blob

问题 [ 1 ], [ 2 ] and many other references gives conclusion that BLOBs with size less tha 0.3-1 MB should be stored in database while BLOBs larger than 1 MB - in file system (possibly through FILESTREAM). FACEBOOK.com stores 6.5 (30 with thumbnails and size versions) billions pictures in files system [ 3 ]. Randal's white paper [ 2 ] reasons it by: Well, this does not convince me about necessity to store blobs in database but just about the fact that they should not be accessed/streamed

问题 I have a MYSQL database with a column named img of BLOB type. When I insert a value into that column like this : LOAD_FILE('C:/Documents and Settings/All Users/Documents/My Pictures/Sample Pictures/Sunset.jpg') it works ! But like this : LOAD_FILE('C:/Documents and Settings/Administrator/My Documents/My Pictures/picture.jpg') it doesn't work and it tells me that the column img cannot be null ! And in both cases the file exists, and I'm connecting to the database as the root user (all

问题 I successful store image in database BLOB format. DataType for image in webservices model class is byte []. My web services: @POST @Consumes("application/json") @Produces("application/json") @Path("login") public Korisnici Login(Korisnici k) { Korisnici exception = new Korisnici(); ............ Json webservice example: [ { "id": 2, "ime": "haris", "mjestoGoogleMaps": null, "password": "1234", "username": "haris", "image": "iVBORw0KGgoAAAANSUhEUgAizDMizDMizDMizDMizDMizDMizDMizDMizDMizDMiz/JPL

问题 While writing a utility script to insert images into a database I wondered if there were a groovier way of doing it. In the end settled for something along the lines of this: def sql = Sql.newInstance(...) // ... Connection conn = sql.getConnection() PreparedStatement stmt.prepareStatment(...) stmt.setBinary(...) stmt.executeUpate() There must be a groovier way, can someone enlighten me? 回答1: A "Groovier" way could be just storing the path were you'd store the images. Storing the images in a

问题 I got an Oracle table with a number of columns. 1 of these columns in a BLOB datatype. I got a simple query in VB.NET that is retrieving all data from this table, and populates my form. However, I'm having some problems with the BLOB column. I have this bit of code : cmd.CommandText = "select * from local_it.local_email_template where name = '" & cb_EmailName.Text & "'" dr = cmd.ExecuteReader dr.Read() tb_Username.Text = dr.Item(1) tb_Password.Text = dr.Item(2) tb_FromName.Text = dr.Item(3)

问题 Here is my code: <Image source={BlobImage} style={{ height: 200, width: null, flex: 1 }} /> Where BlobImage is an image in blob string like this c916851b-3e53-432d-8d18-3de293776859?offset=0&size=371537 . Edit: I upload a base64 image to cpanel, and it is automatically cast to Blob. When I fetch the data from cpanel, I get a buffer array and unable to display it. I tried this but it doesn't work var blob = new Blob([img], {type: "image/png"}) var blobUrl = URL.createObjectURL(blob); And in

问题 I'm working on an audio web application where you can play along with music and record yourself. I'm working with a recorder plugin and I'm trying to save what has been recorded in a folder on a server. I get a blob file from the plugin via this javascript code: recorder.exportWAV(function(blob) { var xhr = new XMLHttpRequest(); var url = '../../audio/recordings/test.wav'; xhr.open('POST',url,true); xhr.onload = function(e) { if (this.status == 200) { console.log(this.responseText); } }; xhr

问题 I know this has been asked before, and I tried to implement the solution, but I just get exception errors when I call ps->executeUpdate(). Has anyone got an explicit example? 回答1: Sorry Matthew - I assumed the previous answer to this question (by elrohin). Maybe I should have replied to that. Anyway heres the code he suggested: class DataBuf : public streambuf { public: DataBuf(char * d, size_t s) { setg(d, d, d + s); } }; // prepare sql update statement etc. and set the data pointer string*

问题 I have an arbitray area and want to extract a path (series of pixels). The path should start and end so that you walk the longest way but always stay in the center, between your borders. Is there any sensible way to implement this in opencv? Basically a morphologic filter like erosion (to find the middle between the borders) sounds good. However I do not want to shorten the the length of the path. It does not need to be a fully automatic solution. User input, e.g. marking the start and end

问题 I have a problem reading a blob from a MySQL database with Java. I need to write a webservice with jax-rs to deliver an image saved in the database. For transport, it has to be encoded using Base64. This is my code: public String getImage(@PathParam("id") int id) throws SQLException{ System.out.println(id); String img64str = "null"; Blob image = null; Connection conn = MySQLConnection.getInstance(); if(conn != null) { try{ // Anfrage-Statement erzeugen. Statement query; query = conn