blob

Php : Convert a blob into an image file

由 不打扰是莪最后的温柔 提交于 2019-11-27 02:06:11
Is this possible with php and a mysql database to Convert a blob into an image file? If the BLOB contains the binary data of an image (in a recognizable format like e.g. tiff, png, jpeg, etc), take the content of the BLOB, write it to a file, and voilà... you got an image. On some strange operation systems you have to give the output file a correspondig extension, so that the image file can be recognised as such. You can use a few different methods depending on what php image library you have installed. Here's a few examples. Note, the echo <img> is just a trick I use to display multiple

How is a blob column annotated in Hibernate?

由 你离开我真会死。 提交于 2019-11-27 02:03:44
问题 How is a blob column annotated in Hibernate? So far I have a class that has: @Column( name = "FILEIMAGE" ) private byte[ ] fileimage ; // public byte[ ] getFileimage ( ) { return this.fileimage ; } public void setFilename ( String filename ) { this.filename = filename ; } 回答1: @Lob should do the trick for blob and clob (use String as type) @Column( name = "FILEIMAGE" ) @Lob(type = LobType.BLOB) private byte[] fileimage; 回答2: I used hibernate 4 in JBoss 7 and Java 7, and found out the BLOB

Can I set the filename of a PDF object displayed in Chrome?

由 南笙酒味 提交于 2019-11-27 02:01:34
In my Vue app I receive a PDF as a blob, and want to display it using the browser's PDF viewer. I convert it to a file, and generate an object url: const blobFile = new File([blob], `my-file-name.pdf`, { type: 'application/pdf' }) this.invoiceUrl = window.URL.createObjectURL(blobFile) Then I display it by setting that URL as the data attribute of an object element. <object :data="invoiceUrl" type="application/pdf" width="100%" style="height: 100vh;"> </object> The browser then displays the PDF using the PDF viewer. However, in Chrome, the file name that I provide (here, my-file-name.pdf) is

Storing images on a database [duplicate]

由 一世执手 提交于 2019-11-27 01:41:26
问题 This question already has answers here : Closed 6 years ago . Possible Duplicate: Storing Images in DB - Yea or Nay? For ages I've been told not to store images on the database, or any big BLOB for that matter. While I can understand why the databases aren't/weren't efficient for that I never understood why they couldn't. If I can put a file somewhere and reference it, why couldn't the database engine do the same. I'm glad Damien Katz mentioned it on a recent Stack Overflow podcast and Joel

Retrieve large blob from Android sqlite database

由 喜你入骨 提交于 2019-11-27 01:35:34
I stored chunks of binary data (protobufs) in the sqlite database of an Android app without realizing that Android's Cursor can only hold a maximum of 1MB of data. I now know that I should have stored these binary blobs in files and only referenced the files in the sqlite database entries. I need to upgrade the database (the app has been in use for a while) in order to move these binary chunks to files. The problem is that some user's data may have already exceeded the 1MB limit and I'm not able to retrieve it from the database (accessing the resulting Cursor for a single row that contains a

How to convert Blob to String and String to Blob in java

由 ε祈祈猫儿з 提交于 2019-11-27 01:33:48
问题 I'm trying to get string from BLOB datatype by using Blob blob = rs.getBlob(cloumnName[i]); byte[] bdata = blob.getBytes(1, (int) blob.length()); String s = new String(bdata); It is working fine but when I'm going to convert String to Blob and trying to insert into database then nothing inserting into database. I've used below code for converting String to Blob: String value = (s); byte[] buff = value.getBytes(); Blob blob = new SerialBlob(buff); Can anyone help me about to converting of Blob

数字币开发相关

由 本秂侑毒 提交于 2019-11-27 01:33:02
1.安装bitcoin core 2.打开bitcoin core时，会提示设置存储目录 如：d:\mybtc\data 3.在d:\mybtc\data下面，创建一个bitcoin.conf文件，内容如下（配置为测试环境）： rpcallowip=::/0表示允许所有ip访问rpc server=1 testnet=1 rpcuser=123456 rpcpassword=abcdef rpcallowip=127.0.0.1 rpcport=10002 txindex=1 BTC测试币领取地址： https://coinfaucet.eu/en/btc-testnet/ BTC测试区块查询地址：https://www.blocktrail.com/BTC ETH（ropsten）测试币领取地址：http://faucet.ropsten.be:3001/ ETH（ropsten）测试区块查询地址：https://ropsten.etherscan.io/ btc json-rpc api : https://en.bitcoin.it/wiki/Original_Bitcoin_client/API_calls_list#Full_list omni-usdt json-rpc api: https://github.com/OmniLayer/omnicore/blob

Blob extraction in OpenCV

由 纵饮孤独 提交于 2019-11-27 01:23:33
问题 I'm using OpenCV to filter an image for certain colours, so I've got a binary image of the detected regions. Now I want to erode those areas and then get rid of the smaller ones, and find the x,y coordinates of the largest 'blob' I was looking for recommendations as to what the best library would be to use? I've seen cvBlob and cvBlobsLib but I'm not too sure how to set them up. Do I want to compile them along with the project or do I want to compile and install them to the system (like I did

oracle blob text search

由 空扰寡人 提交于 2019-11-27 01:07:57
问题 Is it possible to search through blob text using sql statement? I can do select * from $table where f1 like '%foo%' if the f1 is varchar, how about f1 is a blob? Any counter part for this? 回答1: This is quite possible and easy to do. Simply use dbms_lob.instr in conjunction with utl_raw.cast_to_raw So in your case, if t1 is a BLOB the select would look like: select * from table1 where dbms_lob.instr (t1, -- the blob utl_raw.cast_to_raw ('foo'), -- the search string cast to raw 1, -- where to

Spring, Hibernate, Blob lazy loading

由 感情迁移 提交于 2019-11-27 01:01:07
I need help with lazy blob loading in Hibernate. I have in my web application these servers and frameworks: MySQL, Tomcat, Spring and Hibernate. The part of database config. <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource" destroy-method="close"> <property name="user" value="${jdbc.username}"/> <property name="password" value="${jdbc.password}"/> <property name="driverClass" value="${jdbc.driverClassName}"/> <property name="jdbcUrl" value="${jdbc.url}"/> <property name="initialPoolSize"> <value>${jdbc.initialPoolSize}</value> </property> <property name="minPoolSize">
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