给我生成一段gin gorm 的web项目

好的，以下是一段基于gin和gorm的web项目的代码示例：

package main

import (
    "github.com/gin-gonic/gin"
    "gorm.io/driver/mysql"
    "gorm.io/gorm"
)

type User struct {
    ID   uint   `gorm:"primaryKey"`
    Name string `gorm:"not null"`
    Age  int    `gorm:"not null"`
}

func main() {
    dsn := "user:password@tcp(127.0.0.1:3306)/db_name?charset=utf8mb4&parseTime=True&loc=Local"
    db, err := gorm.Open(mysql.Open(dsn), &gorm.Config{})
    if err != nil {
        panic("failed to connect database")
    }

    // Auto Migrate
    db.AutoMigrate(&User{})

    r := gin.Default()

    // Get all users
    r.GET("/users", func(c *gin.Context) {
        var users []User
        db.Find(&users)
        c.JSON(200, users)
    })

    // Create a user
    r.POST("/users", func(c *gin.Context) {
        var user User
        if err := c.ShouldBindJSON(&user); err != nil {
            c.JSON(400, gin.H{"error": err.Error()})
            return
        }
        db.Create(&user)
        c.JSON(200, user)
    })

    // Get a user by ID
    r.GET("/users/:id", func(c *gin.Context) {
        var user User
        if err := db.First(&user, c.Param("id")).Error; err != nil {
            c.JSON(404, gin.H{"error": "User not found"})
            return
        }
        c.JSON(200, user)
    })

    // Update a user by ID
    r.PUT("/users/:id", func(c *gin.Context) {
        var user User
        if err := db.First(&user, c.Param("id")).Error; err != nil {
            c.JSON(404, gin.H{"error": "User not found"})
            return
        }
        if err := c.ShouldBindJSON(&user); err != nil {
            c.JSON(400, gin.H{"error": err.Error()})
            return
        }
        db.Save(&user)
        c.JSON(200, user)
    })

    // Delete a user by ID
    r.DELETE("/users/:id", func(c *gin.Context) {
        var user User
        if err := db.First(&user, c.Param("id")).Error; err != nil {
            c.JSON(404, gin.H{"error": "User not found"})
            return
        }
        db.Delete(&user)
        c.JSON(200, gin.H{"message": "User deleted"})
    })

    r.Run(":8080")
}

这段代码实现了一个简单的用户管理系统，可以通过HTTP接口进行用户的增删改查操作。其中使用了gin作为HTTP框架，gorm作为ORM框架，MySQL作为数据库。