使用C＃讀取Excel

Question

我正在嘗試使用C＃讀取Excel文件，並且不斷收到此錯誤： oledbexception cannot update. database or object is read-only oledbexception cannot update. database or object is read-only在行上oledbexception cannot update. database or object is read-only 。 有任何想法嗎？

        string connStr = ConfigurationManager.ConnectionStrings["SiteSqlServer"].ConnectionString;
        SqlConnection conn = new SqlConnection(connStr);
        //file upload path

        string path = FileUpload1.PostedFile.FileName;
        //Create connection string to Excel work book
        string excelConnectionString = @"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + FileUpload1.PostedFile.FileName + ";Extended Properties=\"Excel 8.0;HDR=Yes;IMEX=1\"";
        //Create Connection to Excel work book
        OleDbConnection excelConnection = new OleDbConnection(excelConnectionString);
        //Create OleDbCommand to fetch data from Excel
        OleDbCommand cmd = new OleDbCommand("Select [Coupon], [First Name], [Last Name] from [Sheet1$]",excelConnection);
        excelConnection.Open();
        OleDbDataReader dReader;
        dReader = cmd.ExecuteReader();
        SqlBulkCopy sqlBulk = new SqlBulkCopy(conn);
        //Give your Destination table name
        sqlBulk.DestinationTableName = "CPC_Coupons";
        sqlBulk.WriteToServer(dReader);
        excelConnection.Close();

謝謝！

Answer 1

這是我的方法，適用於在Excel 2007中創建的工作表。

public static DataTable ReadExcel(string path)
{
    //create a DataTable to hold the query results
    DataTable dTable = new DataTable();

    try
    {
        if (!File.Exists(path))
            return null;

        //create the "database" connection string 
        string connString = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + path + ";Extended Properties=Excel 12.0;";

        //create the database query
        string query = "SELECT * FROM [Sheet1$]" ;

        //create an OleDbDataAdapter to execute the query
        OleDbDataAdapter dAdapter = new OleDbDataAdapter(query, connString);
        //fill the DataTable
        dAdapter.Fill(dTable);
        dAdapter.Dispose();
    }
    catch (Exception e)
    {
        Console.WriteLine(e);
    }

    return dTable;
}

Answer 2

您需要像這樣從ConnectionStrings更改connectionstring

正如在MS Support網站上有關此ADO.net和Excel的文章

 string FileName = GettheFileName; 
string excelConnectionString = @"Provider=Microsoft.Jet.OLEDB.4.0;Data Source="+FileName+";Extended Properties="Excel 8.0;HDR=Yes;IMEX=1";

從MS支持網站ADO.net與Excel

若要解決只讀數據的此問題，請通過使用連接字符串的“擴展屬性”部分中的設置“ IMEX = 1”來啟用導入模式。 這將強制ImportMixedTypes = Text注冊表設置。

PS：如果沒有列標題，則需要在連接字符串中指定HDR = No

Answer 3

不要簡單地...

確保已在Excel中關閉該文檔（Excel對其具有只讀共享鎖-我認為已經有一段時間了）

如果嘗試在服務器環境中使用Interop，可能會給您帶來問題-COM權限等。

我可能還會建議使用using塊來確保執行后一切都被處置：

using(OleDbConnection excelConnection = new OleDbConnection(excelConnectionString)) {
  //Create OleDbCommand to fetch data from Excel
  OleDbCommand cmd = new OleDbCommand("Select [Coupon]\t[First Name]\t[Last Name] from [Sheet1$]",excelConnection);
  excelConnection.Open();
...
  excelConnection.Close();
}

Answer 4

如果這可能對您的情況有所幫助，請參見以下代碼：

  public static class DatabaseManager
    {
        //set connection string for SQL Server Express Edition
        static string connString = @"Data Source=LOCALHOST\SQLEXPRESS;Initial Catalog=DocumentStore;Integrated Security=True;Pooling=False";


        //method to save document to database
        public static bool SaveDocumentToDatabase(MemoryStream msDocument, DocumentType docType, string documentName)
        {
            //keep track of the save status 
            bool isSaved = false;

            //create database connection
            SqlConnection sqlConnection = new SqlConnection(connString);
            try
            {
                sqlConnection.Open();
            }
            catch (Exception ex)
            {
                Settings.LogException(ex);
                Console.WriteLine("Unable to open database connection");
                isSaved = false;
            }

            string commandText = "INSERT INTO Documents (DocumentType, DocumentName, DocumentContent, CreateDate) VALUES('" + docType + "','" + documentName + "', @DocumentContent ,'" + DateTime.Now + "')";
            SqlCommand sqlCommand = new SqlCommand(commandText, sqlConnection);
            sqlCommand.Parameters.AddWithValue("DocumentContent", msDocument.ToArray());
            try
            {
                sqlCommand.ExecuteNonQuery();
                Console.WriteLine("Document saved successfully");
                isSaved = true;
            }
            catch(Exception ex)
            {
                Console.WriteLine("Unable to save the document to database");
                Settings.LogException(ex);
                isSaved = false;
            }

            //close database connect
            sqlConnection.Close();


            return isSaved;
        }

    public static bool LoadDocumentFromDataBase(DocumentType docType)
    {
         //keep track of the retrieve status 
        bool isRetrieved = false;


        //create database connection
        SqlConnection sqlConnection = new SqlConnection(connString);
        try
        {
            sqlConnection.Open();
        }
        catch(Exception ex)
        {
            Console.WriteLine("Unable to open database connection");
            Settings.LogException(ex);
            isRetrieved = false;
        }


        string commandText = "SELECT * FROM Documents WHERE DocumentType ='" + docType + "'";

        SqlDataAdapter sqlDataAdapter = new SqlDataAdapter(commandText, sqlConnection);
        SqlCommand sqlCommand = new SqlCommand(commandText, sqlConnection);

        DataTable dtDocuments = new DataTable();

        try
        {
            sqlDataAdapter.Fill(dtDocuments);
            Console.WriteLine("Document retrieved successfully");
            isRetrieved = true;
        }
        catch(Exception ex)
        {
            Console.WriteLine("Unable to retrieve documents from database");
            Settings.LogException(ex);
            isRetrieved = false;
        }
   }
}

Answer 5

string fileName = @"C:\Users\janki.prashar\Desktop\k.xls";
    string ConStr = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + fileName + ";Extended     Properties=\"Excel 8.0;HDR=NO;IMEX=1\"";
    OleDbConnection con = new OleDbConnection(ConStr);
    con.Open();
    OleDbCommand ad = new OleDbCommand("select * from [SheetName$]", con);
    OleDbDataReader dr = ad.ExecuteReader();
    System.Data.DataTable dt = new System.Data.DataTable();
    dt.Load(dr);
    dataGridView1.DataSource = dt;
    con.Close();