A detailed description of object mappings

This article mainly introduces the Hibernate mapping basic class mapping and object relational mapping, very practical value, the need for friends can refer to some of us in the absence of learning ssh, when we set up the database table, the first is the database modeling e-r diagram, Then through the entity model to establish the relationship model, and then set up the corresponding table. There are three relationships between entities, one-to-many (or many-to-two), many-to-many. And now we're going to map the table based on the class, which can only be mapped by mapping files to the relationship between classes and classes. We learn UML modeling, there are five relationships between classes and classes, inheritance, implementation, association, dependency, aggregation/composition, and the relationship between entity classes in Hibernate, and we are already familiar with the corresponding code implementations for different relationships, so the entity class is a review of knowledge. The essence of Hibernate is Object Relational mapping (Objectrelational Mapping), ORM implements the object data saved to the database, previously we work on the relational table, perform additions and deletions and other tasks, and now we are no longer on the relationship table

1. Example of hibernate two species mapping

Introduction: This article mainly introduces the Hibernate mapping basic class mapping and object relationship mapping, very practical value, the need for friends can refer to the following

2. Python's SQLAlchemy ORM sample Introduction

Introduction: ORM English Full Name Object Relational mapping, is the objects mapping relationship program, in short, we like Python this object-oriented program is all objects, but we use the database is relational, in order to ensure consistent use of the habit, By ORM, the object model of the programming language and the relational model of the database are mapped, so that we can use the programming language to manipulate the database directly using the object model of the programming language, rather than using the SQL language directly.

3. Use AutoMapper to achieve free conversion of dtos and model (medium)

Description: 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, the DTO, and the transformation rules between them. You can roll up your sleeves and start our AutoMapper tour. "Two" object mappings with zero Configuration in convention mode our addressdto and address structures are exactly the same, and the field names are exactly the same. For this type of conversion, AutoMapper provides us with convention, as it is ...

4. PHP design mode data Object mapping mode

Introduction:: This article mainly introduces the PHP design mode data Object mapping mode, for PHP tutorial interested students can refer to.

5. PHP design mode data Object mapping mode, PHP design mode _php Tutorial

Introduction: PHP design mode data Object mapping mode, PHP design mode. PHP design mode data Object mapping mode, PHP design mode data Object mapping mode, is to map objects and data storage, the operation of an object is mapped to the data stored

6. Analysis of PHP design patterns of data object mapping mode, analysis of design Patterns _php Tutorial

Introduction: Analysis of PHP design patterns of data object mapping mode, analysis of design patterns. Analysis of the Data Object Mapping mode of PHP design pattern, the design pattern PHP design pattern has a lot of various patterns, here we introduce a less commonly used data mapping

7. PHP design mode data Object mapping mode, PHP design mode

Introduction: PHP design mode data Object mapping mode, PHP design mode. PHP design mode data Object mapping mode, PHP design mode data Object mapping mode, is to map objects and data storage, the operation of an object is mapped to the data stored