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lazarus mysql

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。