cca175 preparation

= mysql_query("SELECT * FROM user WHERE country = ‘China‘"); if0) { ... } // 有效率的： $r = mysql_query("SELECT 1 FROM user WHERE country = ‘China‘ LIMIT 1"); if0) { ... } 4. Jianjian Index for search wordsRefer to Java interview Preparation 15: Database--Index 5. Use a fairly typed example in the Join table and index itIf your application has many join queries, you should confirm that the fields of join in two tables are indexed. In this way, M

Tags: Big Data greenplum expansionAny distributed system will have to face the matter of expansion, or the significance of the distribution system is greatly discounted, this article on the GP to expand the preparation process, in fact, the implementation of the expansion is a very simple process, the main thing to do is to prepare.Preparing to create a host information fileCreate 6 host information files with GP Administrator OS user gpadmin:

; Complete--->LVM---> Point auto-Create---> Change the partition to 20G---> Point modify---> Point save---> FinishNetwork and host---> hostname: Liu---> Application--->IP configuration--->ipv4 settings---> method: Manually add 192.168.10.7, subnet mask 24 or 255.255.255.0, Gateway 192.168.10.2---> "General"---> tick "connect automatically when available" (that is, automatically activate the network card when powered on)3. Start the installation---> set the root password to 0---> Create new user

This is one of the most basic Web project exercises, is a template is a project, which contains a table of additions and deletions function, a little change and supplement can be applied in similar Model II development of the application.Pre-Preparation:My development environment is MyEclipse 10.6+oracle 10g+tomcat 6.0+ie 8+win XP.Note: 1. The compiler aspect of Eclipse or myeclipse any version can be done without too much trouble.2. For example, I use the Oracle 10g database, in fact, the use o

accustomed to requests requests Chinese documents2.BeautifulSoup is used to parse the Web page of the module, in small crawlers have a powerful role, and easy to learn. With requests, you can easily crawl and parse Web pages. BeautifulSoup4.4.0 DocumentationIt looks like there's a lot of stuff, but it's good to get started with a few small projects. Of course, the crawler can not only these simple content, the real difficulty lies in the various anti-crawling measures to do the strategy, and th

-paged, and the physical memory is one byte less per byte of memory. So use memory in the kernel must be cautious.4.4 Do not use floating-point numbersThe kernel cannot perfectly support floating-point operations, and when using floating-point numbers, it is necessary to manually save and restore floating-point registers and other cumbersome operations.4.5 Core stack volume is small and fixedThe size of the kernel stack is determined by the time the kernel is compiled, and the size of the kernel

Finish.9. After displaying the servers (server), you can write the program.Third, first build a Web page to play.1. Right-click the webcontent in the package directory, and then new (new) a JSP file2. When naming JSP files. JSP cannot be deleted or modified3. Then write down the code in the red box, and finally press Ctrl+s to save the code, and then I'll explain the difference between the two output modes.4. Run the stage, find the file you write the code, then right click on it, then select R

, DNW the title bar will display Usb:ok, window printing informationD: From the above, we can see why learn a button or USB burn Linux?A: Switching from a wince system to a Linux systemB: Replace uboot, kernel image zimage, one or more of the file system YAFFS2C: There is a bad zone, the Development Board will not startThe difference between E:USB and one-click Burning LinuxA: The same point: The same purpose is to burn Linux into NAND. Start with SD card All through the serial

The spring environment is relatively simple to build. This section will explain a little bit.Installing and configuring the JDKThis step is to believe that the Java programmer will, open the CMD verification, as follows:Download eclipseSince Eclipse is a green version, you can use it after downloading and download the latest version here. As follows:Download the spring FrameworkThe spring website recommends using a build tool such as Maven or ant to introduce the spring framework, but to reduce

() { new UserServiceProxyFactory2 (); = factory.getuserserviceproxy (); Usproxy.save (); // To determine if a proxy object belongs to a proxied object type // the proxy object inherits the proxy object =>true // System.out.println (usproxy instanceof Userserviceimpl); // true }Results:Open the transaction! Save the user ! commit a transactionThird, the term in AOP:Joinpoint (connection point): All methods that