MyBatis-Plus通过version机制实现乐观锁的思路

@Configuration
public class MyBatisPlusConfig {

    /**
     * 插件配置
     *
     * @return
     */
    @Bean
    public MybatisPlusInterceptor mybatisPlusInterceptor() {
        MybatisPlusInterceptor interceptor = new MybatisPlusInterceptor();
        // 向MyBatis-Plus的过滤器链中添加分页拦截器，需要设置数据库类型（主要用于分页方言）
        interceptor.addInnerInterceptor(new PaginationInnerInterceptor(DbType.MYSQL));
        // 添加乐观锁拦截器
        interceptor.addInnerInterceptor(new OptimisticLockerInnerInterceptor());
        return interceptor;
    }
}

@Data
@TableName("tb_user")
public class UserEntity {
    private Long id;
    private String name;
    private Integer age;
    private String email;

    @TableField(value = "create_time", fill = FieldFill.INSERT)
    private Date createTime;

    @TableField(value = "update_time", fill = FieldFill.INSERT_UPDATE)
    private Date updateTime;

    @TableLogic(value = "0", delval = "-1")
    @TableField(value = "delete_flag", fill = FieldFill.INSERT)
    private Integer deleteFlag;

    @Version
    @TableField(value = "version", fill = FieldFill.INSERT)
    private Integer version;
}

/**
 * 自动填充字段值得配置
 */
@Component
public class AutoFillFieldValueConfig implements MetaObjectHandler {

    @Override
    public void insertFill(MetaObject metaObject) {
        this.strictInsertFill(metaObject, "createTime", Date.class, new Date());
        this.strictInsertFill(metaObject, "updateTime", Date.class, new Date());
        this.strictInsertFill(metaObject, "deleteFlag", Integer.class, 0);
        this.strictInsertFill(metaObject, "version", Integer.class, 1);
    }

    @Override
    public void updateFill(MetaObject metaObject) {
        this.strictUpdateFill(metaObject, "updateTime", Date.class, new Date());
    }
}

@Test
    public void testVersionInsert() {
        // 插入一个新的用户
        UserEntity newUser = new UserEntity();
        newUser.setId(12L);
        newUser.setName("Kelly");
        newUser.setAge(28);
        newUser.setEmail("Kelly@163.com");
        userMapper.insert(newUser);
    }

   @Test
    public void testVersionUpdate() {
        // 查询用户记录
        UserEntity updateUser = userMapper.selectById(12L);
        // 更新用户记录
        updateUser.setId(12L);
        updateUser.setAge(30);
        userMapper.updateById(updateUser);
    }