Tags: mysqlMySQL study--mysql off automatic commit (autocommit)For MySQL, in the transaction process, the default is the dynamic commit (AUTOCOMMIT), the following methods can automatically close the autocommit;Case Analysis:1. Modify in MySQL login environment[email protected] soft]# mysql-u root-pEnter Password:Welcome to the MySQL Monitor. Commands End With; or \g.Your MySQL Connection ID is 4Server version:5.6.25-73.1 Percona Server (GPL), Release 73.1, Revision 07b797fCopyright (c) 2009-201
parentheses, for example:Local s = "am + df" print (string. find (s, "(m +)", 1, false) -- 2 2 m mprint (string. find (s, "(m +)", 1, false) -- 2 2 m
Another thing to note about capture is that the capture will only follow the string function when the pattern can be matched successfully. For example, I want to capture the letter, but in fact, this pattern cannot be matched at all, so it is certainly not returned:Local s = "am + df" print (string. fi
serial# main pty, from ttym,s = Os.openpty () print mprint s# display terminal name s = os. Ttyname (s) print mprint Sser = serial. Serial (s,9600,timeout=0.5) print "Open Port successful! The port information: "Print ser print" \ n "while Ser.isopen (): #the return is True or faulse print" Please write the M SG (Exit to break) " msg=raw_input () #add a break reason:::kill the child thread if msg
1. Match all the letters in the beginning of a line of text#coding =utf-8Import reS= "I love your not because of the WHO is you is, but because of the I am when I am with you"Content=re.findall (R "\b\w", s)Print contentC:\python27\scripts>python task_test.py[' I ', ' l ', ' y ', ' n ', ' B ', ' O ', ' w ', ' Y ', ' A ', ' B ', ' B ', ' O ', ' w ', ' I ', ' a ', ' w ', ' I ', ' a ', ' w ', ' Y ']2. Match all the beginning digits in a line of textImport reS= "I love because 12sd 34er 56df e4 5443
5G Hz band.9. Dynamic frequency selection (dynamically Frequency Selection Dfs) WLAN must be able to detect radar systems and select frequencies not used by radar systemstwo. Network Type
A basic service Set (basic services set, or BBS) consists of a set of workstations that communicate with each other.BSS is divided into two types:Stand-alone network independent BSS: A temporary network typically composed of a few workstations for specific purposes.Infrastructure-based network infrastructure
15.5-1Construct-optimal-bst (Root)N←length[root]Print r[1, n] is the rootPRINT-OBST (1, N)
Print-obst (i, J)m = R[i, j]If i = mPrint dm−1 D_{m-1} is the only child of the K_mElsePrint kr[i,m−1] k_{r[i, M-1]} is the left child of K_mPrint-obst (i, m-1)If j = mPrint DM d_m is the right child of the K_mElsePrint Kr[m+1,j] k_{r[m+1, J]} is the right child of K_mPrint-obst (M+1, J)
15.5-2The right binary search
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| -------------> Encapsulation of the data link layer
| ---------------------> Physical layer encapsulation
--> Meaning of the Two-byte type/length
Type refers to the protocol type applied by the upper layer.
If the value is greater than 0600 H, the type is smaller than 0060 H, indicating the length.
The minimum data transmission byte is 46 bytes.
5. Data Link Layer
1> Logical Link Con
in decimal format, this field indicates the Ethernet type and is type II.
· If the value of this field is less than or equal to the decimal value 1500, this field indicates the length and is 802.3. (See the description in IEEE 802.3 LLC package)
IEEE802.3 LLC encapsulation:
After the Ethernet II frame is improved, a new group is still needed to represent the type to identify the upper-layer protocol, t
X. Org may lose its domain name x.org
The X. Org Foundation faces the loss of an important asset: A single-letter domain name x.org. In the past six months, the board of directors of the X. Org Foundation tried to solve the issue of x.org domain name ownership in private, but failed to do so. The domain name will expire on March 13, January 19, with less than two weeks left. The registrant of the registered domain name is Leon Shiman and X. the founding member of The Org Foundation, who has no
The gold medal coach teaches you the detailed steps of Huawei ADSL route settings. Everyone is very interested in Huawei ADSL route settings. Before giving you a detailed description of how to set up the Huawei ADSL route, first let everyone know the basic process of general settings, and then compare the advantages and disadvantages of the following methods.
The model for configuring the Huawei ADSL route is MT800, Which is configured according to the instructions on the Huawei website, but can
, while increasing the 1-byte "Control" field, constitutes the header of the 802.2 Logical Link Control (LLC). LLC provides network services with no Connection (LLC Type 1) and connection-oriented (LLC type 2). LLC1 is applied to Ethernet, while LLC2 is used in Ibmsna network environments.The new 802.2LLC header includ
" refers to the port of the LAN access device at the level of access to the user device authentication and control. A user device connected to a port can access resources on the local area network if authenticated, and cannot access resources on the local area network-equivalent to a physical connection being disconnected.If you read the previous article, you should understand that EAPOL is used for EAP services in a local area network, and it is primarily used to load EAP packets to complete th
IDC Commentary Network (idcps.com) September 02 reported: According to Registrarstats published real-time data show, in the 4th Week of August (2015-08-24 to 2015-08-30), the global number of new registrations on the 15 top list, China occupies 4 seats, respectively, China million network , Nano-network technology, business China, Western Digital. Among them, China million new registered volume of 20,708, won the runner-up, last week's ranking rose 2. Next, please follow the IDC Review network t
cable 10base2 Thin cable 30 crystal head effective transmission distance: 185 m10BASE5 thick cable 100 crystal head effective transmission distance: 500 meters10 refers to the transfer rate of one m/s calculationTwisted pair 10baseT effective distance: 100 m5. Network by geographical division: WAN, LAN, metropolitan area networkWan is made up of good metropolitan area network6. The network is divided by topology type: Bus, star, ring, tree, netThe most used are: stars and treesSecond, Data link
an integrated bridge, router, or lan switch. Currently, these hubs are usually in the form of chassis.
5. Exchange Hub
At present, the boundaries between the hub and the switch have become blurred. The exchange hub has a core exchange backplane that uses a pure exchange system to replace the traditional shared media relay network segment. Such products are available and hybrid (relay/switch) hubs are likely to control the market in the next few years. It should be noted that there is almost no
operate mode to enable. In the drop-down list of the Connection Type field, select the "PPPoE LLC" option from the text box. The principle of pppoe mux or pppoe llc is consistent with the NAS encapsulation method, generally, LLC encapsulation is recommended. For example, the default PVC encapsulation of ISN8850 of Huawei is
IDC Commentary Network (idcps.com) September 01 report: According to Registrarstats published real-time data display, as of August 29, 2015, GoDaddy.com, LLC with 51,786,809 domain names registered Holdings ranked first in the world, A net increase of 287,893 monthly, the advantage is remarkable. In addition, the number of domain name registration 15 Strong rankings, the chain of the previous period unchanged. Below, please look at the IDC commentary
so that the other sites on the line can detect the conflict as early as possible.4. After the terminal device detects a conflict, it waits for a period of time before the data is sent (the delay time is determined by the Backoff algorithm).CSMA/CD's working principle can be summed up as follows: First listen to the post, the side of the hair and listen, the conflict stopped, random delay after the re-hair.Physical layer devices: repeaters and hubsData Link LayerThe data link layer is divided in
IDC Commentary Network (idcps.com) March 14 reported: According to Registrarstats published real-time data display, as of March 9, 2016, the global domain name registration market, only foreign domain name Quotient godaddy.com, LLC and enom Domain name Holdings more than 1 , 0, the two superior status, the advantages of no one can. Chinese domain name quotient ranked best is China million network, with the number of domain name 5,166,684 ranked 6th. B
because it is occupied by modem). The subnet mask is 255.255.255.0 and the gateway is 192.168.1.1. After completing the above work, we will start to configure ADSL modom. Open IE, enter 192.168.1.1 in the address bar, and press enter to display the user login page. In the "user name" and "password" columns, you can log on to the vro management interface after the user name and password of the modem are respectively entered.Open the web page and click "ATM setting" to change the operate mode to
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