blob

I would like to use MYSQL as a storage system for a huge number of files. I would like to read/write just a portion of the data stored in a column (data is stored as bytes) so I don't have to load the entire file into the application (because it can be > than a GB). So, in brief, I would like to have random read/write access in a blob column without loading the entire data into memory. Are there functions available to perform these operations? Thank you. MySQL treats blobs the same as strings (more or less) : BLOB values are treated as binary strings (byte strings). They have no character set,

function blobToString(blob) { var reader = new FileReader(); var d = ""; reader.onloadend = function() { d.callback(reader.result); console.log(reader.result); }; reader.readAsText(blob); return d; }; The above code does not work, but I guess my intentions are clear, I want to convert some binary data(WebKitBlobBuilder) to a string. Also the "console.log(reader.result);" doesn't display anything. Check out http://blog.ericzhang.com/state-of-binary-in-the-browser/ and his binary.js project . it should not be reader.onloadend but rather reader.onloaded or try reader.onload = function (e) { e

Good time of a day to everyone. I face with a huge problem during my work on previous week. Here ia the deal: I need to download exel file (blob) from ORACLE database through SAS. I am using: First step i need to get data from oracle. I used the construction (blob file is nearly 100kb): proc sql; connect to oracle; create table SASTBL as select * from connection to oracle ( select dbms_lob.substr(myblobfield,1,32767) as blob_1, dbms_lob.substr(myblobfield,32768,32767) as blob_2, dbms_lob.substr(myblobfield,65535,32767) as blob_3, dbms_lob.substr(myblobfield,97302,32767) as blob_4 from my_tbl;

I read a file using FileReader.readAsArrayBuffer and then do something like this: var compressedData = pako.gzip(new Uint8Array(this.result)); var blob1 = new Blob([compressedData]); // size = 1455338 bytes var blob2 = new Blob(compressedData); // size = 3761329 bytes As an example: if result has 4194304 bytes, after compression it will be size 1455338 bytes. But for some reason the Uint8Array needs to be wrapped in an Array. Why is this? Cf. documentation for BLOB constructor: https://developer.mozilla.org/en-US/docs/Web/API/Blob/Blob [the first argument] is an Array of ArrayBuffer,

I built a webpage where users can submit a PDF which is then inserted into a MySQL database in a mediumblob for retrieval later. This all works fine, except when the PDF contains images or embedded fonts, in which case the images are corrupted and any text using the font disappears (Acrobat display a message about the missing font). I've determined the problem occurs from my passing the pdf data through the mysql_real_escape_string_function. I have switched to base64_encode/base64_decode on submission/retrieval which fixed the problem for all new files, but I have about 25 already submitted

I'm currently working on inserting image on the firebird database and it's working fine alone, see the code below. $dbh = ibase_connect($host, $user, $pass); $blh = ibase_blob_create($dbh); ibase_blob_add($blh, $data); $blobid = ibase_blob_close($blh); $sql = "INSERT INTO blobtable(blobfield) VALUES (?)"; $sth = ibase_query($dbh, $sql, $blobid); but when I add some data on the insert statement suddenly the apache crash and stops working. See below code when I add new data. $dbh = ibase_connect($host, $user, $pass); $blh = ibase_blob_create($dbh); ibase_blob_add($blh, $data); $blobid = ibase

1. batch norm 输入batch norm层的数据为[N, C, H, W], 该层计算得到均值为C个，方差为C个，输出数据为[N, C, H, W]. <1> 形象点说，均值的计算过程为： (1) 即对batch中相同索引的通道数取平均值，所以最终计算得到的均值为C个，方差的计算过程与此相同。 <2> batch norm层的作用： a. 均值： (2) b. 方差： (3) c. 归一化： (4) 2. caffe中batch_norm_layer.cpp中的LayerSetUp函数： 1 template <typename Dtype> 2 void BatchNormLayer<Dtype>::LayerSetUp(const vector<Blob<Dtype>*>& bottom, 3 const vector<Blob<Dtype>*>& top) { 4 BatchNormParameter param = this->layer_param_.batch_norm_param(); //读取deploy中moving_average_fraction参数值 5 moving_average_fraction_ = param.moving_average_fraction(); //改变量在batch_norm_layer.hpp中的定义为bool

$fileCount = count($_FILES); for ($i = 0; $i < $fileCount; $i++) { $fp = fopen($_FILES["file_".$i]['tmp_name'], 'rb'); $stmt4 = $dbh - > prepare("INSERT INTO files_tbl (pin,remarks,fileblob,file_type,nameoffile,filesize) VALUES (?,?,?,?,?,?)"); $stmt4 - > bindValue(1, $pin, PDO::PARAM_STR); $stmt4 - > bindValue(2, $remarks, PDO::PARAM_STR); $stmt4 - > bindParam(3, $fp, PDO::PARAM_LOB); $stmt4 - > bindParam(4, $_FILES["file_".$i]['type'], PDO::PARAM_STR); $stmt4 - > bindValue(5, $_FILES["file_".$i]['name'], PDO::PARAM_STR); $stmt4 - > bindValue(6, $_FILES["file_".$i]['size'], PDO::PARAM_STR);