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MyBatis映射文件中的常用标签有哪些?
insert:用来定义insert语句。
update:用来定义update语句。
select:用来定义select语句。
delete:用来定义delete语句。
sql:用来定义SQL片段。
include: 用来引用SQL片段,将refid属性设为要引用的SQL片段的id。
where: 会生成一个where关键字并且可以过滤掉条件语句中的第一个and或or关键字。
if: 用来判断传入参数是否符合条件,如果test属性中的表达式值为true则执行if标签中的内容。一般拼接查询条件会用的比较多一些。
foreach: 用来遍历传入的数组或集合。一般批量删除会用的比较多一些。
<foreach> 元素的属性主要有 item、index、collection、open、separator、close。
collection: 指定要遍历的参数的类型,一般来说如果传入的是集合就写list,传入的是数组就写array。
index:循环的下标
item:给当前遍历的元素起别名
open:指定循环开始要拼接的字符串
close:指定循环结束要拼接的字符串
separator:指定每次循环中间的分隔符