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MYSQL数据类型 MySQL中定义数据字段的类型对数据库的优化是非常重要的。 MySQL支持多种类型，大致可以分为三类： 数值 、 日期/时间 和 字符串(字符) 类型。 数值类型 MySQL支持所有标准SQL数值数据类型。 这些类型包括严格数值数据类型(INTEGER、SMALLINT、DECIMAL和NUMERIC)，以及近似数值数据类型(FLOAT、REAL和DOUBLE PRECISION)。 关键字INT是INTEGER的同义词，关键字DEC是DECIMAL的同义词。 BIT数据类型保存位字段值，并且支持MyISAM、MEMORY、InnoDB和BDB表。 作为SQL标准的扩展，MySQL也支持整数类型TINYINT、MEDIUMINT和BIGINT。 口诀就是12448字节。 类型 大小 范围（有符号） 范围（无符号） 用途 TINYINT 1 字节 (-128，127) (0，255) 小整数值 SMALLINT 2 字节 (-32 768，32 767) (0，65 535) 大整数值 MEDIUMINT 3 字节 (-8 388 608，8 388 607) (0，16 777 215) 大整数值 INT或INTEGER 4 字节 (-2 147 483 648，2 147 483 647) (0，4 294 967 295) 大整数值 BIGINT 8 字节

Versions I am running (basically latest of everything): PHP: 5.3.1 MySQL: 5.1.41 Apache: 2.2.14 OS: CentOS (latest) Here is the situation. I have thousands of very important documents, ranging from customer contracts to voice signatures (recordings of customer authorisation for contracts), with file types including, but not limited to jpg, gif, png, tiff, doc, docx, xls, wav, mp3, pdf, etc. All of these documents are currently stored on several servers including Windows 32 bit, CentOS and Mac, among others. Some files are also stored on employees desktop computers and laptops, and some are

I have this in my Angular.js controller that downloads a CSV file: var blob = new Blob([csvContent.join('')], { type: 'text/csv;charset=utf-8'}); var link = document.createElementNS('http://www.w3.org/1999/xhtml', 'a'); link.href = URL.createObjectURL(blob); link.download = 'teams.csv'; link.click(); This works perfectly in Chrome but not in IE. A browser console log says: HTML7007: One or more blob URLs were revoked by closing the blob for which they were created. These URLs will no longer resolve as the data backing the URL has been freed. What does it mean and how can I fix it? Naim

I'm trying to understand HTML5 API. I'm designing the web application where the browser client need to download multiple files from server; user will perform something with the downloaded files and the application than need to save the state on user hard-rive. I understand that the browser can save these files only to its sandbox which is fine as long as the user can retrieve those files on the second time he starts the application. Should I use BlobBuilder or FileSaver? I'm a bit lost here. mayconbordin I'm going to show you how to download files with the XMLHttpRequest Level 2 and save them

I have a simple PHP web app that accepts icon images via file upload and stores them in a MEDIUMBLOB column. On my machine (Windows) plus two Linux servers, this works fine. On a third Linux server, the inserted image is corrupted: unreadable after a SELECT, and the length of the column data as reported by the MySQL length() function is about 40% larger than the size of the uploaded file. (Each server connects to a separate instance of MySQL.) Of course, this leads me to think about encoding and character set issues. BLOB columns have no associated charsets, so it seems like the most likely

I have a sql server database that returns byte for the image. If I use the tableadapter wizard and set it to my stored procedure and preview data, it pulls back an image. It automatically turns it into an image in the preview data. I don't see it as a string of Ints or anything. How can I display it on my asp.net webpage with a gridview and objectdatasource? I have searched and foudn where the imagefield can point to a url on another page that does the byte transformation but I'm not sure it's the best. I found another way that creates a temp file. Just trying to see the best way to do it.