springboot整合mybatis与动态查询

1、配置application.properties

server.servlet.context-path=/hysightdashboard
server.port=4003

#mysql数据库连接信息
spring.datasource.url=jdbc:mysql://ip:port/database?useUnicode=true&characterEncoding=UTF-8
spring.datasource.username=root
spring.datasource.password=123456
spring.datasource.driver-class-name=com.mysql.jdbc.Driver

mybatis.type-aliases-package=com.entity
mybatis.mapper-locations=classpath*:mappers/*.xml
mybatis.config-location=classpath:mybatis/mybatis-config.xml

mapper.xml

<!--动态查询的语句 --> 
<select id="getAllDashboards" parameterType="com.hiynn.hysight.dashboard.entity.Dashboard" resultMap="dashboard">
        SELECT
        <include refid="baseColumns"/>
        FROM t_dashboard
        WHERE delete_flag='0'
        <if test="userId!= null">
            AND user_id=#{userId}
        </if>
        <if test="_parameter !=null">
            AND is_shared=#{isShared}
        </if>
        <if test="dashboardName!= null">
            AND dashboard_name LIKE CONCAT(CONCAT('%', #{dashboardName}), '%')
        </if>
        ORDER BY update_time DESC , create_time DESC
    </select>

mapper.java

Dashboard getDashboardById(String dashboardId);

service.java

public List<Dashboard> getAllDashboards(Dashboard dashboard) {

//        String userid=HysightThreadContext.getUser().getUserId();
        dashboard.setUserId("123");
        dashboard.setShared(false);

        return dashboardMapper.getAllDashboards(dashboard);
    }

controller

    @PostMapping("/getAll")
    public Result getAllDashboards(@RequestParam(value="page",defaultValue="1") int currentPage,
                                   @RequestParam(value="pagesize",defaultValue="10") int pageSize,
                                   @RequestBody Dashboard dashboard){
        PageHelper.startPage(currentPage, pageSize);
        PageInfo<Dashboard> pageInfo=new PageInfo<>(dashboardService.getAllDashboards(dashboard));
        return Result.build().success("获取Dashboards成功",pageInfo);
    }

测试结果如图：

需要注意几个小问题

传入参数是对象时，需要使用@ResquestBody注解，可以将对象转化为json字符串，不然谁知道你传进来的啥，怎么解析
mybatis中的映射<resultType>只能在返回结果中使用如：reultType="dashboard"
有个参数的问题一直报错，报错原因是找不到该参数的get方法，将该参数的非空判断改为_parameter ！=null就好了，具体原因未知
动态查询有一个很别扭的问题就是我要查询的是Dashboard的集合，然而却让我使用dashboard作为参数，刚开始还在想是不是有问题，但是再写一个包装类挺麻烦，后来发现其实没什么问题，输入的条件只是属于dashboard而已，当然可能封装起来更好，便于扩展。

springboot整合mybatis与动态查询

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