BUG修复，返回结构统一

server/config/config.go

@@ -0,0 +1,47 @@
+package config
+
+import (
+	"database/sql"
+	"fmt"
+	"log"
+	"os"
+
+	_ "github.com/go-sql-driver/mysql"
+)
+
+var DB *sql.DB
+
+// JWTSecret is the secret key used for signing JWT tokens
+var JWTSecret = "your-secret-key-change-this-in-production" // Default value
+
+func InitDB() {
+	var err error
+
+	// Try to get DSN from environment variable, otherwise use default
+	dsn := os.Getenv("DB_DSN")
+	if dsn == "" {
+		dsn = "root:root@tcp(127.0.0.1:3306)/nl_blog?charset=utf8mb4&parseTime=True&loc=Local"
+	}
+
+	// Try to get JWT secret from environment variable
+	if secret := os.Getenv("JWT_SECRET"); secret != "" {
+		JWTSecret = secret
+	}
+
+	DB, err = sql.Open("mysql", dsn)
+	if err != nil {
+		log.Fatal("Failed to connect to database:", err)
+	}
+
+	if err = DB.Ping(); err != nil {
+		log.Fatal("Failed to ping database:", err)
+	}
+
+	fmt.Println("Database connected successfully")
+}
+
+func CloseDB() {
+	if DB != nil {
+		DB.Close()
+	}
+}