MyBaitsPlus--条件构造器Wrapper

AbstractWrapper

QueryWrapper(LambdaQueryWrapper) 和 UpdateWrapper(LambdaUpdateWrapper) 的父类
用于生成 sql 的 where 条件, entity 属性也用于生成 sql 的 where 条件

注意: entity 生成的 where 条件与 使用各个 api 生成的 where 条件没有任何关联行为

allEq

全部eq(或个别isNull)

allEq(Map<R, V> params)
allEq(Map<R, V> params, boolean null2IsNull)
allEq(boolean condition, Map<R, V> params, boolean null2IsNull)

• params : key为数据库字段名,value为字段值
• null2IsNull : 为true则在map的value为null时调用 isNull 方法,为false时则忽略value为null的

    例1: allEq({id:1,name:"老王",age:null})--->id = 1 and name = '老王' and age is null
    例2: allEq({id:1,name:"老王",age:null}, false)--->id = 1 and name = '老王'

allEq(BiPredicate<R, V> filter, Map<R, V> params)
allEq(BiPredicate<R, V> filter, Map<R, V> params, boolean null2IsNull)
allEq(boolean condition, BiPredicate<R, V> filter, Map<R, V> params, boolean null2IsNull) 

• filter : 过滤函数,是否允许字段传入比对条件中
• params 与 null2IsNull : 同上

    例1: allEq((k,v) -> k.indexOf("a") >= 0, {id:1,name:"老王",age:null})--->name = '老王' and age is null
    例2: allEq((k,v) -> k.indexOf("a") >= 0, {id:1,name:"老王",age:null}, false)--->name = '老王'

eq

等于

eq(R column, Object val)
eq(boolean condition, R column, Object val)

• 例: eq(“name”, “老王”)—>name = ‘老王’

ne

不等于

ne(R column, Object val)
ne(boolean condition, R column, Object val)

• 例: ne(“name”, “老王”)—>name <> ‘老王’

gt

大于 >

ge(R column, Object val)
ge(boolean condition, R column, Object val)

• 例: ge(“age”, 18)—>age >= 18

ge

大于等于

ge(R column, Object val)
ge(boolean condition, R column, Object val)

• 例: ge(“age”, 18)—>age >= 18

lt

小于 <

lt(R column, Object val)
lt(boolean condition, R column, Object val)

• 例: lt(“age”, 18)—>age < 18

le

小于等于 <=

le(R column, Object val)
le(boolean condition, R column, Object val)

• le(“age”, 18)—>age <= 18

between

BETWEEN 值1 AND 值2

between(R column, Object val1, Object val2)
between(boolean condition, R column, Object val1, Object val2)

• 例: between(“age”, 18, 30)—>age between 18 and 30

notBetween

NOT BETWEEN 值1 AND 值2

notBetween(R column, Object val1, Object val2)
notBetween(boolean condition, R column, Object val1, Object val2)

• 例: notBetween(“age”, 18, 30)—>age not between 18 and 30

like

LIKE ‘%值%’

like(R column, Object val)
like(boolean condition, R column, Object val)

• 例: like(“name”, “王”)—>name like ‘%王%’

notLike

NOT LIKE ‘%值%’

notLike(R column, Object val)
notLike(boolean condition, R column, Object val)

• 例: notLike(“name”, “王”)—>name not like ‘%王%’

likeLeft

LIKE ‘%值’

likeLeft(R column, Object val)
likeLeft(boolean condition, R column, Object val)

• 例: likeLeft(“name”, “王”)—>name like ‘%王’

likeRight

LIKE ‘值%’

likeRight(R column, Object val)
likeRight(boolean condition, R column, Object val)

• 例: likeRight(“name”, “王”)—>name like ‘王%’

isNull

字段 IS NULL

isNull(R column)
isNull(boolean condition, R column)

• 例: isNull(“name”)—>name is null

isNotNull

字段 IS NOT NULL

isNotNull(R column)
isNotNull(boolean condition, R column)

• 例: isNotNull(“name”)—>name is not null

in

字段 IN (value.get(0), value.get(1), …)

in(R column, Collection<?> value)
in(boolean condition, R column, Collection<?> value)

• 例: in(“age”,{1,2,3})—>age in (1,2,3)

字段 IN (v0, v1, …)

in(R column, Object... values)
in(boolean condition, R column, Object... values)

• 例: in(“age”, 1, 2, 3)—>age in (1,2,3)

notIn

字段 NOT IN (value.get(0), value.get(1), …)

notIn(R column, Collection<?> value)
notIn(boolean condition, R column, Collection<?> value)

• 例: notIn(“age”,{1,2,3})—>age not in (1,2,3)

字段 NOT IN (v0, v1, …)

notIn(R column, Object... values)
notIn(boolean condition, R column, Object... values)

• 例: notIn(“age”, 1, 2, 3)—>age not in (1,2,3)

inSql

用于嵌套查询：字段 IN (sql语句)

inSql(R column, String inValue)
inSql(boolean condition, R column, String inValue)

• 例: inSql(“age”, “1,2,3,4,5,6”)—>age in (1,2,3,4,5,6)
• 例: inSql(“id”, “select id from table where id < 3”)—>id in (select id from table where id < 3)

notInSql

字段 NOT IN (sql语句)

notInSql(R column, String inValue)
notInSql(boolean condition, R column, String inValue)

• 例: notInSql(“age”, “1,2,3,4,5,6”)—>age not in (1,2,3,4,5,6)
• 例: notInSql(“id”, “select id from table where id < 3”)—>age not in (select id from table where id < 3)

groupBy

分组：GROUP BY 字段, …

groupBy(R... columns)
groupBy(boolean condition, R... columns)

• 例: groupBy(“id”, “name”)—>group by id,name

orderByAse

排序：ORDER BY 字段, … ASC

orderByAsc(R... columns)
orderByAsc(boolean condition, R... columns)

• 例: orderByAsc(“id”, “name”)—>order by id ASC,name ASC

orderByDesc

排序：ORDER BY 字段，… DESC

orderByDesc(R... columns)
orderByDesc(boolean condition, R... columns)

• 例: orderBy(true, true, “id”, “name”)—>order by id ASC,name ASC

orderBy

排序 ORDER BY 字段, …

orderBy(boolean condition, boolean isAsc, R... columns)

• 例: orderBy(true, true, “id”, “name”)—>order by id ASC,name ASC

having

HAVING (sql语句)

having(String sqlHaving, Object... params)
having(boolean condition, String sqlHaving, Object... params)

• 例: having(“sum(age) > 10”)—>having sum(age) > 10
• 例: having(“sum(age) > {0}”, 11)—>having sum(age) > 11

or

拼接 OR
主动调用or表示紧接着下一个方法不是用and连接!(不调用or则默认为使用and连接)

or()
or(boolean condition)

• 例: eq(“id”,1).or().eq(“name”,“老王”)—>id = 1 or name = ‘老王’

OR 嵌套

• 例: or(i -> i.eq(“name”, “李白”).ne(“status”, “活着”))—>or (name = ‘李白’ and status <> ‘活着’)

and

AND 嵌套

and(Consumer<Param> consumer)
and(boolean condition, Consumer<Param> consumer)

• 例: and(i -> i.eq(“name”, “李白”).ne(“status”, “活着”))—>and (name = ‘李白’ and status <> ‘活着’)

nested

正常嵌套 不带AND或者OR

nested(Consumer<Param> consumer)
nested(boolean condition, Consumer<Param> consumer)

• 例: nested(i -> i.eq(“name”, “李白”).ne(“status”, “活着”))—>(name = ‘李白’ and status <> ‘活着’)

apply

拼接sql

apply(String applySql, Object... params)
apply(boolean condition, String applySql, Object... params)

注意事项：
该方法可用于数据库函数 动态入参的params对应前面applySql内部的{index}部分.这样是不会有sql注入风险的,反之会有!

• 例: apply(“id = 1”)—>id = 1
• 例: apply(“date_format(dateColumn,’%Y-%m-%d’) = ‘2008-08-08’”)—>date_format(dateColumn,’%Y-%m-%d’) = ‘2008-08-08’")
• 例: apply(“date_format(dateColumn,’%Y-%m-%d’) = {0}”, “2008-08-08”)—>date_format(dateColumn,’%Y-%m-%d’) = ‘2008-08-08’")

last

无视优化规则直接拼接到sql的最后

last(String lastSql)
last(boolean condition, String lastSql)

注意事项:只能调用一次,多次调用以最后一次为准 有sql注入的风险,请谨慎使用

• 例: last(“limit 1”)

exists

拼接EXISTS (sql语句)

exists(String existsSql)
exists(boolean condition, String existsSql)

• 例: exists(“select id from table where age = 1”)—>exists (select id from table where age = 1)

notExists

拼接NOT EXISTS（sql语句）

notExists(String notExistsSql)
notExists(boolean condition, String notExistsSql)

• 例: notExists(“select id from table where age = 1”)—>not exists (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
• LambdaQueryWrapper, 可以通过 new QueryWrapper().lambda() 方法获取

select

设置查询字段

select(String... sqlSelect)
select(Predicate<TableFieldInfo> predicate)
select(Class<T> entityClass, Predicate<TableFieldInfo> predicate)

以上方分法为两类：
第二类方法为:过滤查询字段(主键除外),入参不包含 class 的调用前需要wrapper内的entity属性有值! 这两类方法重复调用以最后一次为准

• 例: select(“id”, “name”, “age”)
• 例: select(i -> i.getProperty().startsWith(“test”))

UpdateWrapper

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

set

SQL SET 字段

set(String column, Object val)
set(boolean condition, String column, Object val)

• 例: set(“name”, “老李头”)
• 例: set(“name”, “”)—>数据库字段值变为空字符串
• 例: set(“name”, null)—>数据库字段值变为null

setSql

设置SET部分SQL

setSql(String sql)

• 例: setSql(“name = ‘老李头’”)

lambda

获取LambdaWrapper

• 在QueryWrapper中是获取LambdaQueryWrapper
• 在UpdateWrapper中是获取LambdaUpdateWrapper