[Java知识库]Hibernate-搭建

Hibernate–搭建

结构

maven依赖【pom.xml】

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>org.example</groupId>
    <artifactId>Hibernate</artifactId>
    <version>1.0-SNAPSHOT</version>

    <properties>
        <maven.compiler.source>8</maven.compiler.source>
        <maven.compiler.target>8</maven.compiler.target>
    </properties>

    <dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.13</version>
        </dependency>
        <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-core</artifactId>
            <version>5.3.7.Final</version>
        </dependency>
        <!-- mysql 的驱动包-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.17</version>
        </dependency>

        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.16.6</version>
        </dependency>

    </dependencies>

    <build>
        <resources>
            <resource>
                <directory>src/main/java</directory>
                <includes>
                    <include>**/*.xml</include>
                </includes>
            </resource>
            <resource>
                <directory>src/main/resources</directory>
                <includes>
                    <include>**/*.xml</include>
                </includes>
            </resource>
        </resources>
    </build>
</project>

Hibernate配置文件【hibernate.cfg.xml】

<?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>
        <!-- 数据库 -->
        <property name="connection.driver_class">com.mysql.jdbc.Driver</property>
        <property name="connection.url">jdbc:mysql://localhost:3306/HibernateDemo?characterEncoding=UTF-8</property>
        <property name="connection.username">root</property>
        <property name="connection.password">root</property>

        <!-- hibernate配置 -->
        <!-- 表示输出底层的sql语句 -->
        <property name="hibernate.show_sql">true</property>
        <!-- 表示对底层的sql语句进行格式化 -->
        <property name="hibernate.format_sql">true</property>
        <!-- hibernate帮助我们自动创建表 -->
        <property name="hibernate.hbm2ddl.auto">update</property>
        <!-- 配置数据库方言，比如：在mysql里面要实现分页关键字limit,只能使用mysql里面，在oracle的数据库，实现分页rownum，让hibernate框架识别不通数据库的自己持有的语句 -->
        <property name="hibernate.dialect">org.hibernate.dialect.MySQL57Dialect</property>

        <!-- 注册实体关系映射文件-->
        <mapping resource="hbm/Hello.hbm.xml"/>
    </session-factory>
</hibernate-configuration>

实体类【Hello.java】

package pojo;

import lombok.Data;

@Data
public class Hello {
    private int id;
    private String name;
}

映射文件【Hello.hbm.xml】

<?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 package="pojo">
    <class name="Hello" table="HELLO_">

        <id name="id" column="id" type="java.lang.Integer">
            <generator class="native"/>
        </id>

        <property name="name" column="name" type="java.lang.String"/>
    </class>
</hibernate-mapping>

测试类

package test;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
import pojo.Hello;

public class test {
    public static void main(String[] args) {
        SessionFactory sf = new Configuration().configure().buildSessionFactory();
        Session session = sf.openSession();
        session.beginTransaction();

        Hello hello = new Hello();
        hello.setName("Hello World!");
        session.save(hello);
        session.getTransaction().commit();
        session.close();
        sf.close();
    }
}