blob

Binary version of StringReplace

不打扰是莪最后的温柔 提交于 2019-12-21 05:28:11
问题 I'm trying to run AnsiStrings.StringReplace on a RawByteString holding a blob of data, some of which needs to be replaced. It would work, except that inside StringReplace it converts my string to a PAnsiChar, and so the search ends up bailing out as soon as it hits the first #0 byte inside the blob. I'm looking for a routine that works just like StringReplace, but is safe to use on blobs that may contain null bytes. Does anyone know of one? 回答1: I'd guess the "Offending" function in

Oracle Blob as img src in PHP page

纵然是瞬间 提交于 2019-12-21 05:09:13
问题 I have a site that currently uses images on a file server. The images appear on a page where the user can drag and drop each as is needed. This is done with jQuery and the images are enclosed in a list. Each image is pretty standard: <img src='//network_path/image.png' height='80px'> Now however I need to reference images stored as a BLOB in an Oracle database (no choice on this, so not a merit discussion). I have no problem retrieving the BLOB and displaying on it's own using: $sql = "SELECT

BLOB vs FileSystem

独自空忆成欢 提交于 2019-12-21 05:05:20
问题 Although this question has been appear in past previous post, but different scenario and different consideration decide which one is the best. I need to implement a system whereby it can handle 200GB - 400GB size of images yearly(approximately < 1mb per image). It is P&C images which only allowed for authorised personal to access and VIEW only. I am planning to use an application based of system to INSERT to MYSQL database and using PHP web based application for VIEW only. I am thinking to

Html5 学习系列(四)文件操作API

烈酒焚心 提交于 2019-12-21 04:54:26
引言 在之前我们操作本地文件都是使用flash、silverlight或者第三方的activeX插件等技术,由于使用了这些技术后就很难进行跨平台、或者跨浏览器、跨设备等情况下实现统一的表现,从另外一个角度来说就是让我们的web应用依赖了第三方的插件,而不是很独立,不够通用。在HTML5标准中,默认提供了操作文件的API让这一切直接标准化。有了操作文件的API,让我们的Web应用可以很轻松的通过JS来控制文件的读取、写入、文件夹、文件等一系列的操作,让Web应用不再那么蹩脚,而之前Web应用如果不借助第三方插件,那就是个shit!但是最新的标准中大部分浏览器都已经实现了文件的读取API,文件的写入,文件和文件夹的最新的标准刚制定完毕,相信后面随着浏览器的升级这些功能肯定会实现的非常好,接下来我主要给大家介绍文件读取的几个API。 几个重要的JS对象 1):FileList对象 它是File对象的一个集合,在Html4标准中文件上传控件只接受一个文件,而在新标准中,只需要设置multiple,就支持多文件上传,所以从此标签中获取的files属性就是FileList对象实例。demo:<input type="file" multiple="multiple" name="fileDemo" id="fileDemo" /> ;下面是关于FileList对象的API的原型:

Store image files or URLs in MySQL database? Which is better? [duplicate]

▼魔方 西西 提交于 2019-12-21 04:51:38
问题 This question already has answers here : Closed 8 years ago . Possible Duplicate: Storing Images in DB - Yea or Nay? Images in database vs file system I've been developing a web application using RIA technologies (Flex + PHP + MySQL + Ajax) and now I'm in a dilemma about image files. I use some images in my Flex app, so I think "it could be awesome if I store them into database, and then retrieve from it; consecuently, maintain process should be more easy". But, here is my dilemma: Should I

How do I edit BLOBs (containing JSON) in Oracle SQL Developer?

让人想犯罪 __ 提交于 2019-12-21 04:24:12
问题 How do I edit BLOBs (containing JSON text) in Oracle SQL Developer? I can open and view them, but do I need an external editor to edit them? Any help on what to use, even if just notepad, and how to go about it would be greatly appreciated in the answer. EDIT: BLOBs in question contain JSON text. 回答1: If you run a query in SQL Developer 3.1 (and probably earlier releases) that returns a BLOB, you can double-click on the particular BLOB you're interested in where you'll be prompted either to

vue下载文件

拟墨画扇 提交于 2019-12-21 03:33:32
原文: https://www.cnblogs.com/zhang-can/p/9116159.html vue下载文件 download(){ let self = this; let url = self.$store.state.path + "tools/download_file"; let data = JSON.stringify({ user: self.$store.state.username, file_name: self.plist_file_name }); console.log("data:", data) self.$axios( { method: "post", url: url, data: data, responseType: "blob", // 指定获取数据的类型为blob } ).then( function (response) { data = response.data;       // 创建a标签并点击, 即触发下载 let url = window.URL.createObjectURL(new Blob([data])); let link = document.createElement("a"); link.style.display = "none"; link.href = url; link

React Native Image Upload via aws Amplify using Storage class

戏子无情 提交于 2019-12-21 02:13:22
问题 I have an image. I want to upload it to S3 using aws-amplify. All the Storage class upload examples are using text documents; however, I would like to upload an image. I am using expo which does not have support from react-native-fetch-blob, and react native does not have blob support... yet. So my options seem to be: Create a node service via lambda. Upload only the base64 info to S3 and not a blob. const { status } = await Permissions.askAsync(Permissions.CAMERA_ROLL); if (status ===

Node.JS reading BLOB from mysql

北城余情 提交于 2019-12-20 19:48:09
问题 I'm using the Node.JS node-mysql module. One column has a BLOB type and want to read from it and if possible base64 encode it. I haven't been able to find anything on how to do this. Any ideas? 回答1: Try the following snippet: var buffer = new Buffer( blob ); var bufferBase64 = buffer.toString('base64'); If your blob is binary, use the following instead: var buffer = new Buffer( blob, 'binary' ); var bufferBase64 = buffer.toString('base64'); You can also simplify that to one line: var

Varbinary vs Blob in MySQL

拈花ヽ惹草 提交于 2019-12-20 17:00:31
问题 I have about 2k of raw binary data that I need to store in a table, but don't know whether to choose the Varbinary or Blob type. I have read through the descriptions in the MySQL docs but didn't find any contract and compare descriptions. I also read that varbinary only supports up to 255 characters, but I successfully created a varbinary(2048) field, so I'm a bit confused. The binary data does not need to be indexed, nor will I need to query on it. Is there an advantage to using one type