CommandText属性尚未正确初始化(MySqlDataReader)

Question

读者总是null,我不明白为什么.

在使用一种方法连接之前,一切正常.

码:

private MySqlConnection connection;
private MySqlCommand command;
private MySqlDataReader Reader;

public Form1()
{
    InitializeComponent();
    DBint();
}
private void DBint()
{
    string myConnectionString = "SERVER=xxx;PORT=3306;" +
                                "DATABASE=xxx;" +
                                "UID=root;" +
                                "PASSWORD=xxx;";
    connection = new MySqlConnection(myConnectionString);
    command = connection.CreateCommand();
    MySqlDataReader Reader;//error occures her
    connection.Open();
    Reader = command.ExecuteReader();               
    //MessageBox.Show(tmp);                
    //connection.Close();    
}

Answer 1

您应该CommandText使用SELECT语句或存储过程名称设置命令对象的属性,不能执行空命令.