未能使用数据适配器填充数据表

Question

我尝试将数据与数据库匹配并使用dataadapter填充我的数据表。如果匹配，用dataadapter填充数据表。如果不匹配，则显示消息。但我的用户名和密码与数据库匹配，它仍然显示消息。在调试模式下，用户名和密码全部通过，但不填写数据表。

using (OracleConnection conn = new OracleConnection()) 
{ 
    conn.ConnectionString = connStr; 
    conn.Open(); 

    string sql = @"select user_id, password, status, role_id, email, contact_no, 
        last_login_date, created_by, last_update_date, last_update_by 
        from users where user_id = :userID and password = :pwd"; 

    using (OracleCommand cmd = new OracleCommand()) 
    { 
     cmd.Connection = conn; 
     cmd.CommandText = sql; 

     cmd.Parameters.Add("userID", OracleType.VarChar).Value = userID; 

     cmd.Parameters.Add("pwd", OracleType.VarChar).Value = pwd; 

     DataTable dt = new DataTable(); 
     OracleDataAdapter adapter = new OracleDataAdapter(cmd); 
     adapter.Fill(dt); 

     if (dt.Rows.Count <= 0) 
     { 
      msg = "Invalid Login ID or Password"; 
     } 

     return dt; 
    } 
} 

dt.Rows.Count是0.但我检查用户名和密码是完全相同的数据库。

Answer 1

SQL：

create procedure sp_authenticate 
(
    @userId varchar(50), 
    @pass varchar(50) 
) 
as 
begin 
    select user_id, password, status, role_id, email, contact_no, 
    last_login_date, created_by, last_update_date, last_update_by 
    from users where user_id = @userid and password = @pass 
end 

C＃代码：

using (OracaleConnection con=new OracaleConnection()) 
{ 
    conn.ConnectionString = connStr; 
    conn.Open(); 

    using (OracleCommand cmd = new OracleCommand()) 
    { 
     cmd.Connection = conn; 
     cmd.CommandText = "sp_authenticate"; //name of your procedure 
     cmd.CommandType = CommandType.StoredProcedure; 

     cmd.Parameters.Add("@userid", OracleType.VarChar,50).value=userID; 
     cmd.Parameters.Add("@password", OracleType.VarChar,50).value=pwd; 

     DataTable dt = new DataTable(); 
     OracleDataAdapter adapter = new OracleDataAdapter(cmd); 
     adapter.Fill(dt); 

     if (dt.Rows.Count <= 0) 
     { 
      msg = "Invalid Login ID or Password"; } 
     } 

     return dt; 
    }