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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