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  • [学习笔记] 在Eclipse中使用Hibernate,并创建第一个Demo工程,数据库为Oracle XE

    前文参考:Oracle 11g xe 在windows安装

    在Eclipse中使用Hibernate

    安装 Hibernate Tools 插件

    https://tools.jboss.org/downloads/

    Add the following URL to your Eclipse 4.13 (2019-09) installation, via:

    Help > Install New Software… > Work with:

    http://download.jboss.org/jbosstools/photon/stable/updates/

    Then select the individual features that you want to install:

    点击Next

    点击Next
    同意相关协议,点击Finish .

    则会开始下载安装。

    视网络速度,可能需要几分钟到十几分钟的时间才能完成安装。

    最后会提示重启Eclipse才能生效。

    在Eclipse中新建Hibernate应用

    File->New -> Java Project

    点击Finish

    项目结构图
    项目结构图

    在Eclipse中新建用户库

    此时下面显示了已经建立的用户库列表

    我们要添加Hibernate的依赖库,因此点击用户库

    Hibernate_4.3.5_final

    选择jar文件

    项目结构图

    继续配置Hibernate

    最后自动形成 如下的文件内容:[本例使用oracle数据库]

    Oracle 11g xe 在windows安装请看如下链接:

    Oracle 11g xe 在windows安装

    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>
            <property name="hibernate.connection.driver_class">oracle.jdbc.driver.OracleDriver</property>
            <property name="hibernate.connection.password">123456</property>
            <property name="hibernate.connection.url">jdbc:oracle:thin:@localhost:1521:xe</property>
            <property name="hibernate.connection.username">test</property>
            <property name="hibernate.default_schema">test</property>
            <property name="hibernate.dialect">org.hibernate.dialect.Oracle10gDialect</property>
        </session-factory>
    </hibernate-configuration>
    

    再增加几个属性

    配置文件更新后的内容如下: 注意要去掉name属性 更改

    <?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 >
      <property name="hibernate.connection.driver_class">oracle.jdbc.driver.OracleDriver</property>
      <property name="hibernate.connection.password">123456</property>
      <property name="hibernate.connection.url">jdbc:oracle:thin:@localhost:xe:orcl</property>
      <property name="hibernate.connection.username">test</property>
      <property name="hibernate.default_schema">test</property>
      <property name="hibernate.dialect">org.hibernate.dialect.Oracle10gDialect</property>
      <property name="hibernate.show_sql">true</property>
      <!-- 第一次加载hibernate时根据model类会自动建立起表的结构(前提是先建立好数据库),以后加载hibernate时根据 model类自动更新表结构,即使表结构改变了但表中的行仍然存在不会删除以前的行。要注意的是当部署到服务器后,表结构是不会被马上建立起来的,是要等 应用第一次运行起来后才会。 -->
      <property name="hibernate.hbm2ddl.auto">update</property> 
      <property name="hibernate.format_sql">true</property>
      <property name="hibernate.default_entity_mode">pojo</property>
     </session-factory>
    </hibernate-configuration>
    

    继续完善工程Hibernate_demo_001

    新建一个包:mytest001.demo

    在包mytest001.demo之下新建一个PO类: Emp

    package mytest001.demo;
    
    public class Emp {
    	// 员工的标识属性
    	private Integer id;
    	// 姓名
    	private String name;
    	// 年龄
    	private Integer age;
    	// 工资 (分)
    	private Integer salary;
    
    	public Integer getId() {
    		return id;
    	}
    
    	public void setId(Integer id) {
    		this.id = id;
    	}
    
    	public String getName() {
    		return name;
    	}
    
    	public void setName(String name) {
    		this.name = name;
    	}
    
    	public Integer getAge() {
    		return age;
    	}
    
    	public void setAge(Integer age) {
    		this.age = age;
    	}
    
    	public Integer getSalary() {
    		return salary;
    	}
    
    	public void setSalary(Integer salary) {
    		this.salary = salary;
    	}
    
    	@Override
    	public String toString() {
    		return "Emp [id=" + id + ", name=" + name + ", age=" + age + ", salary=" + salary + "]";
    	}
    }
    
    
    

    此刻此PO Emp.java 尚不具备持久化能力。下面为其添加注解。

    @Entity 注解声明该类是一个Hibernate持久化类
    @Table 指定该类映射的表,对应的数据库表名是T_EMP
    @Id 指定该类的标识属性,映射到数据库的主键列
    @GeneratedValue(strategy=GenerationType.SEQUENCE) 指定了主键生成策略,由于本文使用Oracle Database, 因此指定了使用 SEQUENCE

    在hibernate.cfg.xml中增加持久化映射类名

    增加一个新类:EmpManager,用于管理员工。

    package mytest001.demo;
    
    import org.hibernate.Session;
    import org.hibernate.SessionFactory;
    import org.hibernate.Transaction;
    import org.hibernate.cfg.Configuration;
    import org.hibernate.service.Service;
    import org.hibernate.service.ServiceRegistry;
    import org.hibernate.service.ServiceRegistryBuilder;
    
    
    public class EmpManager {
    
    	public static void main(String[] args)  throws Exception  {
    		 
    	//实例化配置
    	Configuration configuration  = new Configuration()
    			//不带参数则默认加载hibernate.cfg.xml
    			.configure();
    	
    	ServiceRegistry serviceRegistry = new ServiceRegistryBuilder()
    			.applySettings(configuration.getProperties()).build();
    	SessionFactory sFactory = configuration.buildSessionFactory(serviceRegistry);
    	
    	//创建session 
    	Session session = sFactory.openSession();
    	
    	//开始事务
    	Transaction tx = session.beginTransaction();
    	//创建员工对象
    	Emp emp = new Emp();
    	// 设置员工信息
    	emp.setAge(28);
    	emp.setName("scott");
    	emp.setSalary(10000);
    	session.save(emp);
    	// 提交事务
    	tx.commit();
    	session.close();
    	sFactory.close();
    			
    	
    	}
    
    }
    

    最后配置文件的内容: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 >
      <property name="hibernate.connection.driver_class">oracle.jdbc.driver.OracleDriver</property>
      <property name="hibernate.connection.password">123456</property>
      <property name="hibernate.connection.url">jdbc:oracle:thin:@localhost:1521:xe</property>
      <property name="hibernate.connection.username">test</property>
      <property name="hibernate.default_schema">test</property>
      <property name="hibernate.dialect">org.hibernate.dialect.Oracle10gDialect</property>
      <property name="hibernate.show_sql">true</property>
      <!-- 第一次加载hibernate时根据model类会自动建立起表的结构(前提是先建立好数据库),以后加载hibernate时根据 model类自动更新表结构,即使表结构改变了但表中的行仍然存在不会删除以前的行。要注意的是当部署到服务器后,表结构是不会被马上建立起来的,是要等 应用第一次运行起来后才会。 -->
      <property name="hibernate.hbm2ddl.auto">update</property> 
      <property name="hibernate.format_sql">true</property>
      <property name="hibernate.default_entity_mode">pojo</property>
      <mapping class="mytest001.demo.Emp"/>
     </session-factory>
    </hibernate-configuration>
    
    

    Emp.java

    package mytest001.demo;
    
    import javax.persistence.Entity;
    import javax.persistence.GeneratedValue;
    import javax.persistence.GenerationType;
    import javax.persistence.Id;
    import javax.persistence.Table;
    
    @Entity
    @Table(name="T_EMP")
    public class Emp {
    	// 员工的标识属性
    	@Id
    	@GeneratedValue(strategy=GenerationType.SEQUENCE)
    	private Integer id;
    	// 姓名
    	private String name;
    	// 年龄
    	private Integer age;
    	// 工资 (分)
    	private Integer salary;
    
    	public Integer getId() {
    		return id;
    	}
    
    	public void setId(Integer id) {
    		this.id = id;
    	}
    
    	public String getName() {
    		return name;
    	}
    
    	public void setName(String name) {
    		this.name = name;
    	}
    
    	public Integer getAge() {
    		return age;
    	}
    
    	public void setAge(Integer age) {
    		this.age = age;
    	}
    
    	public Integer getSalary() {
    		return salary;
    	}
    
    	public void setSalary(Integer salary) {
    		this.salary = salary;
    	}
    
    	@Override
    	public String toString() {
    		return "Emp [id=" + id + ", name=" + name + ", age=" + age + ", salary=" + salary + "]";
    	}
    }
    
    

    最后的工程结构如下:

    运行EmpManger

    十一月 23, 2019 8:50:47 上午 org.hibernate.annotations.common.reflection.java.JavaReflectionManager <clinit>
    INFO: HCANN000001: Hibernate Commons Annotations {4.0.4.Final}
    十一月 23, 2019 8:50:47 上午 org.hibernate.Version logVersion
    INFO: HHH000412: Hibernate Core {4.3.5.Final}
    十一月 23, 2019 8:50:47 上午 org.hibernate.cfg.Environment <clinit>
    INFO: HHH000206: hibernate.properties not found
    十一月 23, 2019 8:50:47 上午 org.hibernate.cfg.Environment buildBytecodeProvider
    INFO: HHH000021: Bytecode provider name : javassist
    十一月 23, 2019 8:50:47 上午 org.hibernate.cfg.Configuration configure
    INFO: HHH000043: Configuring from resource: /hibernate.cfg.xml
    十一月 23, 2019 8:50:47 上午 org.hibernate.cfg.Configuration getConfigurationInputStream
    INFO: HHH000040: Configuration resource: /hibernate.cfg.xml
    十一月 23, 2019 8:50:47 上午 org.hibernate.cfg.Configuration doConfigure
    INFO: HHH000041: Configured SessionFactory: null
    十一月 23, 2019 8:50:47 上午 org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl configure
    WARN: HHH000402: Using Hibernate built-in connection pool (not for production use!)
    十一月 23, 2019 8:50:47 上午 org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl buildCreator
    INFO: HHH000401: using driver [oracle.jdbc.driver.OracleDriver] at URL [jdbc:oracle:thin:@localhost:1521:xe]
    十一月 23, 2019 8:50:47 上午 org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl buildCreator
    INFO: HHH000046: Connection properties: {user=test, password=****}
    十一月 23, 2019 8:50:47 上午 org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl buildCreator
    INFO: HHH000006: Autocommit mode: false
    十一月 23, 2019 8:50:47 上午 org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl configure
    INFO: HHH000115: Hibernate connection pool size: 20 (min=1)
    十一月 23, 2019 8:50:48 上午 org.hibernate.dialect.Dialect <init>
    INFO: HHH000400: Using dialect: org.hibernate.dialect.Oracle10gDialect
    十一月 23, 2019 8:50:48 上午 org.hibernate.engine.transaction.internal.TransactionFactoryInitiator initiateService
    INFO: HHH000399: Using default transaction strategy (direct JDBC transactions)
    十一月 23, 2019 8:50:48 上午 org.hibernate.hql.internal.ast.ASTQueryTranslatorFactory <init>
    INFO: HHH000397: Using ASTQueryTranslatorFactory
    十一月 23, 2019 8:50:48 上午 org.hibernate.tool.hbm2ddl.SchemaUpdate execute
    INFO: HHH000228: Running hbm2ddl schema update
    十一月 23, 2019 8:50:48 上午 org.hibernate.tool.hbm2ddl.SchemaUpdate execute
    INFO: HHH000102: Fetching database metadata
    十一月 23, 2019 8:50:48 上午 org.hibernate.tool.hbm2ddl.SchemaUpdate execute
    INFO: HHH000396: Updating schema
    十一月 23, 2019 8:50:48 上午 org.hibernate.tool.hbm2ddl.DatabaseMetadata getTableMetadata
    INFO: HHH000262: Table not found: T_EMP
    十一月 23, 2019 8:50:48 上午 org.hibernate.tool.hbm2ddl.DatabaseMetadata getTableMetadata
    INFO: HHH000262: Table not found: T_EMP
    十一月 23, 2019 8:50:48 上午 org.hibernate.tool.hbm2ddl.DatabaseMetadata getTableMetadata
    INFO: HHH000262: Table not found: T_EMP
    十一月 23, 2019 8:50:48 上午 org.hibernate.tool.hbm2ddl.SchemaUpdate execute
    INFO: HHH000232: Schema update complete
    Hibernate: 
        select
            test.hibernate_sequence.nextval 
        from
            dual
    Hibernate: 
        insert 
        into
            test.T_EMP
            (age, name, salary, id) 
        values
            (?, ?, ?, ?)
    十一月 23, 2019 8:50:48 上午 org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl stop
    INFO: HHH000030: Cleaning up connection pool [jdbc:oracle:thin:@localhost:1521:xe]
    
    

    到数据库中查询表:(这个表会被自动创建)
    select * from t_emp;

    如果再次运行会增加新的记录。

    至此,本文完成。

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  • 原文地址:https://www.cnblogs.com/abc789/p/11915224.html
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