vsm mapping

Suppose we need to save the student student information, there is an address attribute in student, we know that the value of such information may be more than one, like a person will have more than two mobile phone number, this situation in hibernate should be configured as follows:To create a new address class, we assume that each student can save up to 3 addresses: Public class Address { private String addr1; Private String addr2; Private String ADDR3; // Get/set method

The entity class refers to the ordinary pojo,hibernate does not know which entity class corresponds to the database of which table, so also need to configure, the common way is the *.hbm.xml file [configuration and @ annotation configuration, here describes the former detailed properties:XML version= "1.0"?>DOCTYPE hibernate-mapping Public "-//hibernate/hibernate mapping DTD 3.0//en" "Http://www.hibernate.o

Hibernate implements a one-to-one mapping with a foreign key-based approach and a primary key-based approach. Due to the problem of the primary key mode mapping and the lack of flexibility in implementing operations such as deletion, it is generally recommended to use a foreign key-based approach.Take an example of the relationship between an individual and an identity card (mainly looking at the configurat

during scanning can improve startup time and JSP compilation time.July 11, 2016 3:49:34 pm Org.apache.catalina.core.ApplicationContext LogInfo: No Spring webapplicationinitializer types detected on ClasspathJuly 11, 2016 3:49:34 pm Org.apache.catalina.core.ApplicationContext LogInfo: Initializing Spring root WebapplicationcontextLog4j:warn No Appenders could is found for logger (org.springframework.web.context.ContextLoader).Log4j:warn Initialize the log4j system properly.Log4j:warn See http://

In Springmvc, how to handle requests is a very important task. The request map uses @requestmapping annotations. Where a label on a class is equivalent to a prefix, indicating that the processor is processing the same class of requests, and that the annotation on the method is more granular. For example, the label of a class may be "user", indicating that all actions are related to the user, and that the method may have "create", "Update", "delete", and so on, indicating what kind of action is p

Relationship between entity classes and entities: one-to-many, many-to-manyDatabase design:e_r An Entity object is a table, if it is a 1 - to-many relationship, will be the primary key of the parties to 1 to do foreign keys. Many-to-many: re-establish a new table, the two sides of the primary key to get here to do foreign keys1.a one-to-many relationship map. Examples of classes and students:1. Create class entity class and student entity class2, in class entity class with Set set properties to

1. Create an index/*** Create an index**@paramIndexName */public static voidCreateIndex (String indexname) { Delete before inserting to avoid error Boolean flag =Client.admin (). Indices (). Exists (New Indicesexistsrequest (). Indices (new string[]{indexname}). Actionget (). Isexists () ; client.admin (). Indices (). Preparedelete (IndexName). Execute (). Actionget () ; " client.admin (). Indices (). Preparecreate (IndexName). Get () ; //client.admin (). Indices (). Preparecreate (IndexNa

1. SummaryIn native Servlet development, if a URL corresponds to a servlet-mapping, then Web. XML will be very lengthy and difficult to maintain. In fact, we can actually use Filter + reflection to make a servlet handle multiple URLs and invoke different methods in the servlet based on different URLs (similar to SPRINGMVC)According to the following code implementation, you can implement user access to/test, will automatically call Frontservlet the fol

Transferred from: http://hintcnuie.iteye.com/blog/226251/The 2.4 version of the servlet specification adds a new 1 filter-mapping > 2 Filter-name > Logging filter filter-name > 3 url-pattern > /products/* url-pattern > 4 filter-mapping > In this case, the filter will function directly from the client to/products/... The request started. Because there is no default value is request.

Elasticsearch Reference [6.2]? MappingRefer to the official English document Https://www.elastic.co/guide/en/elasticsearch/reference/current/mapping.htmlMapping is the process of defining how a document and the fields it contains are stored and indexed, each with a mapping type that determines how the document will be indexed.Meta-fieldsInclude _index,_type,_id and _source fields for documentses field data type :Https://www.elastic.co/guide/en/elastic

With the development of computer technology, it is found that the simple I/O mapping method can not meet the requirements. This method is only suitable for the early computer technology, when a peripheral is usually only a few registers, through these registers can complete the external operation of all. And now the situation is not the same. For example, on a PC you can plug in an image card with 2MB of memory, or even a piece of ROM with executable

Hibernate needs to know how to load (load) and store persisted classes of objects. This is what HibernateWhere the file plays a role. The mapping file tells Hibernate which table it should access in the database(table) and which fields within the table should be used (column).The basic structure of a mapping file looks like this:If you need to look at the DTD configuration file can go to the Hibernate3.jar

There are two ways to work with relational mappings in Hibernate. One is to use the traditional XML to deal with their mapping, and the other is based on the annotation annotation method. I personally like to use annotation, I think this way seems more concise, greatly reduce the workload. The annotation package is not required to be introduced in Hibernate4 because the annotation package is already integrated.Before we go into hibernate annotation, l

Path mapping (routing) function and control of NODEJS Frame Express We know that Express is a very good service-side development framework based on NODEJS, this article Csser will provide the express framework of the route and the route control section, the route implements the URL of the client Request path mapping function, Let's translate it into a route or URL map. If you still do not understand, belie

What's the use of URL mapping? Take a more practical example, such as you develop a blog site, each blog home page loading address is Www.xxjishu.cn/Default.aspx?id=anckly The default page chooses to load the user's blog content by ID. But you need your users. You can access his blog as soon as you enter www.blog.com/anckly. This can be achieved by using the URL mapping in asp.net2.0. The principle of i

1. Mind Mapping Mind mapping, also known as mind map or brain map, is an effective graphical thinking tool to express the emission thinking, it is simple but extremely effective, is a revolutionary thinking tool. The mind map uses the technique of drawing and writing, and the relationship between the subjects of each level is represented by each other and the related level map, and the theme keywords are l

Hibernate is an open-source object-relational mapping framework that provides JDBC with a very lightweight object encapsulation that allows Java programmers to manipulate databases at will using object programming thinking. Hibernate is an excellent persistence framework What is persistence: a mechanism for converting program data between transient and persistent states Transient state: The program data of the memory exists, the program exits, the dat

Environment Mapping Another application of texture cubes is environment mapping. Environment mapping, also known as reflection mapping, is used to approximate reflective surfaces (reflective surfaces), such as a metal bumper plated on a car. The processing of environment mapping