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What is the database/sql package and how to use it properly in Golang?

Thedatabase/sqlpackageinGoprovidesagenericinterfaceforSQLdatabasesbutrequiresaseparatedriver;2.Importthedriverwithablankidentifiertoregisterit;3.Usesql.Open("driver","DSN")tocreateasql.DBconnectionpool;4.Calldb.Ping()toverifytheco

Aug 04, 2025 am 08:36 AM

What is a pointer to a pointer in Go?

ApointertoapointerinGoallowsafunctiontomodifythepointeritself,notjustthevalueitpointsto,whichisnecessarybecauseGopassesargumentsbyvalue;1.Itusesdoubleindirection,where**ppaccessestheoriginalvaluethroughtwolevels,2.It’susefulwhenafunctionmustchangewhe

Aug 04, 2025 am 08:23 AM

go pointer

What are the best practices for working with goroutines and channels in Golang?

Alwaysmanagegoroutinelifecycleusingcontext.Contexttopreventleaksandensurecleanshutdown.2.Closechannelsonlyoncebythesenderanduseforrangetoreceiveuntilclosure.3.Chooseunbufferedchannelsforsynchronizationandbufferedonescautiouslyfordecoupling.4.Useselec

Aug 04, 2025 am 08:08 AM

State Management in Concurrent Go Applications

Avoidsharedmutablestatebyusingchannelstopassdatainsteadofdirectaccess,asdemonstratedwithachannel-basedcounterthateliminatesraceconditions.2.Usesync.Mutexorsync.RWMutextoprotectsharedstatelikecachesorconfigs,ensuringallaccesspathsareproperlylockedwhil

Aug 04, 2025 am 07:37 AM

go concurrent

What is the iota keyword and how is it used for enums in Golang?

iota is used in Go to simplify the creation of enumeration constants. It starts at 0 and automatically adds 1 per row within the const block; 1. iota is not a keyword but a predeclared identifier, which is only valid within the const block and starts again every time a new block is restarted; 2. Its value can be adjusted through expressions, such as skipping 0 or generating power of 2; 3. It is often used to simulate enumeration types, such as status codes or bit flags; 4. Support arithmetic operations to customize constant values; therefore iota is an effective mechanism in Go to handle sequential or patterned constant values.

Aug 04, 2025 am 07:12 AM

How to implement custom data types in Golang

Definecustomtypesusingthetypekeywordtoenhancetypesafetyandclarity,suchastypeUserIDint.2.Addmethodstocustomtypestoencapsulatebehavior,enablingtypeslikeCelsiustohavemeaningfuloperationsandformatting.3.Usestructstomodelcomplexdata,likePerson,andattachme

Aug 04, 2025 am 06:42 AM

What is the difference between a method and a function in Go?

In Go, the difference between a method and a function is whether there is a receiver: 1. The function has no receiver, and is independently defined and called directly, such as add(2,3); 2. The method has a receiver, bound to a specific type, and is called through instances, such as point.DistanceFromOrigin(); 3. The method can access or modify data through the receiver, while the function can only operate data through parameters; 4. The receiver is divided into value receiver and pointer receiver, and the pointer receiver can modify the original data, which is suitable for large structures or scenarios that need to be modified, and the value receiver is suitable for small immutable types; 5. All methods are functions, but not all functions are methods, and the key difference is whether the type is associated.

Aug 04, 2025 am 06:17 AM

go method

How do channels work in Go?

AchannelinGoisatypedconduitforsafelypassingdatabetweengoroutines,enablingcommunicationwithoutexplicitlocking.1.Channelsarecreatedusingmake(chanType)forunbufferedormake(chanType,capacity)forbufferedchannels.2.Dataissentandreceivedusingthe

Aug 04, 2025 am 05:23 AM

What is the purpose of the context package in Golang?

ThepurposeofthecontextpackageinGoistomanagerequest-scopeddata,cancellation,deadlines,andcoordinatedshutdownacrossgoroutines.1.Itenablescancellationofgoroutinesbysignalingthroughctx.Done()whenoperationsarenolongerneeded.2.Itallowssettingtimeoutsanddea

Aug 04, 2025 am 04:10 AM

What is the difference between new() and make() in Golang?

new() allocates zero-value memory and returns a pointer to it. It is suitable for any type, returns a *T type pointer, and the memory is initialized to a zero value; 2. make() is only used for the initialization of slice, map and channel, returning the initialized T-type value rather than a pointer, so that these types can be used immediately; 3. In actual use, make() should be selected to create slice, map and channel to ensure that they are operable, while new() is used for pointers that need to point to zero value, but is rarely used directly.

Aug 04, 2025 am 03:35 AM

Dependency Management in Go with Modules

GoModule is an official dependency management mechanism introduced by Go language from 1.11. It is a collection of related Go packages, which are versioned and dependency management through go.mod files. 1. Use gomodinit to initialize the module, generate go.mod files, define module paths and Go versions; 2. Dependency management is automatically processed by Go. When running gobuild and other commands, the dependency will be automatically downloaded and updated go.mod and go.sum files; 3.go.mod records module paths, Go versions, require dependency lists, replace replacement rules and exclude exclusion versions; 4.go.sum records the checksum of the dependency module to ensure that the build is reproducible and automatically generated by the system.

Aug 04, 2025 am 02:41 AM

What is the select statement's default case used for in Golang?

ThedefaultcaseinaGoselectstatementpreventsblockingbyexecutingimmediatelywhennochanneloperationscanproceed,enablingnon-blockingcommunication;itisusefulforcheckingchannelavailabilitywithoutwaiting,performingothertasksduringchannelinactivity,avoidingdea

Aug 04, 2025 am 02:32 AM

How to implement a simple TCP server in Golang

Importthenetandfmtpackages.2.Usenet.Listen("tcp",":8080")tostartlisteningonport8080.3.Acceptincomingconnectionsinaloopwithlistener.Accept().4.Handleeachconnectionconcurrentlyusingagoroutinethatreadsdata,echoesitback,andclosestheco

Aug 04, 2025 am 01:12 AM

How to make HTTP requests and handle responses in Golang

Use http.Get() to send a GET request and always call resp.Body.Close() to avoid resource leakage; 2. Use http.Post() or http.NewRequest() to send a POST request, which can set a custom header and use http.Client to achieve more control; 3. Always check whether resp.StatusCode is http.StatusOK, and you cannot rely solely on whether err is nil to determine whether the request is successful; 4. Use json.Unmarshal() or json.NewDecoder() to parse the JSON response, which is suitable for large response bodies to save memory; 5. By customizing

Aug 03, 2025 pm 04:06 PM

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What is the database/sql package and how to use it properly in Golang?

What is a pointer to a pointer in Go?

What are the best practices for working with goroutines and channels in Golang?

State Management in Concurrent Go Applications

What is the iota keyword and how is it used for enums in Golang?

How to implement custom data types in Golang

What is the difference between a method and a function in Go?

How do channels work in Go?

What is the purpose of the context package in Golang?

What is the difference between new() and make() in Golang?

Dependency Management in Go with Modules

What is the select statement's default case used for in Golang?

How to implement a simple TCP server in Golang

How to make HTTP requests and handle responses in Golang

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