MyBatis使用详解

Chapter3-2-8/src/main/java/com/didispace/Application.java

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+package com.didispace;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class Application {
+
+	public static void main(String[] args) {
+		SpringApplication.run(Application.class, args);
+	}
+
+}

Chapter3-2-8/src/main/java/com/didispace/domain/User.java

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+package com.didispace.domain;
+
+public class User {
+
+    private Long id;
+    private String name;
+    private Integer age;
+
+    public User() {
+    }
+
+    public User(Long id, String name, Integer age) {
+        this.id = id;
+        this.name = name;
+        this.age = age;
+    }
+
+    public User(String name, Integer age) {
+        this.name = name;
+        this.age = age;
+    }
+
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public Integer getAge() {
+        return age;
+    }
+
+    public void setAge(Integer age) {
+        this.age = age;
+    }
+
+}

Chapter3-2-8/src/main/java/com/didispace/domain/UserMapper.java

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+package com.didispace.domain;
+
+import org.apache.ibatis.annotations.*;
+
+import java.util.List;
+import java.util.Map;
+
+@Mapper
+public interface UserMapper {
+
+    @Select("SELECT * FROM user WHERE name = #{name}")
+    User findByName(@Param("name") String name);
+
+    @Results({
+            @Result(property = "name", column = "name"),
+            @Result(property = "age", column = "age")
+    })
+    @Select("SELECT name, age FROM user")
+    List<User> findAll();
+
+    @Insert("INSERT INTO user(name, age) VALUES(#{name}, #{age})")
+    int insert(@Param("name") String name, @Param("age") Integer age);
+
+    @Update("UPDATE user SET age=#{age} WHERE name=#{name}")
+    void update(User user);
+
+    @Delete("DELETE FROM user WHERE id =#{id}")
+    void delete(Long id);
+
+    @Insert("INSERT INTO user(name, age) VALUES(#{name}, #{age})")
+    int insertByUser(User user);
+
+    @Insert("INSERT INTO user(name, age) VALUES(#{name,jdbcType=VARCHAR}, #{age,jdbcType=INTEGER})")
+    int insertByMap(Map<String, Object> map);
+
+}

Chapter3-2-8/src/main/resources/application.properties

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+spring.datasource.url=jdbc:mysql://localhost:3306/test
+spring.datasource.username=root
+spring.datasource.password=123456
+spring.datasource.driver-class-name=com.mysql.jdbc.Driver

Chapter3-2-8/src/test/java/com/didispace/ApplicationTests.java

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+package com.didispace;
+
+import com.didispace.domain.User;
+import com.didispace.domain.UserMapper;
+import org.junit.Assert;
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.SpringApplicationConfiguration;
+import org.springframework.test.annotation.Rollback;
+import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
+import org.springframework.transaction.annotation.Transactional;
+
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+
+@RunWith(SpringJUnit4ClassRunner.class)
+@SpringApplicationConfiguration(classes = Application.class)
+@Transactional
+public class ApplicationTests {
+
+	@Autowired
+	private UserMapper userMapper;
+
+	@Test
+	@Rollback
+	public void testUserMapper() throws Exception {
+		// insert一条数据，并select出来验证
+		userMapper.insert("AAA", 20);
+		User u = userMapper.findByName("AAA");
+		Assert.assertEquals(20, u.getAge().intValue());
+		// update一条数据，并select出来验证
+		u.setAge(30);
+		userMapper.update(u);
+		u = userMapper.findByName("AAA");
+		Assert.assertEquals(30, u.getAge().intValue());
+		// 删除这条数据，并select验证
+		userMapper.delete(u.getId());
+		u = userMapper.findByName("AAA");
+		Assert.assertEquals(null, u);
+
+		u = new User("BBB", 30);
+		userMapper.insertByUser(u);
+		Assert.assertEquals(30, userMapper.findByName("BBB").getAge().intValue());
+
+		Map<String, Object> map = new HashMap<>();
+		map.put("name", "CCC");
+		map.put("age", 40);
+		userMapper.insertByMap(map);
+		Assert.assertEquals(40, userMapper.findByName("CCC").getAge().intValue());
+
+		List<User> userList = userMapper.findAll();
+		for(User user : userList) {
+			Assert.assertEquals(null, user.getId());
+			Assert.assertNotEquals(null, user.getName());
+		}
+
+	}
+
+}