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Ways to avoid smarty conflicts with CSS syntax This article mainly introduces the method of avoiding the conflict between Smarty and CSS syntax, and analyzes the techniques of dealing with the conflict between Smarty and CSS in parentheses {}. The examples in this article describe ways to avoid conflicts between Sm

DUPLICATE KEY UPDATE ' class '. ' Course ' = ' class1 '. ' Course 'Other key: DELAYED as a quick insert, not very concerned about the failure, improve the insertion performance.IGNORE only focus on the primary key corresponding record is not present, none is added, there is ignored.For more information, see: Http://dev.mysql.com/doc/refman/5.1/zh/sql-syntax.html#insertSpecial note: In MySQL, the unique index will invalidate the null field, i.e. (a unique index on the A field):Copy CodeThe code

dbo.t1 as T1 left join test2.dbo. T2 as T2 on t1. Id = T2. UserId where T2. Id is null Returns the number of affected rows as 0 when executing again Not exists/not inINSERT intotest2.dbo.t2 (UserId, Birthday, Gender, Name)SELECTt1. Id, T1. Birthday, T1. Gender, T1. Name fromDbo.t1 asT1WHERE not EXISTS(SELECTT2. UserId fromtest2.dbo.t2 T2WHERET2. Userid=T1. ID) INSERT intotest2.dbo.t2 (UserId, Birthday, Gender, Name)SELECTt1. Id, T1. Birthday, T1. Gender, T1. Name fromDbo.t1

Avoid smarty conflicts with CSS syntax, smartycss syntax conflicts The examples in this article describe ways to avoid conflicts between Smarty and CSS syntax. Share to everyone for your reference. The specific analysis is as follows: People familiar with CSS will soon find that Smarty and CSS have conflicting syntax because both require braces {}. If you simply

Mysql ignores primary key conflicts and prevents repeated insertion of bitsCN.com Several ways for mysql to ignore primary key conflicts and avoid repeated inserts Solution 1: Use the ignore keyword Solution 2: Use replace Solution 3: ON DUPLICATE KEY UPDATE Solution 1: Use the ignore keyword If you use the primary key primary or the unique index unique to distinguish the uniqueness of a record, you can

can create a context-leaking chain, which is, of course, very bad. They allow you to run out of memory quickly. There are two simple ways to avoid the memory leaks associated with the context. The most obvious one is to avoid using it outside of the context itself. The example above shows a static reference within a class and an indirect reference to an externa

createtime--2016 December 8 15:28:40Author:marydonJsjquery two ways to avoid error messagesScripttype= "Text/javascript"> $(function() { /*method One: Catch exceptions*/ Try { $('Div[id=treecontainer]'). each (function(){ $( This). Width ($ ('#LeftPage'). width ()); }); } Catch(e) {}/*method Two: plus a non-null check*/ if ($('Div[id=treecontainer

the format is not correct, the program cannot continue execution. This also avoids SQL injection.For example\d-------Representative numbers\d{5}-------represents 5 digits\w+@\w+ [email protected] before the w+ means to have at least one character, @ means that the template must have an @ character.Of course, before using this technique, it is conditional, first of all, it needs to refer to a namespace, as follows:Imports Re=system.text.regularexpressions.regexThat's not enough, we need a way to

Label:In development, we often encounter such requirements, if the inserted data does not exist to insert the presence of the update ( or do not do anything ). The MySQL insert provides this functionality without the need for us to do the processing on our own business logic code. Directly with the functionality provided by MySQL. Click on the link below to see how to useHttp://www.cnblogs.com/zeroone/archive/2012/04/18/2454728.htmlhttp://www.sifangke.com/2013/05/mysql-insert-sql/MySQL three

) { string request = System.Web.HttpContext.Current.Request.Headers.Get (" X-requested-with "); if (string. Compare (Request, "XMLHttpRequest", true) = = 0) { Filtercontext.result = new Jsonresult {Data = "login timeout, please refresh the page!" " }; FilterContext.HttpContext.Response.ContentType = "Text/plain;charset=utf-8"; FilterContext.HttpContext.Response.Status = "403 Internal

stitching.2. SummaryIf the above is perfect, you can be sure that your program will run very well.Of course, sometimes we will be in order to improve the efficiency of the program to the activity level of resources used to upgrade to the process level, such as Imagecache, or other datamanager.I can only say that space and time are relative, sometimes need to sacrifice time for space, and sometimes need to sacrifice space in exchange for time. Memory is the existence of space, performance is the

Sqlserverbulkcopyoptions ();Copyoptions.setcheckconstraints (TRUE);3, through the Dts/ssis way:1. The Import/export data method requires that you first save the SSIS package and then modify the Connection Manager's properties 2. Direct use of SQL Server Business Intelligence Development stuidio new SSIS Package 3. By means of BCP1. First the data bcp out of bcp ... OutBCP Testdb.dbo.person out "bcp_data"/t/n/u * * * * * * * */S "****.sqlserver.rds.aliyuncs.com,3433"2. Then bcp the data in