blob

Read Oracle BLOB field

由 会有一股神秘感。 提交于 2019-12-07 07:07:08
问题 I try to read an Oracle BLOB field and show the content i a richTextBox. The examples i find with google are almost the same but still i can't get it to work. I know that the BLOB field contains serialized data. This is what i have so far: (the connecetion en reader work fine) private void button1_Click_1(object sender, EventArgs e) { //testen of een blob is uit te lezen OracleCommand cmd = new OracleCommand(); cmd.Connection = OraConnection.conn; cmd.CommandText = "select id, blobfield from

Blob Error with Active Storage Rails 5.2

由 谁说胖子不能爱 提交于 2019-12-07 06:56:43
问题 I've just upgraded a 5.1.4. app to 5.2 and am trying to swap out Paperclip for ActiveStorage. At the moment when trying to update an existing record with an image, I get the following error: Unable to autoload constant ActiveStorage::Blob::Analyzable, expected /Users/Simon/.rvm/gems/ruby-2.4.0/gems/activestorage-5.2.0/app/models/active_storage/blob/analyzable.rb to define it In my model: has_one_attached :pic In my controller: ... def update respond_to do |format| if @gin.update(gin_params)

Cordova SQLite save BLOB

由 拥有回忆 提交于 2019-12-07 04:49:36
问题 I have a problem with Cordova SQLite plugin. How can I save BLOB image to SQLite? I have BLOB object in JS: Blob:{ size: 96874 type: "image/jpeg" __proto__: Blob length: 1} And I trying to save it INSERT INTO images (img) VALUES (?); And when i trying to get this image: SELECT img FROM images I get this string: img: "{"type":"image\/jpeg","size":96874}" How can i convert it to BLOB again? Also i trying to save images in base64, but i can't save big images to SQLite, because base64 string is

Sending a PDF created dynamically as an attachment using PDFKit in a nodejs application

由 試著忘記壹切 提交于 2019-12-07 04:02:28
I am trying to create a pdf dynamically using PDFkit and want to send it as an attachment in a email. Following this http://pdfkit.org/demo/browser.html example and this https://nodemailer.com/using-attachments/ documentation I wrote the following code: var doc = new PDFDocument(); var stream = doc.pipe(blobStream()); doc.text("Howdy!!"); doc.on('end'); stream.on('finish', function() { var htmlMailBody ='Hi' var textMailBody = 'hi'; var mailOptions = { from: 'ASD', // sender address to: 'ecell@sfitengg.org', // list of receivers subject: 'Invitation ', // Subject line text: textMailBody, //

Insert BLOB using java for both DB2 and Oracle

由 試著忘記壹切 提交于 2019-12-07 03:10:32
问题 I am currently validating an application developed on Oracle for DB2. Since we don't want to maintain two separate sources, I need some query to insert blob into a field, that works in both oracle and db2. I don't have any identifier to distinguish under which DB the application is running. I used utl_raw.cast_to_raw in oracle and CAST() as BLOB in DB2 which are mutually incompatible. 回答1: You won't be able to find a common SQL that uses some kind of casting. But you can do this with "plain"

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

由 时光总嘲笑我的痴心妄想 提交于 2019-12-07 02:50:28
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

MediaRecorder - How to play chunk/blob of video while recording?

由 丶灬走出姿态 提交于 2019-12-07 02:17:05
问题 I currently have a MediaStream which is being recorded using MediaRecorder . At the end of the recording after recorder.stop() , it produce a Blob and I am able to play that video back. My goal is to play not the entire video at the end, but play a chunk while recording . For the moment, a chunk is not playable while recording is not ended. How can i do that using javascript? The final objective is to send a chunk by websocket that is playable even if recording is in action. I am not able to

convert oracle blob to xml type

由 冷暖自知 提交于 2019-12-07 00:31:46
问题 I have experience using MSSQL 2008 and I recently had to move from MSSQL to Oracle 10g. The people who designed the (Oracle) table, which has a column I need to extract data from, used a BLOB type column for the XML they need to store. In MSSQL you would have simply stored your XML string in an XML type or used a VARCHAR(MAX) . Assume a table myTable with a column called myColumn which is a VARCHAR(MAX) containing <ROOT><a>111</a></ROOT> If you wanted to convert the VARCHAR(MAX) type to an

Hibernate - How to set sql-type by annotation?

由 ∥☆過路亽．° 提交于 2019-12-07 00:07:39
问题 I have a file as a byte[] fileContent. My mySql-scheme is generated by Hibernate and by default hibernate sets the sql-type of fileContent to BLOB. But a BLOB is not big enough for my files. I will need at least a MEDIUMBLOM or even a LONGBLOB. But how can i annotate my field so that Hibernate will generate the scheme with my field as a LONGBLOB? I have search google for 2 hours now without getting anything... Shouldn't this be a so simple and common task that it should be documented

MySQL优化-2-数据库对象

由 拈花ヽ惹草 提交于 2019-12-06 22:29:58
优化表的数据类型 - PROCEDURE ANALYSE() 表需要使用何种数据类型，是需要根据应用来判断的。虽然应用设计的时候需要考虑字段的长度留有一定的冗余，但是不推荐让很多字段都留有大量的冗余，这样即浪费存储也浪费内存。我们可以使用PROCEDURE ANALYSE()对当前已有应用的表类型的判断，该函数可以对数据表中的列的数据类型提出优化建议，可以根据应用的实际情况酌情考虑是否实施优化。 语法： SELECT * FROM tbl_name PROCEDURE ANALYSE(); SELECT * FROM tbl_name PROCEDURE ANALYSE(16,256); 输出的每一列信息都会对数据表中的列的数据类型提出优化建议。第二个例子告诉PROCEDURE ANALYSE()不要为那些包含的值多于16 个或者256 字节的ENUM 类型提出建议。如果没有这样的限制，输出信息可能很长；ENUM 定义通常很难阅读。 在对字段类型进行优化时，可以根据统计信息并结合应用的实际情况对其进行优化。 通过拆分提高表的访问效率： 这里我们所说的拆分，主要是针对Myisam 类型的表，拆分的方法可以分成两种情况： 1. 纵向拆分： 纵向拆分是只按照应用访问的频度，将表中经常访问的字段和不经常访问的字段拆分成两个表，经常访问的字段尽量是定长的
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