Transaction in Access2003

  1using System;
  2using System.Data.OleDb;
  3using System.Data;
  4using System.Windows.Forms;
  5namespace DBAccess
  6...{
  7    /**//// <summary>
  8    /// 對Access2003數據庫的訪問、數據獲取   9    /// </summary>
10    public  class Access2003
11    ...{
12        static OleDbTransaction myts = null; // 事務
13        static OleDbConnection MyConnection = null; // 數據庫連接
14
15        數據庫打開、關閉#region 數據庫打開、關閉
16        /**//// <summary>
17        /// 打開數據庫
18        /// </summary>
19        public static void Open()
20        ...{
21            MyConnection = new OleDbConnection( GetConnectionStr() );
22            MyConnection.Open();
23        }
24
25        /**//// <summary>
26        /// 關閉數據庫
27        /// </summary>
28        public static void Close()
29        ...{
30            MyConnection.Close();
31        }
32        #endregion
33
34        開始、提交、回滾一個數據庫事務#region 開始、提交、回滾一個數據庫事務
35
36        /**//// <summary>
37        /// 開始一個事務
38        /// </summary>
39        public static void BeginTransaction()
40        ...{
41            myts = MyConnection.BeginTransaction();
42        }
43
44        /**//// <summary>
45        /// 提交一個事務
46        /// </summary>
47        public static void CommitTransaction()
48        ...{
49            if( myts == null )
50            ...{
51                return;
52            }
53            myts.Commit();
54        }
55
56        /**//// <summary>
57        /// 回滾一個事務
58        /// </summary>
59        public static void RollbackTransaction()
60        ...{
61            if( myts == null )
62            ...{
63                return;
64            }
65            myts.Rollback();
66        }
67        #endregion
68
69        獲取數據庫連接字符串#region 獲取數據庫連接字符串
70
71        /**//// <summary>
72        /// 獲取連接字符串
73        /// </summary>s
74        /// <returns>返回一個字符串，代表了連接信息</returns>
75        private static string GetConnectionStr()
76        ...{
77            string str = string.Empty;
78            str = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source="+ Application.StartupPath +"//Library.mdb;";
79            return str;
80        }
81        #endregion
82
83        查找數據#region 查找數據
84
85        /**//// <summary>
86        /// 執行一段SQL語句,查找相關數據
87        /// </summary>
88        /// <param name="sql">要執行的SQL語句</param>
89        /// <returns>一個DataTable實例</returns>
90        public static DataTable GetDataTable( string sql )
91        ...{
92            DataTable dt = new DataTable();
93            OleDbCommand odc = new OleDbCommand( sql, MyConnection );
94            OleDbDataAdapter oda = new OleDbDataAdapter( odc);
95            try
96            ...{
97                MyConnection.Open();
98                oda.Fill( dt );
99                return dt;
100            }
101            catch( Exception e )
102            ...{
103                MessageBox.Show( "出錯，原因是：" + e.Message, "出錯" );
104                return null;
105            }
106            finally
107            ...{
108                MyConnection.Close();
109                odc.Dispose();
110                oda.Dispose();
111            }
112        }
113        #endregion
114
115        執行SQL命令#region 執行SQL命令
116
117        /**//// <summary>
118        /// 執行一段SQL語句
119        /// </summary>
120        /// <param name="sql">要執行的SQL語句</param>
121        public static int DoCommand( string sql )
122        ...{
123            OleDbCommand odc = new OleDbCommand( sql, MyConnection );
124            try
125            ...{
126                odc.Transaction = myts;
127                odc.ExecuteNonQuery();
128                return 1;
129            }
130            catch( Exception e )
131            ...{
132                throw new Exception( "出錯，原因是：" + e.Message );
133            }
134            finally
135            ...{
136                odc.Dispose();
137            }
138        }
139#endregion
140    }
141}
142