扫盲大讲堂:Access的特点及其概念问答
问题: 这里只解决一个问题,到底什么是Access? 设计一个数据库管理系统,用access 在access里面设计好表,查询,然后再用vb做窗体做连接,跟在access里面设计窗体,报表 再调VBA来编代码有什么区别吗 我们是分成几个组做的,但其他人好像没这个意识,我觉得直
问题:
这里只解决一个问题,到底什么是Access?
设计一个数据库管理系统,用access
在access里面设计好表,查询,然后再用vb做窗体做连接,跟在access里面设计窗体,报表 再调VBA来编代码有什么区别吗
我们是分成几个组做的,但其他人好像没这个意识,我觉得直接在access里把一切都作好再调用 vb编码好像 更容易一点
我不明白,MDB到底是什么,假如说SQL是一个后台数据存储库,那ACCESS既是后台又是前台,这么说,SQL和ACCESS同样都可以被调用,那为什么还要SQL呢,ACCESS不是完全可以代替SQL了吗?
MDB 格式文件能否脱离 ACCESS 环境,在未装 ACCESS 的机器上被其他软件调用?
回答:
1、Access是 Microsoft Office 的一个组件,一个前后台结合的数据库“软件”。
也就是说Access既拥有用户界面(VB可以用来开发用户界面);也拥有逻辑、流程处理,即VBA语言(VB也可以用来做逻辑处理);又可以存储数据,即在“表”中存储数据。而所有这些都存储在一个 MDB 格式的文件中(当然,也可以是 MDE 等格式)。
回答上述问题: Access里面设计好界面,VB中必须建立ACCESS.APPLICATION才能调用,也就是说这基本是VBA编程,而不是VB编程。
2、Access不是一种存储格式,是一种软件。
请大家严格区分 Access 软件与 MDB 格式。以下的语句是错误的:“我用VB来开发MIS系统,数据存储在ACCESS中。”。VB下调用 MDB 格式(或 JET DB)只是调用一种格式的文件而已,并没有调用到 Access,其实官方说法叫 “VB 的 JET 应用”。另外,MDB 格式的文件也可以被其他开发工具,比如 DELPHI / PB / C / PHP / ASP / CGI / C# / J# / JAVA / VB.NET / C.NET.... 调用。但是被调用的只是 MDB 文件,很多 ACCESS 软件所具有的功能,这些开发工具是无法调用的。
也正因为如此,类似这样的问题“我的系统中没有安装 OFFICE ACCESS,是否能用 ASP 调用 ACCESS 数据库呢?”,答案是:当然可以,其实你根本没有使用 ACCESS 这个软件,只是使用了 MDB 这种数据库格式,而这种格式只要系统中有 OLE DB 引擎就可以支持。WINDOWS 98 以及以上版本的 WINDOWS 操作系统都内置支持 OLE DB 引擎。
3、Access 中的一些对象可以被 VB 调用,但是必须在调用的机器上安装 ACCESS 这个软件(COPY一个MDB文件是不够的)或者安装额外的 ActiveX 控件
4、这里指的纯 ACCESS 环境就是指没有使用任何其他软件,直接使用 ACCESS 界面以及存储格式的环境,也就是不能脱离 ACCESS 运行时的环境。上面说的 ASP + MDB / VB + MDB 等等都不是所谓的“纯 ACCESS 环境”。因此上述环境中出现的问题基本与 ACCESS 这个软件毫无关系。
5、“我不明白,MDB到底是什么”,回答上述问题:MDB 是一种文件格式,其中的数据以特定方式组织起来,而 ACCESS 这种软件的默认存储格式正好是 MDB
6、“假如说SQL是一个后台数据存储库,那ACCESS既是后台又是前台”,
回答上述问题: SQL 是“结构化查询语言”,请不要与 SQL SERVER 这种数据库软件混淆。SQL SERVER 是一种数据库软件,但是他没有“最终用户”界面,只有适合于开发者使用的界面,开发者可以使用其他编程工具来开发界面,比如用 VB VB.NET 等;而 ACCESS 这个软件本身就具有开发者使用的界面和适合于“最终用户”的界面,也就是我们通常说的前后台结合。
7、“那ACCESS既是后台又是前台,这么说,SQL和ACCESS同样都可以被调用,那为什么还要SQL呢,ACCESS不是完全可以代替SQL了吗”,
回答上述问题:请先参考回答3,ACCESS 的功能和 SQL SERVER 不同所以并不冲突,具体有什么不同请自行参考 ACCESS 的“帮助”以及 SQL SERVER 的“联机丛书”
8、“MDB 格式文件能否脱离 ACCESS 环境,在未装 ACCESS 的机器上被其他软件调用?”
回答上述问题:可以,这是因为有 JET DB 的支持,而 WINDOWS 98 以上默认就内置了 JET DB ,就像 98 以上的机器默认就可以浏览网页,而 windows 95 的机器必须安装浏览器才能浏览网页一个道理。
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