UDT 实用工具
UDT 实用工具示例包括很多实用工具函数。 其中包括向 Transact-SQL 公开程序集元数据的函数、以表的形式返回程序集中的类型的示例流式表值函数，以及返回用户定义数据类型的字段、方法和属性的函数。 演示的技术包括流式表值函数、.NET Framework 反射 API 以及从 Transact-SQL 中调用表值函数。
先决条件
若要创建和运行此项目，必须安装下列软件：
SQL Server 或 SQL Server Express。 您可以从 SQL Server Express 文档和示例网站免费获取 SQL Server Express。
AdventureWorks2012 数据库，在 Codeplex 网站提供
.NET Framework SDK 2.0 或更高版本，或 Microsoft Visual Studio 2005 或更高版本。 您可以免费获取 .NET Framework SDK。
此外，还必须满足以下条件：
您使用的 SQL Server 实例必须已启用 CLR 集成。
若要启用 CLR 集成，请执行以下步骤：
启用 CLR 集成
- 执行以下 Transact-SQL 命令：
sp_configure 'clr enabled', 1;
GO
RECONFIGURE;
GO
.gif "注意")
注意若要启用 CLR，您必须具有 ALTER SETTINGS 服务器级别权限，sysadmin 和 serveradmin 固定服务器角色的成员隐式拥有该权限。
必须在您使用的 SQL Server 实例上安装 AdventureWorks2012 数据库。
如果您不是要使用的 SQL Server 实例的管理员，则必须让管理员授予您 CreateAssembly 权限，才能完成安装。
生成示例
按照以下说明创建和运行该示例：
打开 Visual Studio 或 .NET Framework 命令提示符。
如有必要，为您的示例创建目录。 对于此示例，我们将使用 C:\MySample。
由于此示例需要签名的程序集，请通过键入以下命令创建一个非对称密钥：
sn -k SampleKey.snk
从命令行提示符执行以下代码之一（具体取决于所选的语言)，对示例代码进行编译。
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
将 Transact-SQL 安装代码复制到一个文件中，并在示例目录中将其另存为 Install.sql。
通过执行以下命令部署程序集和存储过程：
- sqlcmd -E -I -i install.sql -v root = "C:\MySample\"
将 Transact-SQL 测试命令脚本复制到一个文件中，并在示例目录中将其另存为 test.sql。
使用以下命令执行测试脚本：
- sqlcmd -E -I -i test.sql
将 Transact-SQL 清除脚本复制到一个文件中，并在示例目录中将其另存为 cleanup.sql。
使用以下命令执行该脚本：
- sqlcmd -E -I -i cleanup.sql
示例代码
下面是此示例的代码列表。
C#
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
这是 Transact-SQL 安装脚本 (Install.sql)，该脚本在数据库中部署程序集并创建函数。
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
这是 test.sql，该脚本通过执行函数测试该示例。
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
下面的 Transact-SQL 从数据库中删除程序集和函数。
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