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想ACCESS数据库插入新的用户

  1  public string AddUserN = ""; //定义用户名字符串
  2         public string paswrd1 = "";  //密码1
  3         public string paswrd2 = "";  //确认密码
  4         public string userKind = ""; //用户类型
  5         public string myconnstr = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=ErLake.mdb";
  6        
  7 
  8         private void 添加用户frm_Load(object sender, EventArgs e)
  9         {
 10 
 11             loadtable();
 12 
 13         }
 14 
 15         private void button1_Click(object sender, EventArgs e)
 16         {
 17             userKind = comboBox1.Text.ToString();//获取用户类型
 18             //MessageBox.Show(userKind);
 19             AddUserN = textBox1.Text.Trim();
 20             paswrd1 = textBox2.Text.Trim();
 21             paswrd2 = textBox3.Text.Trim();
 22             if (userKind == "")
 23             {
 24                 MessageBox.Show("请选择添加的用户类型", "提示", MessageBoxButtons.OKCancel, MessageBoxIcon.Information);
 25             }
 26             else
 27             {
 28 
 29                 if (AddUserN == "")
 30                 {
 31                     MessageBox.Show("请填写用户名", "提示", MessageBoxButtons.OKCancel, MessageBoxIcon.Information);
 32                 }
 33                 else
 34                 {
 35                     string sql = "Select count(*) from tb_admin where 用户名='" + AddUserN + "'";//查询表里用户名为输入用户名的条数（有几条数据）
 36                     OleDbConnection myconn = new OleDbConnection(myconnstr);
 37                     //打开数据库
 38                     myconn.Open();
 39                     //执行SQL
 40                     OleDbCommand commd = new OleDbCommand(sql, myconn);//
 41 
 42                     int n = (int)commd.ExecuteScalar();//得到条数
 43                     myconn.Close();//关闭
 44 
 45                     if (n >= 1)//存在
 46                     {
 47                         MessageBox.Show("该用户已存在！", "提示", MessageBoxButtons.OKCancel, MessageBoxIcon.Information);
 48                     }
 49                     else
 50                     {
 51                         if (paswrd1 == "")
 52                         {
 53                             MessageBox.Show("请填写用户密码", "提示", MessageBoxButtons.OKCancel, MessageBoxIcon.Information);
 54                         }
 55                         else
 56                         {
 57 
 58                             if (paswrd2 == "")
 59                             {
 60                                 MessageBox.Show("请填写确认的用户密码", "提示", MessageBoxButtons.OKCancel, MessageBoxIcon.Information);
 61                             }
 62                             else
 63                             {
 64                                 if (paswrd1 == paswrd2)
 65                                 {
 66                                     //插入字符串
 67                                     string mySQL = "insert into tb_admin (用户名,权限,密码) values ('" + AddUserN + "','" + userKind + "','" + paswrd2 + "')";
 68                                     //创建连接实例
 69                                     OleDbConnection myconn1 = new OleDbConnection(myconnstr);
 70                                     //打开数据库
 71                                     myconn1.Open();
 72                                     //执行SQL
 73                                     OleDbCommand commd1 = new OleDbCommand(mySQL, myconn1);//
 74                                     //写入
 75                                     commd1.ExecuteNonQuery();
 76                                     //命令关闭连接
 77                                     commd1.Connection.Close();
 78                                     //数据库关闭连接
 79                                     myconn1.Close();
 80                                     //
 81                                     MessageBox.Show("增加用户成功", "提示", MessageBoxButtons.OKCancel, MessageBoxIcon.Information);
 82                                     
 83                                     loadtable();//加载用户信息表
 84 
 85                                 }
 86                                 else
 87                                 {
 88                                     MessageBox.Show("密码填写不一致，请重新填写", "提示", MessageBoxButtons.OKCancel, MessageBoxIcon.Information);
 89                                 }
 90                             }
 91                         }
 92                     }
 93                 }
 94             }
 95         }
 96 
 97         public void loadtable()
 98         {
 99             DataTable mytableall = new DataTable();
100             string mysqlall = "select * from tb_admin ";
101             OleDbDataAdapter da = new OleDbDataAdapter(mysqlall, myconnstr);//数据适配器
102             da.Fill(mytableall);//填表
103             dataGridView1.DataSource = mytableall;
104         }

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原文地址：https://www.cnblogs.com/yuhuameng/p/3668496.html