本文實(shí)例為大家分享了如何利用AOP實(shí)現(xiàn)SqlSugar自動事務(wù)，供大家參考，具體內(nèi)容如下
先看一下效果,帶接口層的三層架構(gòu):
BL層：
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
|
public class StudentBL : IStudentService { private ILogger mLogger; private readonly IStudentDA mStudentDa; private readonly IValueService mValueService; public StudentService(IStudentDA studentDa,IValueService valueService) { mLogger = LogManager.GetCurrentClassLogger(); mStudentDa = studentDa; mValueService = valueService; } [TransactionCallHandler] public IList<Student> GetStudentList(Hashtable paramsHash) { var list = mStudentDa.GetStudents(paramsHash); var value = mValueService.FindAll(); return list; } } |
假設(shè)GetStudentList方法里的mStudentDa.GetStudents和mValueService.FindAll不是查詢操作，而是更新操作，當(dāng)一個失敗另一個需要回滾，就需要在同一個事務(wù)里，當(dāng)一個出現(xiàn)異常就要回滾事務(wù)。
特性TransactionCallHandler就表明當(dāng)前方法需要開啟事務(wù)，并且當(dāng)出現(xiàn)異常的時候回滾事務(wù),方法執(zhí)行完后提交事務(wù)。
DA層：
|
1
2
3
4
5
6
7
8
9
10
11
12
13
|
public class StudentDA : IStudentDA { private SqlSugarClient db; public StudentDA() { db = SugarManager.GetInstance().SqlSugarClient; } public IList<Student> GetStudents(Hashtable paramsHash) { return db.Queryable<Student>().AS("T_Student").With(SqlWith.NoLock).ToList(); } } |
對SqlSugar做一下包裝
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
|
public class SugarManager { private static ConcurrentDictionary<string,SqlClient> _cache = new ConcurrentDictionary<string, SqlClient>(); private static ThreadLocal<string> _threadLocal; private static readonly string _connStr = @"Data Source=localhost;port=3306;Initial Catalog=thy;user id=root;password=xxxxxx;Charset=utf8"; static SugarManager() { _threadLocal = new ThreadLocal<string>(); } private static SqlSugarClient CreatInstance() { SqlSugarClient client = new SqlSugarClient(new ConnectionConfig() { ConnectionString = _connStr, //必填 DbType = DbType.MySql, //必填 IsAutoCloseConnection = true, //默認(rèn)false InitKeyType = InitKeyType.SystemTable }); var key=Guid.NewGuid().ToString().Replace("-", ""); if (!_cache.ContainsKey(key)) { _cache.TryAdd(key,new SqlClient(client)); _threadLocal.Value = key; return client; } throw new Exception("創(chuàng)建SqlSugarClient失敗"); } public static SqlClient GetInstance() { var id= _threadLocal.Value; if (string.IsNullOrEmpty(id)||!_cache.ContainsKey(id)) return new SqlClient(CreatInstance()); return _cache[id]; } public static void Release() { try { var id = GetId(); if (!_cache.ContainsKey(id)) return; Remove(id); } catch (Exception e) { throw e; } } private static bool Remove(string id) { if (!_cache.ContainsKey(id)) return false; SqlClient client; int index = 0; bool result = false; while (!(result = _cache.TryRemove(id, out client))) { index++; Thread.Sleep(20); if (index > 3) break; } return result; } private static string GetId() { var id = _threadLocal.Value; if (string.IsNullOrEmpty(id)) { throw new Exception("內(nèi)部錯誤: SqlSugarClient已丟失."); } return id; } public static void BeginTran() { var instance=GetInstance(); //開啟事務(wù) if (!instance.IsBeginTran) { instance.SqlSugarClient.Ado.BeginTran(); instance.IsBeginTran = true; } } public static void CommitTran() { var id = GetId(); if (!_cache.ContainsKey(id)) throw new Exception("內(nèi)部錯誤: SqlSugarClient已丟失."); if (_cache[id].TranCount == 0) { _cache[id].SqlSugarClient.Ado.CommitTran(); _cache[id].IsBeginTran = false; } } public static void RollbackTran() { var id = GetId(); if (!_cache.ContainsKey(id)) throw new Exception("內(nèi)部錯誤: SqlSugarClient已丟失."); _cache[id].SqlSugarClient.Ado.RollbackTran(); _cache[id].IsBeginTran = false; _cache[id].TranCount = 0; } public static void TranCountAddOne() { var id = GetId(); if (!_cache.ContainsKey(id)) throw new Exception("內(nèi)部錯誤: SqlSugarClient已丟失."); _cache[id].TranCount++; } public static void TranCountMunisOne() { var id = GetId(); if (!_cache.ContainsKey(id)) throw new Exception("內(nèi)部錯誤: SqlSugarClient已丟失."); _cache[id].TranCount--; } } |
_cache保存SqlSugar實(shí)例，_threadLocal確保同一線程下取出的是同一個SqlSugar實(shí)例。
不知道SqlSugar判斷當(dāng)前實(shí)例是否已經(jīng)開啟事務(wù)，所以又將SqlSugar包了一層。
|
1
2
3
4
5
6
7
8
9
10
11
|
public class SqlClient { public SqlSugarClient SqlSugarClient; public bool IsBeginTran = false; public int TranCount = 0; public SqlClient(SqlSugarClient sqlSugarClient) { this.SqlSugarClient = sqlSugarClient; } } |
IsBeginTran標(biāo)識當(dāng)前SqlSugar實(shí)例是否已經(jīng)開啟事務(wù)，TranCount是一個避免事務(wù)嵌套的計(jì)數(shù)器。
一開始的例子
|
1
2
3
4
5
6
7
|
[TransactionCallHandler] public IList<Student> GetStudentList(Hashtable paramsHash) { var list = mStudentDa.GetStudents(paramsHash); var value = mValueService.FindAll(); return list; } |
TransactionCallHandler表明該方法要開啟事務(wù)，但是如果mValueService.FindAll也標(biāo)識了TransactionCallHandler,又要開啟一次事務(wù)？所以用TranCount做一個計(jì)數(shù)。
使用Castle.DynamicProxy
要實(shí)現(xiàn)標(biāo)識了TransactionCallHandler的方法實(shí)現(xiàn)自動事務(wù)，使用Castle.DynamicProxy實(shí)現(xiàn)BL類的代理
Castle.DynamicProxy一般操作
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
|
public class MyClass : IMyClass { public void MyMethod() { Console.WriteLine("My Mehod"); }}public class TestIntercept : IInterceptor { public void Intercept(IInvocation invocation) { Console.WriteLine("before"); invocation.Proceed(); Console.WriteLine("after"); } } var proxyGenerate = new ProxyGenerator(); TestIntercept t=new TestIntercept(); var pg = proxyGenerate.CreateClassProxy<MyClass>(t); pg.MyMethod(); //輸出是 //before //My Mehod //after |
before就是要開啟事務(wù)的地方，after就是提交事務(wù)的地方
最后實(shí)現(xiàn)
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
|
public class TransactionInterceptor : IInterceptor { private readonly ILogger logger; public TransactionInterceptor() { logger = LogManager.GetCurrentClassLogger(); } public void Intercept(IInvocation invocation) { MethodInfo methodInfo = invocation.MethodInvocationTarget; if (methodInfo == null) { methodInfo = invocation.Method; } TransactionCallHandlerAttribute transaction = methodInfo.GetCustomAttributes<TransactionCallHandlerAttribute>(true).FirstOrDefault(); if (transaction != null) { SugarManager.BeginTran(); try { SugarManager.TranCountAddOne(); invocation.Proceed(); SugarManager.TranCountMunisOne(); SugarManager.CommitTran(); } catch (Exception e) { SugarManager.RollbackTran(); logger.Error(e); throw e; } } else { invocation.Proceed(); } } } [AttributeUsage(AttributeTargets.Method, Inherited = true)] public class TransactionCallHandlerAttribute : Attribute { public TransactionCallHandlerAttribute() { } } |
Autofac與Castle.DynamicProxy結(jié)合使用
創(chuàng)建代理的時候一個BL類就要一次操作
|
1
|
proxyGenerate.CreateClassProxy<MyClass>(t); |
而且項(xiàng)目里BL類的實(shí)例化是交給IOC容器控制的，我用的是Autofac。當(dāng)然Autofac和Castle.DynamicProxy是可以結(jié)合使用的
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
|
using System.Reflection;using Autofac;using Autofac.Extras.DynamicProxy;using Module = Autofac.Module;public class BusinessModule : Module { protected override void Load(ContainerBuilder builder) { var business = Assembly.Load("FTY.Business"); builder.RegisterAssemblyTypes(business) .AsImplementedInterfaces().InterceptedBy(typeof(TransactionInterceptor)).EnableInterfaceInterceptors(); builder.RegisterType<TransactionInterceptor>(); } } |
以上就是本文的全部內(nèi)容，希望對大家的學(xué)習(xí)有所幫助，也希望大家多多支持服務(wù)器之家。
原文鏈接：http://www.cnblogs.com/jaycewu/archive/2017/10/25/7733114.html
