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) + " "); } } }