Java讀取數(shù)據(jù)庫需要哪些步驟？動(dòng)力節(jié)點(diǎn)小編來告訴大家。

Java讀取數(shù)據(jù)庫中的元素

1.首先創(chuàng)建Connection對(duì)象

2.創(chuàng)建Statement對(duì)象

3.將結(jié)果存到ResultSet對(duì)象中

4.對(duì)所的結(jié)果對(duì)象進(jìn)行迭代取出

使用步驟

String sql="select * "
		+ "from yaopinzidian "; //創(chuàng)建一條sql語句
database con =new database();//加載數(shù)據(jù)庫驅(qū)動(dòng)，連接數(shù)據(jù)庫
con.connect();
Statement state;//創(chuàng)建一個(gè)Statement對(duì)象
Vector<Vector<String>> data=new Vector<Vector<String>>();
Vector<String> temp=new Vector<String>();
Vector<String> temp2=new Vector<String>();
try {
	state = con.conn.createStatement();
	ResultSet rs=state.executeQuery(sql);//執(zhí)行相應(yīng)的sql語句，將查詢結(jié)果保存到ResultSet中
	while(rs.next()) {//將rs進(jìn)行迭代，類似于迭代器，行指針
		for(int i=1;i<=n;i++) {
			temp.add(rs.getString(i));//取出每行的每列元素
		}
		temp2=new Vector<String>(temp);
		data.add(temp2);
		temp.clear();
	}
	con.conn.close();//關(guān)閉數(shù)據(jù)庫
} catch (SQLException e) {
	e.printStackTrace();
	}
return data;