defined in a particular UDT
        /// </summary>
        /// <param name="udtName"></param>
        /// <returns></returns>
        [SqlFunctionAttribute(FillRowMethodName = "FillPropertyRow")]
        public static IEnumerable GetUdtProperties(string udtName)
        {
            return GetSqlProperties(GetUdt(udtName));
        }

      
        public static void FillPropertyRow(object propertyMetadata, out string name, out string type, out string routineProperties)
        {
            PropertyInfo propertyInformation = (PropertyInfo)propertyMetadata;
            name = propertyInformation.Name;
            type = propertyInformation.PropertyType.Name;
            MethodInfo methodInformation = propertyInformation.GetGetMethod();
            object[] attrs = methodInformation.GetCustomAttributes(
                typeof(Microsoft.SqlServer.Server.SqlMethodAttribute), true);

            if (attrs != null && attrs.Length == 1)
            {
                Microsoft.SqlServer.Server.SqlMethodAttribute attr
                    = (Microsoft.SqlServer.Server.SqlMethodAttribute)attrs[0];

                routineProperties = GetRoutineProperties(attr);
            }
            else
                routineProperties = "";
        }

        #endregion

        #region udt methods
        /// <summary>
        /// Get the methods on the UDT callable from tsql, as a table
        /// </summary>
        /// <param name="udtName"></param>
        /// <returns></returns>
        [SqlFunctionAttribute(FillRowMethodName = "FillMethodRow")]
        public static IEnumerable GetUdtMethods(string udtName)
        {
            return GetSqlMethods(GetUdt(udtName));
        }

 
        public static void FillMethodRow(object methodMetadata, out string name,
            out string parameters, out string returnType, out string routineProperties)
        {
            MethodInfo methodInformation = (MethodInfo)methodMetadata;
            name = methodInformation.Name;
            StringBuilder sb = new StringBuilder("(");
            bool first = true;

            foreach (ParameterInfo pi in methodInformation.GetParameters())
            {
                if (first)
                    first = false;
                else
                    sb.Append(", ");

                sb.Append(pi.Name).Append(" ").Append(pi.ParameterType.Name);
            }

            sb.Append(")");

            parameters = sb.ToString();
            returnType = methodInformation.ReturnType.Name;

            object[] attrs = methodInformation.GetCustomAttributes(
                typeof(Microsoft.SqlServer.Server.SqlMethodAttribute), true);

            if (attrs != null && attrs.Length == 1)
            {
                Microsoft.SqlServer.Server.SqlMethodAttribute attr
                    = (Microsoft.SqlServer.Server.SqlMethodAttribute)attrs[0];

                routineProperties = GetRoutineProperties(attr);
            }
            else
                routineProperties = "";


        }

        #endregion

        #region internal utility functions

        private UdtServices()
        {
        }

        /// <summary>
        /// Utility function to get the string representation of
        /// routine properties on a type
        /// </summary>
        /// <param name="attr"></param>
        /// <returns></returns>
        private static string GetRoutineProperties(Microsoft.SqlServer.Server.SqlMethodAttribute attr)
        {
            StringBuilder sb = new StringBuilder();
            if (attr.OnNullCall)
                sb.Append("on_null_call ");

            if (attr.IsMutator)
                sb.Append("mutator ");

            if (attr.IsDeterministic)
                sb.Append("deterministic ");

            if (attr.IsPrecise)
                sb.Append("precise ");

            if (attr.DataAccess != Microsoft.SqlServer.Server.DataAccessKind.None)
                sb.Append("data_access " + Enum.GetName(
                    typeof(Microsoft.SqlServer.Server.DataAccessKind), attr.DataAccess));

            return sb.ToString();
        }

        /// <summary>
        /// Is this a valid parameter type that can be accessible from tsql
        /// </summary>
        /// <param name="t"></param>
        /// <returns></returns>
        private static bool IsSqlParameterType(Type t)
        {
            if (validParameterTypes.ContainsKey(t))
                return true;

            if (t.FullName.StartsWith("System.Data.SqlTypes"))
                return true;

            if (t.GetCustomAttributes(
                typeof(Microsoft.SqlServer.Server.SqlUserDefinedTypeAttribute),
                true).Length == 1)
                return true;

            return false;
        }

        /// <summary>
        /// Is the field type valid?
        /// </summary>
        /// <param name="f"></param>
        /// <param name="declaringType"></param>
        /// <returns></returns>
        private static bool IsSqlField(FieldInfo f, Type declaringType)
        {
            if (f.DeclaringType != declaringType)
                return false;

            return IsSqlParameterType(f.FieldType);
        }

        /// <summary>
        /// Is the property valid to be called from tsql?
        /// </summary>
        /// <param name="f"></param>
        /// <param name="declaringType"></param>
        /// <returns></returns>
        private static bool IsSqlProperty(PropertyInfo f, Type declaringType)
        {
            if (f.DeclaringType != declaringType)
                return false;

            return IsSqlParameterType(f.PropertyType);
        }

        /// <summary>
        /// Is the method valid to be called from tsql?
        /// </summary>
        /// <param name="m"></param>
        /// <param name="declaringType"></param>
        /// <returns></returns>
        private static bool IsSqlMethod(MethodInfo m, Type declaringType)
        {
            if (m.DeclaringType != declaringType)
                return false;

            foreach (ParameterInfo info in m.GetParameters())
            {
                if (!IsSqlParameterType(info.ParameterType))
                    return false;
            }

            return IsSqlParameterType(m.ReturnType);
        }

        /// <summary>
        /// Get the udt specified by the clr type name.
        /// </summary>
        /// <param name="udtName"></param>
        /// <returns></returns>
        private static Type GetUdt(string udtName)
        {
            return Type.GetType(udtName, true);
        }

        /// <summary>
        /// Get the methods on a type
        /// </summary>
        /// <param name="t"></param>
        /// <returns></returns>
        private static ICollection GetSqlMethods(Type t)
        {
            MethodInfo[] methods = t.GetMethods(BindingFlags.Instance | BindingFlags.Public | BindingFlags.DeclaredOnly);
            ArrayList temp = new ArrayList();

            foreach (MethodInfo info in methods)
            {
                if (IsSqlMethod(info, t))
                    temp.Add(info);
            }

            return temp;
        }

        /// <summary>
        /// get the properties on a type
        /// </summary>
        /// <param name="t"></param>
        /// <returns></returns>
        private static ICollection GetSqlProperties(Type t)
        {
            PropertyInfo[] props = t.GetProperties(BindingFlags.Instance | BindingFlags.Public | BindingFlags.DeclaredOnly);
            ArrayList temp = new ArrayList();

            foreach (PropertyInfo info in props)
            {
                if (IsSqlProperty(info, t))
                    temp.Add(info);
            }

            return temp;
        }

        /// <summary>
        /// get the fields on a type
        /// </summary>
        /// <param name="t"></param>
        /// <returns></returns>
        private static ICollection GetSqlFields(Type t)
        {
            FieldInfo[] fields = t.GetFields(BindingFlags.Instance | BindingFlags.Public | BindingFlags.DeclaredOnly);
            ArrayList temp = new ArrayList();

            foreach (FieldInfo info in fields)
            {
                if (IsSqlField(info, t))
                    temp.Add(info);
            }

            return temp;
        }

        /// <summary>
        /// readonly static used to cache frequently used information
        /// </summary>
        private static readonly Hashtable validParameterTypes = GetValidParameterTypes();

        /// <summary>
        /// initialize the cached mapping of valid parameter types
        /// </summary>
        private static Hashtable GetValidParameterTypes()
        {
            Hashtable validTypes = new Hashtable();
            validTypes[typeof(bool)] = true;
            validTypes[typeof(byte)] = true;
            validTypes[typeof(short)] = true;
            validTypes[typeof(char)] = true;
            validTypes[typeof(int)] = true;
            validTypes[typeof(float)] = true;
            validTypes[typeof(long)] = true;
            validTypes[typeof(double)] = true;
            validTypes[typeof(string)] = true;
            validTypes[typeof(Guid)] = true;

            return validTypes;
        }
        #endregion

        #region public utility functions
        [Microsoft.SqlServer.Server.SqlFunction(DataAccess = Microsoft.SqlServer.Server.DataAccessKind.Read)]
        public static string GetFullAssemblyName(string sqlName)
        {
            using (System.Data.SqlClient.SqlConnection conn = new SqlConnection("context connection=true"))
            {
                SqlCommand cmd = conn.CreateCommand();
                cmd.CommandText = @"SELECT @sqlName, "
                + @"assemblyproperty(@sqlName, 'VersionMajor'), "
                + @"assemblyproperty(@sqlName, 'VersionMinor'), "
                + @"assemblyproperty(@sqlName, 'VersionBuild'), "
                + @"assemblyproperty(@sqlName, 'VersionRevision'), "
                + @"assemblyproperty(@sqlName, 'CultureInfo'), "
                + @"assemblyproperty(@sqlName, 'PublicKey'), "
                + @"assemblyproperty(@sqlName, 'Architecture');";

                cmd.Parameters.AddWithValue("@sqlName", sqlName);

                conn.Open();

                SqlDataReader rdr = cmd.ExecuteReader();

                try
                {
                    if (!rdr.Read())
                        throw new ArgumentException(string.Format(
                            CultureInfo.InvariantCulture,
                            "Assembly {0} not found.", sqlName));

                    return GetAssemblyName(rdr.GetString(0), rdr.GetInt32(1),
                        rdr.GetInt32(2), rdr.GetInt32(3),
                        rdr.GetInt32(4), (rdr.IsDBNull(5)
                        ? SqlString.Null : rdr.GetSqlString(5)),
                        (rdr.IsDBNull(6) ? SqlBinary.Null : rdr.GetSqlBinary(6)),
                        rdr.IsDBNull(7) ? SqlString.Null : rdr.GetSqlString(7));
                }
                finally
                {
                    rdr.Close();
                }
            }
        }

        /// <summary>
        /// helper function to return the assembly name from 
        /// its components stored in sql metadata
        /// </summary>
        /// <param name="friendlyName"></param>
        /// <param name="major_version"></param>
        /// <param name="minor_version"></param>
        /// <param name="build"></param>
        /// <param name="revision"></param>
        /// <param name="culture"></param>
        /// <param name="publicKeyToken"></param>
        /// <returns></returns>
        private static string GetAssemblyName(string friendlyName, int majorVersion, int minorVersion,
            int build, int revision, SqlString culture, SqlBinary publicKeyToken, SqlString processorArchitecture)
        {
            StringBuilder sb = new StringBuilder();
            sb.Append(friendlyName).Append(", ");
            sb.Append("version=");
            sb.Append(majorVersion).Append('.');
            sb.Append(minorVersion).Append('.');
            sb.Append(build).Append('.');
            sb.Append(revision).Append(", ");
            sb.Append("culture=").Append(culture.IsNull ? "neutral" : culture.Value).Append(", ");
            sb.Append("publickeytoken=");
            if (publicKeyToken.IsNull)
            {
                sb.Append("null");
            }
            else
            {
                foreach (byte b in publicKeyToken.Value)
                {
                    sb.Append(b.ToString("X2", CultureInfo.InvariantCulture));
                }
            }

            sb.Append(", ");
            sb.Append("processorarchitecture=");
            sb.Append(processorArchitecture.IsNull ? "msil" : processorArchitecture.Value);

            return sb.ToString();
        }

     
        private static string ToHexString(byte[] value)
        {
            if (value == null)
                return null;

            StringBuilder sb = new StringBuilder();
            foreach (byte b in value)
            {
                sb.Append(b.ToString("X2", CultureInfo.InvariantCulture));
            }

            return sb.ToString();
        }

        #endregion
    }

Visual Basic

Imports Microsoft.SqlServer.Server
Imports Microsoft.VisualBasic
Imports System
Imports System.Collections
Imports System.Data
Imports System.Data.SqlClient
Imports System.Data.SqlTypes
Imports System.Diagnostics
Imports System.Globalization
Imports System.Reflection
Imports System.Runtime.InteropServices
Imports System.Text

''' <summary>
''' AssemblyBrowser is a simple utility for composing sql queries over 
''' assembly metadata. It uses a table-valued-function to return
''' a table to SqlServer.
''' </summary>

Public NotInheritable Class AssemblyBrowser
    ''' <summary>
    ''' Get the types in the assembly, as a table
    ''' </summary>
    ''' <param name="name"></param>
    ''' <returns></returns>
    <Microsoft.SqlServer.Server.SqlFunction(FillRowMethodName:="FillTypeRow", Name:="GetTypes", _
        TableDefinition:="FullName nvarchar(256), BaseTypeName nvarchar(256), IsValueType bit, NumFields int, IsSerializable bit, IsISerializable bit, IsLayoutSequential bit, Namespace nvarchar(256), IsPublic bit, IsSealed bit, AssemblyName nvarchar(256)")> _
    Public Shared Function GetTypes(ByVal name As String) As IEnumerable
        Dim e As IEnumerable

        Try
            Dim a As [Assembly] = GetAssembly(name)
            If a Is Nothing Then
                e = New Type(-1) {}
            Else
                e = a.GetTypes()
            End If

        Catch te As ReflectionTypeLoadException
            'could not load some of the types, just return the types that you could load
            e = te.Types
        End Try

        Return e
    End Function

    ''' <summary>
    ''' Called by SQL Server to populate a row in the results of the TVF.  Takes a type and
    ''' breaks the information up into separate columns for the row being generated.
    ''' </summary>
    ''' <param name="row"></param>
    ''' <param name="fullName"></param>
    ''' <param name="baseTypeName"></param>
    ''' <param name="isValueType"></param>
    ''' <param name="numFields"></param>
    ''' <param name="isSerializable"></param>
    ''' <param name="isISerializable"></param>
    ''' <param name="isLayoutSequential"></param>
    ''' <param name="namespace"></param>
    ''' <param name="isPublic"></param>
    ''' <param name="isSealed"></param>
    ''' <param name="assemblyName"></param>
    ''' <remarks></remarks>
    Public Shared Sub FillTypeRow(ByVal row As Object, <Out()> ByRef fullName As String, <Out()> ByRef baseTypeName As String, _
        <Out()> ByRef isValueType As Boolean, <Out()> ByRef numFields As Integer, <Out()> ByRef isSerializable As Boolean, _
        <Out()> ByRef isISerializable As Boolean, <Out()> ByRef isLayoutSequential As Boolean, <Out()> ByRef [namespace] As String, _
        <Out()> ByRef isPublic As Boolean, <Out()> ByRef isSealed As Boolean, <Out()> ByRef assemblyName As String)

        If row Is Nothing Then
            Return
        End If

        Dim t As Type = CType(row, Type)

        fullName = t.FullName
        If (t.BaseType Is Nothing) Then
            baseTypeName = String.Empty
        Else
            baseTypeName = t.BaseType.FullName
        End If

        isValueType = t.IsValueType

        Dim fields As FieldInfo() = t.GetFields(BindingFlags.Instance Or BindingFlags.Public)

        If (fields Is Nothing) Then
            numFields = 0
        Else
            numFields = fields.Length
        End If

        isSerializable = t.IsSerializable
        isISerializable = GetType(System.Runtime.Serialization.ISerializable).IsAssignableFrom(t)
        isLayoutSequential = t.IsLayoutSequential
        [namespace] = t.Namespace
        isPublic = t.IsPublic
        isSealed = t.IsSealed
        assemblyName = t.Assembly.GetName().Name
    End Sub

    Friend Shared Function GetAssembly(ByVal name As String) As [Assembly]
        Try
            Return [Assembly].Load(name)
        Catch
            Return Nothing
        End Try
    End Function

    Private Sub New()
    End Sub

    <SqlFunction(FillRowMethodName:="FillAssemblyRow", Name:="GetLoadedAssemblies", _
        TableDefinition:="FullName nvarchar(256)")> _
    Public Shared Function GetLoadedAssemblies() As IEnumerable
        Dim e As IEnumerable = AppDomain.CurrentDomain.GetAssemblies()
        'Dim schemas() As Microsoft.SqlServer.Server.SqlMetaData = _
        '    {New Microsoft.SqlServer.Server.SqlMetaData("FullName", _
        '    SqlDbType.NVarChar, 256)}

        Return e
    End Function
    Public Shared Sub FillAssemblyRow(ByVal row As Object, <Out()> ByRef fullName As String)
        If row Is Nothing Then Throw New ArgumentNullException("row")
        fullName = CType(row, [Assembly]).FullName
    End Sub
End Class
<Microsoft.SqlServer.Server.SqlUserDefinedTypeAttribute(Microsoft.SqlServer.Server.Format.Native), Serializable()> _
Public Structure SimpleUdt
    Implements INullable
#Region "udt contract"

    Public Overrides Function ToString() As String
        Return Value.ToString()
    End Function

    Public ReadOnly Property IsNull() As Boolean Implements INullable.IsNull
        Get
            Return Me.Value.IsNull
        End Get
    End Property

    Public Shared ReadOnly Property Null() As SimpleUdt
        Get
            Dim h As New SimpleUdt()

            Return h
        End Get
    End Property

    Public Shared Function Parse(ByVal sqlString As SqlString) As SimpleUdt
        If sqlString.IsNull Then
            Return Null
        End If

        Dim simpleUdt As New SimpleUdt()

        simpleUdt.Value = New SqlInt32(Integer.Parse(sqlString.Value, _
            System.Globalization.CultureInfo.InvariantCulture))

        Return simpleUdt
    End Function
#End Region

#Region "implementation"
    Private privValue As SqlInt32

    Private _examplePublicField As SqlInt32

    Public Property ExamplePublicField() As SqlInt32
        Get
            Return Me._examplePublicField
        End Get
        Set(ByVal value As SqlInt32)
            Me._examplePublicField = value
        End Set
    End Property

    Public Property Value() As SqlInt32
        Get
            Return Me.privValue
        End Get
        Set(ByVal value As SqlInt32)
            Me.privValue = value
        End Set
    End Property

    <Microsoft.SqlServer.Server.SqlMethod(IsDeterministic:=True)> _
    Public Function ReturnValue() As SqlInt32
        Return Me.privValue
    End Function
#End Region
End Structure
Public NotInheritable Class UdtServices
#Region "udt fields"

    ''' <summary>
    ''' Get the fields in the UDT callable from tsql, as a table
    ''' </summary>
    ''' <param name="udtName"></param>
    ''' <returns></returns>
    <Microsoft.SqlServer.Server.SqlFunction(FillRowMethodName:="FillFieldRow", Name:="GetFields", TableDefinition:="Name nvarchar(128), Type nvarchar(128), RoutineProperties nvarchar(128)")> _
    Public Shared Function GetUdtFields(ByVal udtName As String) As IEnumerable
        Dim fields As ArrayList = GetSqlFields(GetUdt(udtName))

        Return fields
    End Function
    Public Shared Sub FillFieldRow(ByVal row As Object, ByRef [name] As String, ByRef type As String)
        Dim fi As FieldInfo = CType(row, FieldInfo)

        [name] = fi.Name
        type = fi.FieldType.Name
    End Sub


#End Region

#Region "udt properties"

    ''' <summary>
    ''' Get the properties defined in a particular UDT
    ''' </summary>
    ''' <param name="udtName"></param>
    ''' <returns></returns>
    <Microsoft.SqlServer.Server.SqlFunction(FillRowMethodName:="FillPropertyRow", Name:="GetProperties", TableDefinition:="Name nvarchar(128), Type nvarchar(128), RoutineProperties nvarchar(128)")> _
    Public Shared Function GetUdtProperties(ByVal udtName As String) As IEnumerable
        Dim properties As ArrayList = GetSqlProperties(GetUdt(udtName))

        Return properties
    End Function

    ''' <summary>
    ''' Called by SQL Server to populate a row of the results of the TVF.  
    ''' </summary>
    ''' <param name="row"></param>
    ''' <param name="name"></param>
    ''' <param name="type"></param>
    ''' <param name="routineProperties"></param>
    ''' <remarks></remarks>
    Public Shared Sub FillPropertyRow(ByVal row As Object, ByRef name As String, ByRef type As String, ByRef routineProperties As String)
        Dim pi As PropertyInfo = CType(row, PropertyInfo)

        name = pi.Name
        type = pi.PropertyType.Name

        Dim methInfo As MethodInfo = pi.GetGetMethod()
        Dim attrs As Object() = methInfo.GetCustomAttributes( _
            GetType(Microsoft.SqlServer.Server.SqlMethodAttribute), True)

        If Not (attrs Is Nothing) AndAlso attrs.Length = 1 Then
            Dim attr As Microsoft.SqlServer.Server.SqlMethodAttribute _
                = CType(attrs(0), Microsoft.SqlServer.Server.SqlMethodAttribute)

            routineProperties = GetRoutineProperties(attr)
        End If
    End Sub

#End Region

#Region "udt methods"

    ''' <summary>
    ''' Get the methods on the UDT callable from tsql, as a table
    ''' </summary>
    ''' <param name="udtName"></param>
    ''' <returns></returns>
    <Microsoft.SqlServer.Server.SqlFunction(FillRowMethodName:="FillMethodRow", Name:="GetMethods", TableDefinition:="Name nvarchar(128), Parameters nvarchar(4000), Type nvarchar(128), RoutineProperties nvarchar(128)")> _
    Public Shared Function GetUdtMethods(ByVal udtName As String) As IEnumerable
        Dim methods As ArrayList = GetSqlMethods(GetUdt(udtName))

        Return methods
    End Function

    ''' <summary>
    ''' Called by SQL Server to populate a row being returned by the TVF.  Breaks apart the 
    ''' MethodInfo object into the data which will populate each column of the row being returned.
    ''' </summary>
    ''' <param name="row"></param>
    ''' <param name="name"></param>
    ''' <param name="parameters"></param>
    ''' <param name="type"></param>
    ''' <param name="routineProperties"></param>
    ''' <remarks></remarks>
    Public Shared Sub FillMethodRow(ByVal row As Object, ByRef name As String, ByRef parameters As String, _
        ByRef type As String, ByRef routineProperties As String)
        Dim methInfo As MethodInfo = CType(row, MethodInfo)

        name = methInfo.Name

        Dim sb As New StringBuilder("(")
        Dim first As Boolean = True

        Dim pi As ParameterInfo
        For Each pi In methInfo.GetParameters()
            If first Then
                first = False
            Else
                sb.Append(", ")
            End If

            sb.Append(pi.Name).Append(" ").Append(pi.ParameterType.Name)
        Next pi

        sb.Append(")")
        parameters = sb.ToString()
        type = methInfo.ReturnType.Name

        Dim attrs As Object() = methInfo.GetCustomAttributes( _
            GetType(Microsoft.SqlServer.Server.SqlMethodAttribute), True)

        If Not (attrs Is Nothing) AndAlso attrs.Length = 1 Then
            Dim attr As Microsoft.SqlServer.Server.SqlMethodAttribute _
                = CType(attrs(0), Microsoft.SqlServer.Server.SqlMethodAttribute)

            routineProperties = GetRoutineProperties(attr)
        End If
    End Sub

#End Region

#Region "internal utility functions"
    Private Sub New()
    End Sub

    ''' <summary>
    ''' Utility function to get the string representation of
    ''' routine properties on a type
    ''' </summary>
    ''' <param name="attr"></param>
    ''' <returns></returns>
    Private Shared Function GetRoutineProperties(ByVal attr As Microsoft.SqlServer.Server.SqlMethodAttribute) As String
        Dim sb As New StringBuilder()

        If attr.OnNullCall Then
            sb.Append("on_null_call ")
        End If

        If attr.IsMutator Then
            sb.Append("mutator ")
        End If

        If attr.IsDeterministic Then
            sb.Append("deterministic ")
        End If

        If attr.IsPrecise Then
            sb.Append("precise ")
        End If

        If attr.DataAccess <> Microsoft.SqlServer.Server.DataAccessKind.None Then
            sb.Append("data_access " & [Enum].GetName( _
                GetType(Microsoft.SqlServer.Server.DataAccessKind), attr.DataAccess))
        End If

        Return sb.ToString()
    End Function

    ''' <summary>
    ''' Is this a valid parameter type that can be accessible from tsql
    ''' </summary>
    ''' <param name="t"></param>
    ''' <returns></returns>
    Private Shared Function IsSqlParameterType(ByVal t As Type) As Boolean
        If validParameterTypes.ContainsKey(t) Then
            Return True
        End If

        If t.FullName.StartsWith("System.Data.SqlTypes") Then
            Return True
        End If

        If t.GetCustomAttributes( _
            GetType(Microsoft.SqlServer.Server.SqlUserDefinedTypeAttribute), _
            True).Length = 1 Then
            Return True
        End If

        Return False
    End Function

    ''' <summary>
    ''' Is the field type valid?
    ''' </summary>
    ''' <param name="f"></param>
    ''' <param name="declaringType"></param>
    ''' <returns></returns>
    Private Shared Function IsSqlField(ByVal f As FieldInfo, ByVal declaringType As Type) As Boolean
        If Not f.DeclaringType Is declaringType Then
            Return False
        End If

        Return IsSqlParameterType(f.FieldType)
    End Function

    ''' <summary>
    ''' Is the property valid to be called from tsql?
    ''' </summary>
    ''' <param name="f"></param>
    ''' <param name="declaringType"></param>
    ''' <returns></returns>
    Private Shared Function IsSqlProperty(ByVal f As PropertyInfo, ByVal declaringType As Type) As Boolean
        If Not f.DeclaringType Is declaringType Then
            Return False
        End If

        Return IsSqlParameterType(f.PropertyType)
    End Function

    ''' <summary>
    ''' Is the method valid to be called from tsql?
    ''' </summary>
    ''' <param name="m"></param>
    ''' <param name="declaringType"></param>
    ''' <returns></returns>
    Private Shared Function IsSqlMethod(ByVal m As MethodInfo, ByVal declaringType As Type) As Boolean
        If Not m.DeclaringType Is declaringType Then
            Return False
        End If

        Dim info As ParameterInfo
        For Each info In m.GetParameters()
            If Not IsSqlParameterType(info.ParameterType) Then
                Return False
            End If
        Next info

        Return IsSqlParameterType(m.ReturnType)
    End Function

    ''' <summary>
    ''' Get the udt specified by the clr type name.
    ''' </summary>
    ''' <param name="udtName"></param>
    ''' <returns></returns>
    Private Shared Function GetUdt(ByVal udtName As String) As Type
        Return Type.GetType(udtName, True)
    End Function

    ''' <summary>
    ''' Get the methods on a type
    ''' </summary>
    ''' <param name="t"></param>
    ''' <returns></returns>
    Private Shared Function GetSqlMethods(ByVal t As Type) As ArrayList
        Dim methods As MethodInfo() = t.GetMethods(BindingFlags.Instance Or BindingFlags.Public Or BindingFlags.DeclaredOnly)
        Dim temp As New ArrayList()

        Dim info As MethodInfo
        For Each info In methods
            If IsSqlMethod(info, t) Then
                temp.Add(info)
            End If
        Next info

        Return temp
    End Function

    ''' <summary>
    ''' get the properties on a type
    ''' </summary>
    ''' <param name="t"></param>
    ''' <returns></returns>
    Private Shared Function GetSqlProperties(ByVal t As Type) As ArrayList
        Dim props As PropertyInfo() = t.GetProperties(BindingFlags.Instance Or BindingFlags.Public Or BindingFlags.DeclaredOnly)
        Dim temp As New ArrayList()

        Dim info As PropertyInfo
        For Each info In props
            If IsSqlProperty(info, t) Then
                temp.Add(info)
            End If
        Next info

        Return temp
    End Function

    ''' <summary>
    ''' get the fields on a type
    ''' </summary>
    ''' <param name="t"></param>
    ''' <returns></returns>
    Private Shared Function GetSqlFields(ByVal t As Type) As ArrayList
        Dim fields As FieldInfo() = t.GetFields(BindingFlags.Instance Or BindingFlags.Public Or BindingFlags.DeclaredOnly)
        Dim temp As New ArrayList()

        Dim info As FieldInfo
        For Each info In fields
            If IsSqlField(info, t) Then
                temp.Add(info)
            End If
        Next info

        Return temp
    End Function

    ''' <summary>
    ''' readonly static used to cache frequently used information
    ''' </summary>
    Private Shared ReadOnly validParameterTypes As Hashtable = GetValidParameterTypes()

    ''' <summary>
    ''' initialize the cached mapping of valid parameter types
    ''' </summary>
    Private Shared Function GetValidParameterTypes() As Hashtable
        Dim validTypes As New Hashtable()

        validTypes(GetType(Boolean)) = True
        validTypes(GetType(Byte)) = True
        validTypes(GetType(Short)) = True
        validTypes(GetType(Char)) = True
        validTypes(GetType(Integer)) = True
        validTypes(GetType(Single)) = True
        validTypes(GetType(Long)) = True
        validTypes(GetType(Double)) = True
        validTypes(GetType(String)) = True
        validTypes(GetType(Guid)) = True

        Return validTypes
    End Function
#End Region

#Region "public utility functions"

    <Microsoft.SqlServer.Server.SqlFunction(DataAccess:=Microsoft.SqlServer.Server.DataAccessKind.Read)> _
    Public Shared Function GetFullAssemblyName(ByVal sqlName As String) As String
        Using conn As New SqlConnection("context connection=true")
            Dim cmd As SqlCommand = conn.CreateCommand()
            cmd.CommandText = "SELECT @sqlName, " _
                & "assemblyproperty(@sqlName, 'VersionMajor'), " _
                & "assemblyproperty(@sqlName, 'VersionMinor'), " _
                & "assemblyproperty(@sqlName, 'VersionBuild'), " _
                & "assemblyproperty(@sqlName, 'VersionRevision'), " _
                & "assemblyproperty(@sqlName, 'CultureInfo'), " _
                & "assemblyproperty(@sqlName, 'PublicKey'), " _
                & "assemblyproperty(@sqlName, 'Architecture');"

            cmd.Parameters.AddWithValue("@sqlName", sqlName)
            conn.Open()
            Dim rdr As SqlDataReader = cmd.ExecuteReader()
            If Not rdr.Read() Then
                Throw New ArgumentException( _
                    String.Format(System.Globalization.CultureInfo.InvariantCulture, _
                    "Assembly {0} does not exist.", sqlName))
            End If

            Dim culture As SqlString
            Dim publicKeyToken As SqlBinary

            If (rdr.IsDBNull(5)) Then
                culture = SqlString.Null
            Else
                culture = rdr.GetSqlString(5)
            End If

            If (rdr.IsDBNull(6)) Then
                publicKeyToken = SqlBinary.Null
            Else
                publicKeyToken = rdr.GetSqlBinary(6)
            End If

            Return GetAssemblyName(rdr.GetString(0), rdr.GetInt32(1), rdr.GetInt32(2), _
                rdr.GetInt32(3), rdr.GetInt32(4), culture, publicKeyToken)
        End Using
    End Function

    ''' <summary>
    ''' Helper function to return the assembly name from 
    ''' its components stored in sql metadata.
    ''' </summary>
    ''' <param name="friendlyName"></param>
    ''' <param name="majorVersion"></param>
    ''' <param name="minorVersion"></param>
    ''' <param name="build"></param>
    ''' <param name="revision"></param>
    ''' <param name="culture"></param>
    ''' <param name="publicKeyToken"></param>
    ''' <returns></returns>
    Private Shared Function GetAssemblyName(ByVal friendlyName As String, ByVal majorVersion As Integer, ByVal minorVersion As Integer, ByVal build As Integer, ByVal revision As Integer, ByVal culture As SqlString, ByVal publicKeyToken As SqlBinary) As String
        Dim sb As New StringBuilder()
        sb.Append(friendlyName).Append(","c)
        sb.Append("Version=")
        sb.Append(majorVersion).Append("."c)
        sb.Append(minorVersion).Append("."c)
        sb.Append(build).Append("."c)
        sb.Append(revision).Append(","c)
        sb.Append("Culture=")
        If (culture.IsNull) Then
            sb.Append("neutral")
        Else
            sb.Append(culture.Value)
        End If

        sb.Append(","c)
        sb.Append("PublicKeyToken=")
        If publicKeyToken.IsNull Then
            sb.Append("null")
        Else
            Dim b As Byte
            For Each b In publicKeyToken.Value
                sb.Append(b.ToString("X2", CultureInfo.InvariantCulture))
            Next b
        End If

        Return sb.ToString()
    End Function

    Private Shared Function ToHexString(ByVal value() As Byte) As String
        If value Is Nothing Then
            Return Nothing
        End If

        Dim sb As New StringBuilder()
        Dim b As Byte

        For Each b In value
            sb.Append(b.ToString("X2", CultureInfo.InvariantCulture))
        Next b

        Return sb.ToString()
    End Function
#End Region
End Class

Это скрипт установки Transact-SQL (Install.sql), который выполняет развертывание сборки и создает в базе данных функции.

USE AdventureWorks2012;
GO

IF EXISTS (SELECT * FROM sys.procedures WHERE [name] = 'usp_LoadTest')
DROP PROCEDURE usp_LoadTest;
GO

IF EXISTS (SELECT * FROM sys.objects WHERE [name] = N'GetTypes' AND (type = 'FS' OR type = 'FT'))  
DROP FUNCTION [GetTypes];
GO

IF EXISTS (SELECT * FROM sys.objects WHERE [name] = N'GetFields' AND (type = 'FS' OR type = 'FT'))  
DROP FUNCTION [GetFields];
GO

IF EXISTS (SELECT * FROM sys.objects where [name] = N'GetProperties' AND (type = 'FS' OR type = 'FT'))  
DROP FUNCTION [GetProperties];
GO

IF EXISTS (SELECT * FROM sys.objects WHERE [name] = N'GetMethods' AND (type = 'FS' OR type = 'FT'))  
DROP FUNCTION [GetMethods];
GO

IF EXISTS (SELECT * FROM sys.objects WHERE [name] = N'GetFullAssemblyName' AND (type = 'FS' OR type = 'FT'))  
DROP FUNCTION [GetFullAssemblyName];
GO

IF EXISTS (SELECT * FROM sys.objects WHERE [name] = N'GetLoadedAssemblies' AND (type = 'FS' OR type = 'FT'))  
DROP FUNCTION [GetLoadedAssemblies];
GO

IF EXISTS (SELECT * FROM sys.objects WHERE [name] = N'GetClrTypeName' AND (type = 'FN' or type = 'FS' OR type = 'FT'))  
DROP FUNCTION [GetClrTypeName];
GO

IF EXISTS (SELECT * FROM sys.types WHERE [name] = N'SimpleUdt')
DROP TYPE SimpleUdt;
GO

IF EXISTS (SELECT * FROM sys.assemblies WHERE [name] = N'UDTUtilities') 
DROP ASSEMBLY UDTUtilities;
GO

USE master
GO

IF EXISTS (SELECT * FROM sys.server_principals WHERE [name] = 'ExternalSample_Login')
DROP LOGIN ExternalSample_Login;
GO

IF EXISTS (SELECT * FROM sys.asymmetric_keys WHERE [name] = 'ExternalSample_Key')
DROP ASYMMETRIC KEY ExternalSample_Key;
GO

--Before we register the assembly to SQL Server, we must arrange for the appropriate permissions.
--Assemblies with unsafe or external_access permissions can only be registered and operate correctly
--if either the database trustworthy bit is set or if the assembly is signed with a key,
--that key is registered with SQL Server, a server principal is created from that key,
--and that principal is granted the external access or unsafe assembly permission.  We choose
--the latter approach as it is more granular, and therefore safer.  You should never
--register an assembly with SQL Server (especially with external_access or unsafe permissions) without
--thoroughly reviewing the source code of the assembly to make sure that its actions 
--do not pose an operational or security risk for your site.

DECLARE @SamplesPath nvarchar(1024)
-- You may need to modify the value of the this variable if you have installed the sample someplace other than the default location.
set @SamplesPath = 'C:\MySample\'
EXEC('CREATE ASYMMETRIC KEY ExternalSample_Key FROM EXECUTABLE FILE = ''' + @SamplesPath + 'UDTUtilities.dll'';');
CREATE LOGIN ExternalSample_Login FROM ASYMMETRIC KEY ExternalSample_Key
GRANT EXTERNAL ACCESS ASSEMBLY TO ExternalSample_Login
GO

USE AdventureWorks2012;
GO

DECLARE @SamplesPath nvarchar(1024)
-- You may need to modify the value of the this variable if you have installed the sample someplace other than the default location.
set @SamplesPath = 'C:\MySample\'

CREATE ASSEMBLY UDTUtilities FROM @SamplesPath + 'UDTUtilities.dll'
WITH permission_set=External_Access;
GO

CREATE FUNCTION [GetTypes](@input nvarchar(4000)) 
RETURNS  
TABLE
(
    FullName nvarchar(256),
    BaseTypeName nvarchar(256),
    IsValueType bit,
    NumFields int,
    IsSerializable bit,
    IsISerializable bit,
    IsLayoutSequential bit,
    Namespace nvarchar(256),
    IsPublic bit,
    IsSealed bit,
    AssemblyName nvarchar(256)
)
AS EXTERNAL NAME [UDTUtilities].[AssemblyBrowser].[GetTypes];
GO

CREATE FUNCTION [dbo].[GetLoadedAssemblies]() 
RETURNS 
TABLE
(
  FullName nvarchar(256)
)
AS EXTERNAL NAME [UDTUtilities].[AssemblyBrowser].[GetLoadedAssemblies]
GO  

CREATE FUNCTION [dbo].[GetFields](@udtName nvarchar(4000)) 
RETURNS  
TABLE
(
   -- fieldInformation nvarchar(128),
    Name nvarchar(128),
    Type nvarchar(128)

)
AS EXTERNAL NAME [UDTUtilities].[UdtServices].[GetUdtFields];
GO


CREATE FUNCTION [dbo].[GetProperties](@udtName nvarchar(4000)) 
RETURNS  
TABLE
(
    Name nvarchar(128),
    Type nvarchar(128),
    FieldProperties nvarchar(128)
)
AS EXTERNAL NAME [UDTUtilities].[UdtServices].[GetUdtProperties];
GO


CREATE FUNCTION [dbo].[GetMethods](@udtName nvarchar(4000)) 
RETURNS
TABLE
(
    Name nvarchar(128),
    Parameters nvarchar(4000),
    Type nvarchar(128),
    RoutineProperties nvarchar(128)
)
AS EXTERNAL NAME [UDTUtilities].[UdtServices].[GetUdtMethods];
GO

CREATE FUNCTION [dbo].[GetFullAssemblyName](@sqlAsmName nvarchar(128)) 
RETURNS nvarchar(4000)
AS EXTERNAL NAME [UDTUtilities].[UdtServices].[GetFullAssemblyName]
GO

CREATE FUNCTION [dbo].[GetClrTypeName]
(
    @sqlTypeName nvarchar(128) 
) 
RETURNS nvarchar(4000)
AS
BEGIN
    DECLARE @result nvarchar(4000)
    SELECT @result = st.assembly_class 
    + ',' 
      + dbo.GetFullAssemblyName(sa.name)
    FROM sys.assembly_types st 
        INNER JOIN sys.assemblies sa 
        ON st.assembly_id = sa.assembly_id
    WHERE st.name = @sqlTypeName;

    RETURN @result;
END
GO

CREATE TYPE [dbo].[SimpleUdt]
EXTERNAL NAME
[UDTUtilities].[SimpleUdt];
GO

Это файл test.sql, который проверяет образец, выполняя его функции.

USE AdventureWorks2012;
GO

-- Get the full CLR name for UDTUtilities
SELECT dbo.GetFullAssemblyName(N'UDTUtilities');
GO

-- Get all the types in this dll
SELECT * FROM dbo.GetTypes(dbo.GetFullAssemblyName(N'UDTUtilities')); 
GO

-- Get the full CLR name for SimpleUdt
SELECT dbo.GetClrTypeName('SimpleUdt');
GO

-- Get the methods on the SimpleUdt type
SELECT * FROM dbo.GetMethods(dbo.GetClrTypeName('SimpleUdt'));
GO

-- More complex query to dump all the methods for all the types in the system
SELECT 
    st.name AS TypeName, 
    methods.Name AS MethodName, 
    methods.Parameters, 
    methods.Type, 
    methods.RoutineProperties 
FROM sys.assembly_types st 
    CROSS APPLY dbo.GetMethods(dbo.GetClrTypeName(st.name)) methods
GO

В следующем образце Transact-SQL сборка и функции удаляются из базы данных.

USE AdventureWorks2012;
GO

IF EXISTS (SELECT * FROM sys.procedures WHERE [name] = 'usp_LoadTest')
DROP PROCEDURE usp_LoadTest;
GO

IF EXISTS (SELECT * FROM sys.objects WHERE [name] = N'GetTypes' AND (type = 'FS' OR type = 'FT'))  
DROP FUNCTION [GetTypes];
GO

IF EXISTS (SELECT * FROM sys.objects WHERE [name] = N'GetFields' AND (type = 'FS' OR type = 'FT'))  
DROP FUNCTION [GetFields];
GO

IF EXISTS (SELECT * FROM sys.objects where [name] = N'GetProperties' AND (type = 'FS' OR type = 'FT'))  
DROP FUNCTION [GetProperties];
GO

IF EXISTS (SELECT * FROM sys.objects WHERE [name] = N'GetMethods' AND (type = 'FS' OR type = 'FT'))  
DROP FUNCTION [GetMethods];
GO

IF EXISTS (SELECT * FROM sys.objects WHERE [name] = N'GetFullAssemblyName' AND (type = 'FS' OR type = 'FT'))  
DROP FUNCTION [GetFullAssemblyName];
GO

IF EXISTS (SELECT * FROM sys.objects WHERE [name] = N'GetLoadedAssemblies' AND (type = 'FS' OR type = 'FT'))  
DROP FUNCTION [GetLoadedAssemblies];
GO

IF EXISTS (SELECT * FROM sys.objects WHERE [name] = N'GetClrTypeName' AND (type = 'FN' or type = 'FS' OR type = 'FT'))  
DROP FUNCTION [GetClrTypeName];
GO

IF EXISTS (SELECT * FROM sys.types WHERE [name] = N'SimpleUdt')
DROP TYPE SimpleUdt;
GO

IF EXISTS (SELECT * FROM sys.assemblies WHERE [name] = N'UDTUtilities') 
DROP ASSEMBLY UDTUtilities;
GO

USE master;
GO
IF EXISTS (SELECT * FROM sys.server_principals WHERE [name] = 'ExternalSample_Login')
DROP LOGIN ExternalSample_Login;
GO

IF EXISTS (SELECT * FROM sys.asymmetric_keys WHERE [name] = 'ExternalSample_Key')
DROP ASYMMETRIC KEY ExternalSample_Key;
GO

USE AdventureWorks2012;
GO

См. также

Основные понятия

Сценарии использования и примеры интеграции со средой CLR

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