How to configure the Hibernate environment in Java

1.hibernate mapping configuration

class tag, used to establish the relationship between classes and tables name: class name, table: table name

id tag , establish the corresponding relationship between the properties in the table and the primary key in the table

property, establish the corresponding relationship between the ordinary properties in the class and the fields of the table

(1) First we must learn how to write mapping Configuration file, everyone must know that the written mapping configuration file should be in the same package as the entity class, and the name should be class name.hbm.xml, so we need to create a Customer under the com.meimeixia.hibernate.demo01 package. hbm.xml file, but how should its constraints be written? You can find the hibernate-mapping-3.0.dtd file under the org.hibernate package of Hibernate's core jar package - hibernate-core-5.0.7.Final.jar.

(2) Copy and paste it into the Customer.hbm.xml file. The content of the Customer.hbm.xml file is given here first, but the content will not be introduced too much:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC
    "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
    "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
    
<hibernate-mapping>
<!-- 建立类与表的映射 -->
<class name="com.meimeixia.hibernate.demo01.Customer" table="cst_customer">
<!-- 建立类中的属性与表中的主键相对应 -->
<id name="cust_id" column="cust_id">
<!-- 主键的生成策略，后面会讲，现在使用的是本地生成策略 -->
<generator />
</id>
<!-- 建立类中的普通属性和表中的字段相对应 -->
<property name="cust_name" column="cust_name" />
<property name="cust_source" column="cust_source" />
<property name="cust_industry" column="cust_industry" />
<property name="cust_level" column="cust_level" />
<property name="cust_phone" column="cust_phone" />
<property name="cust_mobile" column="cust_mobile" />
</class>
</hibernate-mapping>

2.hibernate core configuration

Required configuration: Basic parameters for connecting to the database: driver class, URL path, user name, password, dialect configuration and introduction of mapping files

Optional configuration of displayed SQL statements, formatted SQL statements, and automatic table creation

(1) The core configuration file is mainly used by the Hibernate framework. It mainly contains information related to connecting to the database and Hibernate related configurations. Now we need to learn how to write Hibernate's core configuration file. Everyone must also know that the written core configuration file should be in the src directory, and its name should be hibernate.cfg.xml, so we need to create a hibernate.cfg in the src directory. .xml file, but how should its constraints be written? You can also find the hibernate-configuration-3.0.dtd file

(2) under the org.hibernate package of Hibernate's core jar package - hibernate-core-5.0.7.Final.jar and then copy and paste it. Just go to the hibernate.cfg.xml file. How should it be configured in this file? We can refer to the hibernate-release-5.0.7.Final\project\etc\hibernate.properties file. The content of the hibernate.cfg.xml file is given here first, but the content will not be introduced too much:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<!-- 下面是三个必须要有的配置 -->
<!-- 配置连接MySQL数据库的基本参数 -->
<property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="hibernate.connection.url">jdbc:mysql:///hibernate_demo01</property>
<property name="hibernate.connection.username">root</property>
<property name="hibernate.connection.password">liayun</property>
<!-- 配置Hibernate的方言 -->
<property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
<!-- 下面两个是可选的配置哟！ -->
<!-- 打印sql语句 -->
<property name="hibernate.show_sql">true</property>
<!-- 格式化sql语句 -->
<property name="hibernate.format_sql">true</property>
<!-- 告诉Hibernate的核心配置文件加载哪个映射文件 -->
<mapping resource="com/meimeixia/hibernate/demo01/Customer.hbm.xml"/>
</session-factory>
</hibernate-configuration>

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