Detailed introduction to object mapping

This article mainly introduces the basic class mapping and object relational mapping of Hibernate mapping in detail. It is of great practical value. Friends who need it can refer to it and recall some of the things we did when we didn’t learn ssh. When we created the database tables, first of all It is a database modeling E-R diagram, and then the relationship model is established through the entity model, and then the corresponding tables are established. There are three types of relationships between entities, one-to-one, one-to-many (or many-to-one), and many-to-many. Now, if we want to map the corresponding table based on the class, we can only map the database table through the relationship between classes and mapping files. We learn UML modeling. There are five relationships between classes, inheritance, implementation, association, dependency, aggregation/combination. The same is true for the relationship between entity classes in hibernate. We have implemented the code corresponding to different relationships. I am very familiar with it, so I am reviewing the knowledge about entity classes. The essence of Hibernate is Object Relational Mapping. ORM realizes saving object data into the database. In the past, we operated on the relational table and performed tasks such as addition, deletion, modification and query. Now we no longer perform

# on the relational table.

##1. Detailed explanation of examples of two types of Hibernate class mapping

Introduction: This This article mainly introduces the detailed explanation of basic class mapping and object relational mapping of Hibernate mapping, which is of great practical value. Friends who need it can refer to

2. SQLAlchemy ORM example of python Introduction

Introduction: ORM’s full name in English is object relational mapping, which is an object mapping relationship program. Simply put, we For object-oriented programs like Python, everything is an object, but the databases we use are all relational. In order to ensure consistent usage habits, a mapping relationship is established between the object model of the programming language and the relational model of the database through ORM. In this way, when we use a programming language to operate the database, we can directly use the object model of the programming language to operate instead of directly using the SQL language.

3. Use AutoMapper to achieve free conversion between Dto and Model (middle)

Introduction: Note: The code for this series of articles can be downloaded here. In the previous article, we constructed a complete application scenario, including our Model, Dto, and the conversion rules between them. Now you can roll up your sleeves and start our AutoMapper journey. [2] Implement zero-configuration object mapping in Convention mode. Our AddressDto and Address structures are exactly the same, and the field names are also exactly the same. For such type conversion, AutoMapper provides us with Convention, just like it...

4. php Design Pattern Data Object Mapping Pattern

Introduction:: This article mainly introduces the PHP design pattern Data Object Mapping Pattern. Students who are interested in PHP tutorials can refer to it.

5. php design pattern data object mapping pattern, php design pattern_PHP tutorial

Introduction: php design Pattern data object mapping pattern, PHP design pattern. PHP design pattern data object mapping mode, PHP design pattern data object mapping mode, maps objects and data storage. Operations on an object will be mapped to data storage

##6 .

A brief analysis of the data object mapping mode of the PHP design pattern, a brief analysis of the design pattern_PHP tutorial

Introduction: A brief analysis of the data object mapping mode of the PHP design pattern, A brief analysis of design patterns. A brief analysis of the data object mapping mode of PHP design patterns. A brief analysis of the design patterns. There are many various patterns in the design patterns in PHP. Here we will introduce to you a less commonly used data mapping

7.

php design pattern data object mapping mode, php design pattern

Introduction: PHP design pattern Data object mapping mode, PHP design pattern. PHP design pattern data object mapping mode, PHP design pattern data object mapping mode, is to map objects and data storage. The operation of an object will be mapped to the

of the data storage.

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