Lazarus是一款十分便捷的免費(fèi)開(kāi)源的IDE,其設(shè)計(jì)目的是為了開(kāi)發(fā)跨平臺(tái)的應(yīng)用程序。而MySQL則是一款開(kāi)源免費(fèi)的關(guān)系型數(shù)據(jù)庫(kù)管理系統(tǒng),在眾多的數(shù)據(jù)庫(kù)管理系統(tǒng)中MySQL是占據(jù)了極高的市場(chǎng)份額。
Lazarus集成了各種數(shù)據(jù)庫(kù)的連接,其中就包括MySQL數(shù)據(jù)庫(kù)的連接。連接MySQL數(shù)據(jù)庫(kù)需要使用FPC MySQL連接庫(kù)。
//連接MySQL數(shù)據(jù)庫(kù) uses mysqldb; procedure TForm1.Button1Click(Sender: TObject); var AConnection: TMySQL55Connection; begin AConnection:=TMySQL55Connection.Create(nil); AConnection.HostName:='localhost'; AConnection.DatabaseName:='testdb'; AConnection.UserName:='root'; AConnection.Password:='123456'; AConnection.Open; AConnection.Close; AConnection.Free; end;
連接MySQL數(shù)據(jù)庫(kù)后,就可以對(duì)其進(jìn)行操作,包括插入數(shù)據(jù)、刪除數(shù)據(jù)、查詢數(shù)據(jù)等等操作。下面舉例介紹如何向MySQL數(shù)據(jù)庫(kù)中插入數(shù)據(jù)。
//向MySQL數(shù)據(jù)庫(kù)中插入數(shù)據(jù) uses mysqldb, db; procedure TForm1.Button2Click(Sender: TObject); var AConnection: TMySQL55Connection; ATransaction: TSQLTransaction; AQuery: TSQLQuery; begin AConnection:=TMySQL55Connection.Create(nil); AConnection.HostName:='localhost'; AConnection.DatabaseName:='testdb'; AConnection.UserName:='root'; AConnection.Password:='123456'; AConnection.Open; ATransaction:=TSQLTransaction.Create(nil); ATransaction.Database:=AConnection; AQuery:=TSQLQuery.Create(nil); AQuery.Database:=AConnection; AQuery.Transaction:=ATransaction; ATransaction.StartTransaction; AQuery.SQL.Text:='INSERT INTO users(id,name,age) VALUES(3,''John'',30)'; AQuery.ExecSQL; ATransaction.Commit; AQuery.Close; ATransaction.Free; AQuery.Free; AConnection.Close; AConnection.Free; end;
通過(guò)以上代碼示例,使用Lazarus連接MySQL數(shù)據(jù)庫(kù)并向其中插入數(shù)據(jù),能夠幫助開(kāi)發(fā)者更好地理解Lazarus和MySQL的連接和操作,提升開(kāi)發(fā)效率。