Mybatis
目录
一、配置依赖文件
二、配置log4j.properties文件
三、配置SqlMapConfig.xml文件
四、配置Mapper.xml文件
五、增删改查
六、动态代理
七、输入映射
八、输出映射
九、动态SQL
十、多对一
十一、一对多
十二、多对多
十三、自查讯
一、配置依赖文件
4.0.0
com.iotek
fristMybatis
1.0-SNAPSHOT
jar
org.mybatis
mybatis
3.5.7
junit
junit
4.12
test
mysql
mysql-connector-java
8.0.30
log4j
log4j
1.2.17
8
8
二、配置log4j.properties文件
# Global logging configuration
log4j.rootLogger=DEBUG, stdout
# Console output...
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%5p [%t] - %m%n三、配置SqlMapConfig.xml文件
四、配置Mapper.xml文件
package com.iotek.pojo;
/**
* @Author:
* @CreateTime: 2023-02-05 13:25
*/
public class Goods {
private int goods_id;
private String goods_name;
private double goods_price;
public Goods() {
super();
}
public Goods(int goods_id, String goods_name, double goods_price) {
this.goods_id = goods_id;
this.goods_name = goods_name;
this.goods_price = goods_price;
}
public int getGoods_id() {
return goods_id;
}
public void setGoods_id(int goods_id) {
this.goods_id = goods_id;
}
public String getGoods_name() {
return goods_name;
}
public void setGoods_name(String goods_name) {
this.goods_name = goods_name;
}
public double getGoods_price() {
return goods_price;
}
public void setGoods_price(double goods_price) {
this.goods_price = goods_price;
}
@Override
public String toString() {
return "Goods{" +
"goods_id=" + goods_id +
", goods_name='" + goods_name + '\'' +
", goods_price=" + goods_price +
'}';
}
}
package com.iotek.mybatis.test;
import com.iotek.pojo.Goods;
import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import org.junit.Test;
import java.io.IOException;
import java.io.InputStream;
/**
* @Author:
* @CreateTime: 2023-02-05 13:38
*/
public class MybatisTest {
/**
* @description:查询一条数据
* @param
* @return void
* @time: 2023/2/5 13:53
**/
@Test
public void test1() throws IOException {
//加载核心配置文件
InputStream inputStream = Resources.getResourceAsStream("SqlMapConfig.xml");
SqlSessionFactoryBuilder sqlSessionFactoryBuilder = new SqlSessionFactoryBuilder();
SqlSessionFactory sqlSessionFactory = sqlSessionFactoryBuilder.build(inputStream);
//所有的增删改查都在session中
SqlSession session = sqlSessionFactory.openSession();
//查询一条数据 com.iotek.selectGoodsByGoodsID命名空间
Goods goods= session.selectOne("com.iotek.selectGoodsByGoodsID");
System.out.println(goods);
}
}
五、增删改查
INSERT INTO t_goods(goods_name,goods_price) VALUES(#{goods_name},#{goods_price})
DELETE FROM t_goods WHERE goods_id=#{id}
UPDATE t_goods SET goods_name=#{goods_name},goods_price=#{goods_price} WHERE goods_id=#{goods_id}
package com.iotek.mybatis.test;
import com.iotek.pojo.Goods;
import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import org.junit.Test;
import java.io.IOException;
import java.io.InputStream;
import java.util.List;
/**
* @Author:
* @CreateTime: 2023-02-05 13:38
*/
public class MybatisTest {
/**
* @description:查询一条数据
* @param
* @return void
* @time: 2023/2/5 13:53
**/
@Test
public void test1() throws IOException {
//加载核心配置文件
InputStream inputStream = Resources.getResourceAsStream("SqlMapConfig.xml");
SqlSessionFactoryBuilder sqlSessionFactoryBuilder = new SqlSessionFactoryBuilder();
SqlSessionFactory sqlSessionFactory = sqlSessionFactoryBuilder.build(inputStream);
//所有的增删改查都在session中
SqlSession session = sqlSessionFactory.openSession();
//查询一条数据 com.iotek.selectGoodsByGoodsID命名空间
Goods goods= session.selectOne("com.iotek.selectGoodsByGoodsID",10);
System.out.println(goods);
}
/**
* @description:插入一条数据
* @param
* @return void
* @time: 2023/2/5 15:09
**/
@Test
public void test2() throws IOException {
//加载核心配置文件
InputStream inputStream = Resources.getResourceAsStream("SqlMapConfig.xml");
SqlSessionFactoryBuilder sqlSessionFactoryBuilder = new SqlSessionFactoryBuilder();
SqlSessionFactory sqlSessionFactory = sqlSessionFactoryBuilder.build(inputStream);
//所有的增删改查都在session中
SqlSession session = sqlSessionFactory.openSession();
//查询一条数据 com.iotek.selectGoodsByGoodsID命名空间
Goods goods = new Goods(0,"宏碁/ACER",29577.28);
//返回值影响行数
int insert = session.insert("com.iotek.insertOneGoods", goods);
//事务提交 内从中提交到磁盘
session.commit();
System.out.println("插入了"+insert+"条数据");
}
/**
* @description:删除了一条数据
* @param
* @return void
* @time: 2023/2/5 20:16
**/
@Test
public void test3() throws IOException {
//加载核心配置文件
InputStream inputStream = Resources.getResourceAsStream("SqlMapConfig.xml");
SqlSessionFactoryBuilder sqlSessionFactoryBuilder = new SqlSessionFactoryBuilder();
SqlSessionFactory sqlSessionFactory = sqlSessionFactoryBuilder.build(inputStream);
//所有的增删改查都在session中
SqlSession session = sqlSessionFactory.openSession();
//返回值影响行数
int delete = session.delete("com.iotek.deleteOneGoods", 21);
//事务提交 内从中提交到磁盘
session.commit();
System.out.println("删除了"+delete+"条数据");
}
/**
* @description:修改了一条数据
* @param
* @return void
* @time: 2023/2/5 20:32
**/
@Test
public void test4() throws IOException {
//加载核心配置文件
InputStream inputStream = Resources.getResourceAsStream("SqlMapConfig.xml");
SqlSessionFactoryBuilder sqlSessionFactoryBuilder = new SqlSessionFactoryBuilder();
SqlSessionFactory sqlSessionFactory = sqlSessionFactoryBuilder.build(inputStream);
//所有的增删改查都在session中
SqlSession session = sqlSessionFactory.openSession();
//返回值影响行数
Goods goods = new Goods(22,"微星/MSI",39577.28);
int delete = session.update("com.iotek.updateOneGoods", goods);
//事务提交 内从中提交到磁盘
session.commit();
System.out.println("修改了"+delete+"条数据");
}
/**
* @description:查询集合
* @param
* @return void
* @time: 2023/2/5 20:44
**/
@Test
public void test5() throws IOException {
//加载核心配置文件
InputStream inputStream = Resources.getResourceAsStream("SqlMapConfig.xml");
SqlSessionFactoryBuilder sqlSessionFactoryBuilder = new SqlSessionFactoryBuilder();
SqlSessionFactory sqlSessionFactory = sqlSessionFactoryBuilder.build(inputStream);
//所有的增删改查都在session中
SqlSession session = sqlSessionFactory.openSession();
//返回集合
List goodsLis = session.selectList("com.iotek.selectGoodsLikeGoodsName","华");
//事务提交 内从中提交到磁盘
System.out.println(goodsLis);
}
}
六、动态代理
INSERT INTO t_user(userName,userAge) VALUES(#{userName},#{userAge})
package com.iotek.mybatis.DaoTest;
import com.iotek.Dao.UserMapper;
import com.iotek.pojo.User;
import com.iotek.pojo.UserAgeCondition;
import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import org.junit.Before;
import org.junit.Test;
import java.io.IOException;
import java.io.InputStream;
import java.util.List;
/**
* @Author:
* @CreateTime: 2023-02-05 23:06
*/
public class UserDaoTest {
private SqlSessionFactory sqlSessionFactory;
//Before在运行Test之前执行
@Before
public void getSessionFactory() throws IOException {
InputStream inputStream = Resources.getResourceAsStream("SqlMapConfig.xml");
SqlSessionFactoryBuilder sqlSessionFactoryBuilder = new SqlSessionFactoryBuilder();
sqlSessionFactory = sqlSessionFactoryBuilder.build(inputStream);
}
/**
* @description:添加一条数据
* @param
* @return void
* @time: 2023/2/6 12:00
**/
@Test
public void addUser(){
SqlSession session = sqlSessionFactory.openSession();
UserMapper userMapper = session.getMapper(UserMapper.class);//代理对象
User user = new User(0,"lucy",18);
userMapper.addUser(user);
session.commit();
}
/**
* @description:姓名模糊查询
* @param
* @return void
* @time: 2023/2/6 14:38
**/
@Test
public void queryUserByUserName(){
SqlSession session = sqlSessionFactory.openSession();
UserMapper userMapper = session.getMapper(UserMapper.class);//代理对象
List user = userMapper.queryUserByUserName("思");
System.out.println(user);
}
/**
* @description:查询年龄20到50岁之间的
* @param
* @return void
* @time: 2023/2/6 14:15
**/
@Test
public void queryUserByUserAgeCondition(){
SqlSession session = sqlSessionFactory.openSession();
UserMapper userMapper = session.getMapper(UserMapper.class);//代理对象
UserAgeCondition uc = new UserAgeCondition();
uc.setMaxAge(50);
uc.setMinAge(20);
User user = new User();
user.setUserAgeCondition(uc);
List users = userMapper.queryUserByUserAgeCondition(user);
System.out.println(users);
}
}
七、输入映射
package com.iotek.Dao;
import com.iotek.pojo.Goods;
import org.apache.ibatis.annotations.Param;
import java.util.List;
import java.util.Map;
/**
* @Author:
* @CreateTime: 2023-02-06 12:41
*/
public interface GoodsMapper {
//添加一条数据
public void addGoods(Goods goods);
//删除一条数据
public void deleteGoodsByGoodsId(int goodsID);
//修改一条数据
public void updateGoodsByGoodsId(Goods goods);
//根据ID查询
public Goods queryGoodsByGoodsID(int goodsId);
//根据名称查询
public List queryGoodsByGoodsName(String goodsName);
//根据ID和名称查询 传入多个参数默认放入Map键值对中 map key value --> key=param1 value=goodsID;key=param2 value=goodsName 参数按顺序
public Goods queryGoodsByGoodsIDAndGoodsName(int goodsID,String goodsName);
//根据ID和名称查询 @Param注解方式
public Goods queryGoodsByGoodsIDAndGoodsName2(@Param("goodsID") int goodsID, @Param("goodsName") String goodsName);
//根据ID和名称查询 一个用param一个用@Param注解方式
public Goods queryGoodsByGoodsIDAndGoodsName3(@Param("goodsID") int goodsID, String goodsName);
//根据ID和名称查询 传入Map
public Goods queryGoodsByMap(Map map);
//根据ID和名称查询 传入List集合
public Goods queryGoodsByIDAndList(int goodsID,List goods);
}
INSERT INTO t_goods(goods_name,goods_price) VALUES (#{goods_name},#{goods_price});
DELETE FROM t_goods WHERE goods_id = #{goods_id}
UPDATE t_goods SET goods_name=#{goods_name},goods_price=#{goods_price} WHERE goods_id = #{goods_id}
package com.iotek.mybatis.DaoTest;
import com.iotek.Dao.GoodsMapper;
import com.iotek.pojo.Goods;
import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import org.junit.Before;
import org.junit.Test;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
/**
* @Author:
* @CreateTime: 2023-02-06 12:49
*/
public class GoodsDaoTest {
private SqlSessionFactory sqlSessionFactory;
@Before
public void getSqlSessionFactory() throws IOException {
InputStream inputStream = Resources.getResourceAsStream("SqlMapConfig.xml");
SqlSessionFactoryBuilder sqlSessionFactoryBuilder = new SqlSessionFactoryBuilder();
sqlSessionFactory = sqlSessionFactoryBuilder.build(inputStream);
}
/**
* @description:添加一条记录
* @param
* @return void
* @time: 2023/2/6 16:06
**/
@Test
public void addGoods(){
SqlSession session = sqlSessionFactory.openSession();
GoodsMapper goodsMapper = session.getMapper(GoodsMapper.class);
Goods goods = new Goods(0,"戴尔/DELL",45633.2);
goodsMapper.addGoods(goods);
session.commit();
}
/**
* @description:根据ID删除
* @param
* @return void
* @time: 2023/2/6 16:06
**/
@Test
public void deleteGoodsByGoodsId(){
SqlSession session = sqlSessionFactory.openSession();
GoodsMapper goodsMapper = session.getMapper(GoodsMapper.class);
goodsMapper.deleteGoodsByGoodsId(22);
session.commit();
}
/**
* @description:根据ID修改
* @param
* @return void
* @time: 2023/2/6 16:07
**/
@Test
public void updateGoodsByGoodsId(){
SqlSession session = sqlSessionFactory.openSession();
GoodsMapper goodsMapper = session.getMapper(GoodsMapper.class);
Goods goods = new Goods(24,"华为/HUAWEI",85416.37);
goodsMapper.updateGoodsByGoodsId(goods);
session.commit();
}
/**
* @description:根据ID查询
* @param
* @return void
* @time: 2023/2/6 16:07
**/
@Test
public void queryGoodsByGoodsID(){
SqlSession session = sqlSessionFactory.openSession();
GoodsMapper goodsMapper = session.getMapper(GoodsMapper.class);
Goods goods = goodsMapper.queryGoodsByGoodsID(10);
System.out.println(goods);
}
/**
* @description:根据名称查询
* @param
* @return void
* @time: 2023/2/6 16:07
**/
@Test
public void queryGoodsByGoodsName(){
SqlSession session = sqlSessionFactory.openSession();
GoodsMapper goodsMapper = session.getMapper(GoodsMapper.class);
List goodsList = goodsMapper.queryGoodsByGoodsName("华");
System.out.println(goodsList);
}
/**
* @description:根据ID和名称查询
* @param
* @return void
* @time: 2023/2/6 16:08
**/
@Test
public void queryGoodsByGoodsIDAndGoodsName(){
SqlSession session = sqlSessionFactory.openSession();
GoodsMapper goodsMapper = session.getMapper(GoodsMapper.class);
Goods goods = goodsMapper.queryGoodsByGoodsIDAndGoodsName(10,"微星/MSI");
System.out.println(goods);
}
@Test
public void queryGoodsByGoodsIDAndGoodsName2(){
SqlSession session = sqlSessionFactory.openSession();
GoodsMapper goodsMapper = session.getMapper(GoodsMapper.class);
Goods goods = goodsMapper.queryGoodsByGoodsIDAndGoodsName2(10,"微星/MSI");
System.out.println(goods);
}
@Test
public void queryGoodsByGoodsIDAndGoodsName3(){
SqlSession session = sqlSessionFactory.openSession();
GoodsMapper goodsMapper = session.getMapper(GoodsMapper.class);
Goods goods = goodsMapper.queryGoodsByGoodsIDAndGoodsName3(10,"微星/MSI");
System.out.println(goods);
}
@Test
public void queryGoodsByMap(){
SqlSession session = sqlSessionFactory.openSession();
GoodsMapper goodsMapper = session.getMapper(GoodsMapper.class);
Map map = new HashMap<>();
map.put("goodsID",10);
map.put("goodsName","微星/MSI");
Goods goods = goodsMapper.queryGoodsByMap(map);
System.out.println(goods);
}
@Test
public void queryGoodsByIDAndList(){
SqlSession session = sqlSessionFactory.openSession();
GoodsMapper goodsMapper = session.getMapper(GoodsMapper.class);
Goods goods = new Goods();
goods.setGoods_name("微星/MSI");
List goodsList = new ArrayList<>();
goodsList.add(goods);
Goods gd = goodsMapper.queryGoodsByIDAndList(10,goodsList);
System.out.println(gd);
}
}
八、输出映射
九、动态SQL
SELECT * FROM t_goods
package com.iotek.DaoTest;
import com.iotek.Dao.AnimalDao;
import com.iotek.Dao.GoodsDao;
import com.iotek.pojo.Animal;
import com.iotek.pojo.Goods;
import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import org.junit.Before;
import org.junit.Test;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;
/**
* @Author:
* @CreateTime: 2023-02-13 14:01
*/
public class DynSqlTest {
private SqlSessionFactory sqlSessionFactory;
@Before
public void getsessionFactory() throws IOException {
InputStream inputStream = Resources.getResourceAsStream("SqlMapConfig.xml");
SqlSessionFactoryBuilder sqlSessionFactoryBuilder = new SqlSessionFactoryBuilder();
sqlSessionFactory = sqlSessionFactoryBuilder.build(inputStream);
}
@Test
public void queryGoodsByIf(){
SqlSession session = sqlSessionFactory.openSession();
GoodsDao goodsDao = session.getMapper(GoodsDao.class);
Goods goods = new Goods();
goods.setGoods_name("华为");//SELECT * FROM t_goods WHERE goods_name LIKE "%华为%"
//goods.setGoods_name("");//SELECT * FROM t_goods
goods.setGoods_price(80000);//SELECT * FROM t_goods WHERE goods_name LIKE "%华为%" AND goods_price>?
List list = goodsDao.queryGoodsByIf(goods);
System.out.println(list);
}
@Test
public void queryGoodsByWhere(){
SqlSession session = sqlSessionFactory.openSession();
GoodsDao goodsDao = session.getMapper(GoodsDao.class);
Goods goods = new Goods();
goods.setGoods_name("华为");//SELECT * FROM t_goods WHERE goods_name LIKE "%华为%"
//goods.setGoods_name("");//SELECT * FROM t_goods
goods.setGoods_price(80000);//SELECT * FROM t_goods WHERE goods_name LIKE "%华为%" AND goods_price>?
List list = goodsDao.queryGoodsByWhere(goods);
System.out.println(list);
}
@Test
public void queryGoodsByChoose(){
SqlSession session = sqlSessionFactory.openSession();
GoodsDao goodsDao = session.getMapper(GoodsDao.class);
Goods goods = new Goods();
goods.setGoods_name("华为");//SELECT * FROM t_goods WHERE goods_name LIKE "%华为%"
//goods.setGoods_name("");//SELECT * FROM t_goods
goods.setGoods_price(80000);//SELECT * FROM t_goods WHERE goods_name LIKE "%华为%" AND goods_price>?
List list = goodsDao.queryGoodsByChoose(goods);
System.out.println(list);
}
@Test
public void queryGoodsByForeach1(){
SqlSession session = sqlSessionFactory.openSession();
GoodsDao goodsDao = session.getMapper(GoodsDao.class);
int ids[] = {1,20,4};
List list = goodsDao.queryGoodsByForeach1(ids);
System.out.println(list);
}
@Test
public void queryGoodsByForeach2(){
SqlSession session = sqlSessionFactory.openSession();
GoodsDao goodsDao = session.getMapper(GoodsDao.class);
List list = new ArrayList<>();
list.add(1);
list.add(20);
list.add(14);
List goodsList = goodsDao.queryGoodsByForeach2(list);
System.out.println(goodsList);
}
@Test
public void queryGoodsByForeach3(){
SqlSession session = sqlSessionFactory.openSession();
GoodsDao goodsDao = session.getMapper(GoodsDao.class);
Goods g1= new Goods();
g1.setGoods_id(1);
Goods g2= new Goods();
g2.setGoods_id(20);
Goods g3= new Goods();
g3.setGoods_id(14);
List goods = new ArrayList<>();
goods.add(g1);
goods.add(g2);
goods.add(g3);
List goodsList = goodsDao.queryGoodsByForeach3(goods);
System.out.println(goodsList);
}
}
十、多对一
package com.iotek.pojo;
/**
* @Author:
* @CreateTime: 2023-02-13 15:49
*/
public class Order {
private Integer id;
private double orderNumer;
private double totalamount;
private String orderTime;
private GoodsTwo goodsTwo;
public Order() {
super();
}
public Order(Integer id, double orderNumer, double totalamount, String orderTime, GoodsTwo goodsTwo) {
this.id = id;
this.orderNumer = orderNumer;
this.totalamount = totalamount;
this.orderTime = orderTime;
this.goodsTwo = goodsTwo;
}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public double getOrderNumer() {
return orderNumer;
}
public void setOrderNumer(double orderNumer) {
this.orderNumer = orderNumer;
}
public double getTotalamount() {
return totalamount;
}
public void setTotalamount(double totalamount) {
this.totalamount = totalamount;
}
public String getOrderTime() {
return orderTime;
}
public void setOrderTime(String orderTime) {
this.orderTime = orderTime;
}
public GoodsTwo getGoodsTwo() {
return goodsTwo;
}
public void setGoodsTwo(GoodsTwo goodsTwo) {
this.goodsTwo = goodsTwo;
}
@Override
public String toString() {
return "order{" +
"id=" + id +
", orderNumer=" + orderNumer +
", totalamount=" + totalamount +
", orderTime='" + orderTime + '\'' +
", goodsTwo=" + goodsTwo +
'}';
}
}
package com.iotek.pojo;
import java.util.Set;
/**
* @Author:一的一段维护端
* @CreateTime: 2023-02-13 15:47
*/
public class GoodsTwo {
private Integer gid;
private String goodsname;
private double goodsprice;
private Set orders;//关联关系
public GoodsTwo() {
super();
}
public GoodsTwo(Integer gid, String goodsname, double goodsprice, Set orders) {
this.gid = gid;
this.goodsname = goodsname;
this.goodsprice = goodsprice;
this.orders = orders;
}
public Integer getGid() {
return gid;
}
public void setGid(Integer gid) {
this.gid = gid;
}
public String getGoodsname() {
return goodsname;
}
public void setGoodsname(String goodsname) {
this.goodsname = goodsname;
}
public double getGoodsprice() {
return goodsprice;
}
public void setGoodsprice(double goodsprice) {
this.goodsprice = goodsprice;
}
public Set getOrders() {
return orders;
}
public void setOrders(Set orders) {
this.orders = orders;
}
@Override
public String toString() {
return "GoodsTwo{" +
"gid=" + gid +
", goodsname='" + goodsname + '\'' +
", goodsprice=" + goodsprice +
", orders=" + orders +
'}';
}
}
package com.iotek.DaoTest;
import com.iotek.Dao.GoodsTwoDao;
import com.iotek.Dao.OrderDao;
import com.iotek.pojo.Goods;
import com.iotek.pojo.GoodsTwo;
import com.iotek.pojo.Order;
import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import org.junit.Before;
import org.junit.Test;
import java.io.IOException;
import java.io.InputStream;
import java.util.List;
/**
* @Author:
* @CreateTime: 2023-02-13 16:22
*/
public class OneToMany {
private SqlSessionFactory sqlSessionFactory;
@Before
public void getsessionFactory() throws IOException {
InputStream inputStream = Resources.getResourceAsStream("SqlMapConfig.xml");
SqlSessionFactoryBuilder sqlSessionFactoryBuilder = new SqlSessionFactoryBuilder();
sqlSessionFactory = sqlSessionFactoryBuilder.build(inputStream);
}
@Test
public void ManyToOne1(){
SqlSession session = sqlSessionFactory.openSession();
OrderDao orderDao = session.getMapper(OrderDao.class);
Order order = orderDao.getOrderByIDManyToOne1(1);
System.out.println(order);
}
@Test
public void ManyToOne2(){
SqlSession session = sqlSessionFactory.openSession();
OrderDao orderDao = session.getMapper(OrderDao.class);
Order order = orderDao.getOrderByIDManyToOne2(4);
System.out.println(order);
}
}
十一、一对多
package com.iotek.DaoTest;
import com.iotek.Dao.GoodsTwoDao;
import com.iotek.pojo.GoodsTwo;
import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import org.junit.Before;
import org.junit.Test;
import java.io.IOException;
import java.io.InputStream;
/**
* @Author:
* @CreateTime: 2023-02-13 16:22
*/
public class ManyToOne {
private SqlSessionFactory sqlSessionFactory;
@Before
public void getsessionFactory() throws IOException {
InputStream inputStream = Resources.getResourceAsStream("SqlMapConfig.xml");
SqlSessionFactoryBuilder sqlSessionFactoryBuilder = new SqlSessionFactoryBuilder();
sqlSessionFactory = sqlSessionFactoryBuilder.build(inputStream);
}
@Test
public void OneToMany1(){
SqlSession session = sqlSessionFactory.openSession();
GoodsTwoDao goodsTwoDao = session.getMapper(GoodsTwoDao.class);
GoodsTwo goodsByID = goodsTwoDao.getGoodsByIDOneToMany1(1);
System.out.println(goodsByID);
}
@Test
public void OneToMany2(){
SqlSession session = sqlSessionFactory.openSession();
GoodsTwoDao goodsTwoDao = session.getMapper(GoodsTwoDao.class);
GoodsTwo goodsByID = goodsTwoDao.getGoodsByIDOneToMany2(2);
System.out.println(goodsByID);
}
}
十二、多对多
package com.iotek.pojo;
import java.util.Set;
/**
* @Author:
* @CreateTime: 2023-02-13 23:32
*/
public class Student {
private Integer sid;
private String sname;
private Set courses;
public Student() {
super();
}
public Student(Integer sid, String sname, Set courses) {
this.sid = sid;
this.sname = sname;
this.courses = courses;
}
public Integer getSid() {
return sid;
}
public void setSid(Integer sid) {
this.sid = sid;
}
public String getSname() {
return sname;
}
public void setSname(String sname) {
this.sname = sname;
}
public Set getCourses() {
return courses;
}
public void setCourses(Set courses) {
this.courses = courses;
}
@Override
public String toString() {
return "Student{" +
"sid=" + sid +
", sname='" + sname + '\'' +
", courses=" + courses +
'}';
}
}
package com.iotek.pojo;
/**
* @Author:
* @CreateTime: 2023-02-13 23:28
*/
public class Course {
private Integer cid;
private String cname;
public Course() {
super();
}
public Course(Integer cid, String cname) {
this.cid = cid;
this.cname = cname;
}
public Integer getCid() {
return cid;
}
public void setCid(Integer cid) {
this.cid = cid;
}
public String getCname() {
return cname;
}
public void setCname(String cname) {
this.cname = cname;
}
@Override
public String toString() {
return "Course{" +
"cid=" + cid +
", cname='" + cname + '\'' +
'}';
}
}
package com.iotek.DaoTest;
import com.iotek.Dao.OrderDao;
import com.iotek.Dao.StudentDao;
import com.iotek.pojo.Order;
import com.iotek.pojo.Student;
import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import org.junit.Before;
import org.junit.Test;
import java.io.IOException;
import java.io.InputStream;
/**
* @Author:
* @CreateTime: 2023-02-13 16:22
*/
public class MangToMany {
private SqlSessionFactory sqlSessionFactory;
@Before
public void getsessionFactory() throws IOException {
InputStream inputStream = Resources.getResourceAsStream("SqlMapConfig.xml");
SqlSessionFactoryBuilder sqlSessionFactoryBuilder = new SqlSessionFactoryBuilder();
sqlSessionFactory = sqlSessionFactoryBuilder.build(inputStream);
}
@Test
public void ManytoMany1(){
SqlSession session = sqlSessionFactory.openSession();
StudentDao studentDao = session.getMapper(StudentDao.class);
Student student = studentDao.getStudentByIdManyToMany1(1);
System.out.println(student);
}
}
十三、自查讯
package com.iotek.pojo;
import java.util.Set;
/**
* @Author:
* @CreateTime: 2023-02-13 23:59
*/
public class Newlable {
private int id;
private String name;
private Set newlables;//栏目下所有的子栏目
public Newlable() {
super();
}
public Newlable(int id, String name, Set newlables) {
this.id = id;
this.name = name;
this.newlables = newlables;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Set getNewlables() {
return newlables;
}
public void setNewlables(Set newlables) {
this.newlables = newlables;
}
@Override
public String toString() {
return "Newlable{" +
"id=" + id +
", name='" + name + '\'' +
", newlables=" + newlables +
'}';
}
}
package com.iotek.Dao;
import com.iotek.pojo.Newlable;
import java.util.List;
/**
* @Author:
* @CreateTime: 2023-02-14 00:02
*/
public interface NewlableDao {
public List getChildrenByPid1(int pid);
public List getChildrenByPid2(int pid);
}
package com.iotek.DaoTest;
import com.iotek.Dao.NewlableDao;
import com.iotek.Dao.OrderDao;
import com.iotek.pojo.Newlable;
import com.iotek.pojo.Order;
import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import org.junit.Before;
import org.junit.Test;
import java.io.IOException;
import java.io.InputStream;
import java.util.List;
/**
* @Author:
* @CreateTime: 2023-02-14 00:17
*/
public class SelectOwn {
private SqlSessionFactory sqlSessionFactory;
@Before
public void getsessionFactory() throws IOException {
InputStream inputStream = Resources.getResourceAsStream("SqlMapConfig.xml");
SqlSessionFactoryBuilder sqlSessionFactoryBuilder = new SqlSessionFactoryBuilder();
sqlSessionFactory = sqlSessionFactoryBuilder.build(inputStream);
}
@Test
public void ManyToOne1(){
SqlSession session = sqlSessionFactory.openSession();
NewlableDao newlableDao = session.getMapper(NewlableDao.class);
List newlableList = newlableDao.getChildrenByPid1(2);
System.out.println(newlableList);
}
@Test
public void ManyToOne2(){
SqlSession session = sqlSessionFactory.openSession();
NewlableDao newlableDao = session.getMapper(NewlableDao.class);
List newlableList = newlableDao.getChildrenByPid2(2);
System.out.println(newlableList);
}
}