(图片有点大,可右键新tab查看) User模型 class User extends Model { public function profile() { return $this->hasMany(UserProfile::class); } } 使用with查询某个user及其的profile User::with(['profile' => function($query) { $query->select(['id']); }])->find(4)->toArra…

通常筛选一个数组,通常会在代码的其它地方创建一个函数,然后为数组的每个元素调用它.但这样做会使代码分散在许多地方,不便于阅读.使用闭包就可以将相关代码片断放在一起,使结构逻辑更加清晰. 比如,筛选一个字符数组,过滤出以“hangge”开头的字符串数组 1 2 3 4 5 let array = ["hangge","com","hangge.com"] let filteredArray = array.filter(){     return…

# C:\Users\lenovo\Desktop\总结\Python # 读取 Excel 文件并进行筛选 import pandas as pd # 设置列对齐 pd.set_option("display.unicode.ambiguous_as_wide",True) pd.set_option("display.unicode.east_asian_width",True) # 读取工号姓名时段交易额,使用默认索引 dataframe = pd.read_…

最近搞数据库,为了把图片文件的信息导入数据库表中,我开始研究python列出图片文件,其中发现因为IE临时文件里有非常多的不需要的图片,就需要筛选掉一些文件. 最终用python输出了所有需要的图片文件的路径.文件名.时间到一个txt import os import time def IsObjfile( path , filename , suffix , shield ): #判断文件是否以suffix中的串结尾以及是否有不需要的文件路径 flag1 = False for tmp in…

https://learnku.com/docs/laravel/5.8/eloquent/3931 示例1: $flights = App\Flight::all(); foreach ($flights as $flight) { echo $flight->name; } 函数源码参考: vendor\laravel\framework\src\Illuminate\Database\Eloquent\Model.php 示例2: $flights = App\Flight::where(…

awk '/^>/ {printf("\n%s\t",$0);next;} {printf("%s",$0);} END {printf("\n");}' < assembly.fasta | egrep -v '^$' | tr "\t" "\n" | awk '!/^>/ { next } { getline seq } length(seq) > 200 { print $0…

<p>显示 .xls, .xlsx, .csv 文件...</p> <input type="file" accept=".csv, application/vnd.openxmlformats-officedocument.spreadsheetml.sheet, application/vnd.ms-excel" ID="fileSelect" runat="server" /> <…

<p>显示 .xls, .xlsx, .csv 文件...</p><input type="file" accept=".csv, application/vnd.openxmlformats-officedocument.spreadsheetml.sheet, application/vnd.ms-excel" ID="fileSelect" runat="server" /> <…

摘自:http://makble.com/what-is-term-vector-in-lucene given a document, find all its terms and the positions information of these terms. Index tell us which document matched , term vector tells us how and where its matched. A classic example is search r…

> db.articles.createIndex( { subject: "text" } ) { "createdCollectionAutomatically" : true, , , } > db.articles.insert( ... [ ... { _id: , subject: }, ... { _id: , subject: }, ... { _id: , subject: }, ... { _id: , subject: }, ...…