match

Update column based on matching values in other table in mysql

人走茶凉 提交于 2020-01-13 09:25:30
问题 I have two tables calendar and customer table. Calendar table have a "customer" column which has customer table "ID" as value. But unfortunately, this calendar customer field value was wrongly populated with other values. Both tables have these common fields Date, SeatingID and BusID. How to update the calendar table customer field based on these common fields?. Below is the structure of both tables. Customer Table calendar Table 回答1: You can UPDATE the Customer field of the second table

Why can I compare a String to a &str using if, but not when using match?

。_饼干妹妹 提交于 2020-01-13 08:33:11
问题 I'm trying to implement a function that reads command line arguments and compares them to hard-coded string literals. When I do the comparison with an if statement it works like a charm: fn main() { let s = String::from("holla!"); if s == "holla!" { println!("it worked!"); } } But using a match statement (which I guess would be more elegant): fn main() { let s = String::from("holla!"); match s { "holla!" => println!("it worked!"), _ => println!("nothing"), } } I keep getting an error from the

Why can I compare a String to a &str using if, but not when using match?

我怕爱的太早我们不能终老 提交于 2020-01-13 08:32:29
问题 I'm trying to implement a function that reads command line arguments and compares them to hard-coded string literals. When I do the comparison with an if statement it works like a charm: fn main() { let s = String::from("holla!"); if s == "holla!" { println!("it worked!"); } } But using a match statement (which I guess would be more elegant): fn main() { let s = String::from("holla!"); match s { "holla!" => println!("it worked!"), _ => println!("nothing"), } } I keep getting an error from the

027 Android 可扩展的listview:ExpandableListView的使用案例

人盡茶涼 提交于 2020-01-13 08:08:02
1.ExpandableListView简介 ExpandableListView是一种用于垂直滚动展示两级列表的视图,和 ListView 的不同之处就是它可以展示两级列表,分组可以单独展开显示子选项。这些选项的数据是通过 ExpandableListAdapter 关联的。 2.xml页面布局 (1)主界面布局(CommonNumberQueryActivity对应布局) <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" tools:context=".CommonNumberQueryActivity"> <TextView style="@style/TitleStyle" android:text=

Python 正则表达式

筅森魡賤 提交于 2020-01-13 00:21:47
Python 正则表达式 正则表达式是一个特殊的字符序列,它能帮助你方便的检查一个字符串是否与某种模式匹配。 Python 自1.5版本起增加了re 模块,它提供 Perl 风格的正则表达式模式。 re 模块使 Python 语言拥有全部的正则表达式功能。 compile 函数根据一个模式字符串和可选的标志参数生成一个正则表达式对象。该对象拥有一系列方法用于正则表达式匹配和替换。 re 模块也提供了与这些方法功能完全一致的函数,这些函数使用一个模式字符串做为它们的第一个参数。 本章节主要介绍Python中常用的正则表达式处理函数。 re.match函数 re.match 尝试从字符串的起始位置匹配一个模式,如果不是起始位置匹配成功的话,match()就返回none。 函数语法 : re.match(pattern, string, flags=0) 函数参数说明: 参数 描述 pattern 匹配的正则表达式 string 要匹配的字符串。 flags 标志位,用于控制正则表达式的匹配方式,如:是否区分大小写,多行匹配等等。参见:正则表达式修饰符 - 可选标志 匹配成功re.match方法返回一个匹配的对象,否则返回None。 我们可以使用group(num) 或 groups() 匹配对象函数来获取匹配表达式。 匹配对象方法 描述 group(num=0)

学习python库:elasticsearch-dsl

不问归期 提交于 2020-01-12 01:45:26
一、简介 elasticsearch-dsl是基于elasticsearch-py封装实现的,提供了更简便的操作elasticsearch的方法。 二、具体使用 elasticsearch的官方文档介绍一共包括六个部分,分别是:configuration、search dsl、persistence、update by query、API document。 2.1 Configuration 有许多方式可以配置连接,最简单且有效的方式是设置默认连接,该默认连接可以被未传递其他连接的API调用使用。 2.1.1 Default connection 默认连接的实现需要使用到connections.create_connection()方法。 from elasticsearch_dsl import connections connections.create_connection(hosts=['localhost'], timeout=20) 同时还可以通过alias给连接设置别名,后续可以通过别名来引用该连接,默认别名为default from elasticsearch_dsl import connections connections.create_connection(alias='my_new_connection', hosts=['localhost'],

Get the first and last visible element in a scrollable div

谁都会走 提交于 2020-01-12 01:36:27
问题 I have list of thumbs in a scrollable div, animated with next/prev button. Each click on "next "button should match the attribute of the first visible element. Each click on "prev" button should give me the attribute of the last visible element. I don't really know how to mathematically solve that, because the scroll distance is variable when the list ends. Can someone please help me out? HTML $<div id="scrollContent"> <ul id="assetList"> <li data-asset-id="15201"></li> <li data-asset-id=

Python's 'match' line in _sre.SRE_Match output? Can it show the full match?

时光怂恿深爱的人放手 提交于 2020-01-11 14:12:00
问题 Using python 3: In [275]: blah = "ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffg" In [276]: pat = re.compile("([a-z]{2,9999})") In [277]: data = re.search(pat,blah) In [278]: data Out[278]: <_sre.SRE_Match object; span=(0, 125), match='fffffffffffffffffffffffffffffffffffffffffffffffff> Is it possible for match='' to print out the whole string? i.e all the way to the final 'g' ? 回答1: No, it is not possible. That

Python's 'match' line in _sre.SRE_Match output? Can it show the full match?

大兔子大兔子 提交于 2020-01-11 14:08:25
问题 Using python 3: In [275]: blah = "ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffg" In [276]: pat = re.compile("([a-z]{2,9999})") In [277]: data = re.search(pat,blah) In [278]: data Out[278]: <_sre.SRE_Match object; span=(0, 125), match='fffffffffffffffffffffffffffffffffffffffffffffffff> Is it possible for match='' to print out the whole string? i.e all the way to the final 'g' ? 回答1: No, it is not possible. That

Find duplicate items within a list of list of tuples Python

故事扮演 提交于 2020-01-11 06:42:14
问题 I want to find the matching item from the below given list.My List may be super large. The very first item in the tuple "N1_10" is duplicated and matched with another item in another array tuple in 1st array in the ListA ('N1_10', 'N2_28') tuple in 2nd array in the ListA ('N1_10', 'N3_98') ListA = [[('N1_10', 'N2_28'), ('N1_35', 'N2_44')], [('N1_22', 'N3_72'), ('N1_10', 'N3_98')], [('N2_33', 'N3_28'), ('N2_55', 'N3_62'), ('N2_61', 'N3_37')]] what I want for the output is output --> [('N1_10',