黑马Mybatis day3 多表查询 1.xml配置方式 2.注解方式

 package com.itheima.mozq;

 import com.itheima.domain.Order;
 import com.itheima.mapper.OrderMapper;
 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;

 public class OneToOneTest {
     OrderMapper mapper;

     @Before
     public void before() throws IOException {
         //加载配置
         InputStream is = Resources.getResourceAsStream("sqlMapConfig.xml");
         //创建SSF
         SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(is);
         //创建SS
         SqlSession sqlSession = sqlSessionFactory.openSession(true);
         mapper = sqlSession.getMapper(OrderMapper.class);
     }

     @Test
     public void testFindAll(){
         List<Order> orderList = mapper.findAll();
         for (Order order : orderList) {
             System.out.println(order);
         }
     }
 }

OneToOneTest

 package com.itheima.mozq;

 import com.itheima.domain.User;
 import com.itheima.mapper.UserMapper;
 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;

 public class OneToManyTest {
     UserMapper mapper;

     @Before
     public void before() throws IOException {
         //加载配置
         InputStream is = Resources.getResourceAsStream("sqlMapConfig.xml");
         //创建SSF
         SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(is);
         //创建SS
         SqlSession sqlSession = sqlSessionFactory.openSession(true);
         mapper = sqlSession.getMapper(UserMapper.class);
     }

     @Test
     public void testFindWithOrder(){
         List<User> userList = mapper.findWithOrder();
         for (User user : userList) {
             System.out.println(user);
         }
     }
 }

OneToManyTest

 package com.itheima.mozq;

 import com.itheima.domain.Order;
 import com.itheima.domain.User;
 import com.itheima.mapper.OrderMapper;
 import com.itheima.mapper.UserMapper;
 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;

 public class ManyToManyTest {
     UserMapper mapper;

     @Before
     public void before() throws IOException {
         //加载配置
         InputStream is = Resources.getResourceAsStream("sqlMapConfig.xml");
         //创建SSF
         SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(is);
         //创建SS
         SqlSession sqlSession = sqlSessionFactory.openSession(true);
         mapper = sqlSession.getMapper(UserMapper.class);
     }

     @Test
     public void testFindWithRole(){
         List<User> userList = mapper.findWithRole();
         for (User user : userList) {
             System.out.println(user);
         }
     }
 }

ManyToManyTest

 <?xml version="1.0" encoding="UTF-8" ?>
 <!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd">
 <configuration>

     <!--通过properties标签加载外部properties文件-->
     <properties resource="jdbc.properties"></properties>

     <!--自定义别名-->
     <typeAliases>
         <typeAlias type="com.itheima.domain.User" alias="User"></typeAlias>
         <typeAlias type="com.itheima.domain.Role" alias="Role"></typeAlias>
         <typeAlias type="com.itheima.domain.Order" alias="Order"></typeAlias>
     </typeAliases>

     <!--数据源环境-->
     <environments default="developement">
         <environment id="developement">
             <transactionManager type="JDBC"></transactionManager>
             <dataSource type="POOLED">
                 <property name="driver" value="${jdbc.driver}"/>
                 <property name="url" value="${jdbc.url}"/>
                 <property name="username" value="${jdbc.username}"/>
                 <property name="password" value="${jdbc.password}"/>
             </dataSource>
         </environment>
     </environments>

     <!--设置映射关系-->
     <mappers>
         <!--指定接口所在的包-->
         <package name="com.itheima.mapper"></package>
     </mappers>

 </configuration>

sqlMapConfig.xml

 ### direct log messages to stdout ###
 log4j.appender.stdout=org.apache.log4j.ConsoleAppender
 log4j.appender.stdout.Target=System.err
 log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
 log4j.appender.stdout.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1}:%L - %m%n

 ### direct messages to file mylog.log ###
 log4j.appender.file=org.apache.log4j.FileAppender
 log4j.appender.file.File=c:/mylog.log
 log4j.appender.file.layout=org.apache.log4j.PatternLayout
 log4j.appender.file.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1}:%L - %m%n

 ### set log levels - for more verbose logging change 'info' to 'debug' ###

 log4j.rootLogger=debug, stdout

log4j.properties

 jdbc.driver=com.mysql.jdbc.Driver
 jdbc.url=jdbc:mysql://localhost:3307/test
 jdbc.username=root
 jdbc.password=root

jdbc.properties

 package com.itheima.mapper;

 import com.itheima.domain.Order;
 import com.itheima.domain.User;
 import org.apache.ibatis.annotations.One;
 import org.apache.ibatis.annotations.Result;
 import org.apache.ibatis.annotations.Results;
 import org.apache.ibatis.annotations.Select;

 import java.util.List;

 public interface OrderMapper {

     @Select("select * from orders")
     @Results({
         @Result(column = "id", property = "id"),
         @Result(column = "ordertime", property = "ordertime"),
         @Result(column = "total", property = "total"),
         @Result(
                 column = "uid",
                 property = "user",
                 javaType = User.class,
                 one = @One(select = "com.itheima.mapper.UserMapper.findById"))

     })
     List<Order> findAll();

     @Select("select * from orders where uid=#{uid}")
     List<Order> findByUid(int uid);
 }

OrderMapper

 package com.itheima.mapper;

 import com.itheima.domain.Role;
 import org.apache.ibatis.annotations.Select;

 import java.util.List;

 public interface RoleMapper {

     @Select("select * from (select ur.roleId from sys_user_role ur where ur.userId = #{uid}) as t1 left join sys_role t2 on t1.roleId=t2.id;")
     List<Role> findByUid(int uid);
 }

RoleMapper

 package com.itheima.mapper;

 import com.itheima.domain.User;
 import org.apache.ibatis.annotations.*;

 import java.util.List;

 public interface UserMapper {

     @Insert("insert into user(username, password, birthday) values(#{username}, #{password}, #{birthday})")
     void save(User user);

     @Delete("delete from user where id=#{id}")
     void delete(int id);

     @Update("update user set username=#{username}, password=#{password}, birthday=#{birthday} where id=#{id}")
     void update(User user);

     @Select("select * from user")
     List<User> findAll();

     @Select("select * from user where id=#{id}")
     List<User> findById(int id);

     @Select("select * from user")
     @Results({
             @Result(id=true ,column = "id", property = "id"),
             @Result(column = "username", property = "username"),
             @Result(column = "password", property = "password"),
             @Result(column = "birthday", property = "birthday"),
             @Result(
                     column = "id",
                     property = "orderList",
                     javaType = List.class,
                     many = @Many(select = "com.itheima.mapper.OrderMapper.findByUid")
             )
     })
     List<User> findWithOrder();

     @Select("select * from user")
     @Results({
             @Result(id=true ,column = "id", property = "id"),
             @Result(column = "username", property = "username"),
             @Result(column = "password", property = "password"),
             @Result(column = "birthday", property = "birthday"),
             @Result(
                     column = "id",
                     property = "roleList",
                     javaType = List.class,
                     many = @Many(select = "com.itheima.mapper.RoleMapper.findByUid")
             )
     })
     List<User> findWithRole();

 }

UserMapper

 package com.itheima.domain;

 import java.util.Date;

 public class Order {

     private int id;
     private Date ordertime;
     private double total;

     //当前订单属于哪一个用户
     private User user;

     public int getId() {
         return id;
     }

     public void setId(int id) {
         this.id = id;
     }

     public Date getOrdertime() {
         return ordertime;
     }

     public void setOrdertime(Date ordertime) {
         this.ordertime = ordertime;
     }

     public double getTotal() {
         return total;
     }

     public void setTotal(double total) {
         this.total = total;
     }

     public User getUser() {
         return user;
     }

     public void setUser(User user) {
         this.user = user;
     }

     @Override
     public String toString() {
         return "Order{" +
                 "id=" + id +
                 ", ordertime=" + ordertime +
                 ", total=" + total +
                 ", user=" + user +
                 '}';
     }
 }

Order

 package com.itheima.domain;

 public class Role {

     private int id;
     private String roleName;
     private String roleDesc;

     public int getId() {
         return id;
     }

     public void setId(int id) {
         this.id = id;
     }

     public String getRoleName() {
         return roleName;
     }

     public void setRoleName(String roleName) {
         this.roleName = roleName;
     }

     public String getRoleDesc() {
         return roleDesc;
     }

     public void setRoleDesc(String roleDesc) {
         this.roleDesc = roleDesc;
     }

     @Override
     public String toString() {
         return "Role{" +
                 "id=" + id +
                 ", roleName='" + roleName + '\'' +
                 ", roleDesc='" + roleDesc + '\'' +
                 '}';
     }
 }

Role

 package com.itheima.domain;

 import java.util.Date;
 import java.util.List;

 public class User {

     private int id;
     private String username;
     private String password;
     private Date birthday;

     //当前用户具备哪些角色
     private List<Role> roleList;

     public List<Role> getRoleList() {
         return roleList;
     }

     public void setRoleList(List<Role> roleList) {
         this.roleList = roleList;
     }

     //描述的是当前用户具有的订单
     private List<Order> orderList;
     public List<Order> getOrderList() {
         return orderList;
     }
     public void setOrderList(List<Order> orderList) {
         this.orderList = orderList;
     }

     public Date getBirthday() {
         return birthday;
     }

     public void setBirthday(Date birthday) {
         this.birthday = birthday;
     }

     public int getId() {
         return id;
     }

     public void setId(int id) {
         this.id = id;
     }

     public String getUsername() {
         return username;
     }

     public void setUsername(String username) {
         this.username = username;
     }

     public String getPassword() {
         return password;
     }

     public void setPassword(String password) {
         this.password = password;
     }

     @Override
     public String toString() {
         return "User{" +
                 "id=" + id +
                 ", username='" + username + '\'' +
                 ", password='" + password + '\'' +
                 ", birthday=" + birthday +
                 ", roleList=" + roleList +
                 ", orderList=" + orderList +
                 '}';
     }
 }

User