1 using System;
2 using System.Collections.Generic;
3 using System.Linq;
4 using System.Text;
5 using MySql.Data;
6 using MySql.Data.MySqlClient;
7 using System.Data;
8 using System.Collections;
9 /*
10 * <summary>
11 * title:mysql 数据库连接类
12 * date:2015-1-5
13 * version:MySql.Data5.1.5.0
14 * author：
15 * </summary>
16 */
17 namespace readMysql
18 {
19 public abstract class DbManager
20 {
21 //数据库连接字符串
22 public static string dbUrl = "DataBase='test';Data Source='localhost';User Id='root';Password='root';charset='utf8';pooling=true";
23 // 用于缓存参数的HASH表
24 private static Hashtable parmCache = Hashtable.Synchronized(new Hashtable());
25
26 /// <summary>
27 /// 给定连接的数据库用假设参数执行一个sql命令（不返回数据集）
28 /// </summary>
29 /// <param name="connectionString">一个有效的连接字符串</param>
30 /// <param name="cmdType">命令类型(存储过程, 文本, 等等)</param>
31 /// <param name="cmdText">存储过程名称或者sql命令语句</param>
32 /// <param name="commandParameters">执行命令所用参数的集合</param>
33 /// <returns>执行命令所影响的行数</returns>
34 public static int ExecuteNonQuery(string connectionString, CommandType cmdType, string cmdText, params MySqlParameter[] commandParameters)
35 {
36
37 MySqlCommand cmd = new MySqlCommand();
38
39 using (MySqlConnection conn = new MySqlConnection(connectionString))
40 {
41 PrepareCommand(cmd, conn, null, cmdType, cmdText, commandParameters);
42 int val = cmd.ExecuteNonQuery();
43 cmd.Parameters.Clear();
44 return val;
45 }
46 }
47
48 /// <summary>
49 /// 用现有的数据库连接执行一个sql命令（不返回数据集）
50 /// </summary>
51 /// <param name="connection">一个现有的数据库连接</param>
52 /// <param name="cmdType">命令类型(存储过程, 文本, 等等)</param>
53 /// <param name="cmdText">存储过程名称或者sql命令语句</param>
54 /// <param name="commandParameters">执行命令所用参数的集合</param>
55 /// <returns>执行命令所影响的行数</returns>
56 public static int ExecuteNonQuery(MySqlConnection connection, CommandType cmdType, string cmdText, params MySqlParameter[] commandParameters)
57 {
58
59 MySqlCommand cmd = new MySqlCommand();
60
61 PrepareCommand(cmd, connection, null, cmdType, cmdText, commandParameters);
62 int val = cmd.ExecuteNonQuery();
63 cmd.Parameters.Clear();
64 return val;
65 }
66
67 /// <summary>
68 ///使用现有的SQL事务执行一个sql命令（不返回数据集）
69 /// </summary>
70 /// <remarks>
71 ///举例:
72 /// int result = ExecuteNonQuery(connString, CommandType.StoredProcedure, "PublishOrders", new MySqlParameter("@prodid", 24));
73 /// </remarks>
74 /// <param name="trans">一个现有的事务</param>
75 /// <param name="cmdType">命令类型(存储过程, 文本, 等等)</param>
76 /// <param name="cmdText">存储过程名称或者sql命令语句</param>
77 /// <param name="commandParameters">执行命令所用参数的集合</param>
78 /// <returns>执行命令所影响的行数</returns>
79 public static int ExecuteNonQuery(MySqlTransaction trans, CommandType cmdType, string cmdText, params MySqlParameter[] commandParameters)
80 {
81 MySqlCommand cmd = new MySqlCommand();
82 PrepareCommand(cmd, trans.Connection, trans, cmdType, cmdText, commandParameters);
83 int val = cmd.ExecuteNonQuery();
84 cmd.Parameters.Clear();
85 return val;
86 }
87
88 /// <summary>
89 /// 用执行的数据库连接执行一个返回数据集的sql命令
90 /// </summary>
91 /// <remarks>
92 /// 举例:
93 /// MySqlDataReader r = ExecuteReader(connString, CommandType.StoredProcedure, "PublishOrders", new MySqlParameter("@prodid", 24));
94 /// </remarks>
95 /// <param name="connectionString">一个有效的连接字符串</param>
96 /// <param name="cmdType">命令类型(存储过程, 文本, 等等)</param>
97 /// <param name="cmdText">存储过程名称或者sql命令语句</param>
98 /// <param name="commandParameters">执行命令所用参数的集合</param>
99 /// <returns>包含结果的读取器</returns>
100 public static MySqlDataReader ExecuteReader(string connectionString, CommandType cmdType, string cmdText, params MySqlParameter[] commandParameters)
101 {
102 //创建一个MySqlCommand对象
103 MySqlCommand cmd = new MySqlCommand();
104 //创建一个MySqlConnection对象
105 MySqlConnection conn = new MySqlConnection(connectionString);
106
107 //在这里我们用一个try/catch结构执行sql文本命令/存储过程，因为如果这个方法产生一个异常我们要关闭连接，因为没有读取器存在，
108 //因此commandBehaviour.CloseConnection 就不会执行
109 try
110 {
111 //调用 PrepareCommand 方法，对 MySqlCommand 对象设置参数
112 PrepareCommand(cmd, conn, null, cmdType, cmdText, commandParameters);
113 //调用 MySqlCommand 的 ExecuteReader 方法
114 MySqlDataReader reader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
115 //清除参数
116 cmd.Parameters.Clear();
117 return reader;
118 }
119 catch
120 {
121 //关闭连接，抛出异常
122 conn.Close();
123 throw;
124 }
125 }
126
127 /// <summary>
128 /// 返回DataSet
129 /// </summary>
130 /// <param name="connectionString">一个有效的连接字符串</param>
131 /// <param name="cmdType">命令类型(存储过程, 文本, 等等)</param>
132 /// <param name="cmdText">存储过程名称或者sql命令语句</param>
133 /// <param name="commandParameters">执行命令所用参数的集合</param>
134 /// <returns></returns>
135 public static DataSet GetDataSet(string connectionString, CommandType cmdType, string cmdText, params MySqlParameter[] commandParameters)
136 {
137 //创建一个MySqlCommand对象
138 MySqlCommand cmd = new MySqlCommand();
139 //创建一个MySqlConnection对象
140 MySqlConnection conn = new MySqlConnection(connectionString);
141
142 //在这里我们用一个try/catch结构执行sql文本命令/存储过程，因为如果这个方法产生一个异常我们要关闭连接，因为没有读取器存在，
143
144 try
145 {
146 //调用 PrepareCommand 方法，对 MySqlCommand 对象设置参数
147 PrepareCommand(cmd, conn, null, cmdType, cmdText, commandParameters);
148 //调用 MySqlCommand 的 ExecuteReader 方法
149 MySqlDataAdapter adapter = new MySqlDataAdapter();
150 adapter.SelectCommand = cmd;
151 DataSet ds = new DataSet();
152
153 adapter.Fill(ds);
154 //清除参数
155 cmd.Parameters.Clear();
156 conn.Close();
157 return ds;
158 }
159 catch (Exception e)
160 {
161 throw e;
162 }
163 }
164
165
166
167 /// <summary>
168 /// 用指定的数据库连接字符串执行一个命令并返回一个数据集的第一列
169 /// </summary>
170 /// <remarks>
171 ///例如:
172 /// Object obj = ExecuteScalar(connString, CommandType.StoredProcedure, "PublishOrders", new MySqlParameter("@prodid", 24));
173 /// </remarks>
174 ///<param name="connectionString">一个有效的连接字符串</param>
175 /// <param name="cmdType">命令类型(存储过程, 文本, 等等)</param>
176 /// <param name="cmdText">存储过程名称或者sql命令语句</param>
177 /// <param name="commandParameters">执行命令所用参数的集合</param>
178 /// <returns>用 Convert.To{Type}把类型转换为想要的 </returns>
179 public static object ExecuteScalar(string connectionString, CommandType cmdType, string cmdText, params MySqlParameter[] commandParameters)
180 {
181 MySqlCommand cmd = new MySqlCommand();
182
183 using (MySqlConnection connection = new MySqlConnection(connectionString))
184 {
185 PrepareCommand(cmd, connection, null, cmdType, cmdText, commandParameters);
186 object val = cmd.ExecuteScalar();
187 cmd.Parameters.Clear();
188 return val;
189 }
190 }
191
192 /// <summary>
193 /// 用指定的数据库连接执行一个命令并返回一个数据集的第一列
194 /// </summary>
195 /// <remarks>
196 /// 例如:
197 /// Object obj = ExecuteScalar(connString, CommandType.StoredProcedure, "PublishOrders", new MySqlParameter("@prodid", 24));
198 /// </remarks>
199 /// <param name="connection">一个存在的数据库连接</param>
200 /// <param name="cmdType">命令类型(存储过程, 文本, 等等)</param>
201 /// <param name="cmdText">存储过程名称或者sql命令语句</param>
202 /// <param name="commandParameters">执行命令所用参数的集合</param>
203 /// <returns>用 Convert.To{Type}把类型转换为想要的 </returns>
204 public static object ExecuteScalar(MySqlConnection connection, CommandType cmdType, string cmdText, params MySqlParameter[] commandParameters)
205 {
206
207 MySqlCommand cmd = new MySqlCommand();
208
209 PrepareCommand(cmd, connection, null, cmdType, cmdText, commandParameters);
210 object val = cmd.ExecuteScalar();
211 cmd.Parameters.Clear();
212 return val;
213 }
214
215 /// <summary>
216 /// 将参数集合添加到缓存
217 /// </summary>
218 /// <param name="cacheKey">添加到缓存的变量</param>
219 /// <param name="commandParameters">一个将要添加到缓存的sql参数集合</param>
220 public static void CacheParameters(string cacheKey, params MySqlParameter[] commandParameters)
221 {
222 parmCache[cacheKey] = commandParameters;
223 }
224
225 /// <summary>
226 /// 找回缓存参数集合
227 /// </summary>
228 /// <param name="cacheKey">用于找回参数的关键字</param>
229 /// <returns>缓存的参数集合</returns>
230 public static MySqlParameter[] GetCachedParameters(string cacheKey)
231 {
232 MySqlParameter[] cachedParms = (MySqlParameter[])parmCache[cacheKey];
233
234 if (cachedParms == null)
235 return null;
236
237 MySqlParameter[] clonedParms = new MySqlParameter[cachedParms.Length];
238
239 for (int i = 0, j = cachedParms.Length; i < j; i++)
240 clonedParms[i] = (MySqlParameter)((ICloneable)cachedParms[i]).Clone();
241
242 return clonedParms;
243 }
244
245 /// <summary>
246 /// 准备执行一个命令
247 /// </summary>
248 /// <param name="cmd">sql命令</param>
249 /// <param name="conn">OleDb连接</param>
250 /// <param name="trans">OleDb事务</param>
251 /// <param name="cmdType">命令类型例如 存储过程或者文本</param>
252 /// <param name="cmdText">命令文本,例如:Select * from Products</param>
253 /// <param name="cmdParms">执行命令的参数</param>
254 private static void PrepareCommand(MySqlCommand cmd, MySqlConnection conn, MySqlTransaction trans, CommandType cmdType, string cmdText, MySqlParameter[] cmdParms)
255 {
256
257 if (conn.State != ConnectionState.Open)
258 conn.Open();
259
260 cmd.Connection = conn;
261 cmd.CommandText = cmdText;
262
263 if (trans != null)
264 cmd.Transaction = trans;
265
266 cmd.CommandType = cmdType;
267
268 if (cmdParms != null)
269 {
270 foreach (MySqlParameter parm in cmdParms)
271 cmd.Parameters.Add(parm);
272 }
273 }
274
275 }
276 }
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