Exercise 40: A dictionary, a lovely dictionaryNext I'm going to teach you a different kind of container-type data structure, because once you've learned this kind of container, you're going to have super cool power. This is the most useful container: the dictionary (dictionary).Python calls this data type "Dict", and in some languages its name is "hash". I'll use both of these names, but it doesn't matter, it's the difference between them and the list. You see, for a list you can do something li
Review the struct today and dig up the little details that you didn't notice before:
Basic definition: Structure, popular speaking is like packaging packaging, some of the common characteristics (such as the attributes belonging to a certain kind of things, often a business-related attribute of aggregation) of variables encapsulated in the internal, through a certain method access to modify internal variables.
structure Body Definition:
The first: Only the definition of the struct body
stru
integer of the enumerated variable. For example, we will:
For (int n = 0; n
If (list. items [n]. e = MyEnum. VAL_X)
// Do stuff 1
Else if (list. items [n]. e = MyEnum. VAL_Y)
// Do stuff 2
}
Replace:
Int valX = MyEnum. VAL_X.ordinal ();
Int valY = MyEnum. VAL_Y.ordinal ();
Int count = list. size ();
MyItem items = list. items ();
For (int n = 0; n
{
Int valItem = items [n]. e. ordinal ();
If (valItem = v
Well, I've found some content on the Internet, and we've integrated some of the built-in methods of SQL Server The first is the Convert method: https://msdn.microsoft.com/zh-cn/library/ms187928.aspx CONVERT (data_type (length),data_to_be_converted,style) This method is equivalent to formatting the date data into a string output. And then the stuff method: https://msdn.microsoft.com/zh-cn/library/ms188043.aspx STUF
page and not modify it to ensure that the user can bookmark the current script state of the page.
6. For the sake of others
(namespaces, scopes, and patterns)
Your code is almost never the only script code in the document. So it's especially important to make sure that you don't have global functions or global variables that other scripts can overwrite in your code. There are some available patterns to avoid this problem, the most fundamental thing is to use the VAR keyword to initialize all
,
name = (
stuff (
Select, ' + name from table_a where category = A. Category for XML Path (')),
1,
1,
'
)
) from
table_a as A Group by category
Here, using the SQL Server 2005 version of stuff and for XML path, let's say the role in the SQL above, and then explain the two uses in more detail.
Copy Code code as follows:
FOR XML Path (')
This sentence is to
Label:
Example
Stuff
FOR XML Path
Reference articles
ExampleThere was a problem with SQL Server yesterday: I had to write a stored procedure to process the data in several tables, and finally the problem was that I wanted to stitch up the rows of one column of a table into a row, such as a table with two columns of data:
category
name
Aaa
Enterprise 1
Aaa
The string truncation function refers to: Stuff and SubString, string lookup functions are: CharIndex and PatIndexOne, SubString intercept sub-stringThe most commonly used string function to intercept substrings of a specific length.SUBSTRING (expression, start, length)Parameter description:
Start parameter: An integer that represents the starting position; The ordinal of the character (index) starts at 1, that is, the ordinal of the first ch
Label:Note: This article is for sharing only, the copyright belongs to the original author. A problem with SQL Server was encountered yesterday: a stored procedure was needed to process the data from several tables, and finally the problem was that I wanted to stitch a row of rows of one column of a table For example, there are two columns of data in the table: Ep_Classes Ep_name AAA Enterprise 1 AAA Enterprise 2 AAA Enterprise 3 BBB Enterprise 4 BBB Enterprise 5 I want to make this table the
Android 5.1 Introduction:Http://developer.android.com/about/versions/android-5.1.html?utm_campaign=lollipop-51-315utm_source=dac utm_medium=blogThe 5.1 targetSdkVersion is "22" Look at the NEW:1Multiple SIM Card SupportAndroid 5.1 adds support for using the than one cellular carrier SIM card at a time. This feature lets users activate, and use additional SIMs on devices, that has both or more SIM card slots. You can access information about the curr
it does not have the concept of user ID, which is vital to operate other security mechanic Sims and policies. this means some care must be taken in fitting the varous security mechanisms on a network together. for example, if you need to control which users access your database server, you need some non-IPSEC mechanisms for that. IPSEC can control which machines connect to the server, and can ensure that data transfer to those machines is done secure
today, especially in China, dual sim is so popular and so widespread that dual sim has become the de facto standard for smartphones. The general trend, for this, Android from Android 5.1, starting from the Android SDK API level to support dual SIM card or more than 1 SIM cards. Android Official documentation explained Link:Https://developer.android.com/about/versions/android-5.1.html#multisimOriginal:Multiple SIM Card Support android 5.1 adds support for using more than one cellular carrier S
substring ('abcdefg' from 2 );
Result: bcdefg
2) in MySQL, if the from table is (select...), an alias must be followed.
3) the connection string is used in Oracle. | + is used in SqlServer and concat ('A', 'B', 'C') is used in MySQL ')
4)
In SqlServer:
Declare @ id varchar (50 );
Set @ id = '4028e4962c3df257012c3df3b4850001 ';
Select * from sims_sample_detect where ID = @ id;
In MySQL:
Set @ a = 189;
Select * from bc_article where id = @ a // do not use declare
Statement in Orcale:
5)
At the Ubuntu developer summit in Auckland, California, ChrisKenyon, vice president of Canonical OEM services, said about 8 million to 10 million computers were pre-installed with Ubuntu last year and the number is expected to reach 18 million next year, it accounts for 5% of the global computer market. Other messages at the Conference include: the Ubuntu developer plan forkGNOMEControlCenter, which creates the Ubuntu Control Center. Ubuntu12.10 will include most of GNOME3.6
At the Ubuntu devel
alias must be followed.3) The connection string is used in Oracle. | + is used in SqlServer and concat ('A', 'B', 'C') is used in MySQL ')4)In SqlServer:Copy codeThe Code is as follows:Declare @ id varchar (50 );Set @ id = '4028e4962c3df257012c3df3b4850001 ';Select * from sims_sample_detect where ID = @ id; In MySQL:Copy codeThe Code is as follows:Set @ a = 189;Select * from bc_article where id = @ a // do not use declare Statement in Orcale:5) MySQL stored procedure:Copy codeThe Code is as fol
, such as "Biochemical Crisis" series, "Tomb Raider" series, "Dinosaur Crisis" and so on, and the puzzle type AVC game purely rely on the puzzle to pull the development of the plot, the difficulty coefficient is larger, such as Super classic " Mysterious Island series. 4. Strategy Game (SLG)This kind of game is more free and open, so players need to play the game in the Limits (game rules) to try to achieve the goal.Strategy game can be divided into two kinds of back-up system and real-time sy
In this paper, we describe the method of public platform to obtain user OpenID. Share to everyone for your reference. The specific analysis is as follows:
After the user clicks on the Custom menu view Type button, the client will open the URL value (ie link) that the developer fills in the button to reach the Web page, but the view cannot get the user's OpenID, and it needs to use the advanced interface of "Web license Access user basic information", Get the user's login personal information.
S
(Picture from 1d4chan)
Http://code.google.com/p/dwarftherapist/
Slaves to armok: God of blood: chapter II: Dwarf Fortress (Dwarf Fortress for short) is one of the most powerful games in the world.In fact, this game is very simple... No, it is very complicated and very complicated.The game is divided into two modes: The Castle mode and the adventure mode. The castle mode is to lead the seven dwarf and open a wasteland into a magnificent castle. As the castle grows, other dwarf people will
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