Delphi 7连接MySql 5.5.15
1.ODBC方式必须要先有MySql的ODBC驱动,我下载的是全安装版,包括MySql服务器、各种所支持的连接、工作台、示例数据库、文档,若是无ODBC驱动,可以到官网http://dev.mysql.com/downloads/connector/odbc/下载。
①数据源方式
首先,确认安装了MySql的ODBC驱动,打开“控制面板”→“管理工具”→“数据源”,切换到“驱动程序”页,查看“MySql ODBC 5.1 Driver",如下图所示:

切换到"系统DSN"→"添加"→"MySql ODBC 5.1 Driver",如下图所示:

弹出MySql数据源配置,数据源名称随意,TCP/IP Server为数据库地址,User用户名,Password密码,Database连接的数据库,点"Test"进行测试连接,如下图所示:

点击"OK"后,即可看到新增加了一个数据源。打开Delphi 7,在窗体上放置TADOConnection、TADOQuery、TDataSource和TDBGrid,相互之间关联,配置TADOConnection的连接字符串,"提供程序"选择"Microsoft OLE DB Provider for ODBC Drivers",下一步,选择"使用数据源名称",下拉选择刚才配置的数据源,其他的不用再填写,测试连接,如下图所示:

②驱动方式
跟上面一样,先确认安装MySql的ODBC驱动。打开Delphi 7,在窗体上放置TADOConnection、TADOQuery、TDataSource和TDBGrid,相互之间关联,配置TADOConnection的连接字符串,为以下内容:
1 Driver={MySQL ODBC 5.1 Driver}; Server=127.0.0.1; Database=world; User=root; Password=a123; Option=3; 在TADOQuery写查询语句,设置Active为True,数据都显示在表格上,如下图所示:

2.ZeosLib方式
ZeosLib是一个用于Borland开发工具的数据库中间件,包括Delphi、C++ Builder和Kylix。从http://sourceforge.net/projects/zeoslib/files/下载"ZEOSDBO-6.6.6-stable"版本,解压到文件夹。打开Delphi 7,加载工程项目包".../ZEOSDBO/packages/delphi7/ZeosDbo.bpg",按顺序编译,或者右键选择"Compile All From Here",如下图所示:

编译完成后,再选择"ZComponentDesign.bpl",右键选择"Install",安装组件成功,弹出如下对话框:

再添加所编译完成的目录,即".../ZEOSDBO/packages/delphi7/build",菜单"Tools"→"Environment Options"→"Library"→"Library path",添加此目录。另外,若需要在编写代码时,能进入ZeosLib源代码的话,需要添加源代码文件夹目录,包括:".../ZEOSDBO/src/core"、".../ZEOSDBO/src/parsesql"、".../ZEOSDBO/src/plain"、".../ZEOSDBO/src/dbc"和".../ZEOSDBO/src/component"(注意:会在这些目录下再次编译单元文件)。
新建一个应用程序,在窗体上放置TZConnection、TZQuery、TDataSource和TDBGrid,在窗体创建函数里,写入以下代码:
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19 procedure TForm1.FormCreate(Sender: TObject);
begin
//---------------互相关联------------------------
zqry1.Connection := zcon1;
ds1.DataSet := zqry1;
dbgrd1.DataSource := ds1;
//---------------设置参数------------------------
zcon1.Protocol := 'mysql';
zcon1.Port := 3306;
zcon1.HostName := '127.0.0.1';
zcon1.User := 'root';
zcon1.Password := 'a123';
zcon1.Database := 'world';
zcon1.Connected := True;
//---------------查询显示------------------------
zqry1.Close;
zqry1.SQL.Text := 'SELECT * FROM City';
zqry1.Active := True;
end; 当然手动在设计器上进行设置也可以。因为这里连接的是MySql数据库,需要拷贝MySql数据库客户端所需的DLL(即:libmysql.dll,这里我安装的是在".../MySQL/MySQL Server 5.5/lib"里面)复制到Windows系统目录(通常是"C:/WINDOWS/system32")或者工程目录下。程序如下图所示:

当程序发给别人使用时,需要连同"libmysql.dll"一起发送。若是显示的数据有乱码,这是因为MySQl数据库默认使用UTF-8字符集,则先在查询之前,设置字符集,如下代码所示:
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7 begin
zqry1.Close;
zqry1.SQL.Text := 'set names gbk';
zqry1.ExecSQL;
zqry1.SQL.Text := 'select * from city';
zqry1.Active := True;
end;
或者在TZConnection的Properties属性添加"codepage=gbk"。
3.其他方式
另外,还有其他的第三方控件可以连接MySql等其他数据库,如:AnyDAC、MyDAC 、DAC for MySQL等等。
扩展资料:1.MySQL with Delphi http://delphi.about.com/od/mysql/MySQL_with_Delphi.htm
2.Zeoslib Portal :: Home http://zeos.firmos.at/
3.使用ZeosDbo元件

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MySQL is suitable for beginners to learn database skills. 1. Install MySQL server and client tools. 2. Understand basic SQL queries, such as SELECT. 3. Master data operations: create tables, insert, update, and delete data. 4. Learn advanced skills: subquery and window functions. 5. Debugging and optimization: Check syntax, use indexes, avoid SELECT*, and use LIMIT.

MySQL efficiently manages structured data through table structure and SQL query, and implements inter-table relationships through foreign keys. 1. Define the data format and type when creating a table. 2. Use foreign keys to establish relationships between tables. 3. Improve performance through indexing and query optimization. 4. Regularly backup and monitor databases to ensure data security and performance optimization.

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