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一、AbstractWrapper

用于生成sql的where条件，当第一个入参数为boolean condition时，表示该条件是否加入最后成的sql中。

1、allEq

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

（1）params

key为数据库字段名，value为字段值。

（2）null2IsNull

为true，则在map的value为null时调用isNull方法，false时则忽略value为null的。

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) 

（1）filter

过滤函数，是否允许字段传入对比条件中。

2、eq

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

3、ne

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

4、gt

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

5、ge

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

6、lt

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

7、le

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

8、between

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

9、notBetween

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

10、like

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

11、notLike

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

12、likeLeft

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

13、likeRight

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

14、isNull

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

15、isNotNull

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

16、in

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

17、notIn

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

18、inSql

inSql(R column, String inValue)
inSql(boolean condition, R column, String inValue)
//示例
 inSql("id", "select id from table where id < 3")--->id in (select id from table where id < 3)

19、notInSql

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

20、groupBy

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

21、orderByAsc

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

22、orderByDesc

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

23、orderBy

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

24、having

having(String sqlHaving, Object... params)
having(boolean condition, String sqlHaving, Object... params)
//示例
having("sum(age) > {0}", 11)--->having sum(age) > 11

25、func

func(Consumer<Children> consumer)
func(boolean condition, Consumer<Children> consumer)
//示例
func(i -> if(true) {i.eq("id", 1)} else {i.ne("id", 1)})

26、or

or()
or(boolean condition)
or(Consumer<Param> consumer)
or(boolean condition, Consumer<Param> consumer)
//示例
or(i -> i.eq("name", "李白").ne("status", "活着"))--->or (name = '李白' and status <> '活着')

27、and

and(Consumer<Param> consumer)
and(boolean condition, Consumer<Param> consumer)
// 示例
and(i -> i.eq("name", "李白").ne("status", "活着"))--->and (name = '李白' and status <> '活着')

28、nested

nested(Consumer<Param> consumer)
nested(boolean condition, Consumer<Param> consumer)
// 示例，生成代码中不带and或or
nested(i -> i.eq("name", "李白").ne("status", "活着"))--->(name = '李白' and status <> '活着')

29、apply

apply(String applySql, Object... params)
apply(boolean condition, String applySql, Object... params)
//动态入参数，可以防止sql注入
apply("date_format(dateColumn,'%Y-%m-%d') = {0}", "2008-08-08")--->date_format(dateColumn,'%Y-%m-%d') = '2008-08-08'")

30、last

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

// 使用last添加limit条件
last("limit 3")

无视优化规则，直接拼接到sql最后，只能调用一次，多次调用 以最后一次为准。

31、exist

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

32、notExist

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

二、QueryWrapper

继承自AbstractWrapper，自身内部属性entity可用于生成where条件。

（1）select

select(String... sqlSelect)
select(Predicate<TableFieldInfo> predicate)
select(Class<T> entityClass, Predicate<TableFieldInfo> predicate)
// 示例
select("id", "name", "age")
select(i -> i.getProperty().startsWith("test"))

三、UpdateWrapper

继承自AbstractWrapper，自身的内部属性entity也用于生成where条件。

1、set

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

2、setSql

setSql(String sql)
// 示例
setSql("name = '老李头'")

四、lambda

在QueryWrapper中是获取LambdaQueryWrapper

在UpdateWrapper中获取LambdaUpdateWrapper

五、自定义SQL

需要版本不低于3.0.7，param参数名要么叫ew，要么加上注解@Param(Constants.WRAPPER)使用${ew.customSqlSegment}不支持Wrapper内的entity生成where语句。

1、用注解

@Select("select * from mysql_data ${ew.customSqlSegment}")
List<MysqlData> getAll(@Param(Constants.WRAPPER) Wrapper wrapper);

2、用XML

List<MysqlData> getAll(Wrapper ew);

<select id="getAll" resultType="MysqlData">
	SELECT * FROM mysql_data ${ew.customSqlSegment}
</select>