在VB.NET中,读写ACCESS数据库是一个常见的任务,特别是在开发小型到中型企业级应用程序时。本文将详细讲解如何不依赖向导,而是通过ADO.NET语句实现程序化的数据连接和操作,包括读取和写入数据。这不仅提高了代码的灵活性,也增强了安全性,因为我们将使用参数化查询来防止SQL注入。 我们需要引入必要的命名空间,如`System.Data.OleDb`,这是用于处理OLE DB数据提供程序的,ACCESS数据库就是通过OLE DB接口进行访问的: ```csharp Imports System.Data.OleDb ``` 接下来,创建数据库连接字符串是至关重要的。连接字符串包含数据库的路径、数据库类型等信息。对于ACCESS数据库,它可能类似于: ```csharp Dim connectionString As String = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\MyDatabase.accdb;Persist Security Info=False;" ``` 请注意替换`C:\MyDatabase.accdb`为实际数据库文件的路径。 建立连接后,我们可以创建一个`OleDbConnection`对象,并打开连接: ```csharp Dim connection As New OleDbConnection(connectionString) connection.Open() ``` 在写入数据时,我们通常会使用`OleDbCommand`对象来执行SQL命令。例如,要插入一条新记录,可以这样做: ```csharp Dim command As New OleDbCommand("INSERT INTO TableName (Column1, Column2) VALUES (?, ?)", connection) command.Parameters.AddWithValue("@param1", value1) command.Parameters.AddWithValue("@param2", value2) command.ExecuteNonQuery() ``` 这里的`?`是占位符,`AddWithValue`方法用于设置参数值,确保了参数化查询的安全性。 在读取数据时,可以使用`OleDbCommand`执行SELECT语句,然后通过`OleDbDataReader`读取结果: ```csharp command.CommandText = "SELECT * FROM TableName WHERE Column1 = ?" command.Parameters.AddWithValue("@param1", searchValue) Dim reader As OleDbDataReader = command.ExecuteReader() While reader.Read() Dim fieldValue1 As Object = reader(0) ' ... 获取其他列的值 End While reader.Close() ``` `reader(0)`表示读取第一列的数据,你可以根据实际列名或索引进行调整。 对于更复杂的查询,如更新或删除记录,同样可以通过修改SQL语句并使用参数化查询来实现。同时,如果你需要一次性获取大量数据,可以使用`OleDbDataAdapter`和`DataSet`来填充数据集,例如: ```csharp Dim adapter As New OleDbDataAdapter(command) Dim dataSet As New DataSet() adapter.Fill(dataSet, "TableName") ' 现在,dataSet的"TableName"表包含了数据库中的数据 For Each row As DataRow In dataSet.Tables("TableName").Rows Dim column1Value As Object = row("Column1") ' ... 访问其他列 Next ``` 以上就是在VB.NET中使用ADO.NET语句读写ACCESS数据库的基本步骤。这种方法提供了更大的控制力,适用于需要自定义查询逻辑或处理大量数据的情况。记得在操作完成后关闭数据库连接,以释放资源: ```csharp connection.Close() ``` 通过熟练掌握这些技巧,你可以在VB.NET项目中轻松地管理和操作ACCESS数据库,提高代码效率和安全性。
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