[s2sh]_3_hibernate与mysql还有eclipse的笔记

 暂时不写web项目，以前都是用mysql的jdbc直接连接数据库的，现在打算试试用hibernate

 hibernate官网http://www.hibernate.org/

 mysql自然要先安装起来(有一种是安装版的，有一种是解压缩版本的，解压缩版本的要自己去配置很多内容)，我用到的可视化工具叫做 mysql gui tool  还有mark一下 powerdesigner名字容易忘

 step1： 到官网下载 这是我下的版本Hibernate ORM 4.2.7.SP1 Released

 step2： 下载java 与 mysql的连接jar包 mysql官网就有http://dev.mysql.com/downloads/connector/j/

 step3:  用eclipse创建一个工程，然后把hibernate压缩包里的required文件夹里面的包导入到工程中

 step4:  把mysql的jar包导入到工程中

 step5:  在src文件夹中添加hibernate.cfg.xml文件 （主要需要做一些配置 比如 数据库的url 用户名 密码等，还有与student.hbm.xml的映射）

 step6:  创建一个javabean和与之配对的配置文件 比如 student.java student.hbm.xml  

 step7:  创建测试主函数进行测试运行即可

 hibernate.cfg.xml文件内容：

<?xml version='1.0' encoding='utf-8'?>
<!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
  <session-factory>
    <!-- Database connection settings -->
    <property name="connection.driver_class">com.mysql.jdbc.Driver</property>
    <property name="connection.url">jdbc:mysql://127.0.0.1:3306/db_weibo</property>
    <property name="connection.username">root</property>
    <property name="connection.password">123456</property>
    <!-- JDBC connection pool (use the built-in) -->
    <property name="connection.pool_size">1</property>
    <!-- SQL dialect -->
    <property name="dialect">org.hibernate.dialect.MySQLDialect</property>
    <!-- Enable Hibernate's automatic session context management -->
    <property name="current_session_context_class">thread</property>
    <!-- Disable the second-level cache  -->
    <property name="cache.provider_class">org.hibernate.cache.internal.NoCacheProvider</property>
    <!-- Echo all executed SQL to stdout -->
    <property name="show_sql">true</property>
    <!-- Drop and re-create the database schema on startup -->
    <property name="hbm2ddl.auto">update</property>
    <mapping resource="fjnu/hibernate/pojos/student.hbm.xml"/>
  </session-factory>
</hibernate-configuration>

student.hbm.xml文件内容:

<?xml version='1.0' encoding='UTF-8'?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<class name="fjnu.hibernate.pojos.student" table="TEST">
    <id name="name" column="name">
    </id>
</class>
</hibernate-mapping>

student.java内容:

package fjnu.hibernate.pojos;
public class student {
    private String name;
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public static void main(String[] args) {
        // TODO Auto-generated method stub
    }
}

test.java内容:

public class test {
    public static void main(String[] args) throws ClassNotFoundException, SQLException {
        /*
        // 驱动程序名
        String driver = "com.mysql.jdbc.Driver";
        // URL指向要访问的数据库名scutcs
        String url = "jdbc:mysql://127.0.0.1:3306/db_weibo";
        // MySQL配置时的用户名
        String user = "root";
        // MySQL配置时的密码
        String password = "123456";
         // 加载驱动程序
         Class.forName(driver);
         // 连续数据库
         Connection conn = (Connection) DriverManager.getConnection(url, user, password);
         if(!conn.isClosed())
          System.out.println("Succeeded connecting to the Database!");
         // statement用来执行SQL语句
         Statement statement = (Statement) conn.createStatement();
         // 要执行的SQL语句
         String sql = "select * from test";
         // 结果集
         ResultSet rs = statement.executeQuery(sql);
         System.out.println("-----------------");
         while(rs.next()) {
             System.out.println(rs.getString("name"));
         }*/
                                               
        Configuration configuration = new Configuration();
        configuration.configure("/hibernate.cfg.xml");
        Session session = configuration.buildSessionFactory().openSession();
        Transaction trans = session.beginTransaction();
        student s = new student();
        s.setName("hallo");
        session.save(s);
        trans.commit();
        session.clear();
    }
}

工程目录: