blob

问题 Is a way around this?? I am trying to insert some data into a table whose structure is: Column name Type Nulls crs_no char(12) no cat char(4) no pr_cat char(1) yes pr_sch char(1) yes abstr text yes The type of the last field reads 'text', but when trying to insert into this table, I get this error: insert into crsabstr_rec values ("COMS110","UG09","Y","Y","CHEESE"); 617: A blob data type must be supplied within this context. Error in line 1 Near character position 66 So this field is some

问题 I'm using the following code to insert into a blob field: MySql.Data.MySqlClient.MySqlConnection conn; MySql.Data.MySqlClient.MySqlCommand cmd; conn = new MySql.Data.MySqlClient.MySqlConnection(); cmd = new MySql.Data.MySqlClient.MySqlCommand(); string SQL; int FileSize; byte[] rawData; FileStream fs; conn.ConnectionString = "server=192.168.1.104;uid=root;" + "pwd=root;database=cady234;"; fs = new FileStream(@"d:\Untitled.gif", FileMode.Open, FileAccess.Read); FileSize = (int)fs.Length;

问题 This is one I just can't figure out: I have successfully built an upload feature on a web page to upload files to a MySQL Database. When I go on the server and open them via phpMyAdmin, they all look fine... txt, jpg, pdf, etc. Yet, after putting together THIS thing (below) to download it, I get a strange problem: All of the text documents (and all other types of files, after I change the extension to 'txt') contain HTML code of the page itself, followed by the original content! Also,

问题 I have searched about this matter a lot but, I didn't get a proper solution for my problem, I have following method for storing a file using java, private void uploadFile() throws Exception { Class.forName("com.mysql.jdbc.Driver").newInstance(); connection = DriverManager.getConnection("jdbc:mysql://127.0.0.1:3306/FileDb?autoReconnect=true", "user1", "123789"); System.out.println("DB connection extablished!"); PreparedStatement statement = connection.prepareStatement("INSERT INTO FilesTb(

问题 I'm generating a file client-side, I have the data in hexadecimal and just want to let the user download the generated file. var blob = new Blob([hexData], {type: "application/octet-stream"}); console.log(URL.createObjectURL(blob)); The resulting file is a plain-text file containing hex data in ASCII. How can I force the Blob to contain the binary data as is and not as text? 回答1: Derived from @Musa's solution above so I cannot take credit, but it's clearer to write this as an answer than my

问题 I am storing images in MYSQL. I have table as CREATE TABLE myTable (id INT, myImage BLOB); When I am trying to insert 4.7MB file, I am getting exception as com.mysql.jdbc.PacketTooBigException: Packet for query is too large (4996552 > 1048576). You can change this value on the server by setting the max_allowed_packet' variable. I believe this is related to image size only. Is there any other variable type that I can use? Update 1 As per older SO question, I also tried with MEDIUMBLOB but

问题 I'm sorry if this question has been asked already, but I couldn't find it anywhere. I have a table that stores files as BLOBS. The column that holds the file is an image datatype. I would like to be able to extract the binary data out of the column and turn it in to an actual file. I would ideally like to be able to do this with BCP or management studio if possible. I have tried BCP, but for some reason when I try and pull out an office document Word thinks it's corrupt. Here's what I've

问题 Is possible to change the Blob charset really? I'm trying it for hours but it doesn't workds. See this. jQuery("#download").click(function() { var csv_content = jQuery("#csv").val(), download = document.createElement("a"), blob = new Blob([csv_content], { type: "text/csv;charset=ISO-8859-1" }); download.href = window.URL.createObjectURL(blob); download.download = "test.csv"; var event = document.createEvent("MouseEvents"); event.initMouseEvent( "click", true, false, window, 0, 0, 0, 0, 0 ,

问题 I want to record audio from the microphone with HTML5, then send it to the server to be saved. Currently however, the saved file just contains [object Object] Here are some snippets of my code. Frontend: console.log(blob); $http.post('/api/save_recording', blob) .success(function(new_recording) { console.log("success"); }) The log prints: Blob {type: "audio/wav", size: 237612, slice: function} success Backend: exports.saveRecording = function(req, res) { console.log(req.body); fs.writeFile(

问题 I'm studying websocket and have done chat program with websocket/json. But I'm stuck at file uploading ATM. Any advice & answer would be thankful. Server side: package websocket; import java.io.File; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import java.nio.ByteBuffer; import javax.websocket.CloseReason; import javax.websocket.EndpointConfig; import javax.websocket.OnClose; import javax.websocket.OnError; import javax.websocket