2
static public void ConnectAndQuery()
{
string connectionString = GetConnectionString();
using (OracleConnection conn = new OracleConnection())
{
conn.ConnectionString = connectionString;
conn.Open();
Console.WriteLine("State: " + conn.State);
Console.WriteLine("Connection String: " + conn.ConnectionString);
OracleCommand command = conn.CreateCommand();
string sql = "SELECT * FROM users";
command.CommandText = sql;
OracleDataReader reader = command.ExecuteReader();
while (reader.Read())
{
string myField = (string)reader["MYFIELD"];
Console.WriteLine(myField);
}
}
}
連接已建立並正常工作,但在嘗試從數據庫中獲取數據時,獲得IndexOutOfRangeException
。該例外被捕獲在獲取數據異常 - C#與OracleDB
string myField = (string)reader["MYFIELD"];
我看了有關OracleDataReader和以瞭解讀者的命令信息,但是......它存儲在一個陣列或任何其它序列採集的數據?爲什麼我會得到IndexOutOfRangeException
以及爲什麼讀者需要在[]
括號中提供參數?