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最近在做关于文件下载的需求：前端调用接口，然后对返回数据进行过滤、格式化，然后按表格内容拼接生成csv文件，让用户下载。 具体实现方式如下：let sourceData = { head: [ '时间', '成交价格', '成交数量', '手续费', '成交金额', ], data: [ {time: '2019-10-17 14:54:52', tradePrice: '30.0022.001.32 TWD', fee:'0 TWD', tradeAmount: '660.00',}, {time: '2019-10-17 14:54:36', tradePrice: '30.0089.005.34 TWD', fee:'0 TWD', tradeAmount: '2,670.00',}, {time: '2019-10-17 14:54:07', tradePrice: '21.00500.0021 TWD', fee:'0 TWD', tradeAmount: '10,500.00',}, ] } // 格式化 const data = [sourceData.head.join(',')].concat(sourceData.data.map(item => { return [ item.time, `"${item.tradePrice}"`, `"${item.fee

111 来源： https://www.cnblogs.com/wqbin/p/11903878.html

I have a C# program that inserts a pdf inside a MySQL database. Now I want to retrieve that pdf via django but django's models.FileField needs an "Upload To" parameter which means behind the scenes it actually stores the File on the file system rather than in the database. Is there any way I can set up a django model so that I can store the pdf directly inside MySQL? Regards I have been dealing with this same issue, writing a pdf to a mediumblob field in mysql and retrieving via django. I have set the mysql field type to a mediumblob and the django field type to textfield. I have used a

I'm trying to download a file from cloudBlob via stream. I refer to this article CloudBlob Here is the code to download the blob public Stream DownloadBlobAsStream(CloudStorageAccount account, string blobUri) { Stream mem = new MemoryStream(); CloudBlobClient blobclient = account.CreateCloudBlobClient(); CloudBlockBlob blob = blobclient.GetBlockBlobReference(blobUri); if (blob != null) blob.DownloadToStream(mem); return mem; } And the code to convert it into byte array public static byte[] ReadFully(Stream input) { byte[] buffer = new byte[16 * 1024]; using (MemoryStream ms = new MemoryStream(

I have successfully set up FILESTREAM on my SQL 2008 server; however I've noticed that even when I have deleted rows containing FILESTREAM data, the physical data file doesn't seem to get deleted. By the physical file, I mean the file in SQLServer's managed directory with a uniqueidentifer as the filename not the original file added to the dbase. Does anyone know if SQLServer will delete the file eventually? If there are a lot of large files removed from the dbase I'd expect to be able to reclaim the space quickly that's all. FILESTREAM data is subject to transaction control and therefore is

How can I search inside Blob column in MySQL for some values ? and Is that possible ? Zilverdistel You should be able to search blobs like other text fields: SELECT * FROM tablename WHERE blob_field_name LIKE '%value%' One thing to notice is that search will be case-sensitive! Anyway, if possible, it's better to use a TEXT field. If you want to make it work for both uppercase, lowercase or mixed... Make the search string in lower case before applying in mysql query and use LOWER() mysql function in query. make sure to escape string for mysql. $search_text = strtolower($search_text); $query =

I'm creating a system in which users can store messages via PHP with a MySQL database, and I am using the MySQL AES_ENCRYPT function to encrypt the contents of these messages. Here is my posts table: CREATE TABLE IF NOT EXISTS `posts` ( `id` int(11) NOT NULL AUTO_INCREMENT, `user` int(11) DEFAULT NULL, `group` int(11) DEFAULT NULL, `body` varbinary(1000) NOT NULL, `ip` varchar(45) NOT NULL, `date` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP, `replyto` int(11) DEFAULT NULL, PRIMARY KEY (`id`), KEY `replyto` (`replyto`), KEY `user` (`user`) ) ENGINE=InnoDB DEFAULT CHARSET=latin1 AUTO_INCREMENT

I'd like to create a thumbnail from an image and then insert that thumbnail in SQLite as BLOB. (without saving thumbnail as file first) My code; from PIL import Image size = 120,120 file = "a.jpg" imgobj = Image.open(file) imgobj.thumbnail(size) But how to save it to SQLite as BLOB Well, there are many ways, and this is one of them: import sqlite3 from PIL import Image size = 120, 120 file = "/tmp/a.jpg" imgobj = Image.open(file) imgobj.thumbnail(size) con = sqlite3.connect("/tmp/imagesdb") cur = con.cursor() cur.execute("create table img (x blob)") cur.execute("insert into img(x) values(?)",