c# 连接Mysql数据库

mysql.data.dll下载_c#连接mysql必要插件
mysql.data.dll是C#操作MYSQL的驱动文件，是c#连接mysql必要插件，使c#语言更简洁的操作mysql数据库。当你的电脑弹出提示“丢失mysql.data.dll”或“无法找到mysql.data.dll”等错误问题，请下载本站为你提供的dll文件，使用它可以帮助用户解决上述问题。

dll文件修复方法：

1、解压下载的文件。

2、复制文件“mysql.data.dll”到系统目录下。

3、系统目录一般为：C:\WINNT\System32 64位系统为C:\Windows\SysWOW64

4、最后点击开始菜单-->运行-->输入regsvr32 mysql.data.dll 后，回车即可解决错误提示！

第三方组件：Mysql.Data.dll
说明：下载Mysql.Data.dll，然后在项目中添加该组件的引用，在代码页里输入using Mysql.Data.MysqlClient，我们就可以顺利的使用该类库的函数建立连接了。

以下是几个常用函数：

1 #region  建立MySql数据库连接
2     /// <summary>
3     /// 建立数据库连接.
4     /// </summary>
5     /// <returns>返回MySqlConnection对象</returns>
6     public MySqlConnection getmysqlcon()
7     {
8     //http://sosoft.cnblogs.com/
9         string M_str_sqlcon = "server=localhost;user id=root;password=root;database=abc"; //根据自己的设置
10         MySqlConnection myCon = new MySqlConnection(M_str_sqlcon);
11         return myCon;
12     }
13     #endregion
14
15     #region  执行MySqlCommand命令
16     /// <summary>
17     /// 执行MySqlCommand
18     /// </summary>
19     /// <param name="M_str_sqlstr">SQL语句</param>
20     public void getmysqlcom(string M_str_sqlstr)
21     {
22         MySqlConnection mysqlcon = this.getmysqlcon();
23         mysqlcon.Open();
24         MySqlCommand mysqlcom = new MySqlCommand(M_str_sqlstr, mysqlcon);
25         mysqlcom.ExecuteNonQuery();
26         mysqlcom.Dispose();
27         mysqlcon.Close();
28         mysqlcon.Dispose();
29     }
30     #endregion
31
32 #region  创建MySqlDataReader对象
33     /// <summary>
34     /// 创建一个MySqlDataReader对象
35     /// </summary>
36     /// <param name="M_str_sqlstr">SQL语句</param>
37     /// <returns>返回MySqlDataReader对象</returns>
38     public MySqlDataReader getmysqlread(string M_str_sqlstr)
39     {
40         MySqlConnection mysqlcon = this.getmysqlcon();
41         MySqlCommand mysqlcom = new MySqlCommand(M_str_sqlstr, mysqlcon);
42         mysqlcon.Open();
43         MySqlDataReader mysqlread = mysqlcom.ExecuteReader(CommandBehavior.CloseConnection);
44         return mysqlread;
45     }
46     #endregion

1 using System.Data;
2
3 using MySql.Data.MySqlClient;
4
5
6
7
8
9 private MySqlConnection conn;
10
11 private DataTable data;
12
13 private MySqlDataAdapter da;
14
15 private MySqlCommandBuilder  cb;
16
17 private DataGrid  dataGrid;
18
19
20
21 private void connectBtn_Click(object sender, System.EventArgs e)
22
23  {
24
25  if (conn != null)
26
27  conn.Close();
28
29
30
31  string connStr = String.Format("server={0};user id={1}; password={2}; port={3}; database=mysql; pooling=false; charset=utf8",
32
33  server.Text, userid.Text, password.Text, 3306);
34
35
36
37  try
38
39  {
40
41  conn = new MySqlConnection( connStr );
42
43  conn.Open();
44
45
46
47  GetDatabases();
48
49                 MessageBox.Show("连接数据库成功!");
50
51  }
52
53  catch (MySqlException ex)
54
55  {
56
57  MessageBox.Show( "Error connecting to the server: " + ex.Message );
58
59  }
60
61  }
62
63
64
65  private void GetDatabases()
66
67  {
68
69  MySqlDataReader reader = null;
70
71  MySqlCommand cmd = new MySqlCommand("SHOW DATABASES", conn);
72
73
74
75  try
76
77  {
78
79  reader = cmd.ExecuteReader();
80
81  databaseList.Items.Clear();
82
83  while (reader.Read())
84
85  {
86
87  databaseList.Items.Add( reader.GetString(0) );
88
89  }
90
91  }
92
93  catch (MySqlException ex)
94
95  {
96
97  MessageBox.Show("Failed to populate database list: " + ex.Message );
98
99  }
100
101  finally
102
103  {
104
105  if (reader != null) reader.Close();
106
107  }
108
109  }
110
111
112
113  private void databaseList_SelectedIndexChanged(object sender, System.EventArgs e)
114
115  {
116
117  MySqlDataReader reader = null;
118
119  conn.ChangeDatabase(databaseList.SelectedItem.ToString());
120
121 //http://sosoft.cnblogs.com/
122
123  MySqlCommand cmd = new MySqlCommand("SHOW TABLES", conn);
124
125  try
126
127  {
128
129  reader = cmd.ExecuteReader();
130
131  tables.Items.Clear();
132
133  while (reader.Read())
134
135  {
136
137  tables.Items.Add( reader.GetString(0) );
138
139  }
140
141  }
142
143  catch (MySqlException ex)
144
145  {
146
147  MessageBox.Show("Failed to populate table list: " + ex.Message );
148
149  }
150
151  finally
152
153  {
154
155  if (reader != null) reader.Close();
156
157  }
158
159  }
160
161
162
163  private void tables_SelectedIndexChanged(object sender, System.EventArgs e)
164
165  {
166
167  data = new DataTable();
168
169
170
171  da = new MySqlDataAdapter("SELECT * FROM " + tables.SelectedItem.ToString(), conn );
172
173      cb = new MySqlCommandBuilder( da ); // 此处必须有，否则无法更新
174
175
176
177  da.Fill( data );
178
179
180
181  dataGrid.DataSource = data;
182
183  }
184
185
186
187  private void updateBtn_Click(object sender, System.EventArgs e)
188
189  {
190
191  DataTable changes = data.GetChanges();
192
193  da.Update( changes );
194
195  data.AcceptChanges();
196
197  }

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