C# UWP 查看两个数据库行

Question

string myConnectionString;
myConnectionString = "server=localhost;uid=root;pwd=root;database=medicloud;SslMode=None;charset=utf8";

MySqlConnection connection = new MySqlConnection(myConnectionString);
MySqlCommand cmd = new MySqlCommand();

cmd.CommandType = CommandType.Text;
string sqlStr = "Select arm from assign where userId=@name";
cmd.Parameters.AddWithValue("@name", txtValue.Text);

cmd.CommandText = sqlStr;
cmd.Connection = connection;

EncodingProvider ppp;
ppp = CodePagesEncodingProvider.Instance;
Encoding.RegisterProvider(ppp);

connection.Open();

MySqlDataReader reader = cmd.ExecuteReader();
reader.Read();
string databaseLine = (reader["arm"].ToString());
connection.Close();

#endregion
txtExercise.Text = databaseLine + " (Uncomplete)\n" + databaseLine;

我正在尝试查看数据库中的两行数据。但是，我不知道如何查看它。有人能帮我吗？我尝试输入“databaseLine”两次，但都看到了同一行

如您所见，Rachel 有两种锻炼方式。我想在 txtExercise.Text 查看这两个练习。但是我只能看第一个，看不到第二个。

Answer 1

reader.Read() 将阅读器移动到下一行。您只调用一次，因此只读取第一行。

您可以在 while 循环中执行此操作。

MySqlDataReader reader = cmd.ExecuteReader();
while (reader.Read()) //reader.Read returns false when there are no more rows.
{
    string databaseLine = (reader["arm"].ToString()); //read the value of the current row
    txtExercise.Text += databaseLine + " (Uncomplete)\n"; //append the value to the output        
}