从list集合中抽取getId转为新的集合: List<NatCustomers> natCustomersList = natCustomersService.queryListByPage(0,1000); List<Integer> customerIds ...
从list集合中抽取getId转为新的集合: List<NatCustomers> natCustomersList = natCustomersService.queryListByPage(0,1000); List<Integer> customerIds ...
fieldName:替换成相应的字段 ...
了变化) 查询出来的结果集中会多一个count字段,这个字段就是将分组后的数据按照我们的排序规 ...
分组前数据: [ {"f1":"q","f2":"w","f3":"e","f4":"r"}, {"f1":"q","f2":"w","f3":"e","f4":"r"}, {"f1":"w","f2":"w","f3":"e","f4":"r"}, {"f1":"w","f2":"w","f3 ...
变型: 遍历:数组或对象 总结: 首先拿到的是一堆未分组的数组:[{...}]; 其次根据某个字段进行分组等到: 1.对象:{key:[...]} 2.新数组:[ { name:key,data ...
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<?php $arr = [ [ 'id'=>1, 'name'=>'Tom' ], ...
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