.net连接数据库后台代码-------------返回数据集
方式一:
string conStr = "Data Source=地址(localhost);Initial Catalog=数据库名称;User ID=用户名;Password=密码;";
SqlConnection con = new SqlConnection(conStr);
SqlCommand com = con.CreateCommand();
com.CommandText = "SQL语句";
con.Open();
DataSet ds = new DataSet();
SqlDataAdapter sad = new SqlDataAdapter(com);
sad.Fill(ds);
DataTable dt = ds.Tables[0];
con.Close();
方式二:
SqlCommand com = new SqlCommand(sql, conn);
SqlDataAdapter sda = new SqlDataAdapter(com);
sda.Fill(ds1);
方式三:SqlDataReader
SqlDataReader reder = com.ExecuteReader();
DataTable dt = new DataTable();
dt.Columns.Add("name", typeof(string));
dt.Columns.Add("mobile",typeof(string));
dt.Columns.Add("age", typeof(int));
while (reder.Read())
{
DataRow dr = dt.NewRow();
dr["name"] = reder["name"];
dr["mobile"] = reder["mobile"];
dr["age"] = reder["age"];
dt.Rows.Add(dr);
}
com.ExecuteNonQuery();返回受影响的行数,进行插入更新操作时使用