哇塞，一個空格的問題花了一整天的時間終于找出了錯~~~

1.首先實現查詢表中的所有數據：

查看數據庫表中信息

String dbUrl= "jdbc:mysql://localhost:3306/book";

String dbUser= "root";

String dbPwd= "123456";

Class.forName(dbDriver);

Connection conn=DriverManager.getConnection(dbUrl,dbUser,dbPwd);

String sql= "select * from admin order by id";

Statement stmt= conn.createStatement();//創建Statement對象stmt

ResultSet rs = stmt.executeQuery(sql);//調用executeQuery方法進行數據庫查詢，結果放在rs中

%>

//判斷結果集是否為空，如果不為空，進行循環畫表

">刪除">編輯

增加用戶

2.實現刪除功能：

1

2

3 pageEncoding="UTF-8"%>

4

5

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7

8

刪除

9

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11

12 String idStr = request.getParameter( "id" );//通過request內置對象獲得頁面傳遞主鍵

13 int id=Integer.parseInt(idStr == null || "".equals(idStr)?"0":idStr);14 String dbDriver = "com.mysql.jdbc.Driver";15 String dbUrl = "jdbc:mysql://localhost:3306/book";16 String dbUser = "root";17 String dbPwd = "123456";18 Class.forName(dbDriver);19 Connection conn =DriverManager.getConnection(dbUrl,dbUser,dbPwd);20 String sql = "delete from admin where id=" + id;//定義執行的刪除sql語句

21 Statement stmt =conn.createStatement();22 int res =stmt.executeUpdate(sql);23 if (res < 0)24 out.print("刪除失敗");25 else

26 response.sendRedirect("do_query.jsp");27 %>

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29

3.實現編輯功能：

1

2

3 pageEncoding="UTF-8"%>

4

5

6

7

8

編輯

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11

12 String idStr = request.getParameter( "id");13 int id=Integer.parseInt(idStr == null || "".equals(idStr)?"0":idStr);14 String dbDriver = "com.mysql.jdbc.Driver";15 String dbUrl = "jdbc:mysql://localhost:3306/book";16 String dbUser = "root";17 String dbPwd = "123456";18 Class.forName(dbDriver);19 Connection conn =DriverManager.getConnection(dbUrl,dbUser,dbPwd);20 String sql = "select * from admin where id=" +id;21 Statement stmt =conn.createStatement();22 ResultSet rs =stmt.executeQuery(sql);23 if(rs.next()){24 %>

25

" method="post">

26 >

27 >

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31 }32 %>

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4.實現更新功能:

更新

String idStr= request.getParameter( "id");int id=Integer.parseInt(idStr == null || "".equals(idStr)?"0":idStr);

String username= new String(request.getParameter("username"));

String password= new String(request.getParameter("password"));

String dbDriver= "com.mysql.jdbc.Driver";

String dbUrl= "jdbc:mysql://localhost:3306/book";

String dbUser= "root";

String dbPwd= "123456";

Class.forName(dbDriver);

Connection conn=DriverManager.getConnection(dbUrl,dbUser,dbPwd);

String sql= "update admin set username='"+username+"',password='"+password+"'where id =" +id;//定義執行更新的sql語句

Statement stmt = conn.createStatement();//創建Statement對象stmt

int res = stmt.executeUpdate(sql);//調用executeUpdate方法執行更新操作，結果值存儲到res

if(res>0)

response.sendRedirect("do_query.jsp");elseout.print("更新失敗");%>

5.向數據庫添加記錄：

添加新用戶

6.實現添加功能：

添加用戶

String password= request.getParameter("password");

String dbDriver= "com.mysql.jdbc.Driver";

String dbUrl= "jdbc:mysql://localhost:3306/book";

String dbUser= "root";

String dbPwd= "123456";

Class.forName(dbDriver);

Connection conn=DriverManager.getConnection(dbUrl,dbUser,dbPwd);

String sql= "insert into admin(username,password)values('"+ username +"','"+ password +"')";

Statement stmt=conn.createStatement();int res =stmt.executeUpdate(sql);if(res>0)

response.sendRedirect("do_query.jsp");elseout.print("添加失敗");%>

編程的路總是孤獨的，加油！痛并快樂著~~~~~

總結

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