MyBatis-plusSQL语句包装器QueryWrapper，包装器查询倒序返回第一个

 MyBatis-plusSQL语句包装器QueryWrapper，包装器查询倒序返回第一个

CategoryEntity categoryEntity = IotBeanUtil.copy(categoryCreateDTO, CategoryEntity.class);
QueryWrapper wrapper = new QueryWrapper<>();
QueryWrapper sort = wrapper.orderByDesc("sort").last("limit 1");
CategoryEntity sortEntity = categoryDao.selectOne(sort);       

 

 简单SQL不想写SQL语句或者复杂SQL不想在Mapper里写时可以Mybatis-plus的包装类，实现自己的业务。可读性差，建议使用xml统一管理，方便别处使用。

方法名	说明	使用
allEq(Map params)	全部=(或个别isNull)	allEq(params,true)
eq	=	eq(“table_column”,”王昭君”)
ne	<>	ne(“column”,”空想4”)
gt	>	gt(“table_column”,21)
ge	>=	ge(“table_column”,22)
lt	<	lt(“table_column”,22)
le	<=	le(“table_column”,21”)
between	cloum between ? and ?	between(“table_column”,0,21)
notBetween	cloum between ? and ?	notBetween(“table_column”,0,21)
like	cloum like ‘%王%’	like(“table_column”,”王”)
notLike	not like ‘%王%’	notLike(“table_column”,”王”)
likeLeft	like ‘%王’	likeLeft(“table_column”,”昭”)
likeRight	like ‘王%’	likeRight(“table_column”,”昭”)
isNull	is null	isNull(“table_column”)
isNotNull	is not null	isNotNull(“table_column”)
in	in (1,2,3)	in(“column”,lists)
notIn	age not in (1,2,3)	notIn(“column”,lists)
inSql	age in (1,2,3)	inSql(“column”,”‘空想4’,‘空想5’,‘空想6’”)
notInSql	age not in (1,2,3,4,5,6)	notInSql(“column”,”‘空想4’,‘空想5’,‘空想6’”)
groupBy	group by id,name	groupBy(“column”,”table_column”)
orderByAsc	order by id ASC,name ASC	orderByAsc(“column”,”table_column”)
orderByDesc	order by id DESC,name DESC	orderByDesc(“table_column”)
orderBy	order by id ASC,name ASC	orderBy(true,true,”table_column”)
having	having sum(age) > 10	having(“sum(age) > 10”)
or	id = 1 or name = ‘老王’	eq(“column”,”空想4”).or(i->i.eq(“table_column”,21) eq(“column”,”空想4”).or().eq(“column”,”空想5”)
and	and (name = ‘李白’ and status <> ‘活着’)	and(i->i.eq(“table_column”,21))
nested	(name = ‘李白’ and status <> ‘活着’)	nested(i->i.eq(“table_column”,21).eq(“column”,”空想4”))
apply	id = 1	apply(“table_column” = ‘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”)