所需要用到的其他工具或技術(shù):
項目管理工具 : Maven
測試運行工具 : Junit
數(shù)據(jù)庫 : Derby
Maven Dependencies:
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
|
<dependencies> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis</artifactId> <version>3.2.7</version> </dependency> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>4.9</version> <scope>test</scope> </dependency> <dependency> <groupId>org.apache.derby</groupId> <artifactId>derby</artifactId> <version>10.10.2.0</version> </dependency> <dependency> <groupId>org.apache.derby</groupId> <artifactId>derbyclient</artifactId> <version>10.10.2.0</version> </dependency> </dependencies> |
SQL 建表及數(shù)據(jù)插入（新建一個USER_TEST_TB_RELATIONSHIP表，然后CopyUSER_TEST_TB的數(shù)據(jù)，Derby不支持表結(jié)構(gòu)中列名的修改，只能這么做了）:
|
1
2
3
4
5
6
7
|
CREATE TABLE USER_TEST_TB_RELATIONSHIP( USER_ID INT PRIMARY KEY, USER_USERNAME VARCHAR(20) NOT NULL, USER_PASSWORD VARCHAR(20) NOT NULL, USER_NICKNAME VARCHAR(20) NOT NULL ); INSERT INTO USER_TEST_TB_RELATIONSHIP(USER_ID,USER_USERNAME,USER_PASSWORD,USER_NICKNAME) SELECT ID,USERNAME,PASSWORD,NICKNAME FROM USER_TEST_TB; |
Mybatis配置文件 src/main/resource源目錄下
test-mybatis-configuration.xml
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
|
<?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> <properties> <property name="driver" value="org.apache.derby.jdbc.ClientDriver" /> <property name="url" value="jdbc:derby://localhost:1527/bjpowernode;create=true" /> </properties> <environments default="development"> <environment id="development"> <transactionManager type="JDBC" /> <dataSource type="POOLED"> <property name="driver" value="${driver}" /> <property name="url" value="${url}" /> </dataSource> </environment> </environments> <mappers> <mapper resource="com/bjpowernode/practice/UserMapper.xml" /> </mappers> </configuration> |
User.java對象類(src/main/java/com/bjpowernode/practice目錄下)
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
|
package com.bjpowernode.practice; public class User { private Integer id; private String username; private String password; private String nickname; public Integer getId() { return id; } public void setId(Integer 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; } public String getNickname() { return nickname; } public void setNickname(String nickname) { this.nickname = nickname; } } |
UserMapper.xml Mapper文件（src/main/java/com.bjpowernode.practice目錄下）
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
|
<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd"> <mapper namespace="com.bjpowernode.practice.UserMapper"> <!-- 對象屬性和表字段的對應(yīng) --> <resultMap id="userResultMap" type="com.bjpowernode.practice.User"> <result property="id" column="USER_ID"/> <result property="username" column="USER_USERNAME"/> <result property="password" column="USER_PASSWORD"/> <result property="nickname" column="USER_NICKNAME"/> </resultMap> <select id="getUser" resultMap="userResultMap"> select * from USER_TEST_TB_RELATIONSHIP </select> </mapper> |
UserMapper.java Mapper類（src/main/java/com.bjpowernode.practice目錄下）
|
1
2
3
4
5
6
|
package com.bjpowernode.practice; import java.util.List; public interface UserMapper { public List<User> getUser(); } |
測試類TestMyBatis.Java（src/test/java/com.bjpowernode.practice目錄下）
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
|
package com.bjpowernode.practice; import java.io.InputStream; import java.text.MessageFormat; import java.util.List; 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; public class TestMyBatis { private String source; private InputStream inputStream; private SqlSessionFactory sqlSessionFactory; @Before public void setUp() { /** * 準備Mybatis運行環(huán)境 */ source = "test-mybatis-configuration.xml"; inputStream = TestMyBatis.class.getClassLoader().getResourceAsStream(source); sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream); } @Test public void testGet() { try { // 獲取Session連接 SqlSession session = sqlSessionFactory.openSession(); // 獲取Mapper UserMapper userMapper = session.getMapper(UserMapper.class); // 顯示User信息 System.out.println("Test Get start..."); this.printUsers(userMapper.getUser()); System.out.println("Test Get finished..."); } catch (Exception e) { e.printStackTrace(); } } /** * * 打印用戶信息到控制臺 * * @param users */ private void printUsers(final List<User> users) { int count = 0; for (User user : users) { System.out.println(MessageFormat.format("==User[{0}]=================", ++count)); System.out.println("User Id: " + user.getId()); System.out.println("User UserName: " + user.getUsername()); System.out.println("User Password: " + user.getPassword()); System.out.println("User nickname: " + user.getNickname()); } } } |
總結(jié)
以上所述是小編給大家介紹的mybatis實現(xiàn)表與對象的關(guān)聯(lián)關(guān)系_動力節(jié)點Java學(xué)院整理，希望對大家有所幫助，如果大家有任何疑問請給我留言，小編會及時回復(fù)大家的。在此也非常感謝大家對服務(wù)器之家網(wǎng)站的支持！
