WebMyBatis会将第一条SQL语句查询出来的该列的值用于所嵌套的SQL映射语句的入参。 因第一条SQL语句查询出来的每个该列的值都将用于执行另一个SQL语句，所以嵌套的SQL语句将被多次执行。 2.集合的嵌套结果 (resultMap) WebMar 23, 2024 · MyBatis automatically creates a ResultMap object, encapsulates the key-value pairs based on the attribute names found, and then sees that the return type is a Blog object, and assigns the key-value pairs corresponding to the Blog object from the ResultMap. It is also very useful when the return type is directly a ResultMap, which is mainly used ...
difference between collection and association mapping in …
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WebSep 24, 2024 · Mybatis中的assocication和collection 第一个是用来关联实体类的，第二个是用来关联集合的，也就是平时的一对一 (assocication)，一对多 (collection) 低调小熊猫 mybatis 中 foreach collection 的用法 List 类型的我都配置了别名list,参数是 List WebContact Us. Send comments to: [email protected]. To send your payment by mail, please use one of the following addresses: MAILING ADDRESS: Deputy Tax Collector. P.O. Box … WebApr 10, 2024 · mybatis高级映射一对多失败原因有多种。问题描述：我这里出现的问题是：在数据库中进行多表联查查询到多条记录结果是正常的一对多情况，但是mybatis映射时装载失败只保留了一条数据。1）数据库查询语句与结果如下。 compound kanji list