Verify the existence of a relationship in a model

综合技术 Hello, buddy! (源链)

The fastest query to verify the existence of a line in Oracle?

I’m using Oracle, and I have a very large table. I need to check for the existence of any row meeting some simple criteria. What’s the best way to go about this using simple SQL? Here’s my best guess, and while it may turn out to be fast enough for m

What is the correct way to verify the existence of a nested attribute in Chef?

There are multiple ways to check for the existence of a nested attribute in chef, and I’m not sure which is correct/best, and if any will result in empty attributes being stored on the node: node[:parent] and node[:parent][:child] node.attribute?(:pa

How to verify the existence of a key in plist?

I am trying to check for the existence of a key in a plist file in xcode. My plist file has this structure. Root (Dictionary) +- Parent1 (Dictionary) – Key1 (Boolean) – Key2 (Boolean) – Key3 (Boolean) – Key4 (Boolean) +- Parent2 (Dictionary) – Key1 (

How to verify the existence of an element with XElement?

Notice in this code I am trying to check for the existence of the rdfs:range element before trying to select it. I do this to avoid a possible null reference exception at runtime. private readonly XNamespace rdf = “http://www.w3.org/1999/02/22-rdf-sy

JQuery: Verify the existence of BR as the first or last element, including the text nodes in a paragraph

I wish to test in jQuery for the existence of a
as the very first, or very last element (including text nodes) within a paragraph. The 2 examples below would be true:

Lorem ipsum dolor sit amet consectetur, adiscipling

Verify the existence of the file with conditional Makefile

I am trying to check the existence of a file using Makefile conditionals. I’ve tried the following syntax which don’t seem to work: Path = /usr/local/myFileVer1 ifeq ($(wildcard $(Path)),) version = 1 else version = 2 endif I thought the wildcard sta

The most effective (or most stylistic) way to verify the existence of optional attributes JS?

Consider an object, user: user = { profile: { first_name: “Arthur”, last_name: “Dent” }, planet: “Earth” } What is the best way to check for existence of user.profile.first_name? I’d normally use (!!user && !!user.pro

How can I verify the existence of an object in expression bonds using sharp punches?

If my variable isn’t set, the view breaks and outputs the actual expression in the view. I want to check for the existence of the variables first. I’ve tried {{#if stats && stats.activity && stats.activity.last30Days}}

{{ stats.a

PowerShell: Use the test path to verify the existence of the file in multiple folders on a network share

I need to check for the existence of a file in multiple folders on a network share and return the name of the folder in which the file exists. I’m new to PowerShell so thus far, I can check for the existence of the file in one folder on the network s

What is the quickest way to verify the existence of a Mongodb doctor?

What’s the fastest way to check for the existence of a mongodb doc? Should I just use find and if it returns nothing? EDIT: collection.findOne {#attribute}, (err, doc) -> if err then console.log err if interaction #exists else #does not If you are ju

Verifying the existence of properties in JavaScript

I’m new to JavaScript and a little bit confused with the duck typing concept. As far as I can tell, I understood the concept. But that leads to a strange consequence in my thoughts. I will explain with the following example: I’m currently working on

Verifying the existence of a variable in the SAS code

I am not sure if I get any answer on a saturday evening, but I will give a shout :) I am trying to automize a SAS-code which does comparison in a viariable between 2-3 companies. In each task, I will probably work with different companies, so I guess

Assign a variable and verify the existence of a hash key

With the little that I know about Perl, I was surprised that this syntax doesn’t work: if (exists $wid = $dict{$w}) { print “$wid:$cn”; } It seems I can’t make the assignment $wid = $dict{$w} and check if it exists at the same time: exists argu

One way to verify the existence of a SEQUENCE using JDBC?

I need to programmatically generate sequences in a datastore, but need to be able to detect their existence and not create if they are already there. Does anybody know of the JDBC metadata necessary to extract this information? A cursory scan of Data

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