blob | 易学教程

Images in SimpleCursorAdapter

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问题 I'm trying to use a SimpleCursorAdapter with a ViewBinder to get an image from the database and put it into my ListView item view. Here is my code: private void setUpViews() { mNewsView = (ListView) findViewById(R.id.news_list); Cursor cursor = getNews(); SimpleCursorAdapter curAdapter = new SimpleCursorAdapter( getApplicationContext(), R.layout.cursor_item, cursor, new String[] { "title", "content", "image" }, new int[] { R.id.cursor_title, R.id.cursor_content, R.id.news_image }); ViewBinder

How can I insert large files in MySQL db using PHP?

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问题 I want to upload a large file of maximum size 10MB to my MySQL database. Using .htaccess I changed PHP's own file upload limit to "10485760" = 10MB. I am able to upload files up to 10MB without any problem. But I can not insert the file in the database if it is more that 1 MB in size. I am using file_get_contents to read all file data and pass it to the insert query as a string to be inserted into a LONGBLOB field. But files bigger than 1 MB are not added to the database, although I can use

Where is Blob binary data stored?

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问题 Given var data = new Array(1000000); for (var i = 0; i < data.length; i++) { data[i] = 1; } var blob = new Blob([data]); where is binary data representation of array stored? 回答1: All variables that are not explicitly represented in any other storage are stored in memory (RAM) and lives there till end of your program or while you unset it (clear it from memory). TLDR; In RAM 回答2: This will not answer your question fully. So what happens when a new Blob() is declared? From official fileAPI

sqlite3 insert and read BLOB data in database

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问题 I need to read and write BLOB data to a database. Here is my structure table #define CREATE_TABLE_USERS_SQL "CREATE TABLE IF NOT EXISTS %@ ( \ UserID INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL, \ Name VARCHAR(50), \ Image BLOB);" How can I insert it into database, and then retrieve from it? Environment: iPhone SDK 4.1 SQLite3 database. This code fails: NSData * buf2 = [[NSData alloc] init]; sqlite3_column_blob(statement, 5); buf2 = sqlite3_column_bytes(statement, 5); user.image = [UIImage

How to insert / retrieve a file stored as a BLOB in a MySQL db using python

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问题 I want to write a python script that populates a database with some information. One of the columns in my table is a BLOB that I would like to save a file to for each entry. How can I read the file (binary) and insert it into the DB using python? Likewise, how can I retrieve it and write that file back to some arbitrary location on the hard drive? 回答1: thedata = open('thefile', 'rb').read() sql = "INSERT INTO sometable (theblobcolumn) VALUES (%s)" cursor.execute(sql, (thedata,)) That code of

Tensorflow版Faster RCNN源码解析（TFFRCNN）（11） gt_data_layer/minibatch.py

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本blog为github上 CharlesShang/TFFRCNN 版源码解析系列代码笔记 --------------- 个人学习笔记 --------------- ---------------- 本文作者吴疆 -------------- ------ 点击此处链接至博客园原文 ------ 与roi_data_layer/minibatch.py类似，该函数可能并未执行 """Compute minibatch blobs for training a Fast R-CNN network.""" 1.get_minibatch(roidb, num_classes) 更新roidb[i]'info_boxes'字段（未知内容，18是什么意思）、增加'data'（图像数据blob）和'parameters'字段（相关参数，含num_scale 图像缩放尺度数量、num_aspect 使用纵横比数量、cfg.TRAIN.SCALES、 cfg.TRAIN.SCALE_MAPPING、cfg.TRAIN.ASPECT_HEIGHTS、cfg.TRAIN.ASPECT_WIDTHS ，后面3个值均无应该会报错，也有可能该函数并未执行），未见调用 # 更新roidb[i]'info_boxes'字段、增加'data'和'parameters'字段 def get

Storing Documents as Blobs in a Database - Any disadvantages?

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The requirements for my document management system were: Must be secure from theft by simple copying of directories, files etc. Must be secure against traditional virus infection (infection of physical file) Must be fast to retrieve The repository must not be visible to casual (directory) browsing users etc. I have decided to store all documents (and scanned images) as blobs in the database and so far my experience is wonderful and document retrieval is blindingly fast as well - it meets all the criteria from above and there are even a couple of additional advantages, such as autostoring

MySQL Binary Storage using BLOB VS OS File System: large files, large quantities, large problems

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问题 Versions I am running (basically latest of everything): PHP: 5.3.1 MySQL: 5.1.41 Apache: 2.2.14 OS: CentOS (latest) Here is the situation. I have thousands of very important documents, ranging from customer contracts to voice signatures (recordings of customer authorisation for contracts), with file types including, but not limited to jpg, gif, png, tiff, doc, docx, xls, wav, mp3, pdf, etc. All of these documents are currently stored on several servers including Windows 32 bit, CentOS and Mac

Cursor size limit in Android SQLiteDatabase

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I download a db from internet. I save it in my datases folder and I open it. Inside the db there is a table "Ads" with 6 fields. 2 of these fields are BLOB. When I want to read from this table... I have some problem... I noticed that when I read a row with a blob field more bigger than 1 mega byte, this causes an exception... "get field slot from row 0 col 0 failed". if it's a little blob, all is ok... thanks in advance :) There's a limit of 1MB on internal assets due to dynamic decompression; the 1MB limit also seems to apply to Cursor blobs but this doesn't seem to be documented anywhere.

HTML5 / Javascript - DataURL to Blob & Blob to DataURL

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问题 I have a DataURL from a canvas that shows my webcam. I turn this dataURL into a blob using Matt's answer from here: How to convert dataURL to file object in javascript? How do I convert this blob back into the same DataURL? I've spent a day researching this and I'm astouned this isn't documented better, unless I'm blind. EDIT: There is var urlCreator = window.URL || window.webkitURL; var imageUrl = urlCreator.createObjectURL(blob); but it only returns a really short URL that seems to point at