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  • Spring整合hibernate的一个例子：用事务买书

    jar包：





    基本的文件框架：


    1.首先配置jdbc的连接数据，也就是db.properties

    此处注意在url上，这里不是xml文件，不需要加上amp。用一个问号就可以 

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    user=root
    password=
    driverClass=com.mysql.jdbc.Driver
    url=jdbc:mysql://localhost:3306/spring001?useUnicode=true&characterEncoding=UTF-8


    2.在    spring-config.xml 的spring容器中配置好加载db.properites的语句：

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    <context:property-placeholder location="classpath:db.properties"/>
      <!--扫描的-->
        <context:component-scan base-package="com"/>
     
     
        <!--数据源-->
        <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
            <property name="user" value="${user}"/>
            <property name="password" value="${password}"/>
            <property name="driverClass" value="${driverClass}"/>
            <property name="jdbcUrl" value="${url}"/>
        </bean>

      


    3.用idea从设计好的数据库表格生成实体类和映射文件

      BooInfo.java和Buyer.java

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    package com.entities;
     
    import javax.persistence.*;
     
    /**
     * Created by Anonymous on 2016/3/19.
     */
    @Entity
    @Table(name = "book_info", schema = "spring001")
    public class BookInfo {
        private int id;
        private String bookname;
        private Integer bookprice;
        private Integer booknum;
     
        @Override
        public String toString() {
            return "BookInfo{" +
                "id=" + id +
                ", bookname='" + bookname + ''' +
                ", bookprice=" + bookprice +
                ", booknum=" + booknum +
                '}';
        }
     
        @Id
        @Column(name = "id", nullable = false)
        public int getId() {
            return id;
        }
     
        public void setId(int id) {
            this.id = id;
        }
     
        @Basic
        @Column(name = "BOOKNAME", nullable = true, length = 255)
        public String getBookname() {
            return bookname;
        }
     
        public void setBookname(String bookname) {
            this.bookname = bookname;
        }
     
        @Basic
        @Column(name = "BOOKPRICE", nullable = true)
        public Integer getBookprice() {
            return bookprice;
        }
     
        public void setBookprice(Integer bookprice) {
            this.bookprice = bookprice;
        }
     
        @Basic
        @Column(name = "BOOKNUM", nullable = true)
        public Integer getBooknum() {
            return booknum;
        }
     
        public void setBooknum(Integer booknum) {
            this.booknum = booknum;
        }
     
    }


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    package com.entities;
     
    import javax.persistence.Basic;
    import javax.persistence.Column;
    import javax.persistence.Entity;
    import javax.persistence.Id;
     
     
    @Entity
    public class Buyer {
        private int id;
        private String user;
        private Integer money;
     
        @Id
        @Column(name = "ID", nullable = false)
        public int getId() {
            return id;
        }
     
        public void setId(int id) {
            this.id = id;
        }
     
        @Basic
        @Column(name = "USER", nullable = true, length = 255)
        public String getUser() {
            return user;
        }
     
        public void setUser(String user) {
            this.user = user;
        }
     
        @Basic
        @Column(name = "MONEY", nullable = true)
        public Integer getMoney() {
            return money;
        }
     
        public void setMoney(Integer money) {
            this.money = money;
        }
     
    }


    4.在ioc配置文件中配置好sessionFactory，在这里写好了hibernate.cfg.xml的内容，就不用生成它了。 

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    <!--hibernate的工厂-->
       <bean id="sessionFactory" class="org.springframework.orm.hibernate5.LocalSessionFactoryBean">
           <property name="dataSource" ref="dataSource"/>
           <property name="mappingLocations" value="classpath:*.hbm.xml"></property>
           <property name="hibernateProperties">
               <props>
     
                   <prop key="hibernate.format_sql">true</prop>
                   <prop key="hibernate.show_sql">true</prop>
                   <prop key="hibernate.hbm2ddl.auto">update</prop>
                   <prop key="hibernate.dialect">org.hibernate.dialect.MySQL5InnoDBDialect</prop>
     
               </props>
     
           </property>
     
       </bean>

       

    映射文件

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    <?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>
     
        <class name="com.entities.BookInfo" table="book_info" schema="spring001">
            <id name="id">
                <column name="id" sql-type="int(11)"/>
                <generator class="native"/>
            </id>
            <property name="bookname">
                <column name="BOOKNAME" sql-type="varchar(255)" not-null="true"/>
            </property>
            <property name="bookprice">
                <column name="BOOKPRICE" sql-type="int(11)" not-null="true"/>
            </property>
            <property name="booknum">
                <column name="BOOKNUM" sql-type="int(11)" not-null="true"/>
            </property>
        </class>
    </hibernate-mapping>
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    <?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>
     
        <class name="com.entities.Buyer" table="buyer" schema="spring001">
            <id name="id">
                <column name="ID" sql-type="int(11)"/>
                <generator class="native"/>
            </id>
            <property name="user">
                <column name="USER" sql-type="varchar(255)" not-null="true"/>
            </property>
            <property name="money">
                <column name="MONEY" sql-type="int(11)" not-null="true"/>
            </property>
        </class>
    </hibernate-mapping>





    5.写买书的一个接口好实现类：


    SomeActions.java   和SomeActionsImpl.java

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    package com.com.actions;
     
    /**
     * Created by Anonymous on 2016/3/19.
     */
    public interface SomeActions {
     
     
        //获取所有书本的信息
        public void getBooksInfo();
     
     
        //获取某一个本书的价格
        public int checkBookPrice(String bookName);
     
     
        //买书后更新书的数量
        public void updateBookNum(String bookName);
     
     
        //买书后更新人的钱
        public void updateBuyerMoney(String userName, int price);
     
     
    }



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    package com.com.actions;
     
    import com.entities.BookInfo;
    import com.exceptions.BookNumException;
    import com.exceptions.CheckNullException;
    import com.exceptions.MoneyCheckException;
    import org.hibernate.Query;
    import org.hibernate.Session;
    import org.hibernate.SessionFactory;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.stereotype.Repository;
     
    import java.util.Iterator;
    import java.util.List;
     
    @Repository
    public class SomeActionsImpl implements SomeActions {
     
     
        @Autowired
        private SessionFactory factory;
     
        public Session getSession() {
     
            return factory.getCurrentSession();
        }
     
        @Override
        public void getBooksInfo() {
     
            String hql = "From BookInfo";
     
            Query query = getSession().createQuery(hql);
     
            List<BookInfo> list = query.list();
     
            Iterator it = list.iterator();
            while (it.hasNext()) {
     
                BookInfo info = (BookInfo) it.next();
                System.out.println(info);
            }
        }
     
        @Override
        public int checkBookPrice(String bookName) {
     
            String hql = "select bookprice from BookInfo where bookname=:bookname";
     
            Query query = getSession().createQuery(hql);
            query.setString("bookname", bookName);
     
     
            if (query.uniqueResult() == null) {
     
                throw new CheckNullException("检索数据库中无此内容,请检查输入内容是否包含在数据库中......");
            } else {
     
     
                return (Integer) query.uniqueResult();
     
            }
     
     
        }
     
        @Override
        public void updateBookNum(String bookName) {
     
            String hql1 = "select bookprice from BookInfo where bookname=:bookname";
            int bookNum = (Integer) getSession().createQuery(hql1).setString("bookname", bookName).uniqueResult();
     
     
            if (bookNum == 0) {
     
     
                throw new BookNumException("库存不够了");
     
            }
     
     
            String hql = "update BookInfo set booknum=booknum-1 where bookname=:bookname";
     
            getSession().createQuery(hql).setString("bookname", bookName).executeUpdate();
        }
     
        @Override
        public void updateBuyerMoney(String userName, int price) {
     
            String hql1 = "select money from Buyer where user=:user";
     
            Query query = getSession().createQuery(hql1).setString("user", userName);
     
            int money = (Integer) query.uniqueResult();
     
            if (money < price) {
     
                throw new MoneyCheckException("余额不够了.....");
            }
     
            String hql = "update Buyer set money=money-:price where user=:user";
     
            getSession().createQuery(hql).setInteger("price", price).setString("user", userName).executeUpdate();
        }
    }




    6.写几个简单的继承runtimeException的类，提示出错信息：三个内容一样，就是类名不一样：


    BookNumException.java和CheckNullException.java和MoneyCheckException.java


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    package com.exceptions;
     
    /**
     * Created by Anonymous on 2016/3/19.
     */
    public class MoneyCheckException extends RuntimeException {
     
        public MoneyCheckException() {
            super();
        }
     
        public MoneyCheckException(String message) {
            super(message);
        }
     
        public MoneyCheckException(String message, Throwable cause) {
            super(message, cause);
        }
     
        public MoneyCheckException(Throwable cause) {
            super(cause);
        }
     
        protected MoneyCheckException(String message, Throwable cause, boolean enableSuppression, boolean writableStackTrace) {
            super(message, cause, enableSuppression, writableStackTrace);
        }
    }



    7.开始写事务的类，买一本书的类BuyOneBook.java

    接口与实现类

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    package com.services;
     
     
    public interface BuyOneBook {
     
        public void purchase(String buyerName, String bookName);
     
    }
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    package com.services;
     
    import com.com.actions.SomeActions;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.stereotype.Service;
     
     
    @Service
    public class BuyOneBookImpl implements BuyOneBook {
     
        @Autowired
        private SomeActions actions;
     
     
        @Override
        public void purchase(String buyerName, String bookName) {
     
            actions.getBooksInfo();
            int price = actions.checkBookPrice(bookName);
            actions.updateBookNum(bookName);
            actions.updateBuyerMoney(buyerName, price);
        }
    }



    买多本书的类，接口类与实现类：


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    package com.services;
     
    import java.util.List;
     
    /**
     * Created by Anonymous on 2016/3/19.
     */
    public interface BuySomeBooks {
     
        public void buySome(String buyerName, List<String> bookNames);
     
    }
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    package com.services;
     
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.stereotype.Service;
     
    import java.util.List;
     
     
    @Service
    public class BuySomeBooksImpl implements BuySomeBooks {
     
        @Autowired
        private BuyOneBook buyOneBook;
     
        @Override
        public void buySome(String buyerName, List<String> bookNames) {
            for (String s : bookNames) {
     
                buyOneBook.purchase(buyerName, s);
            }
     
     
        }
    }




    8.在ioc容器中配置事务方面的内容：

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    <!--事务管理器-->
        <bean id="transactionManager" class="org.springframework.orm.hibernate5.HibernateTransactionManager">
            <property name="sessionFactory" ref="sessionFactory"/>
        </bean>
     
     
        <!--配置切面，对哪些方法起作用，并且交给事务管理-->
        <tx:advice id="conn" transaction-manager="transactionManager">
            <tx:attributes>
                <tx:method name="purchase" propagation="REQUIRED"/>
                <tx:method name="get*" read-only="true"/>
                <tx:method name="*"/>
            </tx:attributes>
        </tx:advice>
     
     
        <!--配置切点，并且放到切面设置上-->
        <aop:config>
            <aop:pointcut id="pointCut" expression="execution(* com.services.*.*(..))"/>
     
            <aop:advisor advice-ref="conn" pointcut-ref="pointCut"></aop:advisor>
     
        </aop:config>



    完整的ioc文件：spring-config.xml


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    <!--事务管理器-->
        <bean id="transactionManager" class="org.springframework.orm.hibernate5.HibernateTransactionManager">
            <property name="sessionFactory" ref="sessionFactory"/>
        </bean>
     
     
        <!--配置切面，对哪些方法起作用，并且交给事务管理-->
        <tx:advice id="conn" transaction-manager="transactionManager">
            <tx:attributes>
                <tx:method name="purchase" propagation="REQUIRED"/>
                <tx:method name="get*" read-only="true"/>
                <tx:method name="*"/>
            </tx:attributes>
        </tx:advice>
     
     
        <!--配置切点，并且放到切面设置上-->
        <aop:config>
            <aop:pointcut id="pointCut" expression="execution(* com.services.*.*(..))"/>
     
            <aop:advisor advice-ref="conn" pointcut-ref="pointCut"></aop:advisor>
     
        </aop:config>



    测试类：

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    package com.test;
     
    import com.com.actions.SomeActions;
    import com.services.BuyOneBook;
    import com.services.BuySomeBooks;
    import org.junit.Test;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.context.ApplicationContext;
    import org.springframework.context.support.ClassPathXmlApplicationContext;
     
    import javax.sql.DataSource;
    import java.sql.SQLException;
    import java.util.Arrays;
     
     
    public class Main {
     
        private ApplicationContext ac = null;
     
        private BuyOneBook buyOneBook;
        private BuySomeBooks buySomeBooks;
     
        @Autowired
        private SomeActions someActions;
     
        public Main() {
     
            ac = new ClassPathXmlApplicationContext("spring-config.xml");
            buyOneBook = ac.getBean(BuyOneBook.class);
            buySomeBooks = ac.getBean(BuySomeBooks.class);
        }
     
     
        @Test
        public void testBuyOne() {
     
            buyOneBook.purchase("Tom", "西游记");
     
     
        }
     
        @Test
        public void testBuySome() {
     
            buySomeBooks.buySome("Tom", Arrays.asList("三国演义", "西游记"));
     
     
        }
     
        @Test
        public void testConnection() throws SQLException {
     
            DataSource dataSource = (DataSource) ac.getBean("dataSource");
     
            System.out.println(dataSource.getConnection());
     
        }
    }

              
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  • 原文地址：https://www.cnblogs.com/share2015/p/5297016.html
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