本文简单介绍了Delphi7连接MySQL数据库的实现方法，具体步骤如下：
首先先去下载：http://www.justsoftwaresolutions.co.uk/delphi/dbexpress_and_mysql_5.html
然后将下载到的dbxopenmysql5_dll.zip解压出来，再把dbxopenmysql50.dll和libmysql.dll都放到工程文件夹下。
在Form上放上TSQLConnection、TSQLQuery、TStringGrid、3个TButton、TLable。
添加如下代码：
unit Unit1;
interface
uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, DBXpress, FMTBcd, StdCtrls, Grids, DB, SqlExpr;
type
TForm1 = class(TForm)
SQLConnection1: TSQLConnection;
SQLQuery1: TSQLQuery;
StringGrid1: TStringGrid;
Button1: TButton;
Button2: TButton;
Button3: TButton;
Label1: TLabel;
procedure Button1Click(Sender: TObject);
procedure Button2Click(Sender: TObject);
procedure Button3Click(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;
var
Form1: TForm1;
implementation
{$R *.dfm}
procedure TForm1.Button1Click(Sender: TObject);
begin
SQLConnection1 := TSQLConnection.Create(nil);
SQLConnection1.DriverName := 'dbxmysql';
SQLConnection1.GetDriverFunc := 'getSQLDriverMYSQL50';
SQLConnection1.LibraryName := 'dbxopenmysql50.dll';
SQLConnection1.VendorLib := 'libmysql.dll';
SQLConnection1.LoginPrompt := false;
SQLConnection1.Params.Append('Database=mysql');
SQLConnection1.Params.Append('User_Name=root');
SQLConnection1.Params.Append('Password=');
SQLConnection1.Params.Append('HostName=localhost');
SQLConnection1.Open;
if SQLConnection1.Connected = true then
begin
SQLQuery1.SQLConnection := SQLConnection1;
Label1.Caption := 'success!';
end
else
Label1.Caption := 'failed!';
end;
procedure TForm1.Button2Click(Sender: TObject);
var
i, j: Integer;
begin
SQLQuery1.SQL.Clear;
SQLQuery1.SQL.Add('SELECT * FROM user');
SQLQuery1.Active := true;
i := 0;
SQLQuery1.First;
while not SQLQuery1.eof do
begin
for j := 0 to SQLQuery1.FieldCount - 1 do
StringGrid1.cells[j, i] := SQLQuery1.Fields[j].AsString;
SQLQuery1.next;
inc(i);
end;
SQLQuery1.Active := false;
end;
procedure TForm1.Button3Click(Sender: TObject);
begin
if SQLConnection1.Connected = true then
SQLConnection1.Close;
SQLConnection1.Free;
end;
end.
经测试，可实现正常连接与查询。
