C#连接oracle实现增删改查

以users表为例，有三个字段，自增长的编号id，int类型；名称name，nvarchar类型，密码pwd，nvarchar类型

首先在vs2005中引入System.Data.OracleClient;命名空间

        publicint Insert(stringname, string pwd)
        {
           OracleConnectionconn = new OracleConnection(@"Data Source=SBZX;User ID=simis;Password=zeda");
            conn.Open();
            stringsql = "insert into users(name,pwd)values(:name,:pwd)";
            OracleCommandcmd = new OracleCommand(sql,conn);
            OracleParameter parn = new OracleParameter(":name", name);
           cmd.Parameters.Add(parn);
            OracleParameter parp = new OracleParameter(":pwd", name);
           cmd.Parameters.Add(parp);
            int result = cmd.ExecuteNonQuery(); //result接收受影响行数，也就是说result大于0的话表示添加成功
            conn.Close();
            cmd.Dispose();
            return result;         
        }
        publicint Update(int id)
        {
            OracleConnectionconn = new OracleConnection(@"Data Source=SBZX;User ID=simis;Password=zeda");
            conn.Open();
            stringsql = "delete from users where id=:id";
            OracleCommandcmd = new OracleCommand(sql,conn);
            OracleParameterpari = new OracleParameter(":id", id);
           cmd.Parameters.Add(pari);      
            int result = cmd.ExecuteNonQuery();  //result接收受影响行数，也就是说result大于0的话表示添加成功
            conn.Close();
            cmd.Dispose();
            return result;          
       }
        publicint Insert(stringname, string pwd, intid)
        {
            OracleConnectionconn = new OracleConnection(@"Data Source=SBZX;User ID=simis;Password=zeda");
            conn.Open();
            stringsql = "update users set name=:name,pwd=:pwdwhere id=:id";
            OracleCommandcmd = new OracleCommand(sql,conn);
            OracleParameterparn = new OracleParameter(":name", name);
           cmd.Parameters.Add(parn);
            OracleParameterparp = new OracleParameter(":pwd", name);
           cmd.Parameters.Add(parp);        
            OracleParameterpari = new OracleParameter(":id", id);
            cmd.Parameters.Add(pari); 
            intresult = cmd.ExecuteNonQuery();
            conn.Close();
            cmd.Dispose();
            returnresult;        
        }
        publicDataTable Select()
        {
            OracleConnectionconn = new OracleConnection(@"Data Source=SBZX;User ID=simis;Password=zeda");
            conn.Open();
            stringsql = "select * from users";
            OracleCommandcmd = new OracleCommand(sql,conn);
            OracleDataAdapteroda = new OracleDataAdapter(cmd);
            DataTable dt = new DataTable();
            oda.Fill(dt);
            conn.Close();
            cmd.Dispose();
            return dt;        
        }

方法写好后，下面举一个查询的例子，在form窗体中拖一个DataGridView,然后在Load方法中

    private void Form1_Load(object sender, EventArgs e)

        {

              dataGridView1.DataSource = Select();

        }

这样一运行，DataGridView中就会显示数据了