OleDbDataReader 对象无法读取文件

Posted 2023-03-24

【中文标题】OleDbDataReader 对象无法读取文件

【英文标题】：OleDbDataReader object cannot read the file

【发布时间】：2014-10-15 12:05:38

【问题描述】：

我开发了一个功能，将 Excel 工作表导入表格。但是当我上传文件并单击按钮导入时。该代码不起作用，并给了我下面提到的错误。我尝试使用 DataAdapter，但这也不起作用。请看下面的错误：-

Microsoft Office Access 数据库引擎找不到对象 'TableName'。确保对象存在并且您拼写它 名称和路径名正确。

另外，请参阅代码以供参考：-

 private void ImporttoSQL(string sPath)
  
    string sSourceConstr1 = string.Format(@"Provider=Microsoft.Jet.OLEDB.4.0; Data Source=C:\AgentList.xls; Extended Properties=""Excel 8.0;HDR=YES;""", sPath);
    string sSourceConstr = string.Format(@"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=0;Extended Properties=""Excel 12.0 Xml;HDR=YES;""", sPath);
    OleDbConnection sSourceConnection = new OleDbConnection(sSourceConstr);
    using (sSourceConnection)
    
        string sql = string.Format("Select [Merchant_Name],[Store_Name],[Store_Address],[City] FROM [MerchantTempDetail]", "Sheet1$");
        OleDbCommand command = new OleDbCommand(sql, sSourceConnection);
        sSourceConnection.Open();
        conn.Open();
        using (OleDbDataReader dr = command.ExecuteReader())
        
            using (SqlBulkCopy bulkCopy = new SqlBulkCopy(conn))
            
                bulkCopy.DestinationTableName = "MerchantTempDetail";
                //You can mannualy set the column mapping by the following way.
                //  bulkCopy.ColumnMappings.Add("Mini_Category_Id", "Mini_Category_Id");
                //bulkCopy.ColumnMappings.Add("CategoryId", "CategoryId");
                bulkCopy.ColumnMappings.Add("Merchant_Name", "Merchant_Name");
                bulkCopy.ColumnMappings.Add("Store_Name", "Store_Name");
                bulkCopy.ColumnMappings.Add("Store_Address", "Store_Address");
                bulkCopy.ColumnMappings.Add("City", "City");
                bulkCopy.WriteToServer(dr);
            
        
    

编辑代码：-

 public static void ExcelToSqlServerBulkCopy()

    // Connection String to Excel Workbook
    // Jet4
    string excelConnectionString = @"Provider=Microsoft.Jet.OLEDB.4.0; Data Source=AgentList.xls; Extended Properties=""Excel 8.0;HDR=YES;""";
    // Ace Ole db 12
    string excelAceOleDb12ConnectionString = @"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=AgentList.xls;Extended Properties=""Excel 8.0;HDR=YES;""";

    // Create Connection to Excel Workbook
    using (OleDbConnection connection = new OleDbConnection(excelAceOleDb12ConnectionString))
    
        OleDbCommand command = new OleDbCommand("Select [Merchant_Name],[Store_Name],[Store_Address],[City] FROM [Sheet1$]", connection);
        // open excel
        connection.Open();
        // Create DbDataReader to Data Worksheet
        using (DbDataReader dr = command.ExecuteReader())
        
            // SQL Server Connection String
            string sqlConnectionString = ConfigurationManager.ConnectionStrings["DefaultSQLConnectionString"].ConnectionString;
            // Bulk Copy to SQL Server
            using (SqlBulkCopy bulkCopy = new SqlBulkCopy(sqlConnectionString))
            
                bulkCopy.DestinationTableName = "MerchantTempDetail";
                bulkCopy.WriteToServer(dr);
            
        
    


protected void btnImport_Click(object sender, EventArgs e)

    if (FileUpload1.HasFile)
    
        string sPath = Server.MapPath(FileUpload1.FileName);
        FileUpload1.SaveAs(sPath);

        ExcelToSqlServerBulkCopy();
    

【问题讨论】：

您的SqlBulkCopy 在与conn 连接的数据库中搜索MerchantTempDetail。但我没有看到它的定义。我只将sSourceConnection 视为OleDbConnection，它连接在您的sPath 路径中。

所以，你的意思是说，我应该叫 (dr) 代替 (conn) 工作？

【参考方案1】：

您需要定义 2 个连接，一个用于 Excel 源，另一个用于 sql 数据库您要批量复制到。 （此代码已测试）如果您需要复制到内存数据表，请使用此example on MSDN。

public static void ExcelToSqlServerBulkCopy ()

  // Connection String to Excel Workbook
  // Jet4
  string excelConnectionString = @"Provider=Microsoft.Jet.OLEDB.4.0; Data Source=AgentList.xls; Extended Properties=""Excel 8.0;HDR=YES;""";
  // Ace Ole db 12
  string excelAceOleDb12ConnectionString = @"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=AgentList.xls;Extended Properties=""Excel 8.0;HDR=YES;""";

  // Create Connection to Excel Workbook
  using (OleDbConnection connection = new OleDbConnection(excelAceOleDb12ConnectionString))
  
    OleDbCommand command = new OleDbCommand("Select [Merchant_Name],[Store_Name],[Store_Address],[City] FROM [AgentList$]", connection);
    // open excel
    connection.Open ();        
    // Create DbDataReader to Data Worksheet
    using (DbDataReader dr = command.ExecuteReader ())
    
      // SQL Server Connection String
      string sqlConnectionString = @"Data Source=.\SQLEXPRESS;Initial Catalog=***;Integrated Security=True";
      // Bulk Copy to SQL Server
      using (SqlBulkCopy bulkCopy = new SqlBulkCopy (sqlConnectionString))
      
        bulkCopy.DestinationTableName = "Q26382169";
        bulkCopy.WriteToServer (dr);
      
    
  

上面使用变量名的非常重要的细节：

必须先创建要复制到的数据库 (***)。 目标表 (Q26382169) 必须存在于该数据库中，DDL 无关紧要，与 Excel 文件的列相同。 由于您使用的是 HDR=YES 选项，因此 Excel 工作表的第一行必须包含指定的列名：Merchant_Name、Store_Name、Store_Address、City（不带 []） OleDbCommand (AgentList$) 中工作表的名称

【讨论】：

我添加了我的更改，但它给了我这样的错误：“Microsoft Office Access 数据库引擎无法打开或写入文件''。它已经被另一个用户以独占方式打开，或者您需要获得查看和写入其数据的权限。”在线：connection.Open();查看我的更新代码

【参考方案2】：

终于通过调试解决了。

 private void ImporttoSQL(string sPath)

    string sSourceConstr1 = string.Format(@"Provider=Microsoft.Jet.OLEDB.4.0; Data Source=C:\AgentList.xls; Extended Properties=""Excel 8.0;HDR=YES;""", sPath);
    string sSourceConstr = string.Format(@"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=0;Extended Properties=""Excel 12.0 Xml;HDR=YES;""", sPath);

    //   string sSource = string.Format(@"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + sPath + ";Extended Properties=Excel 8.0", sPath);

    // string sDestConstr = ConfigurationManager.ConnectionStrings["DBConnection"].ConnectionString;
    OleDbConnection sSourceConnection = new OleDbConnection(sSourceConstr);
    using (sSourceConnection)
    
        SqlConnection conn = new SqlConnection(System.Configuration.ConfigurationManager.ConnectionStrings["DefaultSQLConnectionString"].ConnectionString);
        string sql = "Select [Merchant_Name],[Store_Name],[Store_Address],[City] FROM [Sheet1$]";
        OleDbCommand command = new OleDbCommand(sql, sSourceConnection);
        sSourceConnection.Open();
        conn.Open();
        using (OleDbDataReader dr = command.ExecuteReader())
        
            using (SqlBulkCopy bulkCopy = new SqlBulkCopy(conn))
            
                bulkCopy.DestinationTableName = "MerchantTempDetail";
                bulkCopy.ColumnMappings.Add("Merchant_Name", "Merchant_Name");
                bulkCopy.ColumnMappings.Add("Store_Name", "Store_Name");
                bulkCopy.ColumnMappings.Add("Store_Address", "Store_Address");
                bulkCopy.ColumnMappings.Add("City", "City");
                 bulkCopy.WriteToServer(dr);