blob

Oracle 10g small Blob or Clob not being stored inline?

由 陌路散爱 提交于 2019-12-03 12:40:54
According to the documents I've read, the default storage for a CLOB or BLOB is inline, which means that if it is less than approx 4k in size then it will be held in the table. But when I test this on a dummy table in Oracle (10.2.0.1.0) the performance and response from Oracle Monitor (by Allround Automations) suggest that it is being held outwith the table. Here's my test scenario ... create table clobtest ( x int primary key, y clob, z varchar(100) ) ; insert into clobtest select object_id, object_name, object_name from all_objects where rownum < 10001 ; select COLUMN_NAME, IN_ROW from user

Oracle database: How to read a BLOB?

由 房东的猫 提交于 2019-12-03 12:17:07
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? andrewdotn 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 because you this is the same format used for inserting into BLOB columns: CREATE GLOBAL TEMPORARY

Blob video duration metadata [duplicate]

由 廉价感情. 提交于 2019-12-03 11:56:20
问题 This question already has answers here : How can I add predefined length to audio recorded from MediaRecorder in Chrome? (3 answers) Closed last year . I am writing a software that manipulates camera stream video in firefox. I am generating a Blob with video type recorded with MediaRecorder API . What i am doing to save the blob as video in local storage is using FileSaver library : FileSaver.saveAs(BlobVideo,"video.mp4"); It seems the video doesnt have any max duration, so i cannot navigate

How to check if a variable is a blob in JavaScript

由 一曲冷凌霜 提交于 2019-12-03 10:45:13
问题 As typeof returns "object".. var MyBlob = new Blob(['test text'], {type : 'text/plain'}); console.log(typeof MyBlob) // "object" is it too early to ask for a generic solution for checking whether or not a variable is a blob as it is not yet widely supported? Or how should I go about testing for blob type in browsers which already have it implemented? 回答1: You can test if it is an instanceof Blob like this: var MyBlob = new Blob(['test text'], {type : 'text/plain'}); console.log(MyBlob

What are the pros or cons of storing json as text vs blob in cassandra?

由 僤鯓⒐⒋嵵緔 提交于 2019-12-03 10:41:17
One problem with blob for me is, in java, ByteBuffer (which is mapped to blob in cassandra) is not Serializable hence does not work well with EJBs. Considering the json is fairly large what would be the better type for storing json in cassandra. Is it text or blob? Does the size of the json matter when deciding the blob vs json? If it were any other database like oracle, it's common to use blob/clob. But in Cassandra where each cell can hold as large as 2GB, does it matter? Please consider this question as the choose between text vs blob for this case, instead of sorting to suggestions

How to create a java.sql.Blob object in Java SE 1.5.0 with a byte[] input?

由 让人想犯罪 __ 提交于 2019-12-03 10:03:28
I want to create a Blob object from a byte[] input to update a table using PreparedStatement#setBlob() . In J2SE 6, we have java.sql.Connection#createBlob() to get this done. Is there anything similar to this available in J2SE 1.5.0? What is the best way to update a BLOB type column with a byte[] data in J2SE 1.5.0? An example, using SerialBlob : import java.sql.Blob; import javax.sql.rowset.serial.SerialBlob; byte[] byteArray = .....; Blob blob = new SerialBlob(byteArray); You don't have to worry about creating Blob objects at all. Treat them as blobs on the database, and byte[] s in Java.

Compressing a blob in javascript

由 走远了吗. 提交于 2019-12-03 09:44:53
问题 I need to send a blob to the server with ajax, but it can end up getting somewhat large, and I'd like to decrease upload time. I've tried jszip already, but that just gave me an empty file inside the zip. I've also tried btoa(), but it turns out that the encoded value just ends up being [object Blob] instead of the actual blob data. What are my options for compressing blobs? Here was the code I used for jszip: var zip = new JSZip(); zip.file("recording.wav", blobFile); var content = zip

How to get a File() or Blob() from an URL in javascript?

由 北战南征 提交于 2019-12-03 09:03:15
问题 I try to upload an image to the Firebase storage from an URL (with ref().put(file) )(www.example.com/img.jpg). To do so i need a File or Blob, but whenever I try new File(url) it says "not enough arguments“… EDIT: And I actually want to upload a whole directory of files, that’s why i can’t upload them via Console 回答1: Try using the fetch API. You can use it like so: fetch('https://upload.wikimedia.org/wikipedia/commons/7/77/Delete_key1.jpg') .then(res => res.blob()) // Gets the response and

ArrayBuffer vs Blob and XHR2

由 ◇◆丶佛笑我妖孽 提交于 2019-12-03 08:43:38
问题 XHR2 differences states The ability to transfer ArrayBuffer, Blob, File and FormData objects. What are the differences between ArrayBuffer and Blob ? Why should I care about being able to send them over XHR2 ? (I can understand value of File and FormData) 回答1: This is an effort to replace the old method which would take a "string" and cut sections of it out. You would use an ArrayBuffer when you need a typed array because you intend to work with the data, and a blob when you just need the

window.URL.createObjectURL(blob); is undefined in my application

由 匿名 (未验证) 提交于 2019-12-03 08:41:19
可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I'm facing this issue only in my application irrespective of browser (IE & Chrome). If I check window.URL.createObjectURL(blob) in console of any other page in both the browsers, its working fine. But it window.URL.createObjectURL(blob) is getting undefined only in the tab in which I open my application :( I'm not sure, which library is removing "createObjectURL" method. following are my scripts <script src="src/js/libs/jquery/dist/jquery.js"></script> <script src="src/js/libs/toastr/toastr.js"></script> <script src="src/js/libs/moment
订阅 blob