blob

问题 What is the best way to store messaging texts in large/big web sites: BLOB or ordinary text in table or something else? Database: MySQL. 回答1: There are a lot of questions you need to ask yourself when making that decision. There's a very detailed article, To BLOB or not to BLOB, that is the question: Whether to store string in BLOB, or CHAR, or VARCHAR?, that talks about some of the things to consider. 回答2: If by "messages" you mean something like SMS or IRC, stuff with a defined limit then I

问题 I'm working on a testing framework that needs to pass files to the drop listener of a PLUpload instance. I need to create blob objects to pass inside a Data Transfer Object of the sort generated on a Drag / Drop event. I have it working fine for text files and image files. I would like to add support for PDF's, but it seems that I can't get the encoding right after retrieving the response. The response is coming back as text because I'm using Sahi to retrieve it in order to avoid Cross-Domain

问题 This is my first question. I am having users upload their own image to a database. That image is stored as a BLOB. I was able to do this successfully. I am using MySQL for the database. The part I am having trouble with is displaying that BLOB as an image on the website when its called upon. Right now only the Binary data, lots of weird symbols are being displayed. I think its a problem with the HTTP header. Right now its in : print "Content-Type: text/html" I've tried: print "Content-Type:

问题 I'm attempting to create a .wav file from a blob of data in Node JS, using fs.writeFile() . Firstly, is this even possible? I'm currently trying with this... fs.writeFile(filename + '.wav', blob.recording, function (err) { // On completing writeFile, transfer file via scp var options = {...}; var target_path = "the/path" if (err) return logger.error(err); else{ scp2.scp(options, target_path, function (err) { // scp2 callback: always gets here }); } }); The scp of the written file "completes"

问题 I need to append data to my BLOB field, how can I do this using an UPDATE command? What i am asking is; is it possible to concatenate blob data so that i can eventually set it to a field like UPDATE BLOB_table SET BLOB_field = BLOB_field + BLOB_data I tried using DBMS_LOB.APPEND but it does not return a value; so i created a function which gives me an error of "invalid LOB locator specified" CREATE OR REPLACE FUNCTION MAKESS.CONCAT_BLOB(A in BLOB,B in BLOB) RETURN BLOB IS C BLOB; BEGIN DBMS

问题 I'm working on an application to do some batch processing, and want to store the input and output data as files in BLOB fields in an Oracle database. The Oracle version is 10g r2. Using the PreparedStatement.setBinaryStream() method as below will insert a small text file into the database, but I'm not having any luck with a larger image file. Am I doing something wrong? Is this possible to do with JDBC? Will I need to bother the DBA? Thanks for your help. EDIT: The issue has been resolved. I

问题 I'm working with an Oracle database, and I would like to read the contents of a BLOB. How do I do this? When I do a simple select statement, it merely returns "(BLOB)" (without the quotes). How do I read the actual contents? 回答1: You can dump the value in hex using UTL_RAW.CAST_TO_RAW(UTL_RAW.CAST_TO_VARCHAR2()) . SELECT b FROM foo; -- (BLOB) SELECT UTL_RAW.CAST_TO_RAW(UTL_RAW.CAST_TO_VARCHAR2(b)) FROM foo; -- 1F8B080087CDC1520003F348CDC9C9D75128CF2FCA49D1E30200D7BBCDFC0E000000 This is handy

问题 How can I search in (put condition on) blob field in oracle, like text fields? I need someting like: select * from table_name where blob_field like '%00ff00ff%' Oracle throws some error on it. 回答1: You can use dbms_lob.instr for this purpose i.e. select * from table_name where dbms_lob.instr(blob_field, utl_raw.CAST_TO_RAW('00ff00ff'), 1, 1) > 0 来源： https://stackoverflow.com/questions/4577986/conditions-like-like-on-binary-field-blob-in-oracle

问题 I wish to have my Python script download the Master data (Download, XLSX) Excel file from this Frankfurt stock exchange webpage. When to retrieve it with urrlib and wget , it turns out that the URL leads to a Blob and the file downloaded is only 289 bytes and unreadable. http://www.xetra.com/blob/1193366/b2f210876702b8e08e40b8ecb769a02e/data/All-tradable-ETFs-ETCs-and-ETNs.xlsx I'm entirely unfamiliar with Blobs and have these questions: Can the file "behind the Blob" be successfully

问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 5 years ago . How do i display an image stored in mySQL database as BLOB ? What it tried so far: 1. Created a new php function/file to get picture (getpicture.php). 2. In the html, I have the following code: <img src="getpicture.php?id=2" border ="0" height="250" width="250" /> /*below is the getpicture.php*/ <?php @ $db =