Java 投票(自動(dòng)加一)

數(shù)據(jù)庫(kù)建立：

SQL> create table vote(

2 id number,

3 name varchar(200),

4 num number

5 );

//index.jsp

pageEncoding="utf-8"%>

投票

Connection conn1 = null;

Statement stmt1 = null;

ResultSet rs1 = null;

try {

Class.forName("oracle.jdbc.driver.OracleDriver").newInstance();

conn1 = DriverManager.getConnection(

"jdbc:oracle:thin:@localhost:1521:orcl", "zhang",

"zhang");

stmt1 = conn1.createStatement();

String url = "select * from vote order by id desc";

rs1 = stmt1.executeQuery(url);

while (rs1.next()) {

out.print(rs1.getString("name")+":");

%>

" >支持

out.print("
");

}

} catch (Exception e) {

e.printStackTrace();

} finally {

try {

if (rs1 != null) {

rs1.close();

}

if (stmt1 != null) {

stmt1.close();

}

if (conn1 != null) {

conn1.close();

}

} catch (Exception e) {

e.printStackTrace();

}

}

%>

//turn.jsp

pageEncoding="utf-8"%>

turn

//int add = 1;

Connection conn = null;

Statement stmt = null;

ResultSet rs = null;

String myid = request.getParameter("id");

//if ("".equals(myid) || myid == null) {

//out.println("您如果對(duì)感興趣的話，請(qǐng)?zhí)顚?#xff01;");

//out.print("
");

//} else {

Boolean flag = false;

try {

Class.forName("oracle.jdbc.driver.OracleDriver").newInstance();

conn = DriverManager.getConnection(

"jdbc:oracle:thin:@localhost:1521:orcl", "zhang",

"zhang");

stmt = conn.createStatement();

int addl = Integer.valueOf(myid);

//++addl;

//String lid=addl+"";

String url = "update vote set num=num+1 where id=" + myid + "";

//String url = "update adder set num=num+1 where id=" + myid + "";

//out.print("url"+url);

stmt.execute(url);

out.print("5555555555");

response.sendRedirect("../service/index.jsp");

return;

//String urll = "select * from adder";

//rs = stmt.executeQuery(urll);

//while (rs.next()) {

//flag = true;

//}

} catch (Exception e) {

e.printStackTrace();

}

//}

%>

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