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README
Apache-2.0

DATABIND-无sql绑定关联信息我们是认真的

绑定方式

数据字典关联绑定

当表中的字段为数据字典类型的值时,可使用数据字典关联来绑定表字段与数据字典的关联关系。 通过@BindDict注解,数据字典关联时无需写大量java代码和SQL关联查询,即可快速转换值字典value值为label。

  • 使用@BindDict注解时需传两个参数,分别是type和field。

  • type表示关联的数据字典类型;

  • field表示关联字段。 示例如下:

    @BindDict(type="USER_STATUS", field = "status")
    private String statusLabel;

绑定从表Entity实体

绑定单个实体(或实体对应的VO)使用**@BindEntity**注解进行处理,将得到关联表对应的单个实体。

  • 使用@BindEntity注解时需指定两个参数:entity和condition。
    • entity 表示关联实体类;
    • condition 表示关联条件(当前对象表中的字段加“'this.'前缀或写在比较条件的左侧,被绑定Entity表的字段在右侧)。
    • deepBind 是否深度绑定,默认false。当绑定Entity对象为VO(类定义中还有Bind注解),开启deepBind=true,可以实现对被绑定VO的注解的再次绑定。
  • 主表1-1直接关联从表,获取从表Entity,注解示例如下:
@BindEntity(entity = Department.class, condition="this.department_id=id")
private Department department;
  • deepBind 深度绑定注解示例如下:
@BindEntity(entity = Department.class, condition="this.department_id=id", deepBind=true)
private DepartmentVO departmentVO;

绑定从表Entity实体列表

绑定实体(或实体对应的VO)列表使用**@BindEntityList**注解进行处理,将得到关联表对应的实体列表。

  • @BindEntityList多数注解参数与@BindEntity相同。
    • 新增参数: orderBy 对绑定结果集合的排序标识,用法同列表页查询的orderBy排序,具体格式为'列名:排序方式,列名:排序方式',示例如下:
      • orderBy="sort_id" //按sort_id升序(默认)
      • orderBy="sort_id:ASC" //按sort_id升序
      • orderBy="sort_id:DESC" //按sort_id降序
      • orderBy="type:ASC,id:DESC" //先按type升序,type相同按id降序
  • 主表1-n直接关联从表,获取从表的Entity列表,注解示例如下:
// 关联其他表
@BindEntityList(entity = Department.class, condition="department_id=id")
private List<Department> departmentList;

// 关联自身,实现加载子级
@BindEntityList(entity = Department.class, condition ="id=parent_id")
private List<Department> children;
 

绑定从表字段

绑定字段使用**@BindField**注解进行处理,将得到关联表的目标字段的值(集合)。

  • @BindField 或 @BindFieldList 注解需三个参数,分别是entity、field、condition。
    • entity表示关联实体;
    • field表示关联表字段名;
    • condition表示关联条件,用法同BindEntity*。
  • 主表1-1直接关联从表,获取从表字段值,注解示例如下:
@BindField(entity=Department.class, field="name", condition="department_id=id AND parent_id>=0")
private String deptName;
 

绑定调用方式

  1. 通过在VO类中添加相关字段,以及对应的关联绑定注解,来定义我们的绑定类型和需要得到的结果以及额外的条件等信息;
  2. 注解添加后,调用Binder类中的相关方法(*bindRelations)执行这个绑定关系,目前提供了两种方式适配不同场景:

自动绑定关联

该关联会自动将相关信息查询并设置到voList中,适用于对已有的voList做处理,如:

//List<MyUserVO> voList = ...; 
Binder.bindRelations(voList);

自动转型并绑定关联

该关联会自动将vo所继承的父类的实体列表进行绑定并自动转型为voList,适用于对于非voList的实体列表等做处理,如:

// 查询单表获取Entity集合
// List<User> entityList = userService.list(queryWrapper);
// 转型并绑定关联
List<MyUserVO> voList = Binder.convertAndBindRelations(userList, MyUserVO.class);

通过BaseService接口实现绑定

// 绑定单个VO对象
service.getViewObject()
// 绑定多个VO集合
service.getViewObjectList()

使用依赖

<dependency>
    <groupId>com.heaboy</groupId>
    <artifactId>databind</artifactId>
    <version>1.0.0</version>
    <exclusions>
        <!--如果使用spring boot 需要把面的依赖排除掉 -->
        <exclusion>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-log4j12</artifactId>
        </exclusion>
    </exclusions>
</dependency>

从diboot-core 精简出来的仅供单个数据绑定的小工具,不支持中间表联查,涉及到join还是建议自行写sql而不是通过工具 本项目依赖mybatis-plus从diboot项目中精简得出,如果你是spring项目可以将spring的依赖排除掉

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