SQLSERVER数据库管理员的专用连接DAC DAC： Dedicated Admin Connection 当 SQL Server 因系统资源不足，或其它异常导致无法建立数据库连接时， 可以使用系统预留的 DAC 连接到数据库，进行一些问题诊断和故障排除。DAC只能使用有限的资源。请勿使用DAC运行
SQLSERVER数据库管理员的专用连接DAC
DAC： Dedicated Admin Connection
当 SQL Server 因系统资源不足，或其它异常导致无法建立数据库连接时， 可以使用系统预留的 DAC 连接到数据库，进行一些问题诊断和故障排除。DAC只能使用有限的资源。请勿使用DAC运行需要消耗大量资源的查询，否则可能发生严重的阻塞。
如何启用DAC功能 专用管理员连接功能以及注意事项
1、只有系統管理員(sysadmin)角色相關成員可以使用DAC連接存取SQL Server(Local)本地连接
2、一個執行個體只能存在一個DAC。
3、使用DAC通常是讓DBA查詢和排解SQL Server問題(當無法正常連接執行個體)，
4、好比執行sp_who2、Kill SPID、DBCC SQLPERF、DBCC DROPCLEANBUFFERS …等,使用DAC連接時，切勿執行需耗費大量資源的命令，如DBCC CHECKDB、DBCC SHRINKDATABASE..等
5、 使用DAC登录才能修改系统表或者查看系统表，以前SQL2000的时候你可以随便修改系统表，到了SQL2005就开始限制您了
开启DAC的SQL
1 USE master 2 GO 3 sp_configure ' show advanced options ' , 1 4 GO 5 sp_configure ' remote admin connections ' , 1 6 GO 7 RECONFIGURE WITH OVERRIDE 8 GO 9 10 11 SELECT * FROM sys.configurations where name = ' remote admin connections '
也可以在外围应用配置器那里开启
命令行下使用DAC登录
sqlcmd加上 /A 选项 专用管理连接
sqlcmd /S JOE /E /A
1>DBCC DROPCLEANBUFFERS
2>GO
排错和诊断的SQL
1 SELECT * FROM sys.dm_tran_locks 2 SELECT * FROM sys.dm_os_memory_cache_counters 3 SELECT * FROM sys.dm_exec_requests 4 SELECT * FROM sys.dm_exec_sessions
例如查询 sys.dm_tran_locks 以了解锁定状态
查询 sys.dm_os_memory_cache_counters ，检查缓存数量
查询sys.dm_exec_requests 和 sys.dm_exec_sessions 以了解活动的会话和请求。
避免使用需要消耗大量资源的 DMV（例如，sys.dm_tran_version_store 需要扫描整个版本存储区，并且会导致大量的 I/O）或使用了复杂联接的 DMV
在sqlserver management studio中使用DAC连接的时候，要选择新建查询或者数据库引擎查询，不能使用一上来默认的那个登录框进行DAC连接登录，那个
是连接数据库引擎的，如果用DAC连数据库引擎，会报不支持DAC连接。
下面说一下DAC侦听的端口号
若要了解 DAC 所侦听的端口号，可以看SQL错误日志
SQL错误日志
消息
Dedicated admin connection support was established for listening remotely on port 1434.
其他有关DAC错误日志的消息：
消息
Could not connect because the maximum number of '1' dedicated administrator connections already exists. Before a new connection can be made, the existing dedicated administrator connection must be dropped, either by logging off or ending the process. [客户端: 127.0.0.1]
消息
Configuration option 'remote admin connections' changed from 1 to 1. Run the RECONFIGURE statement to install
DAC的本地连接和远程连接的方式：
如果将 SQL Server 配置为接受远程管理连接，则必须使用显式端口号启动 DAC：
sqlcmd –Stcp: ,
sqlcmd /Stcp:192.168.1.100,1434 /U sa /P test
SQL Server 错误日志列出了 DAC 的端口号，默认情况下为 1434。
如果将 SQL Server 配置为只接受本地 DAC 连接，请使用以下命令和环回适配器进行连接：
或者
sqlcmd加上 /A 选项 专用管理连接
sqlcmd /S JOE /E /A
或者
或者
总结：经过本人的实验，发现无论你是用sqlcmd或者SSMS，本地连接还是远程连接，都要使用这种方式
sqlcmd –Stcp: ,
远程：sqlcmd /Stcp:192.168.1.100,1434 /U sa /P test
网上有些文章说不用加端口号，启用SQL Browser服务，就可以连接SQLSERVER，实际上不加1434端口号的话，已经不是在使用DAC来
连接SQLSERVER了，不加1434端口号使用的只是普通连接
2013-11-30补充：
反编译了一下DAC的DLL
在下面的公用DLL路径
DAC功能应该就是调用这个路径下的C:\Program Files\Microsoft SQL Server\100\SDK\Assemblies\Microsoft.SqlServer.Management.Dac.dll
用 ILSpy 这个工具来反编译，实际上SQLSRVER很多功能组件都是用.NET来编写的
除非一些核心功能组件用C++或者C，你们会发现很多DLL都可以用 ILSpy 这个.NET反编译工具来反编译
微乳并没有混淆他们的代码，这些如果没有开发文档的话，要理解这些代码的层次结构和意思会比较困难
其中一个类的代码
1 using Microsoft.SqlServer.Management.Common;
2 using Microsoft.SqlServer.Management.Smo;
3 using Microsoft.SqlServer.Management.SmoMetadataProvider;
4 using Microsoft.SqlServer.Management.SqlParser.Common;
5 using Microsoft.SqlServer.Management.SqlParser.Metadata;
6 using Microsoft.SqlServer.Management.SqlParser.MetadataDifferencer;
7 using Microsoft.SqlServer.Management.SqlParser.MetadataServices;
8 using System;
9 using System.Collections;
10 using System.Collections.Generic;
11 using System.Globalization;
12 using System.IO;
13 using System.Linq;
14 using System.Runtime.CompilerServices;
15 using System. Text ;
16 using System. Text .RegularExpressions;
17 using System.Xml;
18 namespace Microsoft.SqlServer.Management.Dac.UI
19 {
20 internal class InternalUIHooks
21 {
22 private static class DifferencerTestUtils
23 {
24 private class DacUtils
25 {
26 public class MetadataObjectComparer : IComparer IMetadataObject >
27 {
28 public static InternalUIHooks.DifferencerTestUtils.DacUtils.MetadataObjectComparer Instance = new InternalUIHooks.DifferencerTestUtils.DacUtils.MetadataObjectComparer();
29 public int Compare(IMetadataObject x, IMetadataObject y)
30 {
31 if (object.ReferenceEquals(x, y))
32 {
33 return 0 ;
34 }
35 if (x == null )
36 {
37 return - 1 ;
38 }
39 if (y == null )
40 {
41 return 1 ;
42 }
43 IList IMetadataObject > hierarchy = InternalUIHooks.DifferencerTestUtils.DacUtils.MetadataObjectComparer.GetHierarchy(x);
44 IList IMetadataObject > hierarchy2 = InternalUIHooks.DifferencerTestUtils.DacUtils.MetadataObjectComparer.GetHierarchy(y);
45 int num = 0 ;
46 while (num hierarchy. Count || num hierarchy2. Count )
47 {
48 if (num >= hierarchy. Count )
49 {
50 return - 1 ;
51 }
52 if (num >= hierarchy2. Count )
53 {
54 return 1 ;
55 }
56 int num2 = hierarchy [ num ] .TypeInfo().CompareTo(hierarchy2 [ num ] .TypeInfo());
57 if (num2 != 0 )
58 {
59 return num2;
60 }
61 int num3 = StringComparer.Ordinal.Compare(hierarchy [ num ] .Name, hierarchy2 [ num ] .Name);
62 if (num3 != 0 )
63 {
64 return num3;
65 }
66 num ++ ;
67 }
68 return 0 ;
69 }
70 private static IList IMetadataObject > GetHierarchy(IMetadataObject obj)
71 {
72 List IMetadataObject > list = new List IMetadataObject > ();
73 for (IMetadataObject metadataObject = obj; metadataObject != null ; metadataObject = InternalUIHooks.DifferencerTestUtils.DacUtils.GetParentObjectSafe(metadataObject))
74 {
75 list. Add (metadataObject);
76 }
77 list. Reverse ();
78 return list;
79 }
80 }
81 internal static DacType CreateDacFromSql(string sql)
82 {
83 return InternalUIHooks.DifferencerTestUtils.DacUtils.CreateDacFromSql(sql, new Version(" 1.1 . 1.1 "), string.Empty);
84 }
85 internal static DacType CreateDacFromSql(string sql, Version version, string description)
86 {
87 DacCompilationUnit dacCompilationUnit = new DacCompilationUnit("Dac", version, "SQL_Latin1_General_CP1_CI_AS");
88 dacCompilationUnit.Description = description;
89 dacCompilationUnit.AddTSqlSourceFile("input.sql", sql);
90 DacCompilationResult dacCompilationResult = dacCompilationUnit.Compile();
91 List DacCompilationError > list = new List DacCompilationError > (dacCompilationResult.Errors);
92 if (list. Count != 0 )
93 {
94 InternalUIHooks.DifferencerTestUtils.DacUtils.PrintCompilationResultErrors(dacCompilationResult);
95 }
96 return InternalUIHooks.DifferencerTestUtils.DacUtils.NormalizeDacType(dacCompilationResult.DacType);
97 }
98 private static DacType NormalizeDacType(DacType dacType)
99 {
100 DacType result;
101 using (MemoryStream memoryStream = new MemoryStream())
102 {
103 DacType. Save (dacType, memoryStream);
104 memoryStream.Seek(0L, SeekOrigin. Begin );
105 result = DacType. Load (memoryStream);
106 }
107 return result;
108 }
109 private static void PrintCompilationResultErrors(DacCompilationResult result)
110 {
111 List DacCompilationError > list = new List DacCompilationError > (result.Errors);
112 Console.WriteLine("Compilation Result Errors (" + list. Count + ")");
113 foreach (DacCompilationError current in list)
114 {
115 Console.WriteLine("\t - { 0 }{ 1 }: " + current .ToString(), current .IsWarning ? "Warning" : "Error", ( current .SourceInfo != null ) ? (" " + InternalUIHooks.DifferencerTestUtils.DacUtils.GetLocationString( current .SourceInfo)) : "");
116 }
117 Console.WriteLine();
118 }
119 private static string GetLocationString(SourceInfo sourceInfo)
120 {
121 return string.Concat(new object []
122 {
123 sourceInfo.Filename,
124 ":",
125 sourceInfo.Start.LineNumber,
126 ",",
127 sourceInfo.Start.ColumnNumber
128 });
129 }
130 public static DacType CreateDacFromFile(string fileName)
131 {
132 string sql = File .ReadAllText(fileName);
133 return InternalUIHooks.DifferencerTestUtils.DacUtils.CreateDacFromSql(sql);
134 }
135 public static DacType CreateDacFromFile(string fileName, Version version, string description)
136 {
137 string sql = File .ReadAllText(fileName);
138 return InternalUIHooks.DifferencerTestUtils.DacUtils.CreateDacFromSql(sql, version, description);
139 }
140 public static string GetMetadataObjectIdString(IMetadataObject obj)
141 {
142 List string > list = new List string > ();
143 IMetadataObject metadataObject = obj;
144 while (true)
145 {
146 TypeInfo typeInfo = metadataObject.TypeInfo();
147 string text = typeInfo.Name. Substring ( 1 );
148 string item = string.Format(CultureInfo.InvariantCulture, "{ 0 }{ 1 }", new object []
149 {
150 text ,
151 (!(metadataObject is IServer)) ? (" [ " + metadataObject.Name.Replace(" ] ", "]]") + "]") : string.Empty
152 });
153 list. Add (item);
154 if (metadataObject is IServer)
155 {
156 break ;
157 }
158 metadataObject = InternalUIHooks.DifferencerTestUtils.DacUtils.GetParentObject(metadataObject);
159 }
160 list. Reverse ();
161 return string. Join (" / ", list.ToArray());
162 }
163 public static string GetMetadataObjectTypeString(IMetadataObject obj)
164 {
165 return obj.TypeInfo().Name. Substring ( 1 );
166 }
167 public static IMetadataObject GetParentObject(IMetadataObject obj)
168 {
169 MetadataTypeInfo metadataTypeInfo = obj.TypeInfo();
170 MetadataPropertyInfo parentProperty = metadataTypeInfo.ParentProperty;
171 object propertyValue = MetadataUtils.GetPropertyValue(obj, metadataTypeInfo, parentProperty);
172 return (IMetadataObject)propertyValue;
173 }
174 public static IMetadataObject GetParentObjectSafe(IMetadataObject obj)
175 {
176 MetadataTypeInfo metadataTypeInfo = obj.TypeInfo();
177 MetadataPropertyInfo parentProperty = metadataTypeInfo.ParentProperty;
178 if (parentProperty == null )
179 {
180 return null ;
181 }
182 object propertyValue = MetadataUtils.GetPropertyValue(obj, metadataTypeInfo, parentProperty);
183 return (IMetadataObject)propertyValue;
184 }
185 public static void WriteObject(XmlWriter writer, object value, bool writeDefinition)
186 {
187 Type type = (value != null ) ? value.GetType() : null ;
188 if (value == null )
189 {
190 writer.WriteAttributeString(" isNull ", true.ToString());
191 return ;
192 }
193 if (type.IsPrimitive || type.IsEnum || type == typeof(string))
194 {
195 writer.WriteString(value.ToString());
196 return ;
197 }
198 if (type == typeof(IdentityColumnInfo))
199 {
200 writer.WriteStartElement("Increment");
201 InternalUIHooks.DifferencerTestUtils.DacUtils.WriteObject(writer, ((IdentityColumnInfo)value).Increment, true);
202 writer.WriteEndElement();
203 writer.WriteStartElement("Seed");
204 InternalUIHooks.DifferencerTestUtils.DacUtils.WriteObject(writer, ((IdentityColumnInfo)value).Seed, true);
205 writer.WriteEndElement();
206 return ;
207 }
208 if (type == typeof(ComputedColumnInfo))
209 {
210 writer.WriteStartElement("IsPersisted");
211 InternalUIHooks.DifferencerTestUtils.DacUtils.WriteObject(writer, ((ComputedColumnInfo)value).IsPersisted, true);
212 writer.WriteEndElement();
213 writer.WriteStartElement(" Text ");
214 InternalUIHooks.DifferencerTestUtils.DacUtils.WriteObject(writer, ((ComputedColumnInfo)value). Text , true);
215 writer.WriteEndElement();
216 return ;
217 }
218 if (type == typeof(DataTypeSpec))
219 {
220 writer.WriteString(((DataTypeSpec)value).SqlDataType.ToString());
221 return ;
222 }
223 if (type == typeof(CollationInfo))
224 {
225 writer.WriteStartElement("CollationInfo");
226 InternalUIHooks.DifferencerTestUtils.DacUtils.WriteObject(writer, ((CollationInfo)value).Name, true);
227 writer.WriteEndElement();
228 return ;
229 }
230 if (value is ISystemClrDataType)
231 {
232 writer.WriteStartElement("ISystemClrDataType");
233 InternalUIHooks.DifferencerTestUtils.DacUtils.WriteObject(writer, ((ISystemClrDataType)value).Name, true);
234 writer.WriteEndElement();
235 return ;
236 }
237 if (value is IMetadataObject)
238 {
239 IMetadataObject obj = (IMetadataObject)value;
240 MetadataTypeInfo metadataTypeInfo = obj.TypeInfo();
241 if (metadataTypeInfo.IsValue || (metadataTypeInfo.IsReference && writeDefinition))
242 {
243 writer.WriteStartElement(InternalUIHooks.DifferencerTestUtils.DacUtils.GetMetadataObjectTypeString(obj));
244 foreach (MetadataPropertyInfo current in metadataTypeInfo.InstanceProperties)
245 {
246 object propertyValue = MetadataUtils.GetPropertyValue(obj, metadataTypeInfo, current );
247 writer.WriteStartElement( current .Name);
248 InternalUIHooks.DifferencerTestUtils.DacUtils.WriteObject(writer, propertyValue, writeDefinition && current .PropertyType == PropertyType.Child);
249 writer.WriteEndElement();
250 }
251 writer.WriteEndElement();
252 return ;
253 }
254 if (metadataTypeInfo.IsReference)
255 {
256 writer.WriteAttributeString("id", InternalUIHooks.DifferencerTestUtils.DacUtils.GetMetadataObjectIdString(obj));
257 return ;
258 }
259 }
260 else
261 {
262 if (value is IEnumerable)
263 {
264 foreach (object current2 in (IEnumerable)value)
265 {
266 string localName = (current2 is IMetadataObject) ? InternalUIHooks.DifferencerTestUtils.DacUtils.GetMetadataObjectTypeString((IMetadataObject)current2) : "Item";
267 writer.WriteStartElement(localName);
268 InternalUIHooks.DifferencerTestUtils.DacUtils.WriteObject(writer, current2, writeDefinition);
269 writer.WriteEndElement();
270 }
271 }
272 }
273 }
274 }
275 public static void WriteChangeResult(XmlWriter writer, ChangeResult changeResult)
276 {
277 writer.WriteStartElement("ChangeResult");
278 writer.WriteStartElement("CreatedObjects");
279 InternalUIHooks.DifferencerTestUtils.WriteObjectRefs(writer, changeResult.CreatedObjects);
280 writer.WriteEndElement();
281 writer.WriteStartElement("DeletedObjects");
282 InternalUIHooks.DifferencerTestUtils.WriteObjectRefs(writer, changeResult.DeletedObjects);
283 writer.WriteEndElement();
284 writer.WriteStartElement("ModifiedObjects");
285 InternalUIHooks.DifferencerTestUtils.WriteModifiedObjects(writer, changeResult.SourceModifiedObjects. Values );
286 writer.WriteEndElement();
287 writer.WriteEndElement();
288 }
289 public static void WriteModifiedObjects(XmlWriter writer, IEnumerable ObjectDifference > objectDifferenceCollection)
290 {
291 List ObjectDifference > list = objectDifferenceCollection.ToList ObjectDifference > ();
292 list.Sort((ObjectDifference x, ObjectDifference y) => InternalUIHooks.DifferencerTestUtils.DacUtils.MetadataObjectComparer.Instance.Compare(x.ChangedObjectSource, y.ChangedObjectSource) * 2 + InternalUIHooks.DifferencerTestUtils.DacUtils.MetadataObjectComparer.Instance.Compare(x.ChangedObjectTarget, y.ChangedObjectTarget));
293 list.ForEach(delegate(ObjectDifference diff)
294 {
295 InternalUIHooks.DifferencerTestUtils.WriteObjectDifference(writer, diff);
296 }
297 );
298 }
299 public static void WriteObjectDifference(XmlWriter writer, ObjectDifference objectDifference)
300 {
301 writer.WriteStartElement(InternalUIHooks.DifferencerTestUtils.DacUtils.GetMetadataObjectTypeString(objectDifference.ChangedObjectSource));
302 writer.WriteStartElement("ChangedObjectSource");
303 writer.WriteAttributeString("Id", InternalUIHooks.DifferencerTestUtils.DacUtils.GetMetadataObjectIdString(objectDifference.ChangedObjectSource));
304 writer.WriteEndElement();
305 writer.WriteStartElement("ChangedObjectTarget");
306 writer.WriteAttributeString("Id", InternalUIHooks.DifferencerTestUtils.DacUtils.GetMetadataObjectIdString(objectDifference.ChangedObjectTarget));
307 writer.WriteEndElement();
308 writer.WriteStartElement("Properties");
309 List PropertyDifference > list = (
310 from p in objectDifference.PropertyDifferences. Values
311 orderby p.Name
312 select p).ToList PropertyDifference > ();
313 list.ForEach(delegate(PropertyDifference p)
314 {
315 InternalUIHooks.DifferencerTestUtils.WritePropertyDifference(writer, p);
316 }
317 );
318 writer.WriteEndElement();
319 writer.WriteEndElement();
320 }
321 public static void WritePropertyDifference(XmlWriter writer, PropertyDifference propertyDifference)
322 {
323 writer.WriteStartElement(propertyDifference.Name);
324 if (propertyDifference is OrderedCollectionDifference)
325 {
326 OrderedCollectionDifference orderedCollectionDifference = propertyDifference as OrderedCollectionDifference;
327 using (IEnumerator OrderedScalarDifference > enumerator = orderedCollectionDifference.OrderDifferences.GetEnumerator())
328 {
329 while (enumerator.MoveNext())
330 {
331 OrderedScalarDifference current = enumerator. Current ;
332 writer.WriteStartElement(InternalUIHooks.DifferencerTestUtils.DacUtils.GetMetadataObjectTypeString((IMetadataObject) current .SourceValue));
333 writer.WriteAttributeString("sourceIndex", current .SourceIndex.ToString(CultureInfo.InvariantCulture));
334 writer.WriteAttributeString("targetIndex", current .TargetIndex.ToString(CultureInfo.InvariantCulture));
335 writer.WriteStartElement("SourceValue");
336 InternalUIHooks.DifferencerTestUtils.DacUtils.WriteObject(writer, current .SourceValue, false);
337 writer.WriteEndElement();
338 writer.WriteStartElement("TargetValue");
339 InternalUIHooks.DifferencerTestUtils.DacUtils.WriteObject(writer, current .TargetValue, false);
340 writer.WriteEndElement();
341 writer.WriteEndElement();
342 }
343 goto IL_12E;
344 }
345 }
346 if (propertyDifference is ScalarDifference)
347 {
348 ScalarDifference scalarDifference = propertyDifference as ScalarDifference;
349 writer.WriteStartElement("SourceValue");
350 InternalUIHooks.DifferencerTestUtils.DacUtils.WriteObject(writer, scalarDifference.SourceValue, false);
351 writer.WriteEndElement();
352 writer.WriteStartElement("TargetValue");
353 InternalUIHooks.DifferencerTestUtils.DacUtils.WriteObject(writer, scalarDifference.TargetValue, false);
354 writer.WriteEndElement();
355 }
356 IL_12E:
357 writer.WriteEndElement();
358 }
359 public static void WriteObjectRefs(XmlWriter writer, IEnumerable IMetadataObject > objectCollection)
360 {
361 List IMetadataObject > list = objectCollection.ToList IMetadataObject > ();
362 list.Sort(InternalUIHooks.DifferencerTestUtils.DacUtils.MetadataObjectComparer.Instance);
363 foreach (IMetadataObject current in list)
364 {
365 writer.WriteStartElement(InternalUIHooks.DifferencerTestUtils.DacUtils.GetMetadataObjectTypeString( current ));
366 InternalUIHooks.DifferencerTestUtils.DacUtils.WriteObject(writer, current , false);
367 writer.WriteEndElement();
368 }
369 }
370 public static bool IsChangeResultDrift(ChangeResult changeResult)
371 {
372 bool flag = changeResult.CreatedObjects. Count IMetadataObject > () != 0 || changeResult.DeletedObjects. Count IMetadataObject > () != 0 ;
373 foreach (ObjectDifference current in changeResult.SourceModifiedObjects. Values )
374 {
375 flag = (!( current .ChangedObjectSource is IConstraint) || (flag | InternalUIHooks.DifferencerTestUtils.IsConstraintDifferenceDrift( current )));
376 }
377 return flag;
378 }
379 private static bool IsConstraintDifferenceDrift(ObjectDifference objectDifference)
380 {
381 bool result = false;
382 foreach (PropertyDifference current in objectDifference.PropertyDifferences. Values )
383 {
384 if ( current .Name == "IsChecked")
385 {
386 if (!InternalUIHooks.DifferencerTestUtils.IsNotForReplicationConstraint((IConstraint)objectDifference.ChangedObjectSource) && !InternalUIHooks.DifferencerTestUtils.IsNotForReplicationConstraint((IConstraint)objectDifference.ChangedObjectTarget))
387 {
388 result = true;
389 }
390 }
391 else
392 {
393 result = true;
394 }
395 }
396 return result;
397 }
398 private static bool IsNotForReplicationConstraint(IConstraint constraint )
399 {
400 bool result;
401 switch ( constraint .Type)
402 {
403 case ConstraintType. Check :
404 {
405 result = ((ICheckConstraint) constraint ).NotForReplication;
406 break ;
407 }
408 case ConstraintType.ForeignKey:
409 {
410 result = ((IForeignKeyConstraint) constraint ).NotForReplication;
411 break ;
412 }
413 case ConstraintType.PrimaryKey:
414 case ConstraintType. Unique :
415 {
416 result = false;
417 break ;
418 }
419 default :
420 {
421 result = false;
422 break ;
423 }
424 }
425 return result;
426 }
427 }
428 public const string DacTypeName = "Dac";
429 public const string DefaultCollation = "SQL_Latin1_General_CP1_CI_AS";
430 public event TextUpdateHandler ScriptUpdate
431 {
432 [ MethodImpl(MethodImplOptions.Synchronized) ]
433 add
434 {
435 this.ScriptUpdate = (TextUpdateHandler)Delegate.Combine(this.ScriptUpdate, value);
436 }
437 [ MethodImpl(MethodImplOptions.Synchronized) ]
438 remove
439 {
440 this.ScriptUpdate = (TextUpdateHandler)Delegate.Remove(this.ScriptUpdate, value);
441 }
442 }
443 public event TextUpdateHandler ModelUpdate
444 {
445 [ MethodImpl(MethodImplOptions.Synchronized) ]
446 add
447 {
448 this.ModelUpdate = (TextUpdateHandler)Delegate.Combine(this.ModelUpdate, value);
449 }
450 [ MethodImpl(MethodImplOptions.Synchronized) ]
451 remove
452 {
453 this.ModelUpdate = (TextUpdateHandler)Delegate.Remove(this.ModelUpdate, value);
454 }
455 }
456 public event TextUpdateHandler ActionUpdate
457 {
458 [ MethodImpl(MethodImplOptions.Synchronized) ]
459 add
460 {
461 this.ActionUpdate = (TextUpdateHandler)Delegate.Combine(this.ActionUpdate, value);
462 }
463 [ MethodImpl(MethodImplOptions.Synchronized) ]
464 remove
465 {
466 this.ActionUpdate = (TextUpdateHandler)Delegate.Remove(this.ActionUpdate, value);
467 }
468 }
469 public DacType CreateDacFromSql(string sql)
470 {
471 return this.CreateDacFromSql(sql, new Version(" 1.1 . 1.1 "), string.Empty);
472 }
473 public DacType CreateDacFromSql(string sql, Version version, string description)
474 {
475 DacCompilationUnit dacCompilationUnit = new DacCompilationUnit("Dac", version, "SQL_Latin1_General_CP1_CI_AS");
476 dacCompilationUnit.Description = description;
477 dacCompilationUnit.AddTSqlSourceFile("input.sql", sql);
478 DacCompilationResult dacCompilationResult = dacCompilationUnit.Compile();
479 List DacCompilationError > list = new List DacCompilationError > (dacCompilationResult.Errors);
480 if (list. Count != 0 )
481 {
482 StringBuilder stringBuilder = new StringBuilder();
483 stringBuilder.Append(" *** COMPILE ERROR *** ");
484 stringBuilder.Append(Environment.NewLine);
485 foreach (DacCompilationError current in list)
486 {
487 stringBuilder.Append( current .Message);
488 stringBuilder.Append(Environment.NewLine);
489 }
490 this.OnScriptUpdate(stringBuilder.ToString());
491 return null ;
492 }
493 return this.NormalizeDacType(dacCompilationResult.DacType);
494 }
495 public void CompareSQLScripts(string sourceSQL, string targetSQL, bool isAzure)
496 {
497 this.OnActionUpdate("Building Source SQL DAC");
498 DacType dacType = this.CreateDacFromSql(sourceSQL, new Version(" 1.1 . 1.1 "), "V1");
499 this.OnActionUpdate("Building Target SQL DAC");
500 DacType dacType2 = this.CreateDacFromSql(targetSQL, new Version(" 2.2 . 2.2 "), "V2");
501 this.OnActionUpdate("Preparing Incremental Upgrade Script");
502 PrepareIncrementalUpgradeScriptStep prepareIncrementalUpgradeScriptStep = new PrepareIncrementalUpgradeScriptStep(dacType.Definition, "Dac", dacType2.Definition, "Dac", this.GetDefaultDifferencerFilter(), isAzure ? ScriptTarget.SqlAzure : ScriptTarget.Sql100, false);
503 prepareIncrementalUpgradeScriptStep. Execute ();
504 IEnumerable ActionGroup > incrementalUpgradeActionGroups = prepareIncrementalUpgradeScriptStep.GetIncrementalUpgradeActionGroups();
505 foreach (ActionGroup current in incrementalUpgradeActionGroups)
506 {
507 ActionGroupScripter actionGroupScripter = current .GetActionGroupScripter(ScriptTarget.Sql100);
508 this.OnActionUpdate(actionGroupScripter.Description);
509 }
510 this.OnScriptUpdate(prepareIncrementalUpgradeScriptStep.CompleteScript);
511 this.OnModelUpdate(this.GetChangeResultOutput(dacType.Definition.Databases [ "Dac" ] , dacType2.Definition.Databases [ "Dac" ] ));
512 }
513 public string GetDatabaseScript(ServerConnection serverConnection, string databaseName)
514 {
515 string input = string.Empty;
516 try
517 {
518 IServer offlineDatabase = InternalUIHooks.GetOfflineDatabase(serverConnection, databaseName);
519 PrepareDeploymentScriptStep prepareDeploymentScriptStep = new PrepareDeploymentScriptStep(offlineDatabase, databaseName, new TargetEngineInfo(serverConnection), true);
520 prepareDeploymentScriptStep. Execute ();
521 input = prepareDeploymentScriptStep.CompleteDatabaseObjectsScript;
522 }
523 catch (Exception exception)
524 {
525 InternalUIHooks.ThrowExceptionMessage(exception);
526 }
527 Regex regex = new Regex(" ^ RAISERROR . * \\nGO. * \\n", RegexOptions.Multiline);
528 return regex. Replace (input, Environment.NewLine);
529 }
530 public void Apply(ServerConnection serverConnection, string sql, string databaseName)
531 {
532 Database database = new Server(serverConnection).Databases [ databaseName ] ;
533 try
534 {
535 string text = "Dac";
536 DacStore dacStore = new DacStore(serverConnection);
537 DacDefinition dacDefinition = new DacDefinition(dacStore, text , databaseName);
538 if (!dacDefinition.IsRegistered)
539 {
540 text = "Dac";
541 dacDefinition.Register();
542 }
543 else
544 {
545 text = dacStore.DacInstances [ databaseName ] .Type.Name;
546 }
547 DacCompilationUnit dacCompilationUnit = new DacCompilationUnit( text , new Version( 1 , 0 ), database .Collation);
548 dacCompilationUnit.AddTSqlSourceFile("input.sql", sql);
549 DacCompilationResult dacCompilationResult = dacCompilationUnit.Compile();
550 if (dacCompilationResult.Errors. Count DacCompilationError > () > 0 )
551 {
552 StringBuilder stringBuilder = new StringBuilder();
553 foreach (DacCompilationError current in dacCompilationResult.Errors)
554 {
555 stringBuilder.Append( current .Message);
556 }
557 throw new Exception(stringBuilder.ToString());
558 }
559 DacType dacType = dacCompilationResult.DacType;
560 IServer offlineDatabase = InternalUIHooks.GetOfflineDatabase(serverConnection, databaseName);
561 this.OnModelUpdate(this.GetChangeResultOutput(offlineDatabase.Databases [ databaseName ] , dacType.Definition.Databases [ text ] ));
562 this.OnScriptUpdate(dacStore.GetIncrementalUpgradeScript(databaseName, dacType));
563 dacStore.IncrementalUpgrade(databaseName, dacType, new DacUpgradeOptions());
564 }
565 catch (Exception exception)
566 {
567 InternalUIHooks.ThrowExceptionMessage(exception);
568 }
569 }
570 private string GetChangeResultOutput(IDatabase sourceDatabase, IDatabase targetDatabase)
571 {
572 ChangeResult changeResult = Differencer.Compare(sourceDatabase, targetDatabase, this.GetDefaultDifferencerFilter());
573 StringBuilder stringBuilder = new StringBuilder();
574 using (XmlWriter xmlWriter = XmlWriter. Create (stringBuilder, new XmlWriterSettings
575 {
576 Indent = true,
577 IndentChars = " ",
578 NewLineChars = Environment.NewLine,
579 CloseOutput = false
580 }))
581 {
582 InternalUIHooks.DifferencerTestUtils.WriteChangeResult(xmlWriter, changeResult);
583 }
584 return stringBuilder.ToString();
585 }
586 private static void ThrowExceptionMessage(Exception exception)
587 {
588 StringBuilder stringBuilder = new StringBuilder();
589 while (exception != null )
590 {
591 stringBuilder.AppendLine(" -> " + exception.Message);
592 exception = exception.InnerException;
593 }
594 throw new Exception(string查看更多关于SQLSERVER数据库管理员的专用连接DAC的详细内容...
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