如何使用Go语言进行代码自动生成实践

package main

//go:generate mygenerator -input=example.txt -output=example_gen.go

go get -u github.com/jinzhu/gorm
go get -u github.com/go-sql-driver/mysql

package models

type User struct {
    ID       uint   `gorm:"primary_key;auto_increment"`
    Username string `gorm:"not null;unique"`
    Password string `gorm:"not null"`
}

package main

import (
    "os"
    "text/template"
)

const codeTemplate = `
package main

import (
    "github.com/jinzhu/gorm"
)

func Migrate(db *gorm.DB) {
    {{range .}}
    db.AutoMigrate(&{{.}})
    {{end}}
}

func main() {
    db, err := gorm.Open("mysql", "user:password@tcp(localhost:3306)/database?charset=utf8&parseTime=True&loc=Local")
    if err != nil {
        panic(err)
    }

    Migrate(db)
}
`

func main() {
    tmpl, err := template.New("code").Parse(codeTemplate)
    if err != nil {
        panic(err)
    }

    models := []string{
        "models.User",
        // 可以根据具体的项目需求，添加更多的模型
    }

    err = tmpl.Execute(os.Stdout, models)
    if err != nil {
        panic(err)
    }
}

go run main.go > db.go

package main

import (
    "github.com/jinzhu/gorm"
    _ "github.com/go-sql-driver/mysql"
    // 导入生成的数据库代码
    _ "path/to/generated/package"
)

func main() {
    db, err := gorm.Open("mysql", "user:password@tcp(localhost:3306)/database?charset=utf8&parseTime=True&loc=Local")
    if err != nil {
        panic(err)
    }

    // 调用生成的函数进行数据库迁移
    Migrate(db)

    // 其他操作...
}