hibernate(hbm.xml.jet) - Hibernate configuration file

Introduce

Generate the hibernate configuration file.

Related knowledge:

Task

Configure

Model

Model Structure

Task And Model

Model Group: shop
Model: book

The model group of the current task is shop, 
which contain a Java entity model book, 
and the relation value of book is one;

More about the model structure of this demo, please click: Demo model structure

There are 2 ways to select the model:

Select Model Group(Such as shop): <entity> tag need select the relation. This way is used in template, which require multiple models, such as many-to-one, many-to-many.

Select Model(Such as book)(This demo): <entity> tag no need to select the relation. This way is used in template, which require only one model. Of course, you can also select relation together.

Template: hbm.xml.jet
Name: ${Class}

We have created the following properties for this model:
Class: A head uppercase property, 
       which can be used as the class name or a part that need head uppercase.
       It's value is "Book".
class: A lowercase property, 
       which can be used as a part that need lowercase.
       It's value is "book".
menu: The name of the menu bar, and it's value is "Book".

Ext: The extension is hbm.xml

Initialization

Entity tag set the new variable object to get the selected model.
Set the variable table, which is the model name converted from the database table name.
Set the variable Class as the class name, get it by object.property("Class").

Generate mapping

Format:
<class name="Class" table="table">
The primary key's mapping format is:
 <id name="field.name" type="field.fullType">
   <column name="field.name" />
   <generator class="identity" /> 
 </id>
The others mapping format is:
 <property name="field.name" type="field.fullType">
   <column name="field.id" /> 
 </property>

Use for tag to iterate over fields.
Using if and else to judge. If the field is a primary key, use the primary key format; otherwise, non primary key format is used.

What's the difference between id and name?

Id is consistent with the field name of the database table, and name is the new name after the mapping.
For example, according to the database naming convention, there is a field regist_time, which is mapped to the model and then converted to registTime.

Result

Tip: isPk is used to judgment a field is a primary key. 
If true, the field is a primary key; false is a non primary key.
Here, the mouse selects the if tag in the test to see the result of the judgment.