com.github.yulichang.wrapper.interfaces

接口 QueryLabel<Children>

所有已知实现类:

MPJLambdaWrapper

public interface QueryLabel<Children>

对一或对多查询

从以下版本开始:

1.3.0

作者:

yulichang

方法概要

限定符和类型	方法和说明
void	addLabel(Label<?> label)
Children	getChildren()
default <S,C,F> Children	selectAssociation(Class<C> child, com.baomidou.mybatisplus.core.toolkit.support.SFunction<S,F> dtoField) 对一查询 用法参考 selectCollection
default <S,C,F> Children	selectAssociation(Class<C> child, com.baomidou.mybatisplus.core.toolkit.support.SFunction<S,F> dtoField, MFunc<MybatisLabel.Builder<C,F>> collection) 对一查询 用法参考 selectCollection
default <S,C,F> Children	selectAssociation(com.baomidou.mybatisplus.core.toolkit.support.SFunction<S,F> dtoField, MFunc<MybatisLabelFree.Builder<F>> collection)
default <S,C,F> Children	selectAssociation(String prefix, Class<C> child, com.baomidou.mybatisplus.core.toolkit.support.SFunction<S,F> dtoField)
default <S,C,F> Children	selectAssociation(String prefix, Class<C> child, com.baomidou.mybatisplus.core.toolkit.support.SFunction<S,F> dtoField, MFunc<MybatisLabel.Builder<C,F>> collection)
default <S,C,Z,F extends Collection<?>> Children	selectCollection(Class<C> child, com.baomidou.mybatisplus.core.toolkit.support.SFunction<S,F> dtoField) 一对多查询 调用此方法发必需要调用对应的 left join / right join ...
default <S,C,Z,F extends Collection<Z>> Children	selectCollection(Class<C> child, com.baomidou.mybatisplus.core.toolkit.support.SFunction<S,F> dtoField, MFunc<MybatisLabel.Builder<C,Z>> collection) 一对多查询 调用此方法发必需要调用对应的 left join / right join ...
default <S,Z,F extends Collection<Z>> Children	selectCollection(com.baomidou.mybatisplus.core.toolkit.support.SFunction<S,F> dtoField, MFunc<MybatisLabelFree.Builder<Z>> collection)
default <S,C,Z,F extends Collection<?>> Children	selectCollection(String prefix, Class<C> child, com.baomidou.mybatisplus.core.toolkit.support.SFunction<S,F> dtoField)
default <S,C,Z,F extends Collection<Z>> Children	selectCollection(String prefix, Class<C> child, com.baomidou.mybatisplus.core.toolkit.support.SFunction<S,F> dtoField, MFunc<MybatisLabel.Builder<C,Z>> collection)

方法详细资料

addLabel

void addLabel(Label<?> label)

getChildren

Children getChildren()

selectCollection

default <S,C,Z,F extends Collection<?>> Children selectCollection(Class<C> child,
                                                                  com.baomidou.mybatisplus.core.toolkit.support.SFunction<S,F> dtoField)

一对多查询 调用此方法发必需要调用对应的 left join / right join ... 连表方法，否则会报错

举例 UserDO AddressDO 为一对多关系 UserDTO 为结果类

     MPJLambdaQueryWrapper wrapper = new MPJLambdaQueryWrapper();
     wrapper.selectAll(UserDO.class)
            .selectCollection(AddressDO.class, UserDTO::getAddressListDTO)
            .leftJoin(AddressDO.class, ...... )
            .eq(...)
            ...
 
 会自动将 AddressDO类中相同属性的字段 以mybatis的方式映射到UserDTO.addressListDTO属性中

类型参数:

S - 包装类

C - 对多数据库实体类

Z - 包装类集合泛型

F - 包装类集合字段泛型

参数:

child - 连表数据库实体类

dtoField - 包装类对应的属性

从以下版本开始:

1.3.0

selectCollection

default <S,C,Z,F extends Collection<?>> Children selectCollection(String prefix,
                                                                  Class<C> child,
                                                                  com.baomidou.mybatisplus.core.toolkit.support.SFunction<S,F> dtoField)

selectCollection

default <S,C,Z,F extends Collection<Z>> Children selectCollection(Class<C> child,
                                                                  com.baomidou.mybatisplus.core.toolkit.support.SFunction<S,F> dtoField,
                                                                  MFunc<MybatisLabel.Builder<C,Z>> collection)

一对多查询 调用此方法发必需要调用对应的 left join / right join ... 连表方法，否则会报错

举例 UserDO AddressDO 为一对多关系 UserDTO 为结果类

   MPJLambdaQueryWrapper wrapper = new MPJLambdaQueryWrapper();
   wrapper.selectAll(UserDO.class)
      .selectCollection(AddressDO.class, UserDTO::getAddressListDTO, map -> map
           .id(AddressDO::getId, AddressDTO::getId)                 //如果属性名一致 可以传一个
           .result(AddressDO::getUserId)                            //如果属性名一致 可以传一个
           .result(AddressDO::getAddress, AddressDTO::getAddress))) //如果属性名一致 可以传一个
      .leftJoin(AddressDO.class, ...... )
      .eq(...)
      ...
 

 会自动将 AddressDO类中指定的字段 以mybatis的方式映射到UserDTO.addressListDTO属性中

类型参数:

S - 包装类

C - 对多数据库实体类

Z - 包装类集合泛型

F - 包装类集合字段泛型

参数:

child - 连表数据库实体类

dtoField - 包装类对应的属性

collection - collection标签内容

从以下版本开始:

1.3.0

selectCollection

default <S,Z,F extends Collection<Z>> Children selectCollection(com.baomidou.mybatisplus.core.toolkit.support.SFunction<S,F> dtoField,
                                                                MFunc<MybatisLabelFree.Builder<Z>> collection)

selectCollection

default <S,C,Z,F extends Collection<Z>> Children selectCollection(String prefix,
                                                                  Class<C> child,
                                                                  com.baomidou.mybatisplus.core.toolkit.support.SFunction<S,F> dtoField,
                                                                  MFunc<MybatisLabel.Builder<C,Z>> collection)

selectAssociation

default <S,C,F> Children selectAssociation(Class<C> child,
                                           com.baomidou.mybatisplus.core.toolkit.support.SFunction<S,F> dtoField)

对一查询 用法参考 selectCollection

从以下版本开始:

1.3.0

selectAssociation

default <S,C,F> Children selectAssociation(String prefix,
                                           Class<C> child,
                                           com.baomidou.mybatisplus.core.toolkit.support.SFunction<S,F> dtoField)

selectAssociation

default <S,C,F> Children selectAssociation(Class<C> child,
                                           com.baomidou.mybatisplus.core.toolkit.support.SFunction<S,F> dtoField,
                                           MFunc<MybatisLabel.Builder<C,F>> collection)

对一查询 用法参考 selectCollection

从以下版本开始:

1.3.0

selectAssociation

default <S,C,F> Children selectAssociation(com.baomidou.mybatisplus.core.toolkit.support.SFunction<S,F> dtoField,
                                           MFunc<MybatisLabelFree.Builder<F>> collection)

selectAssociation

default <S,C,F> Children selectAssociation(String prefix,
                                           Class<C> child,
                                           com.baomidou.mybatisplus.core.toolkit.support.SFunction<S,F> dtoField,
                                           MFunc<MybatisLabel.Builder<C,F>> collection)