1. Build a tableCREATE TABLE ' T_log_code_num ' (' id ' int (one) not NULL auto_increment,' server_id ' int (3) is not NULL,' Date ' date is not NULL,' Code ' varchar (not NULL),' num ' int (ten) is not NULL,PRIMARY KEY (' id ')) Engine=myisam DEFAULT Charset=utf8;2. Data entryINSERT into T_log_code_num (' server_id ', ' Date ', ' Code ', ' num ') VALUES (' 1 ', ' 2017-07-31 ', ' 201058 ', ' 1 ');INSERT into T_log_code_num (' server_id ', ' Date ', ' Code ', ' num ') VALUES (' 2 ', ' 2017-07-31
54527151 (3:nrow:272 rrow:272) ... leaf:0x34004a9 54527145 (473:nrow:420 rrow:420) leaf:0x34004ad 54527149 (474:nrow:420 RR
ow:420) leaf:0x34004b1 54527153 (475:nrow:420 rrow:420) leaf:0x34004b5 54527157 (476:nrow:420 rrow:420) Leaf:0x34004e2 54527202 (477:nrow:96 rrow:96)-----End tree Dump #模拟插入数据, then split the root node with an index height of 2 sql> alter session set EV
Ents ' immediate trace name treedump level 126545 ';
Session altered. -----Begin tree Dump BRANCH:0X34000E3 5452617
=NewRECTF (80, 260, 200, 300);//set a new rectangleCanvas.drawroundrect (OVAL3, p);//The second parameter is the X-radius, and the third parameter is the Y-radius//Draw Bezier CurvesCanvas.drawtext ("Drawing Bezier curve:", 10, 310, p); P.reset (); P.setstyle (Paint.Style.STROKE); P.setcolor (Color.green); Path path2=NewPath (); Path2.moveto (100, 320);//set the starting point for pathPath2.quadto (150,
) −s (c,a)The gain represents the entropy of the classification target minus the entropy of the current attribute, the greater the gain, the stronger the classification ability(the former is called Empirical entropy, which indicates the uncertainty of the data set classification C, the latter is the empirical condition entropy, which indicates that the uncertainty of the data set classification C under the condition given a is called mutual information, and the gain of the decision tree is equiv
6.4 M vim-enhanced i386. 0.109-7.2.el5 base 1.2 MUpdating: vim-minimal i386. 0.109-7.2.el5 base 310 k Transaction Summary ============================== ========================================================== ======= Install 3 Package (s) update 1 Pac Kage (s) Remove 0 Package (s) Total download size: 9.4 MIs this OK [y/N]: yDownloading Packages :( 1/4): vim-minimal-7.0.109-7.2.el5.i386.rpm | 310 kB (2/
inspired by functional programming. She's actually a string of elements that support continuous, parallel aggregation operations. From the syntax, it is also very similar to the Linux pipeline, or chain programming, the code is simple and concise, very cool handsome!Viii. date/time API (JSR 310)The new Java 8 date-time API (JSR 310) is influenced by Joda-time and provides a new Java.time package that can b
method of hash value is to useExcept the remaining remainder. That is, for an array of prime numbers M, for any positive integer k, calculate the remainder of k divided by M. M is generally a prime number.2. String
When using a string as the key, we can also use it as a large integer and use the retained division method. We can hash each character value of the string, for example
Public int GetHashCode (string str) {char [] s = str. toCharArray (); int hash = 0; for (int I = 0; I The default Im
icons and splash screen, the pictures are stored in the assets directory mentioned earlier, unlike Windows 8, you can set the default size of the app, you can also set the app's 310 * 310 logo.3. functionMainly specify the system functions that the application can use, such as we need to get the user location coordinates, we need to tick the "location" function.4. DisclaimerThe main additions to the app's
Today, due to project requirements, I want to virtualize the XP system running program on the server and map the production files directly to the linux system. OK, start preparing 1. go to the VMWame official website to download the latest version of VMware-Workstation-Full-7.1.4-385536.i386.bundle (310 M) need to first register, confirm the mailbox, and then download, the evening is faster 2. download the xpsp3 image file zh-hans_windows_xp_professio
function PrintArray (arr) {for (var i in arr) {if (Arr[i] instance of Array) {PrintArray (Arr[i]);}else{document.write (arr[i]+ ");}}}var data=[1,[20,21],[[301,302],[310,[311]];PrintArray (data);After the above code is run, the page output is?Answer: 1 20 21 301 302 310 311The function PrintArray uses recursion to output each member of the array one by one, separated by a spaceThe instanceof operator is use
cursor, dynamic cursor, keyset-driven cursor Cursors are dynamic by default, and when a scrolling cursor fetches rows, the cursor reflects the most recent changes made in the result set, and to establish a static cursor, you can add the INSENSITIVE keyword after the cursor name. However, this keyword is not used in time, and when a cursor's SELECT statement has distinct, union,group by or having keyword, the way the cursor is handled is the same as the specified insensitive keyword, when the re
power of 2 includes or is not included. When carrying, we found that the low number of simple bounce, high number in the adjacent low from 1 to 0 o'clock to jump into: 0000, 0001, 0010, 0011, 0100, 0101, 0110, 0111, 1000, 1001, 1010, .... For a given binary number, the maximum possible value is that they are all 1 o'clock (the minimum value is naturally 0). And the maximum value is simply 1 less than the next power of 2: for example, 112 = 310, which
windowThe main thing in the Chat window is to send a message to the server and accept the message from the server, which is accepted by the child thread, and the code is as Follows:Class ChatFrame (wx. Frame): "" "chat window" "" def __init__ (self, parent, id, title, size): ' initialize, add control and bind event ' Wx. frame.__init__ (self, parent, id, title) self. SetSize (size) self. Center () self.chatframe = wx. Textctrl (self, pos = (5, 5), size = (490,
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