什么是JDBC？

    <!-- 1. 连接池实例 -->
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="jdbcUrl" value="jdbc:mysql://localhost:3306/hib_demo"></property>
        <property name="driverClass" value="com.mysql.jdbc.Driver"></property>
        <property name="user" value="root"></property>
        <property name="password" value="root"></property>
        <property name="initialPoolSize" value="3"></property>
        <property name="maxPoolSize" value="6"></property>
    </bean>

    public static void main(String[] args) throws IOException,
            ClassNotFoundException, SQLException, IllegalAccessException {
        
        Class.forName("com.microsoft.jdbc.sqlserver.SQLServerDriver");// 加载驱动
        Connection conn = DriverManager.getConnection(
                         "jdbc:microsoft:sqlserver://localhost:1433;DatabaseName=pubs",
                         "sa", "root");// 获取连接
        Statement sts = conn.createStatement();// 创建一个 Statement 对象来将 SQL 语句发送到数据库
        ResultSet set = sts.executeQuery("select * from t_user order by age_");// 执行sql
        System.out.println(" |用户id |姓名 |年龄 |出生日期 |email |");
        while (set.next()) {// 得到结果并输出到网页
            System.out.print(" |");
            System.out.print(set.getInt("id_") + " |");
            System.out.print(set.getString("name_") + " |");
            System.out.print(set.getInt("age_") + " |");
            System.out.print(set.getDate("birth_") + " |");
            System.out.print(set.getString("email_") + " |");
            System.out.println();
        }
        
    }