如何在 vb.net 中创建设置？？举例说明

发布于 2024-10-02 13:40:46 字数 382 浏览 1 评论 0原文

cn = New OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data source=C:\solutionvs10\test\test\bin\Debug\db2.mdb;**Jet OLEDB:Database Password=secret**")

cn.Open()
''# codes
cn.Close()

我用的是VS 2010 上面是我的代码......你可以看到它是Ms Access DataBase......（密码保护）我如何创建一个设置......可以轻松安装其他计算机......

我可以创建这样的设置吗？？

原文

cn = New OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data source=C:\solutionvs10\test\test\bin\Debug\db2.mdb;**Jet OLEDB:Database Password=secret**")

cn.Open()
''# codes
cn.Close()

I used V S 2010
The above is my code......u can see that it is Ms Access DataBase....(password protection)
How i can create a setup .....that can be easy to install other computer.........

Can i Create such a setup ???

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昨迟人 2024-10-09 13:40:46

首先，您发布的这段代码是错误的：

cn = New OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data source=C:\solutionvs10\test\test\bin\Debug\db2.mdb;**Jet OLEDB:Database Password=secret**")

cn.Open()
''# codes
cn.Close()

错误的原因是您无法保证关闭数据库连接，最终导致应用程序无法访问数据库的状态。这在您的开发测试中不会发生，因为此类测试往往是短暂的，但它会发生在您的用户身上，他们倾向于让应用程序运行更长的时间。

现在，我知道您在想，“是的，我正在关闭我的连接。您没有看到 cn.Close() 吗？”是的，我看到了。但这还不够好。有几种情况（例外是最重要的）可能导致此代码无法运行。编写这段代码的正确方法是这样的：

cn = New OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data source=C:\solutionvs10\test\test\bin\Debug\db2.mdb;**Jet OLEDB:Database Password=secret**")
Try
    cn.Open()
    ''# codes
Finally
    cn.Close()
End Try

VB.Net 中有一个简写语法，如下所示：

Using cn = New OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data source=C:\solutionvs10\test\test\bin\Debug\db2.mdb;**Jet OLEDB:Database Password=secret**")  
    cn.Open()
    ''# codes
End Using ''# No need to call .Close() any more, the Using structure takes care of it

现在，讨论实际的部署问题。

您需要将安装项目添加到保存应用程序项目的同一解决方案中。然后，您应该能够使用主项目的输出作为安装项目的包，并将初始数据库文件作为内容资源包含在内。安装项目中不需要包含任何其他内容； Windows 包含开箱即用的 Access 使用的 Jet 数据库引擎。您可能需要花一些时间确保适当的 .Net 框架运行时将作为依赖项安装（如果需要）。

First of all, this code you posted is wrong:

cn = New OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data source=C:\solutionvs10\test\test\bin\Debug\db2.mdb;**Jet OLEDB:Database Password=secret**")

cn.Open()
''# codes
cn.Close()

The reason it's wrong is because you're not guaranteed to close your database connections, eventually leading to a state where your database is not accessible to your application. This won't happen in your development testing, because such tests tend to be short-lived, but it will happen to your users, who tend the keep applications running over longer periods of time.

Now, I know you're thinking, "Yes, I am closing my connections. Don't you see the cn.Close()?" Yes, I see it. But that's not good enough. There are a few cases (exceptions are the big one) that can cause this code not to run. The correct way to write this code is like this:

cn = New OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data source=C:\solutionvs10\test\test\bin\Debug\db2.mdb;**Jet OLEDB:Database Password=secret**")
Try
    cn.Open()
    ''# codes
Finally
    cn.Close()
End Try

And there's a short-hand syntax in VB.Net that looks like this:

Using cn = New OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data source=C:\solutionvs10\test\test\bin\Debug\db2.mdb;**Jet OLEDB:Database Password=secret**")  
    cn.Open()
    ''# codes
End Using ''# No need to call .Close() any more, the Using structure takes care of it

Now, on to the actual deployment question.

You need to add a setup project to the same solution that holds your application project. You should then be able to use the output of your main project as the package for the setup project and include your initial database file as a content resource. There is no need for anything else included in the setup project; Windows includes the Jet database engine used by access out of the box. You may want to spend some time making sure that the appropriate .Net framework runtime will be installed as a dependency if needed as well.

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空城之時有危險 2024-10-09 13:40:46

正如威尔指出的，将 .mdb 文件包含到您的项目中可能就是您正在寻找的。您可以在项目管理器中执行此操作，然后调整属性，以便将文件发布到应用程序文件夹（复制到输出目录 = 始终复制）。

在代码中，您应该引用数据库，

cn = New OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data source=" & My.Application.Info.DirectoryPath & "\db2.mdb;**Jet OLEDB:Database Password=secret**")

因为您不知道数据库在客户端计算机上的安装路径。

另一方面，您可能需要确保将应用程序发布为 32 位应用程序，因为 Jet4.0 不适用于 64 位应用程序（请参阅 http://connect.microsoft.com/VisualStudio/feedback/details/123311/win-xp-x64-jet-v4 -0)

As Will pointed out including the .mdb file into your project is probably what you are looking for. You can do it in the project manager and then adjusting the properties so that the file is published to the application folder (Copy to Output Directory = Copy Always).

In the code, you should then refer to the database as

cn = New OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data source=" & My.Application.Info.DirectoryPath & "\db2.mdb;**Jet OLEDB:Database Password=secret**")

since you don't know the installation path of your database on the client's computer.

On the other side you might want to make sure that you publish your application as a 32bits application since the Jet4.0 does not work for 64bits applications (see http://connect.microsoft.com/VisualStudio/feedback/details/123311/win-xp-x64-jet-v4-0)

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