espatial mapping

The day before yesterday made a moderate error, because the properties of the upper-level mapping is not deleted, directly modified SQL, resulting in data mapping dislocation, and then data anomalies. I think this kind of mistake, it was thought of, but the mistake happened. Then think about it, the original Java has similar things, ORM mapping. At that time did

Next, let's talk about ORM ing in Orm today. If you want to experience the strength of Nhibernate, you must first learn the configuration, including the configuration of sessionfactory and mapping. Today, like the previous article, we will use the traditional method and nhib.pdf to explain it. If you want to test it by yourself, you can first take a look at "fluent nhib.pdf journey 1" to prepare the database and sessionfactory. Content of this section

Document directory What is O/R Mapping? Why O/R Mapping? How to perform O/R Mapping? English document The purpose of this article is to understand what O/R Mapping is, Why O/R Mapping is required, and how O/R Mapping is pe

binding. Disadvantage: the client must obtain data through a set. There is no type, the instantiation overhead is large, and the scheduling performance is low. ④ Advantages of Typed Dataset be: the type can be checked. Disadvantage: it can only be inherited from dataset, which is inconvenient to deploy, poor scalability, high instantiation overhead, and low Scheduling Performance. ⑤ Custom be advantages: Performance Tuning and code readability. You can use a custom object class to define a good

Mapping TypeWhen you prepare a Hibernate mapping file, we have seen you map the Java data type to the RDBMS data format. The types that have been declared to be used in the mapping file are not Java data types, nor are they SQL database types. This type is known as the Hibernate mapping type, which can be translated fr

What is the relationship, what is the mapping, the word of the relationship must be no stranger to everyone. For example, you and the teacher is the relationship between teachers and students, you and your parents are father or daughter (mother or daughter relationship).Relationships are created between some kind of connected object. Anything is possible. For example, you and the tool, you can only use the tool, but the tool can not use you. This rela

write and view of mappingFirst create an index:-XPOST "http://127.0.0.1:9200/productindex"{"acknowledged":true} Now only one index is created, and the mapping is not set to look at the contents of the index mapping:-XGET "http://127.0.0.1:9200/productindex/_mapping?pretty" { "productindex" : { "mappings" : { } }}You can see that mapping is empty, we have cr

MyBatis really powerful in mapping statements, focus on SQL, powerful, SQL map configuration is quite simpleSo let's take a look at the specific structure of the mapping fileFirst, the XML node structureMapper as root node-namespace namespaceCache-Configure caching for a given namespacecache-ref– referencing cache configuration from other namespacesResultmap– used to describe the correspondence between a da

????? In the previous article, we mapped a single entity class through the annotation pair, but the entity classes are related to each other in the project, this article is the different relation angle from the entity class, the specific learning how to map their association, the main content is as follows: One-way relational mapping A one-way, many-to-one correlation relationship mapping O

--> --> Hibernate o/R mapping three basic rule 1. Introduction In the Java environment, there are a variety of object-relational mapping methods, such as entity beans, OJB, JDO, JDBC, and so on. Hibernate is a new O/R mapping tool that not only provides mappings from Java classes to datasheets, but also provides mechanisms for querying and restoring data. Hib

The previous article discusses a one-to-many mapping in detail, and there are a lot of problems with unidirectional mappings in a pair of mappings, so it is not recommended to use a two-way association to optimize the relationship if one-to-many mappings are to be considered, which is essentially using one, one-way many-to-many Still in accordance with the previous article format to discuss, first of all, the relationship between the object, a one-w

Open Source Entity Mapping Framework Emitmapper Introduction Review Emitmapper is an open source entity mapping Framework, Address: http://emitmapper.codeplex.com/. Emitmapper mapping efficiency is relatively high, close to hard coding. Emitmapper uses emit mode to generate IL dynamically at runtime, while other

I have not seen the MATLAB has a class dict structure, this can not but say is a kind of regret. Of course, this superficial understanding, also let me earlier and Julia knot the fate, gain it. From 2010 to 2013, I was mainly using MATLAB, such as DataSet (=>table) and other data structures (Matrix, cell,struct). Recently saw a lot of people in writing related articles, specially turn, for Matlab feel happy. In fact, the dict structure of MATLAB is also some, is Hou Wei matlab should be correcte

(Image mosaic of the project to use texture mapping, with OpenCV cvwarpperspective too slow, consider using look-up table mapping to improve)Baidu to the following content, spare: Turn from: http://www.cnblogs.com/wangguchangqing/p/4039095.html 1. Basic concepts of geometric transformations 1.1 Coordinate mapping relationship The geometric transformation of the

First, the basic concept of mapping modeThe mapping mode is a Device Description table property that determines how the logical coordinate value is converted to the device coordinate value. The logical coordinate value that is passed to the CDC output function. The device coordinate value refers to the corresponding pixel point position in the window.Mm_text is the default

One: Kmap () and Kunmap () functionsPermanent kernel mapping allows the kernel to establish long-term mappings of high-end page frames to the kernel address space. He uses a dedicated page table in the main kernel page table whose page table addresses are stored in pkmap_page_table, and the page table contains 512 or 1024 items.Therefore, the kernel accesses up to 2M or 4 m of high-end memory at a time (the address range is between 4g-8m and 4g-4m, wh

Hibernate Mapping file in detail2010-09-02 19:03:33| Category: Hibernate learning | Report | Font size Subscription The mappings between Hibernate's persistence classes and relational databases are usually defined with an XML document. The document establishes a one by one mapping between a persisted class and a database table through the configuration of a series of XML elements. This means that the

In the previous article we wrote about a One-to-many association mapping, which is the basis for a Many-to-many association mapping. Many-to-many Association mappings are also one of our most common association mappings. The principle of Many-to-many Association mapping is to maintain a many-to-many relationship between two objects through a third table, and to a

The SQL mapping file has a few top-level elements (in the order that they should be defined below). Cache-Configure caching for a given namespace cache-ref– references the cache configuration from other namespaces. Resultmap– is the most complex and powerful element to describe how to load your objects from a database result set. parametermap– has been abandoned! Vintage-style parametric mappi