黑马Mybatis day3 多表查询 1.xml配置方式 2.注解方式

 1 package com.itheima.mozq;
 2 
 3 import com.itheima.domain.Order;
 4 import com.itheima.mapper.OrderMapper;
 5 import org.apache.ibatis.io.Resources;
 6 import org.apache.ibatis.session.SqlSession;
 7 import org.apache.ibatis.session.SqlSessionFactory;
 8 import org.apache.ibatis.session.SqlSessionFactoryBuilder;
 9 import org.junit.Before;
10 import org.junit.Test;
11 
12 import java.io.IOException;
13 import java.io.InputStream;
14 import java.util.List;
15 
16 
17 public class OneToOneTest {
18     OrderMapper mapper;
19 
20     @Before
21     public void before() throws IOException {
22         //加载配置
23         InputStream is = Resources.getResourceAsStream("sqlMapConfig.xml");
24         //创建SSF
25         SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(is);
26         //创建SS
27         SqlSession sqlSession = sqlSessionFactory.openSession(true);
28         mapper = sqlSession.getMapper(OrderMapper.class);
29     }
30 
31     @Test
32     public void testFindAll(){
33         List<Order> orderList = mapper.findAll();
34         for (Order order : orderList) {
35             System.out.println(order);
36         }
37     }
38 }

OneToOneTest

 1 package com.itheima.mozq;
 2 
 3 import com.itheima.domain.User;
 4 import com.itheima.mapper.UserMapper;
 5 import org.apache.ibatis.io.Resources;
 6 import org.apache.ibatis.session.SqlSession;
 7 import org.apache.ibatis.session.SqlSessionFactory;
 8 import org.apache.ibatis.session.SqlSessionFactoryBuilder;
 9 import org.junit.Before;
10 import org.junit.Test;
11 
12 import java.io.IOException;
13 import java.io.InputStream;
14 import java.util.List;
15 
16 public class OneToManyTest {
17     UserMapper mapper;
18 
19     @Before
20     public void before() throws IOException {
21         //加载配置
22         InputStream is = Resources.getResourceAsStream("sqlMapConfig.xml");
23         //创建SSF
24         SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(is);
25         //创建SS
26         SqlSession sqlSession = sqlSessionFactory.openSession(true);
27         mapper = sqlSession.getMapper(UserMapper.class);
28     }
29 
30     @Test
31     public void testFindWithOrder(){
32         List<User> userList = mapper.findWithOrder();
33         for (User user : userList) {
34             System.out.println(user);
35         }
36     }
37 }

OneToManyTest

 1 package com.itheima.mozq;
 2 
 3 import com.itheima.domain.Order;
 4 import com.itheima.domain.User;
 5 import com.itheima.mapper.OrderMapper;
 6 import com.itheima.mapper.UserMapper;
 7 import org.apache.ibatis.io.Resources;
 8 import org.apache.ibatis.session.SqlSession;
 9 import org.apache.ibatis.session.SqlSessionFactory;
10 import org.apache.ibatis.session.SqlSessionFactoryBuilder;
11 import org.junit.Before;
12 import org.junit.Test;
13 
14 import java.io.IOException;
15 import java.io.InputStream;
16 import java.util.List;
17 
18 public class ManyToManyTest {
19     UserMapper mapper;
20 
21     @Before
22     public void before() throws IOException {
23         //加载配置
24         InputStream is = Resources.getResourceAsStream("sqlMapConfig.xml");
25         //创建SSF
26         SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(is);
27         //创建SS
28         SqlSession sqlSession = sqlSessionFactory.openSession(true);
29         mapper = sqlSession.getMapper(UserMapper.class);
30     }
31 
32     @Test
33     public void testFindWithRole(){
34         List<User> userList = mapper.findWithRole();
35         for (User user : userList) {
36             System.out.println(user);
37         }
38     }
39 }

ManyToManyTest

 1 <?xml version="1.0" encoding="UTF-8" ?>
 2 <!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd">
 3 <configuration>
 4 
 5     <!--通过properties标签加载外部properties文件-->
 6     <properties resource="jdbc.properties"></properties>
 7 
 8     <!--自定义别名-->
 9     <typeAliases>
10         <typeAlias type="com.itheima.domain.User" alias="User"></typeAlias>
11         <typeAlias type="com.itheima.domain.Role" alias="Role"></typeAlias>
12         <typeAlias type="com.itheima.domain.Order" alias="Order"></typeAlias>
13     </typeAliases>
14 
15     <!--数据源环境-->
16     <environments default="developement">
17         <environment id="developement">
18             <transactionManager type="JDBC"></transactionManager>
19             <dataSource type="POOLED">
20                 <property name="driver" value="${jdbc.driver}"/>
21                 <property name="url" value="${jdbc.url}"/>
22                 <property name="username" value="${jdbc.username}"/>
23                 <property name="password" value="${jdbc.password}"/>
24             </dataSource>
25         </environment>
26     </environments>
27     
28 
29     <!--设置映射关系-->
30     <mappers>
31         <!--指定接口所在的包-->
32         <package name="com.itheima.mapper"></package>
33     </mappers>
34 
35 
36 </configuration>

sqlMapConfig.xml

 1 ### direct log messages to stdout ###
 2 log4j.appender.stdout=org.apache.log4j.ConsoleAppender
 3 log4j.appender.stdout.Target=System.err
 4 log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
 5 log4j.appender.stdout.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1}:%L - %m%n
 6 
 7 ### direct messages to file mylog.log ###
 8 log4j.appender.file=org.apache.log4j.FileAppender
 9 log4j.appender.file.File=c:/mylog.log
10 log4j.appender.file.layout=org.apache.log4j.PatternLayout
11 log4j.appender.file.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1}:%L - %m%n
12 
13 ### set log levels - for more verbose logging change 'info' to 'debug' ###
14 
15 log4j.rootLogger=debug, stdout

log4j.properties

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

jdbc.properties

 1 package com.itheima.mapper;
 2 
 3 import com.itheima.domain.Order;
 4 import com.itheima.domain.User;
 5 import org.apache.ibatis.annotations.One;
 6 import org.apache.ibatis.annotations.Result;
 7 import org.apache.ibatis.annotations.Results;
 8 import org.apache.ibatis.annotations.Select;
 9 
10 import java.util.List;
11 
12 public interface OrderMapper {
13 
14     @Select("select * from orders")
15     @Results({
16         @Result(column = "id", property = "id"),
17         @Result(column = "ordertime", property = "ordertime"),
18         @Result(column = "total", property = "total"),
19         @Result(
20                 column = "uid",
21                 property = "user",
22                 javaType = User.class,
23                 one = @One(select = "com.itheima.mapper.UserMapper.findById"))
24 
25     })
26     List<Order> findAll();
27 
28     @Select("select * from orders where uid=#{uid}")
29     List<Order> findByUid(int uid);
30 }

OrderMapper

 1 package com.itheima.mapper;
 2 
 3 import com.itheima.domain.Role;
 4 import org.apache.ibatis.annotations.Select;
 5 
 6 import java.util.List;
 7 
 8 public interface RoleMapper {
 9 
10     @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;")
11     List<Role> findByUid(int uid);
12 }

RoleMapper

 1 package com.itheima.mapper;
 2 
 3 import com.itheima.domain.User;
 4 import org.apache.ibatis.annotations.*;
 5 
 6 import java.util.List;
 7 
 8 public interface UserMapper {
 9 
10     @Insert("insert into user(username, password, birthday) values(#{username}, #{password}, #{birthday})")
11     void save(User user);
12 
13     @Delete("delete from user where id=#{id}")
14     void delete(int id);
15 
16     @Update("update user set username=#{username}, password=#{password}, birthday=#{birthday} where id=#{id}")
17     void update(User user);
18 
19     @Select("select * from user")
20     List<User> findAll();
21 
22     @Select("select * from user where id=#{id}")
23     List<User> findById(int id);
24 
25     @Select("select * from user")
26     @Results({
27             @Result(id=true ,column = "id", property = "id"),
28             @Result(column = "username", property = "username"),
29             @Result(column = "password", property = "password"),
30             @Result(column = "birthday", property = "birthday"),
31             @Result(
32                     column = "id",
33                     property = "orderList",
34                     javaType = List.class,
35                     many = @Many(select = "com.itheima.mapper.OrderMapper.findByUid")
36             )
37     })
38     List<User> findWithOrder();
39 
40     @Select("select * from user")
41     @Results({
42             @Result(id=true ,column = "id", property = "id"),
43             @Result(column = "username", property = "username"),
44             @Result(column = "password", property = "password"),
45             @Result(column = "birthday", property = "birthday"),
46             @Result(
47                     column = "id",
48                     property = "roleList",
49                     javaType = List.class,
50                     many = @Many(select = "com.itheima.mapper.RoleMapper.findByUid")
51             )
52     })
53     List<User> findWithRole();
54 
55 }

UserMapper

 1 package com.itheima.domain;
 2 
 3 import java.util.Date;
 4 
 5 public class Order {
 6 
 7     private int id;
 8     private Date ordertime;
 9     private double total;
10 
11     //当前订单属于哪一个用户
12     private User user;
13 
14     public int getId() {
15         return id;
16     }
17 
18     public void setId(int id) {
19         this.id = id;
20     }
21 
22     public Date getOrdertime() {
23         return ordertime;
24     }
25 
26     public void setOrdertime(Date ordertime) {
27         this.ordertime = ordertime;
28     }
29 
30     public double getTotal() {
31         return total;
32     }
33 
34     public void setTotal(double total) {
35         this.total = total;
36     }
37 
38     public User getUser() {
39         return user;
40     }
41 
42     public void setUser(User user) {
43         this.user = user;
44     }
45 
46     @Override
47     public String toString() {
48         return "Order{" +
49                 "id=" + id +
50                 ", ordertime=" + ordertime +
51                 ", total=" + total +
52                 ", user=" + user +
53                 '}';
54     }
55 }

Order

 1 package com.itheima.domain;
 2 
 3 public class Role {
 4 
 5     private int id;
 6     private String roleName;
 7     private String roleDesc;
 8 
 9     public int getId() {
10         return id;
11     }
12 
13     public void setId(int id) {
14         this.id = id;
15     }
16 
17     public String getRoleName() {
18         return roleName;
19     }
20 
21     public void setRoleName(String roleName) {
22         this.roleName = roleName;
23     }
24 
25     public String getRoleDesc() {
26         return roleDesc;
27     }
28 
29     public void setRoleDesc(String roleDesc) {
30         this.roleDesc = roleDesc;
31     }
32 
33     @Override
34     public String toString() {
35         return "Role{" +
36                 "id=" + id +
37                 ", roleName='" + roleName + '\'' +
38                 ", roleDesc='" + roleDesc + '\'' +
39                 '}';
40     }
41 }

Role

 1 package com.itheima.domain;
 2 
 3 import java.util.Date;
 4 import java.util.List;
 5 
 6 public class User {
 7 
 8     private int id;
 9     private String username;
10     private String password;
11     private Date birthday;
12 
13     //当前用户具备哪些角色
14     private List<Role> roleList;
15 
16     public List<Role> getRoleList() {
17         return roleList;
18     }
19 
20     public void setRoleList(List<Role> roleList) {
21         this.roleList = roleList;
22     }
23 
24     //描述的是当前用户具有的订单
25     private List<Order> orderList;
26     public List<Order> getOrderList() {
27         return orderList;
28     }
29     public void setOrderList(List<Order> orderList) {
30         this.orderList = orderList;
31     }
32 
33     public Date getBirthday() {
34         return birthday;
35     }
36 
37     public void setBirthday(Date birthday) {
38         this.birthday = birthday;
39     }
40 
41     public int getId() {
42         return id;
43     }
44 
45     public void setId(int id) {
46         this.id = id;
47     }
48 
49     public String getUsername() {
50         return username;
51     }
52 
53     public void setUsername(String username) {
54         this.username = username;
55     }
56 
57     public String getPassword() {
58         return password;
59     }
60 
61     public void setPassword(String password) {
62         this.password = password;
63     }
64 
65     @Override
66     public String toString() {
67         return "User{" +
68                 "id=" + id +
69                 ", username='" + username + '\'' +
70                 ", password='" + password + '\'' +
71                 ", birthday=" + birthday +
72                 ", roleList=" + roleList +
73                 ", orderList=" + orderList +
74                 '}';
75     }
76 }

User

黑马Mybatis day3 多表查询 1.xml配置方式 2.注解方式

猜你喜欢