对 accdb 的 DataContext 访问答案

【问题标题】：DataContext access to accdb对 accdb 的 DataContext 访问
【发布时间】：2015-01-05 00:00:34
【问题描述】：

我能够使用 WPF 连接到 accdb (Access 2007)。我使用了https://social.msdn.microsoft.com/Forums/vstudio/en-US/92af8085-e9e7-411b-9ab0-52ae0e62942c/binding-to-data-in-an-ms-access-db-wpf-c-xaml?forum=wpf 的信息。

给定：

DataContext = (new _DbTest.DataSet1TableAdapters.PeopleTableAdapter()).GetData();

哪些命令可以让我读取和写入这个 accdb 文件？

【问题讨论】：

标签： wpf ms-access visual-studio-2013

【解决方案1】：

如果 new _DbTest.DataSet1TableAdapters.PeopleTableAdapter() 语句生成 TableAdapter，您可以按照 MSDN 上的文档了解如何获取/插入/更新数据。

这是 MSDN 文档的链接：

TableAdapter Overview

以下是链接中有关如何从 TableAdapter 中提取数据的一些示例代码。

NorthwindDataSet northwindDataSet = new NorthwindDataSet();

NorthwindDataSetTableAdapters.CustomersTableAdapter customersTableAdapter = 
    new NorthwindDataSetTableAdapters.CustomersTableAdapter();

customersTableAdapter.Fill(northwindDataSet.Customers);

您可以继续使用更新/插入命令在数据库中更新或插入行。插入命令的文档可以在这里找到：

How to Update Data using a TableAdapter

关于插入命令的文档可以在这里找到：

How to Insert Data using a TableAdapter

【讨论】：

【解决方案2】：

使用 Access 2007 表 (CustomersTable) 和两个字段（CustomerID、CompanyName），以下 OleDb C# 代码可查找、修改、添加和删除：

using System.Data;
using System.Data.Common;
using System.Data.OleDb;

string connectionString = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\\..\\OleDbExample.accdb";
using (OleDbConnection connection = new OleDbConnection(connectionString))
{
//The connection is automatically closed when the code exits a "using" block.
  using (OleDbCommand command = connection.CreateCommand())
  {
    try
    {
      OleDbDataReader reader;
      connection.Open();

      //Read the database
      command.CommandText = "SELECT ID, CustomerID, CompanyName FROM CustomersTable";
      reader = command.ExecuteReader();
      while (reader.Read())
      {
        string st = reader.GetInt32(0) + "  " + reader.GetInt32(1) + "  " + reader.GetString(2);
        Console.WriteLine(st);
      }
      reader.Close();

      //Add to the database
      command.CommandText = "INSERT INTO CustomersTable(CustomerID, CompanyName) VALUES(?, ?)";
      command.Parameters.Clear();
      command.Parameters.Add("@p1", OleDbType.VarChar).Value = 22;
      command.Parameters.Add("@p2", OleDbType.VarChar).Value = "xyz3";
      command.ExecuteNonQuery();

      //Find a specific value
      command.CommandText = "SELECT CustomerID, CompanyName FROM CustomersTable WHERE CompanyName = @p1";
      command.Parameters.Clear();
      command.Parameters.Add("@p1", OleDbType.VarChar).Value = "Zap";
      reader = command.ExecuteReader();
      reader.Close();

      //Find a similar value
      command.CommandText = "SELECT CustomerID, CompanyName FROM CustomersTable WHERE CompanyName LIKE @p1";
      command.Parameters.Clear();
      command.Parameters.Add("@p1", OleDbType.VarChar).Value = "%Za%";
      reader = command.ExecuteReader();
      reader.Close();

      //Modify an entry
      command.CommandText = "UPDATE CustomersTable SET CompanyName = ? WHERE CompanyName = ?";
      command.Parameters.Clear();
      command.Parameters.Add("@p1", OleDbType.VarChar).Value = "xyz7"; // SET ... final value
      command.Parameters.Add("@p2", OleDbType.VarChar).Value = "xyz3"; // WHERE ... initial value
      command.ExecuteNonQuery();

      //Delete row with ID = 51
      command.CommandText = "DELETE FROM CustomersTable WHERE ID = @p1";
      command.Parameters.Clear();
      command.Parameters.Add("@p1", OleDbType.VarChar).Value = 51;
      command.ExecuteNonQuery();

      //Delete all rows
      command.CommandText = "DELETE * FROM CustomersTable";
      command.ExecuteNonQuery();
    }//try
    catch (Exception ex)
    {
      Console.WriteLine(ex.Message);
    }
    command.Dispose();
    connection.Dispose();
  }//using
}//using

【讨论】：