**Unigui For Delphi 学习之 使用UniDAC数据库访问控件连接SQL Server数据库**

本文介绍使用Unigui For Delphi和UniDAC数据库访问控件连接SQL Server数据库。作者在RAD Stduio 10.3环境下用Delphi语言学习,因Unigui缺少连接数据库控件而选用UniDAC,还详细说明了创建UniGUi项目及连接数据库的步骤。

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Unigui For Delphi 学习之 使用UniDAC数据库访问控件连接SQL Server数据库

环境:RAD Stduio 10.3
语言:delphi
才开始学习Borland的delphi,在此的基础是会些C/C++ 熟悉的环境是Visual Studio .很多错误欢迎指出,互相学习。

使用UniDAC原因:因为Unigui 虽有如下的一套数据展示控件,但没有连接和访问数据库的控件。
在这里插入图片描述
安装UniDAC的程序中可以在uniGUi项目右下区的控件组里看到UniDAC
在这里插入图片描述
在此基础上,连接SQLServer数据库。我的电脑安装的是SQLServer,书上的是Oracle。UniDAC支持目前很多数据库。
1.首先,New-other-Application Wizard,创建一个UniGUi项目。
在这里插入图片描述
2.MainForm,也就是Main.pas文件中添加一个打开按钮UniBitBtn,如下
在这里插入图片描述3.打开MainModule.pas。如下图所示找到相应的控件
在这里插入图片描述
4.双击MainModule空白处,进入函数OnCreate函数里
在这里插入图片描述这样写。
在这里插入图片描述5.返回之前的Main.pas.双击打开按钮,进入编辑。
在这里插入图片描述在这里插入图片描述6.运行程序F9.
在这里插入图片描述

Universal Data Access Components (UniDAC) is a powerful library of nonvisual cross-database data access components for Delphi, Delphi for .NET, C++Builder, and Free Pascal. The UniDAC library is designed to help programmers develop faster and cleaner cross-database applications. UniDAC is a complete replacement for standard database connectivity solutions and presents an efficient native alternative to the Borland Database Engine and dbExpress for access to Oracle, SQL Server, MySQL, InterBase, Firebird, SQLite, DB2, Microsoft Access, Advantage Database Server, Adaptive Server Enterprise, and other databases (using ODBC provider). UniDAC is based on the well-known Data Access Components from Devart such as ODAC, SDAC, MyDAC, IBDAC, and PgDAC. We have joined the experience of long-term successful development into one great product which provides unified access to popular databases such as Oracle, Microsoft SQL Server, MySQL, InterBase, Firebird, SQLite, DB2, Microsoft Access, Advantage Database Server, Adaptive Server Enterprise, and other databases (using ODBC provider). The UniDAC library is actively developed and supported by Devart Team. If you have questions about UniDAC, email the developers at unidac@devart.com or visit UniDAC online at http://www.devart.com/unidac/. Advantages of UniDAC Technology UniDAC is very convenient in setup and usage. It provides transparent server-independent interface for working with different databases. Selected database provider ensures the best way to perform operations on the server. Universal Data Access UniDAC provides transparent server-independent interfaces for working with different databases, and lets you change the client engine for specific server type just by changing single connection option. It means that you can easily switch between database servers in your cross-database UniDAC-based application. Server-Aware Providers UniDAC chooses the best way specific to the server to perform most operations. Every UniDAC data provider uses server-specific native connectivity. All operations with data are performed by providers automatically considering peculiarities of the selected database server. Optimized Code The goal of UniDAC is to enable developers to write efficient and flexible database applications. The UniDAC library is implemented using advanced data access algorithms and optimization techniques. Classes and components undergo comprehensive performance tests and are designed to help you write high-performance, lightweight data access layers. Compatibility with Other Connectivity Methods The UniDAC interface retains compatibility with standard VCL data access components like BDE. Existing BDE-based applications can be easily migrated to UniDAC and enhanced to take advantage of server-specific features. Development and Support UniDAC is a cross-database connectivity solution that has been actively developed and supported. UniDAC comes with full documentation, demo projects, and fast (usually within one business day) technical support by the UniDAC development team. Find out more about how to get help or submit feedback and suggestions to the UniDAC development team in the Getting Support topic. A description of the UniDAC components is provided in the Component List.
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