[英]c# MySqlCommand doesn't appear to be resolving Parameters
我正在嘗試使用參數運行MySqlCommand,但是當我查看SQL日志時,參數顯示出來。
我已嘗試使用@和?,在我的sqlconnection字符串中嘗試使用'old syntax = yes'。
這是我的代碼。
bool CheckLoginDetails(string username, string password){
DataTable dt = new DataTable ();
MySqlCommand command = new MySqlCommand ("select * from `accounts` where `username` = '@username';", SL.Database.connection);
command.Parameters.AddWithValue ("@username", username);
dt.Load (command.ExecuteReader());
}
這是SQL日志。
150823 3:19:50 22 Connect root@localhost on unity_test
22 Query SHOW VARIABLES
22 Query SHOW COLLATION
22 Query SET character_set_results=NULL
22 Init DB unity_test
150823 3:19:52 22 Query select * from `accounts` where `username` = '@username'
我正在使用.net 2.0而且我不確定mysql dll版本,我發現這里: http : //forum.unity3d.com/threads/reading-database-and-or-spreadsheets.11466/
由於Unity,我無法升級.net。 任何建議將不勝感激!
建議(未測試):
bool CheckLoginDetails(string username, string password){
string sql = select * from accounts where username = ?";
MySqlCommand command = new MySqlCommand(sql);
command.Parameters.Add(new MySqlParameter("", username));
MySqlDataReader r = command.ExecuteReader();
...
}
重點是“?” 應該管用。
嘗試command.Parameters.Add(“@ username”,MysqlDbType.Varchar).Value = username;
應該管用 !
試試這個,改變
MySqlCommand command = new MySqlCommand ("select * from `accounts` where `username` = '@username';", SL.Database.connection);
command.Parameters.AddWithValue ("@username", username);
至
MySqlCommand command = new MySqlCommand ("select * from accounts where username = @username;", SL.Database.connection);
command.Parameters.Add("@username", username);
試試這個(建議)
bool CheckLoginDetails(string username, string password){
DataTable dt = new DataTable ();
MySqlCommand command = new MySqlCommand ("select * from accounts where username = @username;", SL.Database.connection);
command.Parameters.AddWithValue ("@username", username);
dt.Load (command.ExecuteReader());
}
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