How to learn and use Go’s ORM framework GORM

GORM is an ORM framework for the Go programming language, whose full name is "Go Object Relational Mapping". It is a powerful ORM that is easy to use and efficient. Below we will introduce in detail how to learn and use GORM.

1. What is the ORM framework?
   The ORM framework is a software tool that allows developers to access and manipulate databases using an object model provided by a programming language. ORM is the abbreviation of "Object Relational Mapping". ORM helps simplify database access, making code more readable and easier to maintain.
2. Introduction to the GORM framework
   GORM is a lightweight ORM framework that can be used to handle the interaction between the Go programming language and MySQL, PostgreSQL and SQLite. It is based on the concepts of other ORM frameworks and provides ease of use and efficiency without losing flexibility.
3. Steps to use GORM
   The following are the steps to use the GORM framework:

4. Installing GORM
   Before you start using GORM, you need to download and install it. The installation process is simple. You can use the following command to install GORM:

   go get -u github.com/jinzhu/gorm

5. Connect to the database
   When using GORM, you need to set the database connection information in the configuration file. Here is an example of connecting to a MySQL database:

   import (
     "github.com/jinzhu/gorm"
     _ "github.com/go-sql-driver/mysql"
   )
   
   func main() {
     db, err := gorm.Open("mysql", "{username}:{password}@tcp({host}:{port})/{database}?charset=utf8&parseTime=True&loc=Local")
     if err != nil {
    panic(err)
     }
     defer db.Close()
   }

   In order to perform database operations, you need to pass it to GORM. The following is sample code for passing a database example to GORM:

   db, err := gorm.Open("mysql", "{username}:{password}@tcp({host}:{port})/{database}?charset=utf8&parseTime=True&loc=Local")
   if err != nil {
     panic(err)
   }
   defer db.Close()
   
   type User struct {
     ID   uint   `gorm:"primary_key"`
     Name string `gorm:"size:255"`
   }
   
   // 创建表
   db.CreateTable(&User{})

6. Operation data table
   GORM provides various methods for adding, deleting, modifying, and querying data tables. Here are some common usage example codes for GORM:

7. query

   db.First(&user, 1)
   // SELECT * FROM users WHERE id = 1;
   
   db.Find(&users)
   // SELECT * FROM users;
   
   db.Where("name = ?", "jinzhu").Find(&users)
   // SELECT * FROM users WHERE name = 'jinzhu';

8. insert

   db.Create(&User{Name: "jinzhu"})
   // INSERT INTO users (name) VALUES ("jinzhu");

9. update

   db.Model(&user).Update("name", "jinzhu")
   // UPDATE users SET name = "jinzhu" WHERE id = 1;

10. Delete

    db.Delete(&user)
    // DELETE FROM users WHERE id = 1;

11. Summary
    GORM is a simple, easy-to-use Go ORM framework. You can easily use it for database access. In the process of learning to use GORM, you need to become familiar with its basics. With proper study and practice, you will be able to effectively use GORM to solve various database access problems.

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