Golang compilation error: 'undefined: log.Println' How to solve it?

FornewGo1.21 projects,useslogforofficialstructuredloggingsupport;2.Forhigh-performanceproductionservices,chooseZaporZerologduetotheirspeedandlowallocations;3.ForeaseofuseandrichintegrationslikeSlackorSentryhooks,Logrusisidealdespitelowerperformance;4

UseURLpathversioninglike/api/v1forclear,routable,anddeveloper-friendlyversioning.2.Applysemanticversioningwithmajorversions(v1,v2)only,avoidingmicro-versionslikev1.1topreventroutingcomplexity.3.OptionallysupportcontentnegotiationviaAcceptheadersifalr

Install MongoDBGo driver and use mongo.Connect() to establish a connection to ensure the connection is successful through Ping; 2. Define a Go structure with bson tag to map MongoDB documents, optionally use primitive.ObjectID as the ID type; 3. Use InsertOne to insert a single document, FindOne query a single document and handle mongo.ErrNoDocuments errors, UpdateOne updates the document, DeleteOne deletes the document, Find cooperates with cursor.All to get multiple documents; 4. Always use a context with timeout to avoid request hangs, and reuse Mon

In Go, observer mode can be implemented through interfaces and channels, the Observer interface can be defined, the Observer interface includes the Update method, the Subject structure maintains the observer list and message channel, add observers through Attach, Notify sends messages, listengoroutine asynchronous broadcast updates, specific observers such as EmailService and LogService implement the Update method to handle notifications, the main program registers the observer and triggers events, and realizes a loosely coupled event notification mechanism, which is suitable for event-driven systems, logging and message notifications and other scenarios.

Gohandlesconcurrencythroughgoroutinesandchannels,makingitsimpleandefficienttowriteconcurrentprograms.1.GoroutinesarelightweightthreadsmanagedbytheGoruntime,startedwiththegokeyword,andcanscaletothousandsormillionsduetosmallinitialstacksize,efficientsc

Gobenchmarkingmeasurescodeperformancebytimingfunctionexecutionandmemoryusage,usingbuilt-intestingtools;benchmarksarewrittenin_test.gofileswithnamesstartingwithBenchmark,takeatesting.Bparameter,andruntargetcodeinaloopcontrolledbyb.N,whichGoautomatical

UnderstandGo’smemoryallocationmodelbyusingescapeanalysistominimizeheapallocations;2.Reduceheapallocationswithvaluetypes,pre-allocatedslices,andsync.Poolforbufferreuse;3.Optimizestringandbytehandlingusingstrings.Builderandreusablebyteslicestoavoidunne

Use the correct benchmark function structure, name starts with BenchmarkXxx, and use b.N to automatically adjust the number of iterations; 2. Avoid unused results, set code mixing timing and memory allocation interference, eliminate deviations through black box variables or b.ResetTimer(); 3. Use b.Run() to test different input scales to analyze performance scalability; 4. Keep the environment stable, turn off background interference, control GOMAXPROCS and use -benchmem to view memory allocation; 5. Use the benchmark tool to run multiple times and analyze the results to ensure the reliability of the comparison. Follow these steps to obtain accurate, repeatable Go benchmark results.