我的JDBC通用DAO(解说)
前两篇的连接：
1，我的JDBC通用DAO
2，我的JDBC通用DAO(续)
为了方便大家阅读和调试，现在把demo发出来
先介绍一下新增的类
首先是主角登场，业务模型类
@Table(name="model")
public class OneModel {
private Integer id;
private String name;
private Date date;
@Id
@GeneratedValue(strategy=GenerationType.IDENTITY)
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
@Column(name = "test_name")
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Date getDate() {
return date;
}
public void setDate(Date date) {
this.date = date;
}
@Override
public String toString() {
return "OneModel [id=" + id + ", name=" + name + ", date=" + date + "]";
}
} 这个类是和数据库中的表关联的，所以需要一个名叫test的库，然后建一张表
CREATE TABLE `model` ( `id` int(11) NOT NULL AUTO_INCREMENT, `name` varchar(64) DEFAULT NULL, `date` datetime DEFAULT NULL, PRIMARY KEY (`id`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8然后就可以写模型的操作接口和实现了
先是模型操作接口
public interface ModelDao extends BaseDao<OneModel, Integer>{
}
再是接口实现
@Repository("modelDao")
public class ModelDaoImpl extends BaseDaoMysqlImpl<OneModel, Integer> implements ModelDao {
public ModelDaoImpl() {
super(OneModel.class);
}
}
好了，写完了。你没看错，基本都是空的
咱写个main方法测一下
public class Main {
public static void main(String[] args) {
new Main().demo();
}
public void demo(){
ApplicationContext context=new ClassPathXmlApplicationContext("spring.xml");
ModelDao modelDao=context.getBean("modelDao",ModelDao.class);
//增
OneModel model=new OneModel();
model.setDate(new Date());
model.setName("随便写");
model=modelDao.save(model);
Integer id=model.getId();
//查一下
model=modelDao.get(id);
System.out.println(model);
//改
model.setName("再试一次");
modelDao.update(model);
//再查一下
model=modelDao.get(id);
System.out.println(model);
//删了吧
modelDao.del(id);
}
}
增删改查全都搞定，是不是很简单？
什么？你说的用的不是jdbc？我晕...给你看日志
[2013-12-08 23:39:55,507] DEBUG main (BaseDaoMysqlImpl.java:269) - sql : insert into model(test_name,date) values(?,?) values:[随便写, Sun Dec 08 23:39:55 CST 2013] [2013-12-08 23:39:55,933] INFO main (BaseDaoMysqlImpl.java:129) - sql : select * from model where id=? values:[2] OneModel [id=2, name=随便写, date=2013-12-08 23:39:55.0] [2013-12-08 23:39:55,945] DEBUG main (BaseDaoMysqlImpl.java:375) - sql : update model set test_name=?, date=? where id=? values:[再试一次, 2013-12-08 23:39:55.0, 2] [2013-12-08 23:39:55,955] INFO main (BaseDaoMysqlImpl.java:129) - sql : select * from model where id=? values:[2] OneModel [id=2, name=再试一次, date=2013-12-08 23:39:55.0] [2013-12-08 23:39:55,959] DEBUG main (BaseDaoMysqlImpl.java:415) - sql : delete from model where id=? values:[2]
2013-12-16 追加
小伙伴们要求写个多表查询的demo,就在这里了
最近几天事情比较多,天天加班,今天才有时间弄这个,很抱歉
好吧,现在切入正题
首选建测试表
CREATE TABLE `user` ( `user_id` int(11) NOT NULL AUTO_INCREMENT, `user_name` varchar(32) DEFAULT NULL, PRIMARY KEY (`user_id`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8 CREATE TABLE `user_info` ( `user_id` int(11) NOT NULL, `birthday` datetime DEFAULT NULL, `address` varchar(128) DEFAULT NULL, PRIMARY KEY (`user_id`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8然后是程序中对应的模型类
@Table(name = "user")
public class User {
private Integer userId;
private String userName;
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Column(name = "user_id")
public Integer getUserId() {
return userId;
}
public void setUserId(Integer userId) {
this.userId = userId;
}
@Column(name = "user_name")
public String getUserName() {
return userName;
}
public void setUserName(String userName) {
this.userName = userName;
}
@Override
public String toString() {
return "User [userId=" + userId + ", userName=" + userName + "]";
}
}
@Table(name = "user_info")
public class UserInfo {
private Integer userId;
private Date birthday;
private String address;
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
@Column(name = "user_id")
public Integer getUserId() {
return userId;
}
public void setUserId(Integer userId) {
this.userId = userId;
}
public Date getBirthday() {
return birthday;
}
public void setBirthday(Date birthday) {
this.birthday = birthday;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
@Override
public String toString() {
return "UserInfo [userId=" + userId + ", birthday=" + birthday
+ ", address=" + address + "]";
}
} 相关的DAO层类就不给出了,请大家参照OneModel的相关接口与实现,或者下载打包好的代码 我的JDBC通用DAO(demo)
下边是测试方法和多表查询demo
public class Main1 {
public static void main(String[] args) {
new Main1().demo();
}
public void demo(){
ApplicationContext context=new ClassPathXmlApplicationContext("spring.xml");
UserDao userDao = context.getBean("userDao",UserDao.class);
UserInfoDao userInfoDao = context.getBean("userInfoDao",UserInfoDao.class);
//首先插入测试数据
User user = new User();
user.setUserName("测试用户");
user = userDao.save(user);
UserInfo info = new UserInfo();
info.setUserId(user.getUserId());
info.setAddress("未知位置");
info.setBirthday(new Date());
info = userInfoDao.save(info);
//查一下看看
user = userDao.get(user.getUserId());
System.out.println("保存后的user=" + user);
info = userInfoDao.get(user.getUserId());
System.out.println("保存后的userInfo=" + info);
//改一下
user.setUserName("改一改");
userDao.update(user);
System.out.println("修改后的user=" + user);
//多表查询
String searchSql = "select user.user_id, user_name, address, birthday "
+ "from user, user_info where user.user_id = user_info.user_id "
+ "and user.user_id = ?";
List<Object> searchValues = new ArrayList<Object>();
searchValues.add(user.getUserId());
//可以使用Map作为多表查询结果的数据结构
List<Map<String, Object>> totalInfoMap = userDao.searchForMap(searchSql, searchValues);
System.out.println("map风格的查询结果totalInfoMap=" + totalInfoMap);
//也可以自定义一个类作为多表查询结果的数据结构
List<TotalUserInfo> totalInfo = userDao.search(searchSql, searchValues, TotalUserInfo.class);
System.out.println("对象风格的查询结果totalInfo=" + totalInfo);
//分页查询
PageBean<TotalUserInfo> page = new PageBean<TotalUserInfo>();
page.setPageNo(1);
page = userDao.search(searchSql, searchValues, page , TotalUserInfo.class);
System.out.println("分页查询结果 page=" + page);
}
}
复杂查询的结果可以用java原生的map来存储(比较便捷),也可以自定义一个盒子(类)来存储查询结果,这种方式写出的代码风格会比较友好,所以我本人喜欢这种
测试中使用的盒子(类)的声明
/**
* 这个类是一个盒子,仅仅用来装查询后的结果,在数据库中没有表和
* 它对应,所以不用指定表名与主键
*/
public class TotalUserInfo {
private Integer userId;
private String userName;
private Date birthday;
private String address;
public Integer getUserId() {
return userId;
}
public void setUserId(Integer userId) {
this.userId = userId;
}
public String getUserName() {
return userName;
}
public void setUserName(String userName) {
this.userName = userName;
}
public Date getBirthday() {
return birthday;
}
public void setBirthday(Date birthday) {
this.birthday = birthday;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
@Override
public String toString() {
return "TotalUserInfo [userId=" + userId + ", userName=" + userName
+ ", birthday=" + birthday + ", address=" + address + "]";
}
}
最后看一下上边测试生成的日志:
[2013-12-16 23:40:17,903] INFO main (BaseDaoMysqlImpl.java:277) - sql : insert into user(user_name) values(?) values:[测试用户]
[2013-12-16 23:40:18,120] INFO main (BaseDaoMysqlImpl.java:266) - sql : insert into user_info(birthday,address,user_id) values(?,?,?) values:[Mon Dec 16 23:40:18 CST 2013, 未知位置, 1]
[2013-12-16 23:40:18,135] INFO main (BaseDaoMysqlImpl.java:137) - sql : select * from user where user_id=? values:[1]
保存后的user=User [userId=1, userName=测试用户]
[2013-12-16 23:40:18,140] INFO main (BaseDaoMysqlImpl.java:137) - sql : select * from user_info where user_id=? values:[1]
保存后的userInfo=UserInfo [userId=1, birthday=2013-12-16 23:40:18.0, address=未知位置]
[2013-12-16 23:40:18,145] INFO main (BaseDaoMysqlImpl.java:383) - sql : update user set user_name=? where user_id=? values:[改一改, 1]
修改后的user=User [userId=1, userName=改一改]
[2013-12-16 23:40:18,151] INFO main (BaseDaoMysqlImpl.java:755) - sql : select user.user_id, user_name, address, birthday from user, user_info where user.user_id = user_info.user_id and user.user_id = ? values:[1]
map风格的查询结果totalInfoMap=[{user_id=1, user_name=改一改, address=未知位置, birthday=2013-12-16 23:40:18.0}]
[2013-12-16 23:40:18,154] INFO main (BaseDaoMysqlImpl.java:670) - sql : select user.user_id, user_name, address, birthday from user, user_info where user.user_id = user_info.user_id and user.user_id = ? values:[1]
对象风格的查询结果totalInfo=[TotalUserInfo [userId=1, userName=改一改, birthday=2013-12-16 23:40:18.0, address=未知位置]]
[2013-12-16 23:40:18,158] INFO main (BaseDaoMysqlImpl.java:435) - sql : select count(*) from (select user.user_id, user_name, address, birthday from user, user_info where user.user_id = user_info.user_id and user.user_id = ?) as _tn values:[1]
[2013-12-16 23:40:18,163] INFO main (BaseDaoMysqlImpl.java:670) - sql : select user.user_id, user_name, address, birthday from user, user_info where user.user_id = user_info.user_id and user.user_id = ? limit 0,10 values:[1]
分页查询结果 page=PageBean [pageNo=1, nextNo=0, priorNo=0, pageCount=1, rowCount=1, pageSize=10, startRow=0, orderBy=null, orderType=null, pageList=null, pageListSize=10, list=[TotalUserInfo [userId=1, userName=改一改, birthday=2013-12-16 23:40:18.0, address=未知位置]], groupby=null]
最后是整个demo打包
我的JDBC通用DAO(demo)
osc博文没找到文件上传，就请各位移步代码分享模块下载吧