Golang is an efficient programming language that is widely used in network programming, system programming, data processing and other fields. In Golang, implementing CRUD operations is a very common task. This article will introduce how to use Golang to implement CRUD operations.
1. Database connection
To connect to the database in Golang, third-party libraries are usually used. The more commonly used ones are gorm and sqlx. This article uses gorm as an example.
First, you need to install the gorm library:
go get -u github.com/jinzhu/gorm
Then introduce the gorm library into the code:
import ( "github.com/jinzhu/gorm" _ "github.com/jinzhu/gorm/dialects/mysql" )
Then connect to the database:
db, err := gorm.Open("mysql", "root:password@tcp(127.0.0.1:3306)/testdb?charset=utf8mb4&parseTime=True&loc=Local") defer db.Close()
Among them, root represents the user name, password represents the password, tcp (127.0.0.1:3306) represents the IP address and port number of the connection, and testdb represents the desired The name of the connected database. charset represents the character set, parseTime represents whether to parse time type fields, and loc represents the time zone.
2. Add data
gorm provides two ways to add data, namely create and save, both of which can be operated using structures.
// 使用create方式 db.Create(&User{Name: "Alice", Age: 18}) // 使用save方式 user := &User{Name: "Bob", Age: 20} db.Save(user)
3. Query data
gorm provides a variety of query statements, such as Find, First, Last, Where, etc. Through these methods, the query function can be realized very conveniently.
// 查询全部数据 var users []User db.Find(&users) // 查询单条数据 var user User db.First(&user, "id = ?", 1) // 条件查询 var users []User db.Where("age > ?", 18).Find(&users) // 分页查询 var users []User db.Where("age > ?", 18).Offset(0).Limit(10).Find(&users)
Among them, Offset indicates which record to start querying from, and Limit indicates how many records to query.
4. Update data
gorm provides two ways to update data, namely save and update. The difference between the two methods is that save updates the entire structure, while update only updates the data. Update the specified field.
// 使用save方式 user := &User{Name: "Alice", Age: 18} db.Save(user) // 使用update方式 db.Model(&User{}).Where("id = ?", 1).Update("name", "Bob")
5. Delete data
gorm provides the Delete method for deletion operations and supports passing in structures or conditional expressions.
// 删除指定ID的数据 db.Delete(&User{}, 1) // 根据条件删除数据 db.Where("age < ?", 18).Delete(&User{})
6. Summary
Using gorm can easily implement CRUD operations in Golang. Through the introduction of this article, I believe readers can easily master the basic usage of gorm. In actual development, corresponding improvements and optimizations need to be made based on business needs to make the code more efficient and easier to maintain.
The above is the detailed content of golang addition, deletion, modification and query. For more information, please follow other related articles on the PHP Chinese website!

This article explains Go's package import mechanisms: named imports (e.g., import "fmt") and blank imports (e.g., import _ "fmt"). Named imports make package contents accessible, while blank imports only execute t

This article explains Beego's NewFlash() function for inter-page data transfer in web applications. It focuses on using NewFlash() to display temporary messages (success, error, warning) between controllers, leveraging the session mechanism. Limita

This article details efficient conversion of MySQL query results into Go struct slices. It emphasizes using database/sql's Scan method for optimal performance, avoiding manual parsing. Best practices for struct field mapping using db tags and robus

This article demonstrates creating mocks and stubs in Go for unit testing. It emphasizes using interfaces, provides examples of mock implementations, and discusses best practices like keeping mocks focused and using assertion libraries. The articl

This article explores Go's custom type constraints for generics. It details how interfaces define minimum type requirements for generic functions, improving type safety and code reusability. The article also discusses limitations and best practices

This article details efficient file writing in Go, comparing os.WriteFile (suitable for small files) with os.OpenFile and buffered writes (optimal for large files). It emphasizes robust error handling, using defer, and checking for specific errors.

The article discusses writing unit tests in Go, covering best practices, mocking techniques, and tools for efficient test management.

This article explores using tracing tools to analyze Go application execution flow. It discusses manual and automatic instrumentation techniques, comparing tools like Jaeger, Zipkin, and OpenTelemetry, and highlighting effective data visualization


Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

AI Hentai Generator
Generate AI Hentai for free.

Hot Article

Hot Tools

mPDF
mPDF is a PHP library that can generate PDF files from UTF-8 encoded HTML. The original author, Ian Back, wrote mPDF to output PDF files "on the fly" from his website and handle different languages. It is slower than original scripts like HTML2FPDF and produces larger files when using Unicode fonts, but supports CSS styles etc. and has a lot of enhancements. Supports almost all languages, including RTL (Arabic and Hebrew) and CJK (Chinese, Japanese and Korean). Supports nested block-level elements (such as P, DIV),

SublimeText3 English version
Recommended: Win version, supports code prompts!

Dreamweaver Mac version
Visual web development tools

Atom editor mac version download
The most popular open source editor

Zend Studio 13.0.1
Powerful PHP integrated development environment
