WebC# C sqlDataReader.Read()导致转换失败错误,c#,sql,type-conversion,sqldatareader,C#,Sql,Type Conversion,Sqldatareader,数据库查询工作正常,并 … WebAn OracleDataReader instance is constructed by a call to the ExecuteReader method of the OracleCommand object. The only properties that can be accessed after the DataReader is closed or has been disposed, are IsClosed and RecordsAffected. To minimize the number of open database cursors, OracleDataReader objects should be explicitly disposed.
C# C sqlDataReader.Read()导致转换失败错误_C#_Sql_Type …
http://www.binaryintellect.net/articles/1a7ab1ca-979c-4177-abcb-1445fcc66f60.aspx WebMay 31, 2007 · The GetOrdinal method of the DataReader provides a way to access data in a type-safe manner. GetOrdinal takes the column name as a parameter, and returns that column's ordinal position. iOrderID = reader.GetOrdinal ("OrderID"); orderIDsList.Items.Add (reader.GetInt32 (iOrderID)); Executing Stored Procedures with a DataReader how to reverse names in excel with comma
c# - 如何通過DataReader / DataTable進行查看? - 堆棧內存溢出
WebJul 9, 2024 · Reading with the DataReader Once the OleDbDataReader is initialize, you can utilize its various methods to read your data records. Foremost, you can use the Read … WebMar 27, 2014 · C# String questionid = string .Empty; Query = "SELECT * FROM AnswersTable WHERE UserId = '1'" ; theReader = conn.ExecuteStatement (Query); while (theReader.Read ()) { questionid += theReader [ "QuestionId" ].ToString () + "," ; } So, this will give you all Ids comma separated. But this is not a good approach. WebJun 7, 2016 · As explained earlier, the SqlDataReader returns data via a sequential stream. To read this data, you must pull data from a table row-by-row Once a row has been read, the previous row is no longer available. To read that row again, you would have to create a new instance of the SqlDataReader and read through the data stream again. how to reverse number