blob

问题 I'm actually developing an application with Angular7 which capture the user webcam when he his watching a video directly on the website. When the video is over, I need to send the camera video directly to my firebaseStore. My problem is that I can download my video, but I have to download it first, and then upload it again in the app using an HTML input, because I'm using a blob URL in order to get the video, and I didn't find any way to send it automatically to my firebaseStore. I have

问题 I'm updating an existing application which uses a factory to build prepared statements, and then execute them later, which works for the rest of the system, but I've been tasked with adding a call to a statement which uses an NText, and I cannot figure out how to properly prepare the statement. I am getting a runtime error of "SqlCommand.Prepare method requires all variable length parameters to have an explicitly set non-zero Size." but I'm not sure what value to use for the Length Obligatory

问题 Hi I tried to store and retrieve image to and from sqlite database. My following codes is not working. I'm not sure what wrong I did. Please help. I created the database table as follows: db = openOrCreateDatabase("StudentDB", Context.MODE_PRIVATE, null); db.execSQL("CREATE TABLE IF NOT EXISTS student(rollno VARCHAR, name VARCHAR,photo BLOB,marks VARCHAR);"); then I inserted the fields db.execSQL("INSERT INTO student VALUES('" + editRollno.getText() + "','" + editName.getText() + "','" +

问题 I'm investigating an interesting performance issue, where there are no calls to java.sql.Clob.free() on a frequently used resource. This method on Clob was introduced in Java 6 / JDBC 4, so it might well be that this is actually a regression introduced when upgrading from JDBC 3 to JDBC 4. Is this a known issue in the Oracle JDBC driver? Can it be said that before, Clobs somehow magically freed themselves, whereas with JDBC 4, they MUST be freed manually? Or is there a driver setting that can

问题 A have image save in mysql database as bolb and I wish to display it out in fpdf using php. I'm having problem doing this as I am very new to fpdf. I really need help. Thank you. 回答1: You will need this extension to FPDF: http://www.fpdf.org/en/script/script45.php [updated] $query = "SELECT imageField FROM yyy WHERE ..."; $result = mysql_query($query); $row = mysql_fetch_assoc($result); $image = $row['imageField']; $pdf->MemImage($image, 50, 30); 回答2: //Alternatively //1) Put the class

问题 My code is like below. Name - as TEXT field, Photo - as BLOB data class SqlQueryModel: public QSqlQueryModel { Q_OBJECT QHash<int,QByteArray> *hash; public: explicit SqlQueryModel(QObject * parent) : QSqlQueryModel(parent) { hash = new QHash<int,QByteArray>; hash->insert(Qt::UserRole, QByteArray("Name")); hash->insert(Qt::UserRole + 1, QByteArray("Photo")); } inline RoleNameHash roleNames() const { return *hash; } }; Selecting data view = new QQuickView(); QSqlQueryModel *someSqlModel = new

问题 I load my image (blob data ) in my GETer Entity When I just return ($this->foto) in my GETer I see :Resource id #284 on the screen When I change my GETer like this : return stream_get_contents($this->foto); I see these : ���JFIF��� ( ,,,,,,,, ( and more ) In my Controller a call the index.html.twig to show all my entities /** * Lists all Producten entities. * */ public function indexAction() { $em = $this->getDoctrine()->getManager(); $entities = $em->getRepository('CustomCMSBundle:Producten'

问题 blob has null prepended at the start eg : blob:null/72438-4637-23673-34721. But when I use the same as a src to the , it shows up the correct image. I am using URL.createObjectURL call. I also tried using webkitURL. Both return a blob with null appended at the start. Also the blob value returned by URL and webkitURL are not the same. Here is the code snippet var dataUrl = canvas.toDataURL(); // The last piece of the data URL after the comma var byteString = atob(dataUrl.split(',')[1]); //

问题 I am trying to find an easy solution to implement the OCR algorithm from OPenCV . I am very new to Image Processing ! I am playing a video that is decoded with specific codec using RLE algorithm . What I would like to do is that for each decoded frame, I would like to compare it with the previous one and store the pixels that have changed between the two frames. Most of the existing solutions gives a difference between the two frames but I would like to just keep the new pixels that have

问题 I'm trying to insert the image into mysql database table directly. In my database I'm always getting [BLOB - 0B]. it doesn't insert images into table. I didn't get any error too. I'm confused.. PHP ini_set('display_startup_errors',1); ini_set('display_errors',1); error_reporting(-1); include('config.php'); if (isset($_FILES['image']) && $_FILES['image']['size'] > 0) { $tmpName = $_FILES['image']['tmp_name']; $fp = fopen($tmpName, 'r'); $data = fread($fp, filesize($tmpName)); $data =