QueryWrapper中常用方法，用法大全

AbstractWrapper 下的方法及使用

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方法名	说明	使用
allEq(Map params)	全部 =(或个别 isNull)	allEq(params,true)
eq	=	eq(“real_name”,“王昭君”)
ne	<>	ne(“nick_name”,“空想 4”)
gt	>	gt(“age”,21)
ge	>=	ge(“age”,22)
lt	<	lt(“age”,22)
le	<=	le(“age”,21")
between	cloum between ? and ?	between(“age”,21)
notBetween	cloum between ? and ?	notBetween(“age”,21)
like	cloum like ‘% 王 %’	like(“real_name”,“王”)
notLike	not like ‘% 王 %’	notLike(“real_name”,“王”)
likeLeft	like ‘% 王’	likeLeft(“real_name”,“昭”)
likeRight	like ‘王 %’	likeRight(“real_name”,“昭”)
isNull	is null	isNull(“gender”)
isNotNull	is not null	isNotNull(“gender”)
in	in (1,2,3)	in(“nick_name”,lists)
notin	age not in (1,3)	notin(“nick_name”,lists)
insql	age in (1,3,4,5,6)	insql(“nick_name”,"‘空想 4’,‘空想 5’,‘空想 6’")
notinsql	age not in (1,6)	notinsql(“nick_name”,‘空想 6’")
groupBy	group by id,name	groupBy(“nick_name”,“age”)
orderByAsc	order by id ASC,name ASC	orderByAsc(“nick_name”,“age”)
orderByDesc	order by id DESC,name DESC	orderByDesc(“age”)
orderBy	order by id ASC,name ASC	orderBy(true,true,“age”)
having	having sum(age) > 10	having(“sum(age) > 10”)
or	id = 1 or name = ‘老王’	eq(“nick_name”,“空想 4”).or(i->i.eq(“age”,21) eq(“nick_name”,“空想 4”).or().eq(“nick_name”,“空想 5”)
and	and (name = ‘李白’ and status <> ‘活着’)	and(i->i.eq(“age”,21))
nested	(name = ‘李白’ and status <> ‘活着’)	nested(i->i.eq(“age”,21).eq(“nick_name”,“空想 4”))
apply	id = 1	apply(“nick_name = ‘空想 4’”)
last	最后添加多个以最后的为准，有 sql 注入风险	last(“limit 1”)
exists	拼接 EXISTS (sql 语句)	exists(“select id from table where age = 1”)
notExists	拼接 NOT EXISTS (sql 语句)	notExists(“select id from table where age = 1”)

QueryWrapper

继承自 AbstractWrapper,自身的内部属性 entity 也用于生成 where 条件
及 LambdaQueryWrapper,可以通过 new QueryWrapper().lambda() 方法获取

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方法名	说明	使用
select	select(i -> i.getproperty().startsWith(“test”))	select(“id”,“name”,“age”)

UpdateWrapper

继承自 AbstractWrapper,自身的内部属性 entity 也用于生成 where 条件
及 LambdaUpdateWrapper,可以通过 new UpdateWrapper().lambda() 方法获取!

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方法名	说明	使用
set	set(“name”,“老李头”)	set(“name”,“”)
setsql	setsql(“name = ‘老李头’”)	setsql(String sql)

参考于https://blog.csdn.net/qq_43399077/article/details/104061760

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