SpringBoot整合Mybatisplus3.x之CRUD(一)
pom.xml
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</dependency>
<dependency>
<groupId>com.baomidou</groupId>
<artifactId>mybatis-plus-boot-starter</artifactId>
<version>3.2.0</version>
</dependency>
<dependency>
<groupId>com.h2database</groupId>
<artifactId>h2</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>p6spy</groupId>
<artifactId>p6spy</artifactId>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>application.yml
# DataSource Config
spring:
datasource:
driver-class-name: org.h2.Driver
url: jdbc:h2:tcp://192.168.180.115:19200/~/mem/test
username: root
password: test
# Logger Config
logging:
level:
com.mp.crud: debug
dao层
public interface UserMapper extends BaseMapper<User> {
}实体类
@Data
@Accessors(chain = true)
@TableName("user")
public class User {
private Long id;
private String name;
private Integer age;
private String email;
@TableField(exist = false)
private Integer count;
}
配置类
@Configuration
@MapperScan("com.mp.crud.mapper")
public class MybatisPlusConfig {
}
测试类
@SpringBootTest
@RunWith(SpringRunner.class)
class CrudApplicationTests {
@Resource
private UserMapper mapper;
@Test
public void aInsert() {
User user = new User();
user.setName("小羊");
user.setAge(3);
user.setEmail("abc@mp.com");
assertThat(mapper.insert(user)).isGreaterThan(0);
// 成功直接拿会写的 ID
assertThat(user.getId()).isNotNull();
}
@Test
public void bDelete() {
assertThat(mapper.deleteById(3L)).isGreaterThan(0);
assertThat(mapper.delete(new QueryWrapper<User>()
.lambda().eq(User::getName, "Sandy"))).isGreaterThan(0);
}
@Test
public void cUpdate() {
//UPDATE user SET email=? WHERE id=?
assertThat(mapper.updateById(new User().setId(1L).setEmail("ab@c.c"))).isGreaterThan(0);
//UPDATE user SET name=?, age=? WHERE (id = ?)
assertThat(
mapper.update(
new User().setName("mp"),
Wrappers.<User>lambdaUpdate()
.set(User::getAge, 3)
.eq(User::getId, 2)
)
).isGreaterThan(0);
User user = mapper.selectById(2);
assertThat(user.getAge()).isEqualTo(3);
assertThat(user.getName()).isEqualTo("mp");
mapper.update(
null,
Wrappers.<User>lambdaUpdate().set(User::getEmail, null).eq(User::getId, 2)
);
assertThat(mapper.selectById(1).getEmail()).isEqualTo("ab@c.c");
user = mapper.selectById(2);
assertThat(user.getEmail()).isNull();
assertThat(user.getName()).isEqualTo("mp");
mapper.update(
new User().setEmail("miemie@baomidou.com"),
new QueryWrapper<User>()
.lambda().eq(User::getId, 2)
);
user = mapper.selectById(2);
assertThat(user.getEmail()).isEqualTo("miemie@baomidou.com");
mapper.update(
new User().setEmail("miemie2@baomidou.com"),
Wrappers.<User>lambdaUpdate()
.set(User::getAge, null)
.eq(User::getId, 2)
);
user = mapper.selectById(2);
assertThat(user.getEmail()).isEqualTo("miemie2@baomidou.com");
assertThat(user.getAge()).isNull();
}
@Test
public void dSelect() {
mapper.insert(
new User().setId(10086L)
.setName("miemie")
.setEmail("miemie@baomidou.com")
.setAge(3));
assertThat(mapper.selectById(10086L).getEmail()).isEqualTo("miemie@baomidou.com");
User user = mapper.selectOne(new QueryWrapper<User>().lambda().eq(User::getId, 10086));
assertThat(user.getName()).isEqualTo("miemie");
assertThat(user.getAge()).isEqualTo(3);
List<User> users = mapper.selectList(Wrappers.<User>lambdaQuery().select(User::getId));
System.out.println(users);
mapper.selectList(Wrappers.<User>lambdaQuery().select(User::getId))
.forEach(x -> {
assertThat(x.getId()).isNotNull();
assertThat(x.getEmail()).isNull();
assertThat(x.getName()).isNull();
assertThat(x.getAge()).isNull();
});
mapper.selectList(new QueryWrapper<User>().select("id", "name"))
.forEach(x -> {
assertThat(x.getId()).isNotNull();
assertThat(x.getEmail()).isNull();
assertThat(x.getName()).isNotNull();
assertThat(x.getAge()).isNull();
});
}
@Test
public void orderBy() {
List<User> users = mapper.selectList(Wrappers.<User>query().orderByAsc("age"));
System.out.println(users);
//assertThat(users).isNotEmpty();
}
@Test
public void selectMaps() {
List<Map<String, Object>> mapList = mapper.selectMaps(Wrappers.<User>query().orderByAsc("age"));
assertThat(mapList).isNotEmpty();
assertThat(mapList.get(0)).isNotEmpty();
//{ID=1189005852158324737, EMAIL=abc@mp.com, NAME=小羊, AGE=3}
System.out.println(mapList.get(0));
}
@Test
public void selectMapsPage() {
IPage<Map<String, Object>> page = mapper.selectMapsPage(new Page<>(1, 5), Wrappers.<User>query().orderByAsc("age"));
assertThat(page).isNotNull();
assertThat(page.getRecords()).isNotEmpty();
assertThat(page.getRecords().get(0)).isNotEmpty();
}
@Test
public void orderByLambda() {
//SELECT id,name,email,age FROM user ORDER BY age ASC
List<User> users = mapper.selectList(Wrappers.<User>lambdaQuery().orderByAsc(User::getAge));
List<User> users1 = mapper.selectList(Wrappers.<User>query().orderByAsc("age"));
System.out.println(users1);
//assertThat(users).isNotEmpty();
}
@Test
public void testSelectMaxId() {
// SELECT max(id) as id FROM user
QueryWrapper<User> wrapper = new QueryWrapper<>();
wrapper.select("max(id) as id");
//User(id=1189005852158324737, name=null, age=null, email=null, count=null)
User user = mapper.selectOne(wrapper);
System.out.println(user);
System.out.println("maxId=" + user.getId());
List<User> users = mapper.selectList(Wrappers.<User>lambdaQuery().orderByDesc(User::getId));
Assert.assertEquals(user.getId().longValue(), users.get(0).getId().longValue());
}
@Test
public void testGroup() {
QueryWrapper<User> wrapper = new QueryWrapper<>();
wrapper.select("age, count(*)")
.groupBy("age");
List<Map<String, Object>> maplist = mapper.selectMaps(wrapper);
for (Map<String, Object> mp : maplist) {
System.out.println(mp);
}
/**
* lambdaQueryWrapper groupBy orderBy
*/
LambdaQueryWrapper<User> lambdaQueryWrapper = new QueryWrapper<User>().lambda()
.select(User::getAge)
.groupBy(User::getAge)
.orderByAsc(User::getAge);
for (User user : mapper.selectList(lambdaQueryWrapper)) {
System.out.println(user);
}
}
@Test
public void testTableFieldExistFalse(){
QueryWrapper<User> wrapper = new QueryWrapper<>();
wrapper.select("age, count(age) as count")
.groupBy("age");
List<User> list = mapper.selectList(wrapper);
list.forEach(System.out::println);
list.forEach(x->{
Assert.assertNull(x.getId());
Assert.assertNotNull(x.getAge());
Assert.assertNotNull(x.getCount());
});
mapper.insert(
new User().setId(10088L)
.setName("miemie")
.setEmail("miemie@baomidou.com")
.setAge(3));
User miemie = mapper.selectById(10088L);
Assert.assertNotNull(miemie);
}
}
测试结果(我处只运行了部分的测试方法)
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