C#连接达梦数据库

达梦数据库提供了很多驱动，包括.Net 。在达梦数据的安装目录找到 \dmdbms\bin\ DmProvider.dll 程序集，这就是.Net 操作达梦数据库的驱动程序。我们用VS建个Demo 引用这个dll。
增删改查的演示代码如下：

using Dm;

/// <summary>
/// 获得数据库链接
/// </summary>
/// <returns></returns>
public DmConnection GetConn()
{
    string strconn = "server=localhost;database=Cnblogs;User Id=SYSDBA;PWD=SYSDBA";
    DmConnection conn = new DmConnection(strconn);
    conn.Open();
    return conn;
}

//插入数据
public void Insert()
{
    DmConnection conn = GetConn();
    string strCmd = "Insert into  SYSDBA.Users(Name,Sex,Age)values('xumingxiang','man',25)";
    DmCommand cmd = new DmCommand(strCmd, conn);
    int effect = cmd.ExecuteNonQuery();
    conn.Close();//关闭数据库链接
}

/// <summary>
/// 删除数据
/// </summary>
public void Update()
{
    DmConnection conn = GetConn();
    string strCmd = "update  SYSDBA.Users set Age=100 where Id=1";
    DmCommand cmd = new DmCommand(strCmd, conn);
    int effect = cmd.ExecuteNonQuery();
    conn.Close();
}

/// <summary>
/// 删除数据
/// </summary>
public void Delete()
{
    DmConnection conn = GetConn();
    string strCmd = "delete from  SYSDBA.Users  where Id=1";
    DmCommand cmd = new DmCommand(strCmd, conn);
    int effect = cmd.ExecuteNonQuery();
    conn.Close();
}

/// <summary>
/// 用ExecuteReader查询数据
/// </summary>
public void QueryByExecuteReader()
{
    DmConnection conn = GetConn();
    string strCmd = "select * from  SYSDBA.Users ";
    DmCommand cmd = new DmCommand(strCmd, conn);
    DmDataReader dr = cmd.ExecuteReader();

    int id;
    string name;
    string sex;
    int age;
    while (dr.Read())
    {
        id = dr.GetInt32(0);
        name = dr.GetString(1);
        sex = dr.GetString(2);
        age = dr.GetInt32(3);
    }
}


/// <summary>
///用DataAdapter 查询数据，返回DataSet
/// </summary>
public DataSet QueryByDataAdapter()
{
    DmConnection conn = GetConn();
    string strCmd = "select * from  SYSDBA.Users ";
    DmDataAdapter da = new DmDataAdapter(strCmd,conn);
    DataSet ds = new DataSet();
    da.Fill(ds);
    return ds;
}