MySQL数据库查询分页实现

package com.jdbc.page;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.util.ArrayList;
import java.util.List;

/**
* 注：FinalParm.PAGER_ECORD 為每頁顯示數據量這裡為3
* @author Administrator
*
*/

public class JDBCPageTest {

private Connection conn = null;

private PreparedStatement pre = null;

private ResultSet rs = null;

public JDBCPageTest() {
this.setConection();
}

/**
* 获得连接对象
*/
public void setConection() {
try {
Class.forName("org.gjt.mm.mysql.Driver");
conn = DriverManager.getConnection(
"jdbc:mysql://localhost:3306/test", "root", "");
} catch (Exception e) {
e.printStackTrace();
}
}

/**
* 获得总页数
* 注：主要用於頁面跳轉傳參和總頁數顯示
* @return
*/
public int getTotalPage() throws Exception {
int totalPage = 0;  //总页数
int totalRecord = 0; //总记录数
String sql = "select count(*) as totalRecord from t_user";
pre = conn.prepareStatement(sql);
rs = pre.executeQuery();
while (rs.next()) {
totalRecord = rs.getInt("totalRecord");
}
System.out.println("总记录数:" + totalRecord);

//根据总记录数算出总页数
if (totalRecord % FinalParm.PAGER_ECORD == 0) {
totalPage = totalRecord / FinalParm.PAGER_ECORD;
} else {
totalPage = totalRecord / FinalParm.PAGER_ECORD + 1;
}
return totalPage;
}

/**
* 获得每页数据 注：根据不同的数据库其SQL分页语句也有不同 这里采用MySQL数据库
* 这里将查出数据放到一个LIST，具体返回根据自己业务而定
* @param currentPage
* @return
*/
public List getReslutList(int currentPage) throws Exception {
List list = new ArrayList();
String sql = "select * from t_user limit " + (currentPage - 1)
* FinalParm.PAGER_ECORD + "," + FinalParm.PAGER_ECORD + "";
pre = conn.prepareStatement(sql);
rs = pre.executeQuery();
while (rs.next()) {
list.add(rs.getInt("id"));
list.add(rs.getString("name"));
list.add(rs.getString("password"));
}
return list;
}

/**
* 关闭所有对象
*
* @throws Exception
*/
public void closeAll() throws Exception {
if (rs != null) {
rs.close();
} else if (pre != null) {
pre.close();
} else if (conn != null) {
conn.close();
}
}

/**
* @测试 列出第二页的数据
*/
public static void main(String[] args) throws Exception {

JDBCPageTest test = new JDBCPageTest();
System.out.println("总页数：" + test.getTotalPage());
List list = test.getReslutList(2);
for (int i = 0; i < list.size(); i++) {
System.out.print(list.get(i) + " ");
}
}

}