blob

今天用java读取oracle里的Clob字段。本来要转成xml文件的，一顿转换。现在总结一下这个流的互相转换方法。 以下内容来自： http://hi.baidu.com/webidea/item/8965fd99de1034dd1e4271e1 一、byte[]=>Blob 我们可以通过Hibernate提供的表态方法来实现如： org.hibernate.Hibernate.Hibernate.createBlob(new byte[1024]); 二、Blob=>byte[] /** * 把Blob类型转换为byte数组类型 * @param blob * @return */ private byte[] blobToBytes(Blob blob) { BufferedInputStream is = null; try { is = new BufferedInputStream(blob.getBinaryStream()); byte[] bytes = new byte[(int) blob.length()]; int len = bytes.length; int offset = 0; int read = 0; while (offset < len && (read = is.read(bytes, offset, len offset)) >= 0)

I'm getting the same results from select length(column_name) from table as select dbms_lob.getlength(column_name) from table However, the answers to this question seem to favor using dbms_lob.getlength() . Is there any benefit to using dbms_lob.getlength() ? If it changes the answer, I know all of the blobs are .bmp images (never worked with blobs before). length and dbms_lob.getlength return the number of characters when applied to a CLOB (Character LOB). When applied to a BLOB (Binary LOB), dbms_lob.getlength will return the number of bytes, which may differ from the number of characters in

I am having trouble setting the type of a String, it goes like public void setTextDesc(String textDesc) { this.textDesc = textDesc; } @Column(name="DESC") @Lob public String getTextDesc() { return textDesc; } and it didn't work, I checked the mysql schema and it remains varchar(255), I also tried, @Column(name="DESC", length="9000") or @Column(name="DESC") @Type(type="text") I am trying to make the type to be TEXT, any idea would be well appreciated! You said "I checked the mysql schema and it remains varchar(255)" - did you expect Hibernate to automatically alter your database? It won't. Even

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首先是HTML5的几个规范 File FileReader ArrayBuffer Blob input上传的文件就是File类型文件，而File是基于Blob设计的。 接口自带slice方法，可以分割文件，达到分片上传的目的。 FileReader可以读取Blob里面的内容。 //将字符串转换成 Blob对象 var blob = new Blob(['中文字符串'], { type: 'text/plain' }); //将Blob 对象转换成字符串 var reader = new FileReader(); reader.readAsText(blob, 'utf-8'); reader.onload = function (e) { console.info(reader.result); } 使用方法如上，把上传文件接口类型设定为multipart/form-data，然后上传经过slice分片的文件。 node里可以用中间件解析文件，比如formidable、multer const formidable = require('formidable'); app.use(formidable ( { encoding: 'utf-8', multiples: true, // req.files to be arrays of files } ));

Here is the code to retrieve image in action class. I have tried it, but not able to display it I don't know about the image processing. How should I use tags in JSP to display the image? public String displayImage() { Connection con = null; PreparedStatement preparedStatement = null; ResultSet resultSet = null; String sql,result=""; con=JdbcHelper.getConnection(); if(con!=null) { try { sql = "SELECT INPUT_FILE_BLOB FROM message_details where message_id=?"; preparedStatement = con.prepareStatement(sql); preparedStatement.setString(1, messageid); resultSet = preparedStatement.executeQuery(); if

Just to first clarify, I know there are better ways to do this, but I'm determined to experiment. Basically, I'm trying to grab an image from a form post, then send that into a database MEDIUMBLOB field. Unfortunately, using my current method, the end result in the database column is always zero bytes. phpMyAdmin Screenshot Here is the code for the image upload on the form: input type="file" name="_imagePost"> Here is the PHP code on the page, I'm using MySQLi : if(isset($_POST['_imagePost'])) { $_useImagePost = 1; $_imagePost = file_get_contents($_FILES['_imagePost']); // Open DB Connection $

I'm building an e-commerce website with cakephp3.7, and for sellers to post their products they need to upload the image of the article to sell, and that through a form with a Blob column. The images are being uploaded well from the view, but in the database the real name of the image does not appear, instead of that, in that place the name that appears for all the images is 'Blob' for all the articles. The problem is now that when I try to retrieve the article's image (which is only knowledgeable by it's name) from the database to the controller in order to send it to the frontend of the