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View Full Version : هش کردن عکسها و ذخیره آن در دیتابیس



kamalhamidi
شنبه 26 شهریور 1390, 15:06 عصر
سلام

من امروز متوجه شدم که گوگل توی یکی از سرویس هاش برای نمایش عکسها از روش هش کردن استفاده میکنه!

یعنی عکسها رو با base64_encode هش میکنه و در دیتابیس ذخیره میکنه!

حالا میخوام ببینم که آیا هش کردن عکس و ذخیره آن در دیتابیس برای سایت من که مثل یه گالری هست کار عاقلانه ای هست!؟

اینم کد یکی از عکسهای هش شده به وسله گوگل:


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A B C D
شنبه 26 شهریور 1390, 19:44 عصر
عکس هش نمیشه. هش کردن یه اصطلاحی هست که در موارد دیگری کاربرد داره.
base64 یه روش و فرمت برای تبدیل دیتای باینری به دیتای ASCII (متنی) است.
ضمنا از کجا میدونی این رو در دیتابیس ذخیره میکنه؟ شاید On the fly تولید کرده. حتما توی src تگ img پیداش کردی.


حالا میخوام ببینم که آیا هش کردن عکس و ذخیره آن در دیتابیس برای سایت من که مثل یه گالری هست کار عاقلانه ای هست!؟ این کار معمولا برای تصاویر کم حجم انجام میشه. چون بعضی مرورگرها در این زمینه محدودیت حجمی دارن.
به این روش میان دیتای تصاویر کوچک رو در خود صفحه درج میکنن تا نیازی نباشه برای هرکدام یک درخواست به سرور ارسال بشه، و کاهش تعداد درخواست ها باعث افزایش سرعت میشه.
فکر نمیکنم برای گالری کاربرد خاصی داشته باشه. مگر اینکه نسخه های Thumbnail رو به این صورت در صفحه درج کنی.

armsoftpc
شنبه 26 شهریور 1390, 22:43 عصر
به نام خدا
با سلام
به شدت از ذخیره عکس ها در پایگاه داده خودداری کنید ، چون این کار باعث کاهش کارایی پایگاه داده میشود و اجرای دستورات را طولانی می کند و علاوه بر این ها پایگاه داده را سنگین می سازد.:متعجب:
به همین دلیل من به شما پیشنهاد میدم که عکس ها توی همون فایل باشه خیلی بهتره! این حرف من نیست ، حرف خود سازنده های Mysql! و فقط تنها کاری که با پایگاه داده دارید اینه که نام و پسوند عکس رو در پایگاه داده ذخیره می کنید.
موفق باشید.