实例介绍
【实例简介】
【实例截图】
【核心代码】
package com.service; import java.sql.Connection; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.sql.Statement; import java.util.ArrayList; import java.util.List; import java.util.UUID; import com.dao.CarInfo; import com.dao.DateInfo; import com.db.util; public class HandleImpl implements IHandle { public boolean add(CarInfo carInfo) { boolean flag = false; Connection conn = null; PreparedStatement pst = null; String sql = "insert into car_info(id,car_number)values(?,?)"; try { conn = util.getConnection(); pst = (PreparedStatement) conn.prepareStatement(sql); UUID uuid=UUID.randomUUID(); String id = uuid.toString(); pst.setString(1, id); pst.setString(2, carInfo.getCarNumber()); int rows = pst.executeUpdate(); if (rows > 0) { flag = true; } } catch (Exception e) { e.printStackTrace(); } finally { util.close(pst, conn); } return flag; } public List<CarInfo> getCarInfos() { List<CarInfo> list = new ArrayList<CarInfo>(); Connection conn = null; ResultSet rs = null; //!!!!!!! Statement stmt = null; try{ conn = util.getConnection(); String sql = "select id,car_number from car_info"; stmt = conn.createStatement(); rs = stmt.executeQuery(sql); while( rs.next()){ CarInfo ci = new CarInfo(); ci.setId(rs.getString("id")); ci.setCarNumber(rs.getString("car_number")); list.add(ci); } }catch (Exception e) { e.printStackTrace(); }finally{ util.close(rs, stmt, conn); } return list; } public List<DateInfo> getDateInfos() { List<DateInfo> list = new ArrayList<DateInfo>(); Connection conn = null; ResultSet rs = null; //!!!!!!! Statement stmt = null; try{ conn = util.getConnection(); String sql = "select d.id,d.date_time,d.park_time from car_info cn LEFT JOIN date_info d ON cn.id = d.car_id where car_number='陕A111'"; stmt = conn.createStatement(); rs = stmt.executeQuery(sql); while( rs.next()){ DateInfo di = new DateInfo(); di.setId(rs.getString("id")); di.setDateTime(rs.getString("date_time")); di.setParkTime(rs.getString("park_time")); list.add(di); } }catch (Exception e) { e.printStackTrace(); }finally{ util.close(rs, stmt, conn); } return list; } public List<DateInfo> getDateInfosB() { List<DateInfo> list = new ArrayList<DateInfo>(); Connection conn = null; ResultSet rs = null; //!!!!!!! Statement stmt = null; try{ conn = util.getConnection(); String sql = "select d.id,d.date_time,d.park_time from car_info cn LEFT JOIN date_info d ON cn.id = d.car_id where car_number='陕B222'"; stmt = conn.createStatement(); rs = stmt.executeQuery(sql); while( rs.next()){ DateInfo di = new DateInfo(); di.setId(rs.getString("id")); di.setDateTime(rs.getString("date_time")); di.setParkTime(rs.getString("park_time")); list.add(di); } }catch (Exception e) { e.printStackTrace(); }finally{ util.close(rs, stmt, conn); } return list; } public List<DateInfo> getDateInfosC() { List<DateInfo> list = new ArrayList<DateInfo>(); Connection conn = null; ResultSet rs = null; //!!!!!!! Statement stmt = null; try{ conn = util.getConnection(); String sql = "select d.id,d.date_time,d.park_time from car_info cn LEFT JOIN date_info d ON cn.id = d.car_id where car_number='陕C333'"; stmt = conn.createStatement(); rs = stmt.executeQuery(sql); while( rs.next()){ DateInfo di = new DateInfo(); di.setId(rs.getString("id")); di.setDateTime(rs.getString("date_time")); di.setParkTime(rs.getString("park_time")); list.add(di); } }catch (Exception e) { e.printStackTrace(); }finally{ util.close(rs, stmt, conn); } return list; } // @Override public boolean del(String id) { boolean flag = false; Connection conn = null; PreparedStatement pst = null; String sql = "delete from car_info where id =" "'" id "'"; try { conn = util.getConnection(); pst = (PreparedStatement) conn.prepareStatement(sql); int rows = pst.executeUpdate(); if (rows > 0) { flag = true; } } catch (Exception e) { e.printStackTrace(); } finally { util.close(pst, conn); } return flag; } public CarInfo getCarInfoById(String id) { Connection conn = null; ResultSet rs = null; Statement stmt = null; CarInfo ci = new CarInfo(); try { conn = util.getConnection(); String sql = "select * from car_info where id =" "'" id "'"; stmt = conn.createStatement(); rs = stmt.executeQuery(sql); while (rs.next()) { if (rs.getString("id").equals(id)) { ci.setId(id); ci.setCarNumber(rs.getString("car_number")); } } } catch (Exception e){ e.printStackTrace(); } finally{ util.close(rs, stmt, conn); } return ci; } public boolean update(CarInfo ci) { boolean flag = false; Connection conn = null; java.sql.PreparedStatement pst = null; conn = util.getConnection(); String sql = "update car_info set car_number=? where id =" "'" ci.getId() "'"; try { pst = conn.prepareStatement(sql); pst.setString(1, ci.getCarNumber()); int rows = pst.executeUpdate(); if (rows > 0){ flag = true; } } catch (Exception e){ e.printStackTrace(); } finally { util.close(pst, conn); } return flag; } }
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