Spring Boot 整合原生的 mybatis
Mybatis简介
MyBatis 是一款优秀的持久层框架，它支持定制化 SQL、存储过程以及高级映射。MyBatis 避免了几乎所有的 JDBC 代码和手动设置参数以及获取结果集的工作。MyBatis 可以使用简单的 XML 或注解来配置和映射原生信息，将接口和 Java 的 POJOs (Plain Old Java Objects, 普通的 Java 对象) 映射成数据库中的记录。
核心特点
1、简化数据库操作：
-
MyBatis 通过 XML 或注解配置 SQL 语句，避免了繁琐的 JDBC 代码。
-
开发者只需关注 SQL 本身，而不需要处理连接、预编译语句、结果集等底层细节。
2、灵活的 SQL 映射：
-
支持动态 SQL，可以根据条件生成不同的 SQL 语句。
-
提供强大的映射功能，支持将查询结果直接映射为 Java 对象或集合。
3、与 Spring 集成：
- MyBatis 可以轻松与 Spring 框架集成，简化配置和管理。
4、轻量级：
- MyBatis 是一个轻量级框架，核心库非常小，学习成本低。
5、支持多种数据库：
- MyBatis 支持多种数据库（如 MySQL、Oracle、PostgreSQL 等），具有良好的可移植性。
Spring Boot 整合原生的 mybatis
maven依赖
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0modelVersion>
<artifactId>spring-boot-demo-orm-mybatisartifactId>
<version>1.0.0-SNAPSHOTversion>
<packaging>jarpackaging>
<name>spring-boot-demo-orm-mybatisname>
<description>Demo project for Spring Bootdescription>
<parent>
<groupId>com.xiaomagroupId>
<artifactId>spring-boot-demoartifactId>
<version>1.0.0-SNAPSHOTversion>
parent>
<properties>
<project.build.sourceEncoding>UTF-8project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8project.reporting.outputEncoding>
<java.version>1.8java.version>
<mybatis.version>1.3.2mybatis.version>
properties>
<dependencies>
<dependency>
<groupId>org.mybatis.spring.bootgroupId>
<artifactId>mybatis-spring-boot-starterartifactId>
<version>${mybatis.version}version>
dependency>
<dependency>
<groupId>mysqlgroupId>
<artifactId>mysql-connector-javaartifactId>
dependency>
<dependency>
<groupId>org.projectlombokgroupId>
<artifactId>lombokartifactId>
<optional>trueoptional>
dependency>
<dependency>
<groupId>cn.hutoolgroupId>
<artifactId>hutool-allartifactId>
dependency>
<dependency>
<groupId>com.google.guavagroupId>
<artifactId>guavaartifactId>
dependency>
<dependency>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-starter-testartifactId>
<scope>testscope>
dependency>
dependencies>
<build>
<finalName>spring-boot-demo-orm-mybatisfinalName>
<plugins>
<plugin>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-maven-pluginartifactId>
plugin>
plugins>
build>
project>
SpringBootDemoOrmMybatisApplication.java
@MapperScan(basePackages = {"com.xiaoma.orm.mybatis.mapper"})
@SpringBootApplication
public class SpringBootDemoOrmMybatisApplication {
public static void main(String[] args) {
SpringApplication.run(SpringBootDemoOrmMybatisApplication.class, args);
}
}
application.yaml
spring:
datasource:
url: jdbc:mysql://127.0.0.1:3306/test?useUnicode=true&characterEncoding=UTF-8&useSSL=false&autoReconnect=true&failOverReadOnly=false&serverTimezone=GMT%2B8
username: root
password: root
driver-class-name: com.mysql.cj.jdbc.Driver
type: com.zaxxer.hikari.HikariDataSource
initialization-mode: always
continue-on-error: true
schema:
- "classpath:db/schema.sql"
data:
- "classpath:db/data.sql"
hikari:
minimum-idle: 5
connection-test-query: SELECT 1 FROM DUAL
maximum-pool-size: 20
auto-commit: true
idle-timeout: 30000
pool-name: SpringBootDemoHikariCP
max-lifetime: 60000
connection-timeout: 30000
logging:
level:
com.xiaoma: debug
com.xiaoma.orm.mybatis.mapper: trace
mybatis:
configuration:
# 下划线转驼峰
map-underscore-to-camel-case: true
mapper-locations: classpath:mappers/*.xml
type-aliases-package: com.xiaoma.orm.mybatis.entity
UserMapper.java
@Mapper
@Component
public interface UserMapper {
/**
* 查询所有用户
*
* @return 用户列表
*/
@Select("SELECT * FROM orm_user")
List<User> selectAllUser();
/**
* 根据id查询用户
*
* @param id 主键id
* @return 当前id的用户，不存在则是 {@code null}
*/
@Select("SELECT * FROM orm_user WHERE id = #{id}")
User selectUserById(@Param("id") Long id);
/**
* 保存用户
*
* @param user 用户
* @return 成功 - {@code 1} 失败 - {@code 0}
*/
int saveUser(@Param("user") User user);
/**
* 删除用户
*
* @param id 主键id
* @return 成功 - {@code 1} 失败 - {@code 0}
*/
int deleteById(@Param("id") Long id);
}
UserMapper.xml
DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.xiaoma.orm.mybatis.mapper.UserMapper">
<insert id="saveUser">
INSERT INTO `orm_user` (`name`,
`password`,
`salt`,
`email`,
`phone_number`,
`status`,
`create_time`,
`last_login_time`,
`last_update_time`)
VALUES (#{user.name},
#{user.password},
#{user.salt},
#{user.email},
#{user.phoneNumber},
#{user.status},
#{user.createTime},
#{user.lastLoginTime},
#{user.lastUpdateTime})
insert>
<delete id="deleteById">
DELETE
FROM `orm_user`
WHERE `id` = #{id}
delete>
mapper>
UserMapperTest.java
@Slf4j
public class UserMapperTest extends SpringBootDemoOrmMybatisApplicationTests {
@Autowired
private UserMapper userMapper;
@Test
public void selectAllUser() {
List<User> userList = userMapper.selectAllUser();
Assert.assertTrue(CollUtil.isNotEmpty(userList));
log.debug("【userList】= {}", userList);
}
@Test
public void selectUserById() {
User user = userMapper.selectUserById(1L);
Assert.assertNotNull(user);
log.debug("【user】= {}", user);
}
@Test
public void saveUser() {
String salt = IdUtil.fastSimpleUUID();
User user = User.builder().name("testSave3").password(SecureUtil.md5("123456" + salt)).salt(salt).email("[email protected]").phoneNumber("17300000003").status(1).lastLoginTime(new DateTime()).createTime(new DateTime()).lastUpdateTime(new DateTime()).build();
int i = userMapper.saveUser(user);
Assert.assertEquals(1, i);
}
@Test
public void deleteById() {
int i = userMapper.deleteById(1L);
Assert.assertEquals(1, i);
}
}