com.github.yulichang.wrapper.interfaces

接口 Query<Children>

所有超级接口:

Serializable

所有已知实现类:

MPJLambdaWrapper

public interface Query<Children>
extends Serializable

参考 Query

作者:

yulichang

方法概要

限定符和类型	方法和说明
String	getAlias()
Children	getChildren()
Integer	getIndex()
List<Select>	getSelectColum()
String	getSqlSelect() select sql 片段
boolean	isHasAlias()
default <E> Children	select(Class<E> entityClass, java.util.function.Predicate<com.baomidou.mybatisplus.core.metadata.TableFieldInfo> predicate) 已过时。
<E> Children	select(com.baomidou.mybatisplus.core.toolkit.support.SFunction<E,?>... columns)
default Children	select(String... columns) String 查询
default Children	selectAll(Class<?> clazz) 查询实体类全部字段
default Children	selectAll(Class<?> clazz, String prefix) 查询实体类全部字段
default <S,X> Children	selectAs(com.baomidou.mybatisplus.core.toolkit.support.SFunction<S,?> column, com.baomidou.mybatisplus.core.toolkit.support.SFunction<X,?> alias) ignore
default <S> Children	selectAs(com.baomidou.mybatisplus.core.toolkit.support.SFunction<S,?> column, String alias) 别名查询
default <E> Children	selectAs(String column, com.baomidou.mybatisplus.core.toolkit.support.SFunction<E,?> alias) String 查询
default <E,X> Children	selectAs(String index, com.baomidou.mybatisplus.core.toolkit.support.SFunction<E,?> column, com.baomidou.mybatisplus.core.toolkit.support.SFunction<X,?> alias) String 查询
default <E> Children	selectAsClass(Class<E> source, Class<?> tag) 说明： 比如我们需要查询用户表有10个字段，然而我们只需要3个就够了，用mybatis-plus提供的select 需要一个属性一个属性填入很不优雅，现在我们可以用selectAsClass(UserDO.class, UserVo.class) 即可按所需的UserVo返回，前提是UserVo.class中的属性必须是UserDO.class中存在的
default <S> Children	selectAvg(com.baomidou.mybatisplus.core.toolkit.support.SFunction<S,?> column) MIN()
default <S,X> Children	selectAvg(com.baomidou.mybatisplus.core.toolkit.support.SFunction<S,?> column, com.baomidou.mybatisplus.core.toolkit.support.SFunction<X,?> alias)
default <S,X> Children	selectAvg(com.baomidou.mybatisplus.core.toolkit.support.SFunction<S,?> column, String alias)
default <X> Children	selectCount(Object column, com.baomidou.mybatisplus.core.toolkit.support.SFunction<X,?> alias)
default Children	selectCount(Object column, String alias)
default <S> Children	selectCount(com.baomidou.mybatisplus.core.toolkit.support.SFunction<S,?> column) COUNT()
default <S,X> Children	selectCount(com.baomidou.mybatisplus.core.toolkit.support.SFunction<S,?> column, com.baomidou.mybatisplus.core.toolkit.support.SFunction<X,?> alias)
default <S,X> Children	selectCount(com.baomidou.mybatisplus.core.toolkit.support.SFunction<S,?> column, String alias)
default <E> Children	selectFilter(Class<E> entityClass, java.util.function.Predicate<SelectCache> predicate) 过滤查询的字段信息 例1: 只要 java 字段名以 "test" 开头的 -> select(i -> i.getProperty().startsWith("test")) 例2: 只要 java 字段属性是 CharSequence 类型的 -> select(TableFieldInfo::isCharSequence) 例3: 只要 java 字段没有填充策略的 -> select(i -> i.getFieldFill() == FieldFill.DEFAULT) 例4: 要全部字段 -> select(i -> true) 例5: 只要主键字段 -> select(i -> false)
default <X> Children	selectFunc(BaseFuncEnum funcEnum, Object column, com.baomidou.mybatisplus.core.toolkit.support.SFunction<X,?> alias)
default Children	selectFunc(BaseFuncEnum funcEnum, Object column, String alias) 聚合函数查询 wrapper.selectFunc(() -> "COUNT(%s)", "t.id", "total"); lambda wrapper.selectFunc(() -> "COUNT(%s)", UserDO::getId, UserDTO::getTotal);
default <S> Children	selectFunc(BaseFuncEnum funcEnum, com.baomidou.mybatisplus.core.toolkit.support.SFunction<S,?> column)
default <S,X> Children	selectFunc(BaseFuncEnum funcEnum, com.baomidou.mybatisplus.core.toolkit.support.SFunction<S,?> column, com.baomidou.mybatisplus.core.toolkit.support.SFunction<X,?> alias)
default <S> Children	selectFunc(BaseFuncEnum funcEnum, com.baomidou.mybatisplus.core.toolkit.support.SFunction<S,?> column, String alias)
default <X,S> Children	selectFunc(String sql, java.util.function.Function<SelectFunc.Func,com.baomidou.mybatisplus.core.toolkit.support.SFunction<?,?>[]> column, com.baomidou.mybatisplus.core.toolkit.support.SFunction<S,?> alias)
default <X> Children	selectFunc(String sql, java.util.function.Function<SelectFunc.Func,com.baomidou.mybatisplus.core.toolkit.support.SFunction<?,?>[]> column, String alias)
default <S> Children	selectLen(com.baomidou.mybatisplus.core.toolkit.support.SFunction<S,?> column) LEN()
default <S,X> Children	selectLen(com.baomidou.mybatisplus.core.toolkit.support.SFunction<S,?> column, com.baomidou.mybatisplus.core.toolkit.support.SFunction<X,?> alias)
default <S,X> Children	selectLen(com.baomidou.mybatisplus.core.toolkit.support.SFunction<S,?> column, String alias)
default <S> Children	selectMax(com.baomidou.mybatisplus.core.toolkit.support.SFunction<S,?> column) MAX()
default <S,X> Children	selectMax(com.baomidou.mybatisplus.core.toolkit.support.SFunction<S,?> column, com.baomidou.mybatisplus.core.toolkit.support.SFunction<X,?> alias)
default <S,X> Children	selectMax(com.baomidou.mybatisplus.core.toolkit.support.SFunction<S,?> column, String alias)
default <S> Children	selectMin(com.baomidou.mybatisplus.core.toolkit.support.SFunction<S,?> column) MIN()
default <S,X> Children	selectMin(com.baomidou.mybatisplus.core.toolkit.support.SFunction<S,?> column, com.baomidou.mybatisplus.core.toolkit.support.SFunction<X,?> alias)
default <S,X> Children	selectMin(com.baomidou.mybatisplus.core.toolkit.support.SFunction<S,?> column, String alias)
default <S> Children	selectSum(com.baomidou.mybatisplus.core.toolkit.support.SFunction<S,?> column) SUM()
default <S,X> Children	selectSum(com.baomidou.mybatisplus.core.toolkit.support.SFunction<S,?> column, com.baomidou.mybatisplus.core.toolkit.support.SFunction<X,?> alias)
default <S,X> Children	selectSum(com.baomidou.mybatisplus.core.toolkit.support.SFunction<S,?> column, String alias)

方法详细资料

getSelectColum

List<Select> getSelectColum()

getChildren

Children getChildren()

getIndex

Integer getIndex()

isHasAlias

boolean isHasAlias()

getAlias

String getAlias()

select

@Deprecated
default <E> Children select(Class<E> entityClass,
                                         java.util.function.Predicate<com.baomidou.mybatisplus.core.metadata.TableFieldInfo> predicate)

已过时。

过滤查询的字段信息(主键除外!) 推荐使用 selectFilter(Class, Predicate) 含主键

参数:

predicate - 过滤方式

返回:

children

另请参阅:

selectFilter(Class, Predicate)

selectFilter

default <E> Children selectFilter(Class<E> entityClass,
                                  java.util.function.Predicate<SelectCache> predicate)

过滤查询的字段信息

例1: 只要 java 字段名以 "test" 开头的 -> select(i -> i.getProperty().startsWith("test"))

例2: 只要 java 字段属性是 CharSequence 类型的 -> select(TableFieldInfo::isCharSequence)

例3: 只要 java 字段没有填充策略的 -> select(i -> i.getFieldFill() == FieldFill.DEFAULT)

例4: 要全部字段 -> select(i -> true)

例5: 只要主键字段 -> select(i -> false)

参数:

predicate - 过滤方式

返回:

children

select

<E> Children select(com.baomidou.mybatisplus.core.toolkit.support.SFunction<E,?>... columns)

select

default Children select(String... columns)

String 查询

参数:

columns - 列

selectAs

default <E> Children selectAs(String column,
                              com.baomidou.mybatisplus.core.toolkit.support.SFunction<E,?> alias)

String 查询

参数:

column - 列

selectAs

default <E,X> Children selectAs(String index,
                                com.baomidou.mybatisplus.core.toolkit.support.SFunction<E,?> column,
                                com.baomidou.mybatisplus.core.toolkit.support.SFunction<X,?> alias)

String 查询

参数:

column - 列

selectAsClass

default <E> Children selectAsClass(Class<E> source,
                                   Class<?> tag)

说明： 比如我们需要查询用户表有10个字段，然而我们只需要3个就够了，用mybatis-plus提供的select

需要一个属性一个属性填入很不优雅，现在我们可以用selectAsClass(UserDO.class, UserVo.class)

即可按所需的UserVo返回，前提是UserVo.class中的属性必须是UserDO.class中存在的

参数:

source - 数据源实体类

tag - 目标类

返回:

children

selectAs

default <S,X> Children selectAs(com.baomidou.mybatisplus.core.toolkit.support.SFunction<S,?> column,
                                com.baomidou.mybatisplus.core.toolkit.support.SFunction<X,?> alias)

ignore

selectAs

default <S> Children selectAs(com.baomidou.mybatisplus.core.toolkit.support.SFunction<S,?> column,
                              String alias)

别名查询

selectAll

default Children selectAll(Class<?> clazz)

查询实体类全部字段

selectAll

default Children selectAll(Class<?> clazz,
                           String prefix)

查询实体类全部字段

getSqlSelect

String getSqlSelect()

select sql 片段

selectFunc

default Children selectFunc(BaseFuncEnum funcEnum,
                            Object column,
                            String alias)

聚合函数查询

wrapper.selectFunc(() -> "COUNT(%s)", "t.id", "total");

lambda wrapper.selectFunc(() -> "COUNT(%s)", UserDO::getId, UserDTO::getTotal);

参数:

funcEnum - 函数枚举 DefaultFuncEnum

column - 函数作用的字段

alias - 别名

selectFunc

default <S> Children selectFunc(BaseFuncEnum funcEnum,
                                com.baomidou.mybatisplus.core.toolkit.support.SFunction<S,?> column,
                                String alias)

selectFunc

default <S,X> Children selectFunc(BaseFuncEnum funcEnum,
                                  com.baomidou.mybatisplus.core.toolkit.support.SFunction<S,?> column,
                                  com.baomidou.mybatisplus.core.toolkit.support.SFunction<X,?> alias)

selectFunc

default <S> Children selectFunc(BaseFuncEnum funcEnum,
                                com.baomidou.mybatisplus.core.toolkit.support.SFunction<S,?> column)

selectFunc

default <X> Children selectFunc(BaseFuncEnum funcEnum,
                                Object column,
                                com.baomidou.mybatisplus.core.toolkit.support.SFunction<X,?> alias)

selectFunc

default <X> Children selectFunc(String sql,
                                java.util.function.Function<SelectFunc.Func,com.baomidou.mybatisplus.core.toolkit.support.SFunction<?,?>[]> column,
                                String alias)

selectFunc

default <X,S> Children selectFunc(String sql,
                                  java.util.function.Function<SelectFunc.Func,com.baomidou.mybatisplus.core.toolkit.support.SFunction<?,?>[]> column,
                                  com.baomidou.mybatisplus.core.toolkit.support.SFunction<S,?> alias)

selectSum

default <S> Children selectSum(com.baomidou.mybatisplus.core.toolkit.support.SFunction<S,?> column)

SUM()

selectSum

default <S,X> Children selectSum(com.baomidou.mybatisplus.core.toolkit.support.SFunction<S,?> column,
                                 com.baomidou.mybatisplus.core.toolkit.support.SFunction<X,?> alias)

selectSum

default <S,X> Children selectSum(com.baomidou.mybatisplus.core.toolkit.support.SFunction<S,?> column,
                                 String alias)

selectCount

default <S> Children selectCount(com.baomidou.mybatisplus.core.toolkit.support.SFunction<S,?> column)

COUNT()

selectCount

default <X> Children selectCount(Object column,
                                 com.baomidou.mybatisplus.core.toolkit.support.SFunction<X,?> alias)

selectCount

default Children selectCount(Object column,
                             String alias)

selectCount

default <S,X> Children selectCount(com.baomidou.mybatisplus.core.toolkit.support.SFunction<S,?> column,
                                   com.baomidou.mybatisplus.core.toolkit.support.SFunction<X,?> alias)

selectCount

default <S,X> Children selectCount(com.baomidou.mybatisplus.core.toolkit.support.SFunction<S,?> column,
                                   String alias)

selectMax

default <S> Children selectMax(com.baomidou.mybatisplus.core.toolkit.support.SFunction<S,?> column)

MAX()

selectMax

default <S,X> Children selectMax(com.baomidou.mybatisplus.core.toolkit.support.SFunction<S,?> column,
                                 com.baomidou.mybatisplus.core.toolkit.support.SFunction<X,?> alias)

selectMax

default <S,X> Children selectMax(com.baomidou.mybatisplus.core.toolkit.support.SFunction<S,?> column,
                                 String alias)

selectMin

default <S> Children selectMin(com.baomidou.mybatisplus.core.toolkit.support.SFunction<S,?> column)

MIN()

selectMin

default <S,X> Children selectMin(com.baomidou.mybatisplus.core.toolkit.support.SFunction<S,?> column,
                                 com.baomidou.mybatisplus.core.toolkit.support.SFunction<X,?> alias)

selectMin

default <S,X> Children selectMin(com.baomidou.mybatisplus.core.toolkit.support.SFunction<S,?> column,
                                 String alias)

selectAvg

default <S> Children selectAvg(com.baomidou.mybatisplus.core.toolkit.support.SFunction<S,?> column)

MIN()

selectAvg

default <S,X> Children selectAvg(com.baomidou.mybatisplus.core.toolkit.support.SFunction<S,?> column,
                                 com.baomidou.mybatisplus.core.toolkit.support.SFunction<X,?> alias)

selectAvg

default <S,X> Children selectAvg(com.baomidou.mybatisplus.core.toolkit.support.SFunction<S,?> column,
                                 String alias)

selectLen

default <S> Children selectLen(com.baomidou.mybatisplus.core.toolkit.support.SFunction<S,?> column)

LEN()

selectLen

default <S,X> Children selectLen(com.baomidou.mybatisplus.core.toolkit.support.SFunction<S,?> column,
                                 com.baomidou.mybatisplus.core.toolkit.support.SFunction<X,?> alias)

selectLen

default <S,X> Children selectLen(com.baomidou.mybatisplus.core.toolkit.support.SFunction<S,?> column,
                                 String alias)