qbe meaning

= null; Transaction ts = session.begintransaction (); try { criteria = Session.createcriteria (user.class); Criteria.add (Restrictions.eq ("name", "Ijse")); User= (User) criteria.list (). get (0); Session.commit (); } catch (Hibernateexception ex) { ts.rollback (); Ex.printstacktrace (); } System.out.println (User.getname ());　　QBE (query by Example) Query methodQueries a non-empty property of an object as a query conditio

I started to use two exclude and found that the query was invalid. Today I checked the source code and confirmed that it could not be used at the same time. I feel that this is a design problem and may not pay much attention to this QBE. There are three solutions: one is to design your ownCodeGenerate a template to generate a class that meets the requirements. In addition, it is difficult to rewrite NH. Finally, we used reflection to set the ignore

) method, parameters using Restrictions object Public list6. QBC (Query by Criteria) method, parameters use object binding Public listThe key abstract objects used by the PS:QBC (Query by Criteria) are:Restrictions--set query throttling conditionsOrder--Set query sort criteriaProjections---the tools class methods are counted and grouped.The above 5-6 is also my favorite way to use object-oriented query to cater to object-oriented programming.7. Offline Conditional QueryPublic listThe benefits

Hibernate query method (HQL/QBC/QBE) Summary, hqlqbc As an old ORM framework, Hibernate has made significant contributions to promoting the database persistence layer. It provides more and more data query methods, from SQL to self-built HQL, To object-oriented standardized query. Although the query method is a little dazzling, the configuration is a little complicated to use. But it cannot cover up its charm at all. This blog attempts to summarize all

find the total of a property Example: 1:session Session = Sessionfactory.getcurrentsession (); 2:user User = null; 3:transaction ts = session.begintransaction (); try { 5: Criteria = Session.createcriteria (User. Class); 6: Criteria.add (Restrictions.eq ("name","Ijse")); 7: user= (user) Criteria.list (). get (0); 8: session.commit (); catch (Hibernateexception ex) { Ten: ts.rollback (); One: ex.printstacktrace (); 12:} 13:system.out.

())); Detachedcriteria.add (restrictions.eq ("passwd", userpo.getpasswd ())); = Detachedcriteria.getexecutablecriteria (getsession ()); return criteria.list (); }The benefits of offline querying, You can pass query object Detachedcriteria as a parameter to the DAO layer, reducing the DAO layer code8. QBC (query by Criteria) method, Paging inquiry public list getuserlist (userpo userpo) { = getsession (). createcriteria (userpo. Class); Criteria.setfir

order of a property value, simply fill in the corresponding column. AO.?Sort Descending:Sort by descending? Do.Sort multiple columns:If you sort by multiple columns, use the? AO (i).? Or? Do (i).? Indicates that I is the priority of the sort, the lower the I value, the higher the priority levelCheck the names of all the boys, the query results are ordered in ascending order of the department , and the students of the same department are sorted by age.Modify Operationtwo lines representing the p

[Go] Return html tags for their original meaning, and html tags for their meaning To tell the truth, the word "div + css" does not know how many people are harmed. Maybe the author's intention is correct, but the followers have misinterpreted its meaning in terms of performance, the whole page should be a combination of div + css files. In this way, there is no v

The recent use of curl feeling is still very convenient, looked at the cookie file format of curl generated, some of the value of the meaning is not very clear, to find some information about the cookie looked down, do a memo The cookie file format generated by PHP Curl is as follows #Netscape HTTP Cookie File#http://curl.haxx.se/rfc/cookie_spec.html#This file is generated by libcurl! Edit at your own risk.Jifen. xx.comFALSE/FALSE0PHPSESSID Dmdvk314ru

When the search engine grasps the lifeblood of the Internet economy, the typical application of the Internet, which is created by the search behavior, will affect all the people and things related to it. For the moment, we call the economic model of the related behavior a search economy. In this section we discuss one of the most basic elements of a search economy – search keywords. What are the key words? It can be any word in any language, mainly in the form of words. The essence of writing i

Chapter eighth Introduction to object-oriented programmingThe contents of this chapter:What is object-oriented programmingOOP technologyThe Windows forms application's dependency on OOP8.1 Meaning of object-oriented programmingThe programming method described earlier, called function (or procedural) programming, often leads to so-called single applications, where all functions are contained in several code modules (often a code module). with OOP, many

Android Log Tag meaning, androidlogtag meaning One of the most important methods to analyze Android problems is to analyze logs in events. there are many system logs in the log, some of which are not very familiar with the meaning. The following is the system log tag obtained from the android source code. The Tag description is as follows: "30005 am_create_activi

The meaning of directory and file permissions in Linux The meaning of file permission R: You can read the specific contents of this document; W: You can edit the contents of this file, including adding the details of the deleted file; X: The file has executable permissions-------Note: Here and window is not the same, in win, the file executable permissions are expressed through the extension, such as EX

Where T: class meaning, whereclass meaning public class DbEntityEntry This is a parameter type constraint. The specified T must be of the Class type. . NET supports the following types of parameter constraints:Where T: struct | T must be a structure typeWhere T: class | T must be of the Class typeWhere T: new () | T must have a non-argument ConstructorWhere T: NameOfBaseClass | T must inherit the class nam

Linux basic [Folder meaning], linux basic meaning The linux File directory is a tree directory. Bin --> Executable File Boot --> operating system boot file, system kernel, boot Information Dev --> device, device information, computer hardware device information Etc --> System Configuration directory Home --> home Directory, user folder Root --> super administrator folder with the highest Permissions

What is the definition in C language? What is the meaning of the statement? What is the difference between them ?, Meaning difference In the C language, we may be very familiar with definitions and declarations, but we may not really understand them! Definition meaning: the so-called definition is to create (compiler) an object, allocate a memory space for this

String formatting symbolic meaning Symbol Description %c Formatting characters and their ASCII code %s formatting strings %d formatting integers %o Formatting an unsigned octal number %x formatting unsigned hexadecimal numbers %x Format unsigned hexadecimal number (uppercase) %f Format fixed-point numb

String formatting symbolic meaning Symbol Description %c Formatting characters and their ASCII code %s formatting strings %d formatting integers %o Formatting an unsigned octal number %x formatting unsigned hexadecimal numbers %x Format unsigned hexadecimal number (uppercase) %f Format fixed-point numb

A lot of friends in the tuning with MySQL will certainly use the explain to see the execution of the SELECT statement, here is a brief introduction to the results of the meaning of the two columns.1 Type column The official saying that this column represents the "type of access", and more commonly, the way MySQL finds the data rows needed. One is to introduce the worst from the most efficient to the best: all this is called a full-table scan, and no i

A lot of friends in the tuning with MySQL will certainly use the explain to see the execution of the SELECT statement, here is a brief introduction to the results of the meaning of the two columns.1 Type column The official saying that this column represents the "type of access", and more commonly, the way MySQL finds the data rows needed. One is to introduce the worst from the most efficient to the best: all this is called a full-table scan, and no i