上一篇博文介绍了SpringBoot整合mybatis的过程,但是xml的方式,总感觉让人有点蛋疼;本文将介绍一种noxml的使用姿势,纯用注解的方式来支持CURD
本文使用SpringBoot版本为 2.2.1.RELEASE
, mybatis版本为 1.3.2
,数据库为mysql 5+
推荐是用官方的教程来创建一个SpringBoot项目; 如果直接创建一个maven工程的话,将下面配置内容,拷贝到你的 pom.xml
中
mybatis-spring-boot-starter
,可以减少令人窒息的配置 <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.2.1.RELEASE</version> <relativePath/> <!-- lookup parent from repository --> </parent> <properties> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding> <java.version>1.8</java.version> </properties> <dependencies> <dependency> <groupId>org.mybatis.spring.boot</groupId> <artifactId>mybatis-spring-boot-starter</artifactId> <version>1.3.2</version> </dependency> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> </dependency> </dependencies> <build> <pluginManagement> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </pluginManagement> </build> <repositories> <repository> <id>spring-snapshots</id> <name>Spring Snapshots</name> <url>https://repo.spring.io/libs-snapshot-local</url> <snapshots> <enabled>true</enabled> </snapshots> </repository> <repository> <id>spring-milestones</id> <name>Spring Milestones</name> <url>https://repo.spring.io/libs-milestone-local</url> <snapshots> <enabled>false</enabled> </snapshots> </repository> <repository> <id>spring-releases</id> <name>Spring Releases</name> <url>https://repo.spring.io/libs-release-local</url> <snapshots> <enabled>false</enabled> </snapshots> </repository> </repositories>
在 application.yml
配置文件中,加一下db的相关配置
spring: datasource: url: jdbc:mysql://127.0.0.1:3306/story?useUnicode=true&characterEncoding=UTF-8&useSSL=false username: root password:
接下来准备一个测试表(依然借用之前db操作系列博文中的表结构),用于后续的CURD;表结果信息如下
DROP TABLE IF EXISTS `money`; CREATE TABLE `money` ( `id` int(11) unsigned NOT NULL AUTO_INCREMENT, `name` varchar(20) NOT NULL DEFAULT '' COMMENT '用户名', `money` int(26) NOT NULL DEFAULT '0' COMMENT '有多少钱', `is_deleted` tinyint(1) NOT NULL DEFAULT '0', `create_at` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT '创建时间', `update_at` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP COMMENT '更新时间', PRIMARY KEY (`id`), KEY `name` (`name`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
在前一篇的基础上进行扩展,重点在于干掉了xml文件,在DAO接口上通过注解来实现CURD
创建表对应的PO对象: MoneyPo
@Data public class MoneyPo { private Integer id; private String name; private Long money; private Integer isDeleted; private Timestamp createAt; private Timestamp updateAt; }
表的操作接口,下面简单的写了四个接口,分别对应CRUID四种操作
@Mapper public interface MoneyMapper { // 支持主键写回到po @Options(useGeneratedKeys = true, keyProperty = "po.id", keyColumn = "id") @Insert("insert into money (name, money, is_deleted) values (#{po.name}, #{po.money}, #{po.isDeleted})") int savePo(@Param("po") MoneyPo po); @Select("select * from money where name=#{name}") @Results({@Result(property = "id", column = "id", id = true, jdbcType = JdbcType.INTEGER), @Result(property = "name", column = "name", jdbcType = JdbcType.VARCHAR), @Result(property = "money", column = "money", jdbcType = JdbcType.INTEGER), @Result(property = "isDeleted", column = "is_deleted", jdbcType = JdbcType.TINYINT), @Result(property = "createAt", column = "create_at", jdbcType = JdbcType.TIMESTAMP), @Result(property = "updateAt", column = "update_at", jdbcType = JdbcType.TIMESTAMP)}) List<MoneyPo> findByName(@Param("name") String name); @Update("update money set money=money+#{money} where id=#{id}") int addMoney(@Param("id") int id, @Param("money") int money); @Delete("delete from money where id = #{id,jdbcType=INTEGER}") int delPo(@Param("id") int id); @Select("<script> select * from money " + "<trim prefix=/"WHERE/" prefixOverrides=/"AND | OR/">" + " <if test=/"id != null/">" + " id = #{id}" + " </if>" + " <if test=/"name != null/">" + " AND name=#{name}" + " </if>" + " <if test=/"money != null/">" + " AND money=#{money}" + " </if>" + "</trim>" + "</script>") @Results({@Result(property = "id", column = "id", id = true, jdbcType = JdbcType.INTEGER), @Result(property = "name", column = "name", jdbcType = JdbcType.VARCHAR), @Result(property = "money", column = "money", jdbcType = JdbcType.INTEGER), @Result(property = "isDeleted", column = "is_deleted", jdbcType = JdbcType.TINYINT), @Result(property = "createAt", column = "create_at", jdbcType = JdbcType.TIMESTAMP), @Result(property = "updateAt", column = "update_at", jdbcType = JdbcType.TIMESTAMP)}) List<MoneyPo> findByPo(MoneyPo po); }
从mapper的实现上,也可以看出来,通过 @Insert
, @Select
, @Update
, @Delete
四个注解来实现CURD,使用上面这种方式时,有几个点需要注意
@Options(useGeneratedKeys = true, keyProperty = "po.id", keyColumn = "id") <script> <resultMap>
接下来简单测试一下上面的四个接口,看是否可以正常工作
启动类
@SpringBootApplication public class Application { public Application(MoneyRepository repository) { repository.testMapper(); } public static void main(String[] args) { SpringApplication.run(Application.class, args); } }
测试类
@Repository public class MoneyRepository { @Autowired private MoneyMapper moneyMapper; private Random random = new Random(); public void testMapper() { MoneyPo po = new MoneyPo(); po.setName("mybatis noxml user"); po.setMoney((long) random.nextInt(12343)); po.setIsDeleted(0); moneyMapper.savePo(po); System.out.println("add record: " + po); moneyMapper.addMoney(po.getId(), 200); System.out.println("after update: " + moneyMapper.findByName(po.getName())); moneyMapper.delPo(po.getId()); System.out.println("after delete: " + moneyMapper.findByName(po.getName())); } }
输出结果
尽信书则不如,以上内容,纯属一家之言,因个人能力有限,难免有疏漏和错误之处,如发现bug或者有更好的建议,欢迎批评指正,不吝感激
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