Go

--Delete foreign keysSyntax: ALTER TABLE name DROP constraint foreign KEY constraint nameSuch as:ALTER TABLE STU_PKFK_SC DROP constraint fk_sALTER TABLE STU_PKFK_SC DROP constraint Fk_c--Add foreign keysSyntax: ALTER TABLE name ADD constraint

UniqOriginal: http://blog.csdn.net/xifeijian/article/details/9209627The Uniq command removes duplicate rows from a sorted file, so Uniq is often used in combination with sort. That is, in order for the Uniq to work, all duplicate rows must be

Recommendation 16: Arrays should not be used in cases where the number of elements is variableIn C #, once an array is created, the length cannot be changed. If we need a dynamic and variable-length collection, we should create it using ArrayList or

Go language variableThe Go language variable name consists of a letter, a number, an underscore, where the first letter cannot be a number.The general form of declaring variables is to use the var keyword:var identifier typeVariable declarationFirst,

Chapter One first knowledge of Go languageGoogle is the main push of the go language, the open source communityAutomatic garbage collectionfunction multiple return valueMemory Checker Tools Rational Purify, Compuware BoundsChecker, Parallel

Recommendation 27: Use a lambda expression in a queryLINQ is actually based on extension methods and lambda expressions. Any LINQ query can be replaced by the way it is extended.var from inch personlist Select New

Recommendation 28: Understanding the difference between deferred evaluation and active evaluationTo understand the delay evaluation (lazy evaluation) and the active evaluation (eager evaluation), let's look at an example:listint> list =Newlistint> ()

Recommendation 19: Class with more efficient objects and collections.Depending on the syntax rules after the attribute and FCL 3.5, we now have a cleaner and more efficient object and set initialization mechanism: object and collection

This is a created article in which the information may have evolved or changed. A few days before the interview with a company to get the test questions to use golang development, during the compilation process occurred a little bit of an

This is a creation in Article, where the information may have evolved or changed. Golang Rich I/O two ----version cgo Hello World InGolangRich inI/o----UseNTwoHello WorldShow "in a variety ofHello WorldThe wording of this showGolangRich and

This is a creation in Article, where the information may have evolved or changed. As the business becomes more complex, the volume of data becomes larger and the concurrency is increasing, the performance of the database becomes lower. Finally find

This is a creation in Article, where the information may have evolved or changed. One, the echo comes with the log library 1. Log structure The log structure of the echo frame is echo. An attribute of the Echo struct type Echo struct { ...

This is a creation in Article, where the information may have evolved or changed. Error handling Error The go language introduces a standard error-handling pattern, the errors interface, which is defined as follows: Type Error Interface {

This is a creation in Article, where the information may have evolved or changed. First of all, the problem of producer consumers, is that multiple producers produce goods, put in a cache, and then multiple consumers from the cache to take out and

This is a creation in Article, where the information may have evolved or changed. Golang has a good performance in asynchronous processing. Because Goroutines and channels are very easy to use and effective asynchronous processing means. Let's take

This is a creation in Article, where the information may have evolved or changed. This paper briefly introduces the lock mechanism in Go . There are two types of locks in go: Mutual exclusion Lock Read/write Lock Mutual

This is a creation in Article, where the information may have evolved or changed. Objective In Golang, concurrent programming is easy to implement and requires only one goroutine to turn on concurrency mode: gof("goroutine") However, there are a

This is a creation in Article, where the information may have evolved or changed. [Original link] (https://yc90s.github.io/2017/11/20/%E6%95%B0%E7%BB%84%E4%B8%8E%E5%88%87%E7%89%87/) # #数组 # # # definition An array is a set of data of the same type,

This is a creation in Article, where the information may have evolved or changed. Slice and Map are two important data types in Go. This article will document some of my key findings about the performance of these two data structures. Before we

This is a creation in Article, where the information may have evolved or changed. First, preface What is a cookie? Cookies are data stored in the browser side in the form of Key,value.https://baike.baidu.com/item/cookie/1119 Ii. Working