C#连接oracle实现增删改查

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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