12.4 listPagedPerson.jsp
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%@ page import="java.sql.*" %>
<%@ page import="java.sql.Date" %>
<%@ page import="com.helloben.util.*" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>My JSP ‘listPagedPerson.jsp‘ starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
<style type="text/css">
body, td, th, input {
font-size:12px;
text-align:center;
}
</style>
</head>
<body>
<%
final int pageSize = 10;
int pageNum = 1;
int pageCount = 1;
int recordCount = 0;
try {
pageNum = Integer.parseInt(request.getParameter("pageNum"));
}
catch (Exception e){
}
Connection conn = null;
PreparedStatement preStmt = null;
ResultSet rs = null;
String sql = null;
try {
sql = "select count(*) from tb_person ";
recordCount = DbManager.getCount(sql);
pageCount = (recordCount + pageSize - 1) / pageSize;
int startRecord = (pageNum - 1) * pageSize;
sql = "select * from tb_person limit ?, ?";
conn = DbManager.getConnection();
preStmt = conn.prepareStatement(sql);
DbManager.setParams(preStmt, startRecord, pageSize);
rs = preStmt.executeQuery();
%>
<form action="operatePerson.jsp" method="get">
<table bgcolor="#CCCCCC" cellspacing=1 cellpadding=5 width=100%>
<tr bgcolor=#DDDDDD>
<th></th>
<th>ID</th>
<th>Name</th>
<th>English Name</th>
<th>Gender</th>
<th>Age</th>
<th>Birthday</th>
<th>Comment</th>
<th>Created Time</th>
<th>Operation</th>
</tr>
<%
while (rs.next()){
int id = rs.getInt("id");
int age = rs.getInt("age");
String name = rs.getString("name");
String englishName = rs.getString("english_name");
String sex = rs.getString("sex");
String description = rs.getString("description");
Date birthday = rs.getDate("birthday");
Timestamp createTime = rs.getTimestamp("create_time");
%>
<tr bgcolor=#FFFFFF>
<td><input type="checkbox" name="id" value="<%= id %>"/></td>
<td><%= id %></td>
<td><%= name %></td>
<td><%= englishName %></td>
<td><%= sex %></td>
<td><%= age %></td>
<td><%= birthday %></td>
<td><%= description %></td>
<td><%= createTime %></td>
<td>
<a href=‘operatePerson.jsp?action=del&id=" + <%= id %> + "‘ onclick=‘delete_Click()‘>Delete</a>
<a href=‘operatePerson.jsp?action=edit&id=" + <%= id %> + "‘>Edit</a>
</td>
</tr>
<%
}
%>
</table>
<table align=right>
<tr>
<td><%=Pagination.getPagination(pageNum, pageCount,
recordCount, request.getRequestURI())%>
</td>
</tr>
</table>
<br />
<br />
<br />
<table align=left>
<tr>
<td>SQL: <%=sql%></td>
</tr>
</table>
</form>
<%
}
catch (SQLException e){
out.println("Exception occurs when execute the SQL of " + sql + ", the message is: " + e.getMessage());
e.printStackTrace();
}
finally {
if (rs != null)
rs.close();
if (preStmt != null)
preStmt.close();
if (conn != null)
conn.close();
}
%>
</body>
</html>
12.5 DbManager.java
package com.helloben.util;
import java.sql.Connection;
import java.sql.Date;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.sql.Timestamp;
import java.sql.Types;
import com.mysql.jdbc.Driver;
public class DbManager {
public static Connection getConnection() throws SQLException {
return getConnection("databaseWeb", "root", "mysql");
}
public static Connection getConnection(String dbName, String userName, String password) throws SQLException {
String url = "jdbc:mysql://localhost:3306/" + dbName + "?characterEncoding=utf-8";
DriverManager.registerDriver(new Driver());
return DriverManager.getConnection(url, userName, password);
}
public static void setParams(PreparedStatement preStmt, Object... params) throws SQLException {
if (params == null || params.length == 0)
return;
for (int i = 1; i <= params.length; i++) {
Object param = params[i - 1];
if (param == null) {
preStmt.setNull(i, Types.NULL);
}
else if (param instanceof Integer) {
preStmt.setInt(i, (Integer) param);
}
else if (param instanceof String) {
preStmt.setString(i, (String) param);
}
else if (param instanceof Double) {
preStmt.setDouble(i, (Double) param);
}
else if (param instanceof Long) {
preStmt.setDouble(i, (Long) param);
}
else if (param instanceof Timestamp) {
preStmt.setTimestamp(i, (Timestamp) param);
}
else if (param instanceof Boolean) {
preStmt.setBoolean(i, (Boolean) param);
}
else if (param instanceof Date) {
preStmt.setDate(i, (Date) param);
}
}
}
public static int executeUpdate(String sql) throws SQLException {
return executeUpdate(sql, new Object[] {});
}
public static int executeUpdate(String sql, Object... params) throws SQLException {
Connection conn = null;
PreparedStatement preStmt = null;
try {
conn = getConnection();
preStmt = conn.prepareStatement(sql);
setParams(preStmt, params);
return preStmt.executeUpdate();
}
finally {
if (preStmt != null)
preStmt.close();
if (conn != null)
conn.close();
}
}
public static int getCount(String sql) throws SQLException {
Connection conn = null;
Statement stmt = null;
ResultSet rs = null;
try {
conn = getConnection();
stmt = conn.createStatement();
rs = stmt.executeQuery(sql);
rs.next();
return rs.getInt(1);
}
finally {
if (rs != null)
rs.close();
if (stmt != null)
stmt.close();
if (conn != null)
conn.close();
}
}
}
12.6 Pagination.java
package com.helloben.util;
public class Pagination {
public static String getPagination(int pageNum, int pageCount,
int recordCount, String pageUrl) {
String url = pageUrl.contains("?") ? pageUrl : pageUrl + "?";
if(!url.endsWith("?") && !url.endsWith("&")){
url += "&";
}
StringBuffer buffer = new StringBuffer();
buffer.append("第 " + pageNum + "/" + pageCount + " 页 共 " + recordCount + " 记录 ");
buffer.append(pageNum == 1 ? " 第一页 " : " <a href=‘" + url + "pageNum=1‘>第一页</a> ");
buffer.append(pageNum == 1 ? " 上一页 " : " <a href=‘" + url + "pageNum=" + (pageNum - 1) + "‘>上一页</a> ");
buffer.append(pageNum == pageCount ? " 下一页 " : " <a href=‘" + url + "pageNum=" + (pageNum + 1) + "‘>下一页</a> ");
buffer.append(pageNum == pageCount ? " 最后一页 " : " <a href=‘" + url + "pageNum=" + pageCount + "‘>最后一页</a> ");
buffer.append(" 到 <input type=‘text‘ ");
buffer.append(" name=‘helloben_goto_input‘ ");
buffer.append(" style=‘width:25px; text-align:center; ‘> 页 ");
buffer.append(" <input type=‘button‘");
buffer.append(" name=‘helloben_goto_button‘ value=‘Go‘>");
buffer.append("<script language=‘javascript‘>");
buffer.append("function helloben_enter(){");
buffer.append(" if(event.keyCode == 13){");
buffer.append(" helloben_goto();");
buffer.append(" return false;");
buffer.append(" }");
buffer.append(" return true;");
buffer.append("} ");
buffer.append("function helloben_goto(){");
buffer.append(" var numText = document.getElementsByName(‘helloben_goto_input‘)[0].value;");
buffer.append(" var num = parseInt(numText, 10);");
buffer.append(" if(!num){");
buffer.append(" alert(‘页数必须为数字‘); ");
buffer.append(" return;");
buffer.append(" }");
buffer.append(" if(num<1 || num>" + pageCount + "){");
buffer.append(" alert(‘页数必须大于 1，且小于总页数 " + pageCount + " ‘); ");
buffer.append(" return;");
buffer.append(" }");
buffer.append(" location=‘" + url + "pageNum=‘ + num;");
buffer.append("}");
buffer.append("document.getElementsByName(‘helloben_goto_input‘)[0].onkeypress = helloben_enter;");
buffer.append("document.getElementsByName(‘helloben_goto_button‘)[0].onclick = helloben_goto;");
buffer.append("</script>");
return buffer.toString();
}
}
JDBC详解(2)
时间： 2024-10-11 17:21:08