代码
1 using System;
2 using System.Collections.Generic;
3 using System.Text;
4 using System.Data;
5 using System.Data.SqlClient;
6 using System.Collections;
7
8 namespace SystemDAO
9 {
10 /// <summary>
11 /// 数据库的通用访问代码
2 using System.Collections.Generic;
3 using System.Text;
4 using System.Data;
5 using System.Data.SqlClient;
6 using System.Collections;
7
8 namespace SystemDAO
9 {
10 /// <summary>
11 /// 数据库的通用访问代码
12 ///
13 /// 此类为抽象类，
14 /// 不允许实例化，在应用时直接调用即可
15 /// </summary>
16 public abstract class SqlHelper
17 {
18 /// <summary>
19 /// 数据库连接字符串
20 /// </summary>
21
22 public static readonly string connectionString = System.Configuration.ConfigurationSettings.AppSettings["con"].ToString().Trim();
23 // Hashtable to store cached parameters
24 private static Hashtable parmCache = Hashtable.Synchronized(new Hashtable());
25
26 #region//ExecteNonQuery方法
27
28 /// <summary>
29 ///执行一个不需要返回值的SqlCommand命令，通过指定专用的连接字符串。
30 /// 使用参数数组形式提供参数列表
31 /// </summary>
32 /// <param name="connectionString">一个有效的数据库连接字符串</param>
33 /// <param name="cmdType">SqlCommand命令类型 (存储过程， T-SQL语句， 等等。)</param>
34 /// <param name="cmdText">存储过程的名字或者 T-SQL 语句</param>
35 /// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param>
36 /// <returns>返回一个数值表示此SqlCommand命令执行后影响的行数</returns>
37 public static int ExecteNonQuery(string connectionString, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
38 {
39 SqlCommand cmd = new SqlCommand();
40 using (SqlConnection conn = new SqlConnection(connectionString))
41 {
42 //通过PrePareCommand方法将参数逐个加入到SqlCommand的参数集合中
43 PrepareCommand(cmd, conn, null, cmdType, cmdText, commandParameters);
44 int val = cmd.ExecuteNonQuery();
45 //清空SqlCommand中的参数列表
46 cmd.Parameters.Clear();
47 return val;
48 }
49 }
50
51 /// <summary>
52 ///执行一个不需要返回值的SqlCommand命令，通过指定专用的连接字符串。
53 /// 使用参数数组形式提供参数列表
54 /// </summary>
55 /// <param name="cmdType">SqlCommand命令类型 (存储过程， T-SQL语句， 等等。)</param>
56 /// <param name="cmdText">存储过程的名字或者 T-SQL 语句</param>
57 /// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param>
58 /// <returns>返回一个数值表示此SqlCommand命令执行后影响的行数</returns>
59 public static int ExecteNonQuery(CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
60 {
61 return ExecteNonQuery(connectionString ,cmdType, cmdText, commandParameters);
62 }
63
64 /// <summary>
65 ///存储过程专用
66 /// </summary>
67 /// <param name="cmdText">存储过程的名字</param>
68 /// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param>
69 /// <returns>返回一个数值表示此SqlCommand命令执行后影响的行数</returns>
70 public static int ExecteNonQueryProducts(string cmdText, params SqlParameter[] commandParameters)
71 {
72 return ExecteNonQuery(CommandType.StoredProcedure, cmdText, commandParameters);
73 }
74
75 /// <summary>
76 ///Sql语句专用
77 /// </summary>
78 /// <param name="cmdText">T_Sql语句</param>
79 /// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param>
80 /// <returns>返回一个数值表示此SqlCommand命令执行后影响的行数</returns>
81 public static int ExecteNonQueryText(string cmdText, params SqlParameter[] commandParameters)
82 {
83 return ExecteNonQuery(CommandType.Text, cmdText, commandParameters);
84 }
85
86 #endregion
87 #region//GetTable方法
88
89 /// <summary>
90 /// 执行一条返回结果集的SqlCommand，通过一个已经存在的数据库连接
91 /// 使用参数数组提供参数
92 /// </summary>
93 /// <param name="connecttionString">一个现有的数据库连接</param>
94 /// <param name="cmdTye">SqlCommand命令类型</param>
95 /// <param name="cmdText">存储过程的名字或者 T-SQL 语句</param>
96 /// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param>
97 /// <returns>返回一个表集合(DataTableCollection)表示查询得到的数据集</returns>
98 public static DataTableCollection GetTable(string connecttionString, CommandType cmdTye, string cmdText, SqlParameter[] commandParameters)
99 {
100 SqlCommand cmd = new SqlCommand();
101 DataSet ds = new DataSet();
102 using (SqlConnection conn = new SqlConnection(connecttionString))
103 {
104 PrepareCommand(cmd, conn, null, cmdTye, cmdText, commandParameters);
105 SqlDataAdapter adapter = new SqlDataAdapter();
106 adapter.SelectCommand = cmd;
107 adapter.Fill(ds);
108 }
109 DataTableCollection table = ds.Tables;
110 return table;
111 }
112
113 /// <summary>
114 /// 执行一条返回结果集的SqlCommand，通过一个已经存在的数据库连接
115 /// 使用参数数组提供参数
116 /// </summary>
117 /// <param name="cmdTye">SqlCommand命令类型</param>
118 /// <param name="cmdText">存储过程的名字或者 T-SQL 语句</param>
119 /// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param>
120 /// <returns>返回一个表集合(DataTableCollection)表示查询得到的数据集</returns>
121 public static DataTableCollection GetTable(CommandType cmdTye, string cmdText, SqlParameter[] commandParameters)
122 {
123 return GetTable(cmdTye, cmdText, commandParameters);
124 }
125
126
127 /// <summary>
128 /// 存储过程专用
129 /// </summary>
130 /// <param name="cmdText">存储过程的名字或者 T-SQL 语句</param>
131 /// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param>
132 /// <returns>返回一个表集合(DataTableCollection)表示查询得到的数据集</returns>
133 public static DataTableCollection GetTableProducts(string cmdText, SqlParameter[] commandParameters)
134 {
135 return GetTable(CommandType.StoredProcedure, cmdText, commandParameters);
136 }
137
138 /// <summary>
139 /// Sql语句专用
140 /// </summary>
141 /// <param name="cmdText"> T-SQL 语句</param>
142 /// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param>
143 /// <returns>返回一个表集合(DataTableCollection)表示查询得到的数据集</returns>
144 public static DataTableCollection GetTableText(string cmdText, SqlParameter[] commandParameters)
145 {
146 return GetTable(CommandType.Text, cmdText, commandParameters);
147 }
148 #endregion
149
150
151 /// <summary>
152 /// 为执行命令准备参数
153 /// </summary>
154 /// <param name="cmd">SqlCommand 命令</param>
155 /// <param name="conn">已经存在的数据库连接</param>
156 /// <param name="trans">数据库事物处理</param>
157 /// <param name="cmdType">SqlCommand命令类型 (存储过程， T-SQL语句， 等等。)</param>
158 /// <param name="cmdText">Command text，T-SQL语句 例如 Select * from Products</param>
159 /// <param name="cmdParms">返回带参数的命令</param>
160 private static void PrepareCommand(SqlCommand cmd, SqlConnection conn, SqlTransaction trans, CommandType cmdType, string cmdText, SqlParameter[] cmdParms)
161 {
162 //判断数据库连接状态
163 if (conn.State != ConnectionState.Open)
164 conn.Open();
165 cmd.Connection = conn;
166 cmd.CommandText = cmdText;
167 //判断是否需要事物处理
168 if (trans != null)
169 cmd.Transaction = trans;
170 cmd.CommandType = cmdType;
171 if (cmdParms != null)
172 {
173 foreach (SqlParameter parm in cmdParms)
174 cmd.Parameters.Add(parm);
175 }
176 }
177
178 /// <summary>
179 /// Execute a SqlCommand that returns a resultset against the database specified in the connection string
180 /// using the provided parameters.
181 /// </summary>
182 /// <param name="connectionString">一个有效的数据库连接字符串</param>
183 /// <param name="cmdType">SqlCommand命令类型 (存储过程， T-SQL语句， 等等。)</param>
184 /// <param name="cmdText">存储过程的名字或者 T-SQL 语句</param>
185 /// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param>
186 /// <returns>A SqlDataReader containing the results</returns>
187 public static SqlDataReader ExecuteReader(string connectionString, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
188 {
189 SqlCommand cmd = new SqlCommand();
190 SqlConnection conn = new SqlConnection(connectionString);
191 // we use a try/catch here because if the method throws an exception we want to
192 // close the connection throw code, because no datareader will exist, hence the
193 // commandBehaviour.CloseConnection will not work
194 try
195 {
196 PrepareCommand(cmd, conn, null, cmdType, cmdText, commandParameters);
197 SqlDataReader rdr = cmd.ExecuteReader(CommandBehavior.CloseConnection);
198 cmd.Parameters.Clear();
199 return rdr;
200 }
201 catch
202 {
203 conn.Close();
204 throw;
205 }
206 }
207 #region//ExecuteDataSet方法
208
209 /// <summary>
210 /// return a dataset
211 /// </summary>
212 /// <param name="connectionString">一个有效的数据库连接字符串</param>
213 /// <param name="cmdType">SqlCommand命令类型 (存储过程， T-SQL语句， 等等。)</param>
214 /// <param name="cmdText">存储过程的名字或者 T-SQL 语句</param>
215 /// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param>
216 /// <returns>return a dataset</returns>
217 public static DataSet ExecuteDataSet(string connectionString, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
218 {
219 SqlConnection conn = new SqlConnection(connectionString);
220 SqlCommand cmd = new SqlCommand();
221 try
222 {
223 PrepareCommand(cmd, conn, null, cmdType, cmdText, commandParameters);
224 SqlDataAdapter da = new SqlDataAdapter();
225 DataSet ds = new DataSet();
226 da.SelectCommand = cmd;
227 da.Fill(ds);
228 return ds;
229 }
230 catch
231 {
232 conn.Close();
233 throw;
234 }
235 }
236
237
238 /// <summary>
239 /// 返回一个DataSet
240 /// </summary>
241 /// <param name="cmdType">SqlCommand命令类型 (存储过程， T-SQL语句， 等等。)</param>
242 /// <param name="cmdText">存储过程的名字或者 T-SQL 语句</param>
243 /// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param>
244 /// <returns>return a dataset</returns>
245 public static DataSet ExecuteDataSet(CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
246 {
247 return ExecuteDataSet(connectionString, cmdType, cmdText, commandParameters);
248 }
249
250 /// <summary>
251 /// 返回一个DataSet
252 /// </summary>
253 /// <param name="cmdText">存储过程的名字</param>
254 /// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param>
255 /// <returns>return a dataset</returns>
256 public static DataSet ExecuteDataSetProducts(string cmdText, params SqlParameter[] commandParameters)
257 {
258 return ExecuteDataSet(connectionString, CommandType.StoredProcedure, cmdText, commandParameters);
259 }
260
261 /// <summary>
262 /// 返回一个DataSet
263 /// </summary>
264
265 /// <param name="cmdText">T-SQL 语句</param>
266 /// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param>
267 /// <returns>return a dataset</returns>
268 public static DataSet ExecuteDataSetText(string cmdText, params SqlParameter[] commandParameters)
269 {
270 return ExecuteDataSet(connectionString, CommandType.Text, cmdText, commandParameters);
271 }
272
273
274 public static DataView ExecuteDataSet(string connectionString, string sortExpression, string direction, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
275 {
276 SqlConnection conn = new SqlConnection(connectionString);
277 SqlCommand cmd = new SqlCommand();
278 try
279 {
280 PrepareCommand(cmd, conn, null, cmdType, cmdText, commandParameters);
281 SqlDataAdapter da = new SqlDataAdapter();
282 DataSet ds = new DataSet();
283 da.SelectCommand = cmd;
284 da.Fill(ds);
285 DataView dv = ds.Tables[0].DefaultView;
286 dv.Sort = sortExpression + " " + direction;
287 return dv;
288 }
289 catch
290 {
291 conn.Close();
292 throw;
293 }
294 }
295 #endregion
296
297
298 #region // ExecuteScalar方法
299
300
301 /// <summary>
302 /// 返回第一行的第一列
303 /// </summary>
304 /// <param name="cmdType">SqlCommand命令类型 (存储过程， T-SQL语句， 等等。)</param>
305 /// <param name="cmdText">存储过程的名字或者 T-SQL 语句</param>
306 /// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param>
307 /// <returns>返回一个对象</returns>
308 public static object ExecuteScalar(CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
309 {
310 return ExecuteScalar(SqlHelper.connectionString, cmdType, cmdText, commandParameters);
311 }
312
313 /// <summary>
314 /// 返回第一行的第一列存储过程专用
315 /// </summary>
316 /// <param name="cmdText">存储过程的名字</param>
317 /// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param>
318 /// <returns>返回一个对象</returns>
319 public static object ExecuteScalarProducts(string cmdText, params SqlParameter[] commandParameters)
320 {
321 return ExecuteScalar(SqlHelper.connectionString, CommandType.StoredProcedure, cmdText, commandParameters);
322 }
323
324 /// <summary>
325 /// 返回第一行的第一列Sql语句专用
326 /// </summary>
327 /// <param name="cmdText">者 T-SQL 语句</param>
328 /// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param>
329 /// <returns>返回一个对象</returns>
330 public static object ExecuteScalarText(string cmdText, params SqlParameter[] commandParameters)
331 {
332 return ExecuteScalar(SqlHelper.connectionString, CommandType.Text, cmdText, commandParameters);
333 }
334
335 /// <summary>
336 /// Execute a SqlCommand that returns the first column of the first record against the database specified in the connection string
337 /// using the provided parameters.
338 /// </summary>
339 /// <remarks>
340 /// e.g.:
341 /// Object obj = ExecuteScalar(connString, CommandType.StoredProcedure, "PublishOrders", new SqlParameter("@prodid", 24));
342 /// </remarks>
343 /// <param name="connectionString">一个有效的数据库连接字符串</param>
344 /// <param name="cmdType">SqlCommand命令类型 (存储过程， T-SQL语句， 等等。)</param>
345 /// <param name="cmdText">存储过程的名字或者 T-SQL 语句</param>
346 /// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param>
347 /// <returns>An object that should be converted to the expected type using Convert.To{Type}</returns>
348 public static object ExecuteScalar(string connectionString, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
349 {
350 SqlCommand cmd = new SqlCommand();
351
352 using (SqlConnection connection = new SqlConnection(connectionString))
353 {
354 PrepareCommand(cmd, connection, null, cmdType, cmdText, commandParameters);
355 object val = cmd.ExecuteScalar();
356 cmd.Parameters.Clear();
357 return val;
358 }
359 }
360
361 /// <summary>
362 /// Execute a SqlCommand that returns the first column of the first record against an existing database connection
363 /// using the provided parameters.
364 /// </summary>
365 /// <remarks>
366 /// e.g.:
367 /// Object obj = ExecuteScalar(connString, CommandType.StoredProcedure, "PublishOrders", new SqlParameter("@prodid", 24));
368 /// </remarks>
369 /// <param name="connectionString">一个有效的数据库连接字符串</param>
370 /// <param name="cmdType">SqlCommand命令类型 (存储过程， T-SQL语句， 等等。)</param>
371 /// <param name="cmdText">存储过程的名字或者 T-SQL 语句</param>
372 /// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param>
373 /// <returns>An object that should be converted to the expected type using Convert.To{Type}</returns>
374 public static object ExecuteScalar(SqlConnection connection, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
375 {
376 SqlCommand cmd = new SqlCommand();
377 PrepareCommand(cmd, connection, null, cmdType, cmdText, commandParameters);
378 object val = cmd.ExecuteScalar();
379 cmd.Parameters.Clear();
380 return val;
381 }
382
383 #endregion
384
385
386 /// <summary>
387 /// add parameter array to the cache
388 /// </summary>
389 /// <param name="cacheKey">Key to the parameter cache</param>
390 /// <param name="cmdParms">an array of SqlParamters to be cached</param>
391 public static void CacheParameters(string cacheKey, params SqlParameter[] commandParameters)
392 {
393 parmCache[cacheKey] = commandParameters;
394 }
395
396 /// <summary>
397 /// Retrieve cached parameters
398 /// </summary>
399 /// <param name="cacheKey">key used to lookup parameters</param>
400 /// <returns>Cached SqlParamters array</returns>
401 public static SqlParameter[] GetCachedParameters(string cacheKey)
402 {
403 SqlParameter[] cachedParms = (SqlParameter[])parmCache[cacheKey];
404 if (cachedParms == null)
405 return null;
406 SqlParameter[] clonedParms = new SqlParameter[cachedParms.Length];
407 for (int i = 0, j = cachedParms.Length; i < j; i++)
408 clonedParms[i] = (SqlParameter)((ICloneable)cachedParms[i]).Clone();
409 return clonedParms;
410 }
411
412
413 /// <summary>
414 /// 检查是否存在
415 /// </summary>
416 /// <param name="strSql">Sql语句</param>
417 /// <returns>bool结果</returns>
418 public static bool Exists(string strSql)
419 {
420 int cmdresult = Convert.ToInt32(ExecuteScalar(connectionString, CommandType.Text, strSql, null));
421 if (cmdresult == 0)
422 {
423 return false;
424 }
425 else
426 {
427 return true;
428 }
429 }
430
431 /// <summary>
432 /// 检查是否存在
433 /// </summary>
434 /// <param name="strSql">Sql语句</param>
435 /// <param name="cmdParms">参数</param>
436 /// <returns>bool结果</returns>
437 public static bool Exists(string strSql, params SqlParameter[] cmdParms)
438 {
439 int cmdresult = Convert.ToInt32(ExecuteScalar(connectionString, CommandType.Text, strSql, cmdParms));
440 if (cmdresult == 0)
441 {
442 return false;
443 }
444 else
445 {
446 return true;
447 }
448 }
449 }
450
451 }
452
453
13 /// 此类为抽象类，
14 /// 不允许实例化，在应用时直接调用即可
15 /// </summary>
16 public abstract class SqlHelper
17 {
18 /// <summary>
19 /// 数据库连接字符串
20 /// </summary>
21
22 public static readonly string connectionString = System.Configuration.ConfigurationSettings.AppSettings["con"].ToString().Trim();
23 // Hashtable to store cached parameters
24 private static Hashtable parmCache = Hashtable.Synchronized(new Hashtable());
25
26 #region//ExecteNonQuery方法
27
28 /// <summary>
29 ///执行一个不需要返回值的SqlCommand命令，通过指定专用的连接字符串。
30 /// 使用参数数组形式提供参数列表
31 /// </summary>
32 /// <param name="connectionString">一个有效的数据库连接字符串</param>
33 /// <param name="cmdType">SqlCommand命令类型 (存储过程， T-SQL语句， 等等。)</param>
34 /// <param name="cmdText">存储过程的名字或者 T-SQL 语句</param>
35 /// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param>
36 /// <returns>返回一个数值表示此SqlCommand命令执行后影响的行数</returns>
37 public static int ExecteNonQuery(string connectionString, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
38 {
39 SqlCommand cmd = new SqlCommand();
40 using (SqlConnection conn = new SqlConnection(connectionString))
41 {
42 //通过PrePareCommand方法将参数逐个加入到SqlCommand的参数集合中
43 PrepareCommand(cmd, conn, null, cmdType, cmdText, commandParameters);
44 int val = cmd.ExecuteNonQuery();
45 //清空SqlCommand中的参数列表
46 cmd.Parameters.Clear();
47 return val;
48 }
49 }
50
51 /// <summary>
52 ///执行一个不需要返回值的SqlCommand命令，通过指定专用的连接字符串。
53 /// 使用参数数组形式提供参数列表
54 /// </summary>
55 /// <param name="cmdType">SqlCommand命令类型 (存储过程， T-SQL语句， 等等。)</param>
56 /// <param name="cmdText">存储过程的名字或者 T-SQL 语句</param>
57 /// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param>
58 /// <returns>返回一个数值表示此SqlCommand命令执行后影响的行数</returns>
59 public static int ExecteNonQuery(CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
60 {
61 return ExecteNonQuery(connectionString ,cmdType, cmdText, commandParameters);
62 }
63
64 /// <summary>
65 ///存储过程专用
66 /// </summary>
67 /// <param name="cmdText">存储过程的名字</param>
68 /// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param>
69 /// <returns>返回一个数值表示此SqlCommand命令执行后影响的行数</returns>
70 public static int ExecteNonQueryProducts(string cmdText, params SqlParameter[] commandParameters)
71 {
72 return ExecteNonQuery(CommandType.StoredProcedure, cmdText, commandParameters);
73 }
74
75 /// <summary>
76 ///Sql语句专用
77 /// </summary>
78 /// <param name="cmdText">T_Sql语句</param>
79 /// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param>
80 /// <returns>返回一个数值表示此SqlCommand命令执行后影响的行数</returns>
81 public static int ExecteNonQueryText(string cmdText, params SqlParameter[] commandParameters)
82 {
83 return ExecteNonQuery(CommandType.Text, cmdText, commandParameters);
84 }
85
86 #endregion
87 #region//GetTable方法
88
89 /// <summary>
90 /// 执行一条返回结果集的SqlCommand，通过一个已经存在的数据库连接
91 /// 使用参数数组提供参数
92 /// </summary>
93 /// <param name="connecttionString">一个现有的数据库连接</param>
94 /// <param name="cmdTye">SqlCommand命令类型</param>
95 /// <param name="cmdText">存储过程的名字或者 T-SQL 语句</param>
96 /// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param>
97 /// <returns>返回一个表集合(DataTableCollection)表示查询得到的数据集</returns>
98 public static DataTableCollection GetTable(string connecttionString, CommandType cmdTye, string cmdText, SqlParameter[] commandParameters)
99 {
100 SqlCommand cmd = new SqlCommand();
101 DataSet ds = new DataSet();
102 using (SqlConnection conn = new SqlConnection(connecttionString))
103 {
104 PrepareCommand(cmd, conn, null, cmdTye, cmdText, commandParameters);
105 SqlDataAdapter adapter = new SqlDataAdapter();
106 adapter.SelectCommand = cmd;
107 adapter.Fill(ds);
108 }
109 DataTableCollection table = ds.Tables;
110 return table;
111 }
112
113 /// <summary>
114 /// 执行一条返回结果集的SqlCommand，通过一个已经存在的数据库连接
115 /// 使用参数数组提供参数
116 /// </summary>
117 /// <param name="cmdTye">SqlCommand命令类型</param>
118 /// <param name="cmdText">存储过程的名字或者 T-SQL 语句</param>
119 /// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param>
120 /// <returns>返回一个表集合(DataTableCollection)表示查询得到的数据集</returns>
121 public static DataTableCollection GetTable(CommandType cmdTye, string cmdText, SqlParameter[] commandParameters)
122 {
123 return GetTable(cmdTye, cmdText, commandParameters);
124 }
125
126
127 /// <summary>
128 /// 存储过程专用
129 /// </summary>
130 /// <param name="cmdText">存储过程的名字或者 T-SQL 语句</param>
131 /// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param>
132 /// <returns>返回一个表集合(DataTableCollection)表示查询得到的数据集</returns>
133 public static DataTableCollection GetTableProducts(string cmdText, SqlParameter[] commandParameters)
134 {
135 return GetTable(CommandType.StoredProcedure, cmdText, commandParameters);
136 }
137
138 /// <summary>
139 /// Sql语句专用
140 /// </summary>
141 /// <param name="cmdText"> T-SQL 语句</param>
142 /// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param>
143 /// <returns>返回一个表集合(DataTableCollection)表示查询得到的数据集</returns>
144 public static DataTableCollection GetTableText(string cmdText, SqlParameter[] commandParameters)
145 {
146 return GetTable(CommandType.Text, cmdText, commandParameters);
147 }
148 #endregion
149
150
151 /// <summary>
152 /// 为执行命令准备参数
153 /// </summary>
154 /// <param name="cmd">SqlCommand 命令</param>
155 /// <param name="conn">已经存在的数据库连接</param>
156 /// <param name="trans">数据库事物处理</param>
157 /// <param name="cmdType">SqlCommand命令类型 (存储过程， T-SQL语句， 等等。)</param>
158 /// <param name="cmdText">Command text，T-SQL语句 例如 Select * from Products</param>
159 /// <param name="cmdParms">返回带参数的命令</param>
160 private static void PrepareCommand(SqlCommand cmd, SqlConnection conn, SqlTransaction trans, CommandType cmdType, string cmdText, SqlParameter[] cmdParms)
161 {
162 //判断数据库连接状态
163 if (conn.State != ConnectionState.Open)
164 conn.Open();
165 cmd.Connection = conn;
166 cmd.CommandText = cmdText;
167 //判断是否需要事物处理
168 if (trans != null)
169 cmd.Transaction = trans;
170 cmd.CommandType = cmdType;
171 if (cmdParms != null)
172 {
173 foreach (SqlParameter parm in cmdParms)
174 cmd.Parameters.Add(parm);
175 }
176 }
177
178 /// <summary>
179 /// Execute a SqlCommand that returns a resultset against the database specified in the connection string
180 /// using the provided parameters.
181 /// </summary>
182 /// <param name="connectionString">一个有效的数据库连接字符串</param>
183 /// <param name="cmdType">SqlCommand命令类型 (存储过程， T-SQL语句， 等等。)</param>
184 /// <param name="cmdText">存储过程的名字或者 T-SQL 语句</param>
185 /// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param>
186 /// <returns>A SqlDataReader containing the results</returns>
187 public static SqlDataReader ExecuteReader(string connectionString, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
188 {
189 SqlCommand cmd = new SqlCommand();
190 SqlConnection conn = new SqlConnection(connectionString);
191 // we use a try/catch here because if the method throws an exception we want to
192 // close the connection throw code, because no datareader will exist, hence the
193 // commandBehaviour.CloseConnection will not work
194 try
195 {
196 PrepareCommand(cmd, conn, null, cmdType, cmdText, commandParameters);
197 SqlDataReader rdr = cmd.ExecuteReader(CommandBehavior.CloseConnection);
198 cmd.Parameters.Clear();
199 return rdr;
200 }
201 catch
202 {
203 conn.Close();
204 throw;
205 }
206 }
207 #region//ExecuteDataSet方法
208
209 /// <summary>
210 /// return a dataset
211 /// </summary>
212 /// <param name="connectionString">一个有效的数据库连接字符串</param>
213 /// <param name="cmdType">SqlCommand命令类型 (存储过程， T-SQL语句， 等等。)</param>
214 /// <param name="cmdText">存储过程的名字或者 T-SQL 语句</param>
215 /// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param>
216 /// <returns>return a dataset</returns>
217 public static DataSet ExecuteDataSet(string connectionString, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
218 {
219 SqlConnection conn = new SqlConnection(connectionString);
220 SqlCommand cmd = new SqlCommand();
221 try
222 {
223 PrepareCommand(cmd, conn, null, cmdType, cmdText, commandParameters);
224 SqlDataAdapter da = new SqlDataAdapter();
225 DataSet ds = new DataSet();
226 da.SelectCommand = cmd;
227 da.Fill(ds);
228 return ds;
229 }
230 catch
231 {
232 conn.Close();
233 throw;
234 }
235 }
236
237
238 /// <summary>
239 /// 返回一个DataSet
240 /// </summary>
241 /// <param name="cmdType">SqlCommand命令类型 (存储过程， T-SQL语句， 等等。)</param>
242 /// <param name="cmdText">存储过程的名字或者 T-SQL 语句</param>
243 /// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param>
244 /// <returns>return a dataset</returns>
245 public static DataSet ExecuteDataSet(CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
246 {
247 return ExecuteDataSet(connectionString, cmdType, cmdText, commandParameters);
248 }
249
250 /// <summary>
251 /// 返回一个DataSet
252 /// </summary>
253 /// <param name="cmdText">存储过程的名字</param>
254 /// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param>
255 /// <returns>return a dataset</returns>
256 public static DataSet ExecuteDataSetProducts(string cmdText, params SqlParameter[] commandParameters)
257 {
258 return ExecuteDataSet(connectionString, CommandType.StoredProcedure, cmdText, commandParameters);
259 }
260
261 /// <summary>
262 /// 返回一个DataSet
263 /// </summary>
264
265 /// <param name="cmdText">T-SQL 语句</param>
266 /// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param>
267 /// <returns>return a dataset</returns>
268 public static DataSet ExecuteDataSetText(string cmdText, params SqlParameter[] commandParameters)
269 {
270 return ExecuteDataSet(connectionString, CommandType.Text, cmdText, commandParameters);
271 }
272
273
274 public static DataView ExecuteDataSet(string connectionString, string sortExpression, string direction, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
275 {
276 SqlConnection conn = new SqlConnection(connectionString);
277 SqlCommand cmd = new SqlCommand();
278 try
279 {
280 PrepareCommand(cmd, conn, null, cmdType, cmdText, commandParameters);
281 SqlDataAdapter da = new SqlDataAdapter();
282 DataSet ds = new DataSet();
283 da.SelectCommand = cmd;
284 da.Fill(ds);
285 DataView dv = ds.Tables[0].DefaultView;
286 dv.Sort = sortExpression + " " + direction;
287 return dv;
288 }
289 catch
290 {
291 conn.Close();
292 throw;
293 }
294 }
295 #endregion
296
297
298 #region // ExecuteScalar方法
299
300
301 /// <summary>
302 /// 返回第一行的第一列
303 /// </summary>
304 /// <param name="cmdType">SqlCommand命令类型 (存储过程， T-SQL语句， 等等。)</param>
305 /// <param name="cmdText">存储过程的名字或者 T-SQL 语句</param>
306 /// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param>
307 /// <returns>返回一个对象</returns>
308 public static object ExecuteScalar(CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
309 {
310 return ExecuteScalar(SqlHelper.connectionString, cmdType, cmdText, commandParameters);
311 }
312
313 /// <summary>
314 /// 返回第一行的第一列存储过程专用
315 /// </summary>
316 /// <param name="cmdText">存储过程的名字</param>
317 /// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param>
318 /// <returns>返回一个对象</returns>
319 public static object ExecuteScalarProducts(string cmdText, params SqlParameter[] commandParameters)
320 {
321 return ExecuteScalar(SqlHelper.connectionString, CommandType.StoredProcedure, cmdText, commandParameters);
322 }
323
324 /// <summary>
325 /// 返回第一行的第一列Sql语句专用
326 /// </summary>
327 /// <param name="cmdText">者 T-SQL 语句</param>
328 /// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param>
329 /// <returns>返回一个对象</returns>
330 public static object ExecuteScalarText(string cmdText, params SqlParameter[] commandParameters)
331 {
332 return ExecuteScalar(SqlHelper.connectionString, CommandType.Text, cmdText, commandParameters);
333 }
334
335 /// <summary>
336 /// Execute a SqlCommand that returns the first column of the first record against the database specified in the connection string
337 /// using the provided parameters.
338 /// </summary>
339 /// <remarks>
340 /// e.g.:
341 /// Object obj = ExecuteScalar(connString, CommandType.StoredProcedure, "PublishOrders", new SqlParameter("@prodid", 24));
342 /// </remarks>
343 /// <param name="connectionString">一个有效的数据库连接字符串</param>
344 /// <param name="cmdType">SqlCommand命令类型 (存储过程， T-SQL语句， 等等。)</param>
345 /// <param name="cmdText">存储过程的名字或者 T-SQL 语句</param>
346 /// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param>
347 /// <returns>An object that should be converted to the expected type using Convert.To{Type}</returns>
348 public static object ExecuteScalar(string connectionString, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
349 {
350 SqlCommand cmd = new SqlCommand();
351
352 using (SqlConnection connection = new SqlConnection(connectionString))
353 {
354 PrepareCommand(cmd, connection, null, cmdType, cmdText, commandParameters);
355 object val = cmd.ExecuteScalar();
356 cmd.Parameters.Clear();
357 return val;
358 }
359 }
360
361 /// <summary>
362 /// Execute a SqlCommand that returns the first column of the first record against an existing database connection
363 /// using the provided parameters.
364 /// </summary>
365 /// <remarks>
366 /// e.g.:
367 /// Object obj = ExecuteScalar(connString, CommandType.StoredProcedure, "PublishOrders", new SqlParameter("@prodid", 24));
368 /// </remarks>
369 /// <param name="connectionString">一个有效的数据库连接字符串</param>
370 /// <param name="cmdType">SqlCommand命令类型 (存储过程， T-SQL语句， 等等。)</param>
371 /// <param name="cmdText">存储过程的名字或者 T-SQL 语句</param>
372 /// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param>
373 /// <returns>An object that should be converted to the expected type using Convert.To{Type}</returns>
374 public static object ExecuteScalar(SqlConnection connection, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
375 {
376 SqlCommand cmd = new SqlCommand();
377 PrepareCommand(cmd, connection, null, cmdType, cmdText, commandParameters);
378 object val = cmd.ExecuteScalar();
379 cmd.Parameters.Clear();
380 return val;
381 }
382
383 #endregion
384
385
386 /// <summary>
387 /// add parameter array to the cache
388 /// </summary>
389 /// <param name="cacheKey">Key to the parameter cache</param>
390 /// <param name="cmdParms">an array of SqlParamters to be cached</param>
391 public static void CacheParameters(string cacheKey, params SqlParameter[] commandParameters)
392 {
393 parmCache[cacheKey] = commandParameters;
394 }
395
396 /// <summary>
397 /// Retrieve cached parameters
398 /// </summary>
399 /// <param name="cacheKey">key used to lookup parameters</param>
400 /// <returns>Cached SqlParamters array</returns>
401 public static SqlParameter[] GetCachedParameters(string cacheKey)
402 {
403 SqlParameter[] cachedParms = (SqlParameter[])parmCache[cacheKey];
404 if (cachedParms == null)
405 return null;
406 SqlParameter[] clonedParms = new SqlParameter[cachedParms.Length];
407 for (int i = 0, j = cachedParms.Length; i < j; i++)
408 clonedParms[i] = (SqlParameter)((ICloneable)cachedParms[i]).Clone();
409 return clonedParms;
410 }
411
412
413 /// <summary>
414 /// 检查是否存在
415 /// </summary>
416 /// <param name="strSql">Sql语句</param>
417 /// <returns>bool结果</returns>
418 public static bool Exists(string strSql)
419 {
420 int cmdresult = Convert.ToInt32(ExecuteScalar(connectionString, CommandType.Text, strSql, null));
421 if (cmdresult == 0)
422 {
423 return false;
424 }
425 else
426 {
427 return true;
428 }
429 }
430
431 /// <summary>
432 /// 检查是否存在
433 /// </summary>
434 /// <param name="strSql">Sql语句</param>
435 /// <param name="cmdParms">参数</param>
436 /// <returns>bool结果</returns>
437 public static bool Exists(string strSql, params SqlParameter[] cmdParms)
438 {
439 int cmdresult = Convert.ToInt32(ExecuteScalar(connectionString, CommandType.Text, strSql, cmdParms));
440 if (cmdresult == 0)
441 {
442 return false;
443 }
444 else
445 {
446 return true;
447 }
448 }
449 }
450
451 }
452
453