From 1d6ae20b373217a970269cca6c35d6c14d7a8bef Mon Sep 17 00:00:00 2001
From: hhniao <448455556@qq.com>
Date: Sun, 9 Mar 2025 15:01:33 +0800
Subject: [PATCH] =?UTF-8?q?=E8=87=AA=E5=AE=9A=E4=B9=89=E7=B1=BB=E5=9E=8BSc?=
 =?UTF-8?q?an,=20null=E5=80=BC=E8=A2=AB=E8=B7=B3=E8=BF=87=E4=BA=86?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 main.go | 78 +++++++++++++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 76 insertions(+), 2 deletions(-)

diff --git a/main.go b/main.go
index 50e8d8d3..cee81287 100644
--- a/main.go
+++ b/main.go
@@ -1,7 +1,81 @@
 package main
 
-import "fmt"
+import (
+	"database/sql/driver"
+	"encoding/json"
+	"fmt"
+	"gorm.io/driver/mysql"
+	"gorm.io/gorm"
+)
+
+type SimpleFiles []map[string]any
+
+// Value 实现 driver.Valuer 接口，将整个切片序列化为 JSON 数组
+func (s SimpleFiles) Value() (driver.Value, error) {
+	if s == nil {
+		return nil, nil
+	}
+	return json.Marshal(s)
+}
+
+// Scan 实现 sql.Scanner 接口，将 JSON 数组解析到切片中
+func (s *SimpleFiles) Scan(value interface{}) error {
+	*s = make(SimpleFiles, 0) // 初始化为空切片
+	if value == nil {
+		return nil // 处理数据库的 NULL
+	}
+
+	b, ok := value.([]byte)
+	if !ok {
+		return nil
+	}
+
+	// 处理空字节切片（如空字符串）
+	if len(b) == 0 {
+		return nil
+	}
+
+	// 尝试解析 JSON
+	var temp SimpleFiles
+	if err := json.Unmarshal(b, &temp); err != nil {
+		// 解析失败时返回空切片（如无效 JSON）
+		return nil
+	}
+
+	*s = temp
+	return nil
+}
+
+type Module struct {
+	ID     uint         `gorm:"primarykey"`
+	Images *SimpleFiles `gorm:"type:json" json:"images"`
+}
 
 func main() {
-	fmt.Println("vim-go")
+
+	dbDSN := "root:root@tcp(192.168.56.4:3306)/micro?charset=utf8&parseTime=True&loc=Local"
+	db, err := gorm.Open(mysql.Open(dbDSN), &gorm.Config{})
+	if err != nil {
+		panic(err)
+	}
+	defer func() {
+		db, _ := db.DB()
+		db.Close()
+	}()
+	// insert into module (id,images) values (1,'[{"name":"1.jpg","url":"http://www.baidu.com"},{"name":"2.jpg","url":"http://www.baidu.com"}]')
+	// insert into module (id) values (2)
+	// insert into module (id) values (3, "")
+	lists := []*Module{}
+	db.Model(&Module{}).Find(&lists)
+
+	// 1, 内容正确,
+	// 2, images nil 不符合预期
+	// 3, images [] 符合预期
+	for _, item := range lists {
+		b, _ := json.Marshal(item.Images)
+		fmt.Printf("id: %d, images: %s\n", item.ID, string(b))
+		// 1, [{"name":"1.jpg","url":"http://www.baidu.com"},{"name":"2.jpg","url":"http://www.baidu.com"}]
+		// 2, null
+		// 3, []
+	}
 }