【转】通用数据访问层--Access版

1. using System;
2. using System.Data;
3. using System.Configuration;
4. using System.Web;
5. 
   
6. using System.Data.OleDb;
7. 
   
8. 
   
9. namespace GetDBMo{
10.     class GetDbMo
11.     {
12.         protected static OleDbConnection conn = new OleDbConnection();
13.         protected static OleDbCommand comm = new OleDbCommand();
14.         private static void openConnection()
15.         {
16.             if (conn.State == ConnectionState.Closed)
17.             {
18.                 conn.ConnectionString = @"Provider=Microsoft.Jet.OleDb.4.0;Data Source="+Settings.Default.DbPath ;//web.config文件里设定。
19.                 comm.Connection = conn;
20.                 try
21.                 {
22.                     conn.Open();
23.                 }
24.                 catch (Exception e)
25.                 { throw new Exception(e.Message); }
26. 
    
27.             }
28. 
    
29.         }//打开数据库
30. 
    
31.         private static void closeConnection()
32.         {
33.             if (conn.State == ConnectionState.Open)
34.             {
35.                 conn.Close();
36.                 conn.Dispose();
37.                 comm.Dispose();
38.             }
39.         }//关闭数据库
40. 
    
41.         public static void excuteSql(string sqlstr)
42.         {
43.             try
44.             {
45.                 openConnection();
46.                 comm.CommandType = CommandType.Text;
47.                 comm.CommandText = sqlstr;
48.                 comm.ExecuteNonQuery();
49.             }
50.             catch (Exception e)
51.             {
52.                 throw new Exception(e.Message);
53.             }
54.             finally
55.             { closeConnection(); }
56.         }//执行sql语句
57. 
    
58.         public static OleDbDataReader dataReader(string sqlstr)
59.         {
60.             OleDbDataReader dr = null;
61.             try
62.             {
63.                 openConnection();
64.                 comm.CommandText = sqlstr;
65.                 comm.CommandType = CommandType.Text;
66. 
    
67.                 dr = comm.ExecuteReader(CommandBehavior.CloseConnection);
68.             }
69.             catch
70.             {
71.                 try
72.                 {
73.                     dr.Close();
74.                     closeConnection();
75.                 }
76.                 catch { }
77.             }
78.             return dr;
79.         }//返回指定sql语句的OleDbDataReader对象，使用时请注意关闭这个对象。
80.         public static void dataReader(string sqlstr, ref OleDbDataReader dr)
81.         {
82.             try
83.             {
84.                 openConnection();
85.                 comm.CommandText = sqlstr;
86.                 comm.CommandType = CommandType.Text;
87.                 dr = comm.ExecuteReader(CommandBehavior.CloseConnection);
88.             }
89.             catch
90.             {
91.                 try
92.                 {
93.                     if (dr != null && !dr.IsClosed)
94.                         dr.Close();
95.                 }
96.                 catch
97.                 {
98.                 }
99.                 finally
100.                 {
101.                     closeConnection();
102.                 }
103.             }
104.         }//返回指定sql语句的OleDbDataReader对象,使用时请注意关闭
105. 
     
106.         public static DataSet dataSet(string sqlstr)
107.         {
108.             DataSet ds = new DataSet();
109.             OleDbDataAdapter da = new OleDbDataAdapter();
110.             try
111.             {
112.                 openConnection();
113.                 comm.CommandType = CommandType.Text;
114.                 comm.CommandText = sqlstr;
115.                 da.SelectCommand = comm;
116.                 da.Fill(ds);
117. 
     
118.             }
119.             catch (Exception e)
120.             {
121.                 throw new Exception(e.Message);
122.             }
123.             finally
124.             {
125.                 closeConnection();
126.             }
127.             return ds;
128.         }//返回指定sql语句的dataset
129. 
     
130.         public static void dataSet(string sqlstr, ref DataSet ds)
131.         {
132.             OleDbDataAdapter da = new OleDbDataAdapter();
133.             try
134.             {
135.                 openConnection();
136.                 comm.CommandType = CommandType.Text;
137.                 comm.CommandText = sqlstr;
138.                 da.SelectCommand = comm;
139.                 da.Fill(ds);
140.             }
141.             catch (Exception e)
142.             {
143.                 throw new Exception(e.Message);
144.             }
145.             finally
146.             {
147.                 closeConnection();
148.             }
149.         }//返回指定sql语句的dataset
150. 
     
151.         public static DataTable dataTable(string sqlstr)
152.         {
153.             DataTable dt = new DataTable();
154.             OleDbDataAdapter da = new OleDbDataAdapter();
155.             try
156.             {
157.                 openConnection();
158.                 comm.CommandType = CommandType.Text;
159.                 comm.CommandText = sqlstr;
160.                 da.SelectCommand = comm;
161.                 da.Fill(dt);
162.             }
163.             catch (Exception e)
164.             {
165.                 throw new Exception(e.Message);
166.             }
167.             finally
168.             {
169.                 closeConnection();
170.             }
171.             return dt;
172.         }//返回指定sql语句的datatable
173.         public static void dataTable(string sqlstr, ref DataTable dt)
174.         {
175.             OleDbDataAdapter da = new OleDbDataAdapter();
176.             try
177.             {
178.                 openConnection();
179.                 comm.CommandType = CommandType.Text;
180.                 comm.CommandText = sqlstr;
181.                 da.SelectCommand = comm;
182.                 da.Fill(dt);
183.             }
184.             catch (Exception e)
185.             {
186.                 throw new Exception(e.Message);
187.             }
188.             finally
189.             {
190.                 closeConnection();
191.             }
192.         }//返回指定sql语句的datatable
193. 
     
194.         public static DataView dataView(string sqlstr)
195.         {
196.             OleDbDataAdapter da = new OleDbDataAdapter();
197.             DataView dv = new DataView();
198.             DataSet ds = new DataSet();
199.             try
200.             {
201.                 openConnection();
202.                 comm.CommandType = CommandType.Text;
203.                 comm.CommandText = sqlstr;
204.                 da.SelectCommand = comm;
205.                 da.Fill(ds);
206.                 dv = ds.Tables[0].DefaultView;
207.             }
208.             catch (Exception e)
209.             {
210.                 throw new Exception(e.Message);
211.             }
212.             finally
213.             {
214.                 closeConnection();
215.             }
216.             return dv;
217.         }
218.         //返回指定sql语句的dataview
219. 
     
220.     }
221. }
222.