This article briefly introduces the implementation method of Delphi7 connecting to MySQL database. The specific steps are as follows:
First download it: http://www.justsoftwaresolutions.co.uk/delphi/dbexpress_and_mysql_5.html
Then unzip the downloaded dbxopenmysql5_dll.zip, and put both dbxopenmysql50.dll and libmysql.dll into the project folder.
Put TSQLConnection, TSQLQuery, TStringGrid, 3 TButtons, and TLable on the Form.
Add the following code:
unit Unit1;interfaceuses 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.After testing, normal connection and query can be achieved.