NET-数据访问基础类(基于OleDb)

  1    /**//// <summary>
  2    /// 数据访问基础类(基于OleDb) 
  3    /// Copyright (C) 2004-2008 HOMEZZM
  4    /// </summary>
  5    public abstract class DbHelperOleDb
  6    {
  7        //数据库连接字符串(web.config来配置)，可以动态更改connectionString支持多数据库.        
  8        public static string connectionString = PubConstant.ConnectionString;             
  9        public DbHelperOleDb()
 10        {
 11        }
 12
 13        执行简单SQL语句#region  执行简单SQL语句
 14
 15        /**//// <summary>
 16        /// 执行SQL语句，返回影响的记录数
 17        /// </summary>
 18        /// <param name="SQLString">SQL语句</param>
 19        /// <returns>影响的记录数</returns>
 20        public static int ExecuteSql(string SQLString)
 21        {
 22            using (OleDbConnection connection = new OleDbConnection(connectionString))
 23            {
 24                using (OleDbCommand cmd = new OleDbCommand(SQLString, connection))
 25                {
 26                    try
 27                    {
 28                        connection.Open();
 29                        int rows = cmd.ExecuteNonQuery();
 30                        return rows;
 31                    }
 32                    catch (System.Data.OleDb.OleDbException E)
 33                    {
 34                        connection.Close();
 35                        throw new Exception(E.Message);
 36                    }
 37                }
 38            }
 39        }
 40
 41        /**//// <summary>
 42        /// 执行多条SQL语句，实现数据库事务。
 43        /// </summary>
 44        /// <param name="SQLStringList">多条SQL语句</param>        
 45        public static void ExecuteSqlTran(ArrayList SQLStringList)
 46        {
 47            using (OleDbConnection conn = new OleDbConnection(connectionString))
 48            {
 49                conn.Open();
 50                OleDbCommand cmd = new OleDbCommand();
 51                cmd.Connection = conn;
 52                OleDbTransaction tx = conn.BeginTransaction();
 53                cmd.Transaction = tx;
 54                try
 55                {
 56                    for (int n = 0; n < SQLStringList.Count; n++)
 57                    {
 58                        string strsql = SQLStringList[n].ToString();
 59                        if (strsql.Trim().Length > 1)
 60                        {
 61                            cmd.CommandText = strsql;
 62                            cmd.ExecuteNonQuery();
 63                        }
 64                    }
 65                    tx.Commit();
 66                }
 67                catch (System.Data.OleDb.OleDbException E)
 68                {
 69                    tx.Rollback();
 70                    throw new Exception(E.Message);
 71                }
 72            }
 73        }
 74        /**//// <summary>
 75        /// 执行带一个存储过程参数的的SQL语句。
 76        /// </summary>
 77        /// <param name="SQLString">SQL语句</param>
 78        /// <param name="content">参数内容,比如一个字段是格式复杂的文章，有特殊符号，可以通过这个方式添加</param>
 79        /// <returns>影响的记录数</returns>
 80        public static int ExecuteSql(string SQLString, string content)
 81        {
 82            using (OleDbConnection connection = new OleDbConnection(connectionString))
 83            {
 84                OleDbCommand cmd = new OleDbCommand(SQLString, connection);
 85                System.Data.OleDb.OleDbParameter myParameter = new System.Data.OleDb.OleDbParameter("@content", OleDbType.VarChar);
 86                myParameter.Value = content;
 87                cmd.Parameters.Add(myParameter);
 88                try
 89                {
 90                    connection.Open();
 91                    int rows = cmd.ExecuteNonQuery();
 92                    return rows;
 93                }
 94                catch (System.Data.OleDb.OleDbException E)
 95                {
 96                    throw new Exception(E.Message);
 97                }
 98                finally
 99                {
100                    cmd.Dispose();
101                    connection.Close();
102                }
103            }
104        }
105        /**//// <summary>
106        /// 向数据库里插入图像格式的字段(和上面情况类似的另一种实例)
107        /// </summary>
108        /// <param name="strSQL">SQL语句</param>
109        /// <param name="fs">图像字节,数据库的字段类型为image的情况</param>
110        /// <returns>影响的记录数</returns>
111        public static int ExecuteSqlInsertImg(string strSQL, byte[] fs)
112        {
113            using (OleDbConnection connection = new OleDbConnection(connectionString))
114            {
115                OleDbCommand cmd = new OleDbCommand(strSQL, connection);
116                System.Data.OleDb.OleDbParameter myParameter = new System.Data.OleDb.OleDbParameter("@fs", OleDbType.Binary);
117                myParameter.Value = fs;
118                cmd.Parameters.Add(myParameter);
119                try
120                {
121                    connection.Open();
122                    int rows = cmd.ExecuteNonQuery();
123                    return rows;
124                }
125                catch (System.Data.OleDb.OleDbException E)
126                {
127                    throw new Exception(E.Message);
128                }
129                finally
130                {
131                    cmd.Dispose();
132                    connection.Close();
133                }
134            }
135        }
136
137        /**//// <summary>
138        /// 执行一条计算查询结果语句，返回查询结果（object）。
139        /// </summary>
140        /// <param name="SQLString">计算查询结果语句</param>
141        /// <returns>查询结果（object）</returns>
142        public static object GetSingle(string SQLString)
143        {
144            using (OleDbConnection connection = new OleDbConnection(connectionString))
145            {
146                using (OleDbCommand cmd = new OleDbCommand(SQLString, connection))
147                {
148                    try
149                    {
150                        connection.Open();
151                        object obj = cmd.ExecuteScalar();
152                        if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))
153                        {
154                            return null;
155                        }
156                        else
157                        {
158                            return obj;
159                        }
160                    }
161                    catch (System.Data.OleDb.OleDbException e)
162                    {
163                        connection.Close();
164                        throw new Exception(e.Message);
165                    }
166                }
167            }
168        }
169        /**//// <summary>
170        /// 执行查询语句，返回OleDbDataReader
171        /// </summary>
172        /// <param name="strSQL">查询语句</param>
173        /// <returns>OleDbDataReader</returns>
174        public static OleDbDataReader ExecuteReader(string strSQL)
175        {
176            OleDbConnection connection = new OleDbConnection(connectionString);
177            OleDbCommand cmd = new OleDbCommand(strSQL, connection);
178            try
179            {
180                connection.Open();
181                OleDbDataReader myReader = cmd.ExecuteReader();
182                return myReader;
183            }
184            catch (System.Data.OleDb.OleDbException e)
185            {
186                throw new Exception(e.Message);
187            }
188
189        }
190        /**//// <summary>
191        /// 执行查询语句，返回DataSet
192        /// </summary>
193        /// <param name="SQLString">查询语句</param>
194        /// <returns>DataSet</returns>
195        public static DataSet Query(string SQLString)
196        {
197            using (OleDbConnection connection = new OleDbConnection(connectionString))
198            {
199                DataSet ds = new DataSet();
200                try
201                {
202                    connection.Open();
203                    OleDbDataAdapter command = new OleDbDataAdapter(SQLString, connection);
204                    command.Fill(ds, "ds");
205                }
206                catch (System.Data.OleDb.OleDbException ex)
207                {
208                    throw new Exception(ex.Message);
209                }
210                return ds;
211            }
212        }
213
214
215        #endregion
216
217        执行带参数的SQL语句#region 执行带参数的SQL语句
218
219        /**//// <summary>
220        /// 执行SQL语句，返回影响的记录数
221        /// </summary>
222        /// <param name="SQLString">SQL语句</param>
223        /// <returns>影响的记录数</returns>
224        public static int ExecuteSql(string SQLString, params OleDbParameter[] cmdParms)
225        {
226            using (OleDbConnection connection = new OleDbConnection(connectionString))
227            {
228                using (OleDbCommand cmd = new OleDbCommand())
229                {
230                    try
231                    {
232                        PrepareCommand(cmd, connection, null, SQLString, cmdParms);
233                        int rows = cmd.ExecuteNonQuery();
234                        cmd.Parameters.Clear();
235                        return rows;
236                    }
237                    catch (System.Data.OleDb.OleDbException E)
238                    {
239                        throw new Exception(E.Message);
240                    }
241                }
242            }
243        }
244
245
246        /**//// <summary>
247        /// 执行多条SQL语句，实现数据库事务。
248        /// </summary>
249        /// <param name="SQLStringList">SQL语句的哈希表（key为sql语句，value是该语句的OleDbParameter[]）</param>
250        public static void ExecuteSqlTran(Hashtable SQLStringList)
251        {
252            using (OleDbConnection conn = new OleDbConnection(connectionString))
253            {
254                conn.Open();
255                using (OleDbTransaction trans = conn.BeginTransaction())
256                {
257                    OleDbCommand cmd = new OleDbCommand();
258                    try
259                    {
260                        //循环
261                        foreach (DictionaryEntry myDE in SQLStringList)
262                        {
263                            string cmdText = myDE.Key.ToString();
264                            OleDbParameter[] cmdParms = (OleDbParameter[])myDE.Value;
265                            PrepareCommand(cmd, conn, trans, cmdText, cmdParms);
266                            int val = cmd.ExecuteNonQuery();
267                            cmd.Parameters.Clear();
268
269                            trans.Commit();
270                        }
271                    }
272                    catch
273                    {
274                        trans.Rollback();
275                        throw;
276                    }
277                }
278            }
279        }
280
281
282        /**//// <summary>
283        /// 执行一条计算查询结果语句，返回查询结果（object）。
284        /// </summary>
285        /// <param name="SQLString">计算查询结果语句</param>
286        /// <returns>查询结果（object）</returns>
287        public static object GetSingle(string SQLString, params OleDbParameter[] cmdParms)
288        {
289            using (OleDbConnection connection = new OleDbConnection(connectionString))
290            {
291                using (OleDbCommand cmd = new OleDbCommand())
292                {
293                    try
294                    {
295                        PrepareCommand(cmd, connection, null, SQLString, cmdParms);
296                        object obj = cmd.ExecuteScalar();
297                        cmd.Parameters.Clear();
298                        if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))
299                        {
300                            return null;
301                        }
302                        else
303                        {
304                            return obj;
305                        }
306                    }
307                    catch (System.Data.OleDb.OleDbException e)
308                    {
309                        throw new Exception(e.Message);
310                    }
311                }
312            }
313        }
314
315        /**//// <summary>
316        /// 执行查询语句，返回OleDbDataReader
317        /// </summary>
318        /// <param name="strSQL">查询语句</param>
319        /// <returns>OleDbDataReader</returns>
320        public static OleDbDataReader ExecuteReader(string SQLString, params OleDbParameter[] cmdParms)
321        {
322            OleDbConnection connection = new OleDbConnection(connectionString);
323            OleDbCommand cmd = new OleDbCommand();
324            try
325            {
326                PrepareCommand(cmd, connection, null, SQLString, cmdParms);
327                OleDbDataReader myReader = cmd.ExecuteReader();
328                cmd.Parameters.Clear();
329                return myReader;
330            }
331            catch (System.Data.OleDb.OleDbException e)
332            {
333                throw new Exception(e.Message);
334            }
335
336        }
337
338        /**//// <summary>
339        /// 执行查询语句，返回DataSet
340        /// </summary>
341        /// <param name="SQLString">查询语句</param>
342        /// <returns>DataSet</returns>
343        public static DataSet Query(string SQLString, params OleDbParameter[] cmdParms)
344        {
345            using (OleDbConnection connection = new OleDbConnection(connectionString))
346            {
347                OleDbCommand cmd = new OleDbCommand();
348                PrepareCommand(cmd, connection, null, SQLString, cmdParms);
349                using (OleDbDataAdapter da = new OleDbDataAdapter(cmd))
350                {
351                    DataSet ds = new DataSet();
352                    try
353                    {
354                        da.Fill(ds, "ds");
355                        cmd.Parameters.Clear();
356                    }
357                    catch (System.Data.OleDb.OleDbException ex)
358                    {
359                        throw new Exception(ex.Message);
360                    }
361                    return ds;
362                }
363            }
364        }
365
366
367        private static void PrepareCommand(OleDbCommand cmd, OleDbConnection conn, OleDbTransaction trans, string cmdText, OleDbParameter[] cmdParms)
368        {
369            if (conn.State != ConnectionState.Open)
370                conn.Open();
371            cmd.Connection = conn;
372            cmd.CommandText = cmdText;
373            if (trans != null)
374                cmd.Transaction = trans;
375            cmd.CommandType = CommandType.Text;//cmdType;
376            if (cmdParms != null)
377            {
378                foreach (OleDbParameter parm in cmdParms)
379                    cmd.Parameters.Add(parm);
380            }
381        }
382
383        #endregion
384
385    
386
387    }