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在早期Bootstrap框架介绍中，我的随笔《 结合bootstrap fileinput插件和Bootstrap-table表格插件，实现文件上传、预览、提交的导入Excel数据操作流程 》中介绍了利用Bootstrap FieInput插件上传Excel文件到服务器，然后利用Bootstrap-table表格插件进行展示数据，最后导入到系统里面中，这个导入过程中可以预览到要导入的数据，而且可以选择性的导入。在实际使用过程中，发现使用Ajax导入大批量（几百条记录数据）的情况下，页面就会罢工，估计和提交的数据大小限制有关，为了解决这个问题，并结合导入数据一般都是全部导入的情况下，我们修改下数据导入的过程，从而实现大量数据量的Excel数据导入。 1、使用预览数据，并勾选导入的处理方式 Excel导入的的界面展示如下所示。 这样我们就可以把Excel的记录展示出来，实现了预览的功能，勾选必要的记录，然后保存即可提交到服务器进行保存，实现了Excel数据的真正导入数据库处理。 实际的代码就比较多一点点，详细可以参考下随笔《 结合bootstrap fileinput插件和Bootstrap-table表格插件，实现文件上传、预览、提交的导入Excel数据操作流程 》，这里就主要简要介绍下导入的处理逻辑即可，由于是在客户端组装列表数据，然后通过ajax提交的，它的的代码如下所示。

What really is the difference between MySQL UNHEX and X when dealing with hexadecimal values in a database? Eg. SELECT * FROM test WHERE guidCol IN (UNHEX('hexadecimalstring')); SELECT * FROM test WHERE guidCol IN (X'hexadecimalstring'); Both gives me exact result set. So is there any difference? Performance implications? Edit: the underlying type of guidCol is binary of course UNHEX() is a function , therefore you can do something like SET @var = '41'; SELECT UNHEX(@var); SELECT UNHEX(hex_column) FROM my_table; X , on the other hand, is the syntax for a hexadecimal litteral . You cannot do

需求是表里的某个字段存储的值是以逗号分隔开来的，要求根据分隔的每一个值都能查出来数据，但是不能使用 like 查询。 数据是这样的： 查询的sql如下： select * from ( select guid, regexp_substr(st_responsible, '[^,]+', 1, level) responsible from tt_cancle_responsible connect by level <= regexp_count(st_responsible, ',') + 1 and guid = prior guid and prior dbms_random.value is not null ) where responsible ='wyy'; 文章来源: Oracle字段根据逗号分割查询数据

My colleague and I are debating which of these methods to use for auto generating user ID's and post ID's for identification in the database: One option uses a single instance of Random, and takes some useful parameters so it can be reused for all sorts of string-gen cases (i.e. from 4 digit numeric pins to 20 digit alphanumeric ids). Here's the code: // This is created once for the lifetime of the server instance class RandomStringGenerator { public const string ALPHANUMERIC_CAPS = "ABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890"; public const string ALPHA_CAPS = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"; public

I have a GUID variable and I want to write inside a text file its value. GUID definition is: typedef struct _GUID { // size is 16 DWORD Data1; WORD Data2; WORD Data3; BYTE Data4[8]; } GUID; But I want to write its value like: CA04046D-0000-0000-0000-504944564944 I observed that: Data1 holds the decimal value for CA04046D Data2 holds the decimal value for 0 Data3 holds the decimal value for next 0 But what about the others? I have to interpret myself this values in order to get that output or is there a more direct method to print such a variable? Use the StringFromCLSID function to convert it

This question already has an answer here: Generating Guids in Ruby 10 answers I use Rails 3.0.20 and ruby 1.8.7 (2011-06-30 patchlevel 352) Please suggest me the best plugin to generate guid. There are plenty of options, I recommend not to add additional dependencies and use SecureRandom which is builtin: SecureRandom.uuid #=> "1ca71cd6-08c4-4855-9381-2f41aeffe59c" See other possible formats here . The first thing I would suggest is that please upgrade your ruby and rails version. A very good way of generating guid is SecureRandom , which is a ruby module. With easy usage. require

Any best practice on how a reset password token should be constructed? I'm thinking: random 17 characters [a-zA-Z0-9] + a globally unique id + random 17 characters [a-zA-Z0-9]. Is there a better solution, or an industry standard on reset password tokens? martinstoeckli There are some important points to consider. The code should be really random (read from MCRYPT_DEV_URANDOM), and should not be derrived from other user related information. Ideally the code is base62 encoded (A-Z a-z 0-9) to avoid problems with the Url. Store only a hash of the token in the database , otherwise an attacker with

Is there a difference when you generate a GUID using NewGuid(); vs System.Guid.NewGuid().ToString("D"); or they are the same thing? Guid.NewGuid().ToString() is string representation of GUID, i.e. returns string object, while Guid.NewGuid() returns Guid datatype. I realize that this question already has an accepted answer, but I thought it would be useful to share some information about formatting guids. The ToString() (no parameters) method formats a guid using this format: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx The ToString(string format) method formats a guid in one of several ways: "N" -

This Code: Something = new Guid() is returning: 00000000-0000-0000-0000-000000000000 all the time and I can't tell why? So, why? Will Dean You should use Guid.NewGuid() Just a quick explanation for why you need to call NewGuid as opposed to using the default constructor... In .NET all structures (value types like int, decimal, Guid, DateTime, etc) must have a default parameterless constructor that initializes all of the fields to their default value. In the case of Guid, the bytes that make up the Guid are all zero. Rather than making a special case for Guid or making it a class, they use the

i came across the need to cleanse some data, and i need to find some particular guids (i.e. uniqueidentifiers ) in SQL Server°. i've come up with a stored procedure that does a SELECT from every uniqueidentifier column in every table in the current database, and returns a result set if the guid is found. It uses the INFORMATION_SCHEMA views to find all uniqueidentifier columns in all base tables (as opposed to views). For each column it issues a select, returning the name of the table and the column where it was found. CREATE PROCEDURE dbo.FindGUID @searchValue uniqueidentifier AS /* Search