empty string

I. Overview of the MySQL engineThe 1.MyISAM Storage Engine MyISAM table is independent of the operating system, which means that it can be easily ported from a Windows Server to a Linux server, and whenever we build a table for a MyISAM engine, we

The LOAD DATA infile statement reads from a text file into a table at a high speed. If you specify the local keyword, read the file from the client host. If local is not specified, the file must be located on the server. (Local is available in MySQL3

Numeric typeMySQL's numeric data types can be roughly divided into two categories, one is an integer and the other is a floating-point or decimal. Many different subtypes are available for each of these categories, and each subtype supports data of

MySQL study--mysql Ordinary users cannot log on locallyAfter the installation has completed MySQL, we usually add a regular user with the appropriate permissions to access the database. When using the user to log in to the database, often there is

Table of Contents: One, self increment, decrement operator two, Boolean operator (!, &&, | |) Three, multiplicative operator (multiplication, division, modulus) four, addition five, the relationship Operation selector, self-increment, decrement

ObjectiveIn Java projects, for example, we often use the split method of string to process text, and in Map/reduce, we also need to split the HDFs file after it has been read, and also involves split. A few days ago, the original "good" program,

A line of JavaScript code that can be loaded2016-06-28 Wild DogA line of Magic JS Code, then I was shocked, this is not the legendary ZB magic ... Ha ha.The reason for writing an article is that I saw a section of JS code before, as follows:(! (~+[])

Web page Visible area width: document.body.clientWidth;Web page Visible Area High: document.body.clientHeight;Web page Visible Area width: document.body.offsetWidth (including the width of the edge);Web page Visible Area High:

thinkphp function: I method browse: 144722 Release Date: 2013/06/01 Category: Documentation Tutorial Keywords: functionsThe I method of thinkphp is 3.1.3 is new, if you are a previous version of 3.*, you can refer directly to the variables section

A line of magical JavaScript codeA line of Magic JS Code, is in a blog park inside see, then I was shocked, this is not the legendary ZB magic ... Haha (decisively reproduced over). The reason for writing an article is that before the group of Ink

Both the substr function and the substring function are used to extract the "substring" from a "parent string. However, there are some differences in usage. Substr Method Definition and usage The substr method returns a substring of the specified

As you can see, the I method is a new member of the thinkphp many single-letter functions, whose name comes from the English input (input), which is mainly used for more convenient and secure access to the system input variables, which may be used

A detailed explanation of the use of filter in Python 1 class Filter (object) 2 | Filter (function or None, iterable)--Filter Object3 | 4 | Return an iterator yielding those items of iterable for which function (item) 5 | Is true. If

OneSFX(self-extractingA self-extracting file is a compressed file, which combines an executable module with a module that runs an extract file from a compressed file. Such a compressed file does not require an external program to decompress the

The I method of ThinkPHP is a new member of many single-letter functions. it is mainly used to conveniently and securely obtain system input variables and can be used anywhere. This article mainly introduces the ThinkPHP I Method. For more

Use of the three functions ISSET (), empty (), and is_numeric () in PHP form verification. ISSET (); -- this parameter is suitable for detecting whether this parameter exists. Definition and scope of action: used to test whether a variable has a

This is a creation in Article, where the information may have evolved or changed. Why Base64 Pictures for RESTful services Data URIs 支持大部分浏览器,IE8之后也支持. 小图片使用base64响应对于RESTful服务来说更便捷 Godoc Documentation Online demo Playground Powered by

The OpenFileDialog (Open File Dialog) component of Windows forms is a pre-configured dialog box. It is the same as the Windows operating system Open File dialog box. The control is inherited from the CommonDialog class. In a Windows-based

String str 1:string. IsNullOrEmpty = = Str This method is my favorite, it not only can judge "empty string variable", but also can judge "value is empty string variable", and also can make the code simple and beautiful. The efficiency of judgment is

[PHP]; PHP is also a constantly evolving tool, and its functionality is constantly being truncated.; And PHP.ini's settings change can reflect a considerable change,; It's good to study php.ini before using the new PHP version.;;;;;;;;;;;;;;;;;;;;