Spring-jdbc实现查询和事务的实现

时间 2021-01-05

五．Spring-jdbc的实现

第一步：导jar包 pom.xml


<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-beans</artifactId>
    <version>4.2.3.RELEASE</version>
</dependency>

<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-context</artifactId>
    <version>4.2.2.RELEASE</version>
</dependency>


<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-jdbc</artifactId>
    <version>4.2.0.RELEASE</version>
</dependency>

<dependency>
    <groupId>org.wisdom-framework</groupId>
    <artifactId>mysql-connector-java</artifactId>
    <version>5.1.34_1</version>
</dependency>

第二步：实体层

public class User {
    private Integer bookid;
    private String bookname;
    private Integer bookprice;

    public Integer getBookid() {
        return bookid;
    }

    public void setBookid(Integer bookid) {
        this.bookid= bookid;
    }

    public String getBookname() {
        return bookname;
    }

    public void setBookname(String bookname) {
        this.bookname= bookname;
    }

    public Integer getBookprice() {
        return bookprice;
    }

    public void setBookprice(Integer bookprice) {
        this.bookprice= bookprice;
    }
}

第三步：搭建分层

A：dao层

接口：
//01.查询素有图书
public List<User> findAll();

接口实现：需要实现接口，继承JdbcDaoSupport 植入jdbcTemplate：简化jdbc操作

public class userdaoimpextends JdbcDaoSupport implements userdao {
    // 需要植入   jdbcTemplate
    publicList<User> findAll() {
        String sql="select * from book";
        //接口的一个实现类匿名内部类
        List<User> list=this.getJdbcTemplate().query(sql,new RowMapper<User>() {
            public User mapRow(ResultSet rs,int i) throwsSQLException {
                User book=new User();
                book.setBookid(rs.getInt("bookid"));
                book.setBookname(rs.getString("bookname"));
                book.setBookprice(rs.getInt("bookprice"));
                return book;
            }
        });
        return list;
    }
    }

第四步：applicationContext.xml

实现层：

public class BookDAOImplimplements IBookService {

    //植入dao
    privateuserdao dao;

    public List<User> findAll() {
        return dao.findAll();
    }

    public userdao getDao() {
        return dao;
    }

    public void setDao(userdao dao) {
        this.dao= dao;
    }
}

接口层：

//01.查询素有图书
public List<User> findAll();

第六步：单测类

@Test
// 01.jdbctemplate
public void test02(){
    ApplicationContext ctx = new ClassPathXmlApplicationContext("applicationContext.xml");
    IBookService service = (IBookService) ctx.getBean("bookService");
    List<User> list = service.findAll();
    for (User item:list) {
        System.out.println(item.getBookname());
    }
}

事务

七：事务实现(买股票案例)

A：dao层

a:接口层

Account类：

public interface Accountdao {
    //开户方法
    public boolean add(Account account);
    //修改账户金额为true
    public boolean update(int aid,double blance,boolean isbuy);
}

股票接口：

Account接口实现类：

public interface Stockdao {
public boolean addstock(stock st);
public boolean update(int sid,int count,boolean isUser);
}

b：接口实现层：

public class Accountimp extends JdbcDaoSupport implements Accountdao

{
    public boolean add(Account account) {
        return false;
    }

    public boolean update(int aid, double blance, boolean isbuy) {
        boolean flag=false;
        String sql=null;
        if (isbuy){ //购买股票
            sql="update acount set blance=blance-? where aid=?";
        }else{
            sql="update account set blance=blance+? where aid=?";
        }
        int count = this.getJdbcTemplate().update(sql, blance, aid);
        if (count>0){
            flag=true;
        }
        return flag;
    }
}

股票接口实现类 stock：

public class Stockdaoimp extends JdbcDaoSupport implements Stockdao{

    public boolean addstock(stock st) {
        return false;
    }

    public boolean update(int sid, int count, boolean isUser) {
        boolean flag=false;
        String sql=null;
        if (isUser){
            sql="update stock set count=count+? where sid=?";
        }else{
            sql="update stock set count=count-? where sid=?";
        }
        int str = this.getJdbcTemplate().update(sql, count, sid);
        if (str>0){
            flag=true;
        }
        return flag;

    }

Service层：

接口：

public interface Accountdaoservicedao {
    //开户方法
    public boolean add(Account account);
    public boolean addstock(stock st);
    public void stock(int aid,double blance,int sid,int count) throws Exception;

}

接口实现：

public class Accountserviceimp implements Accountdaoservicedao {

    private Accountdao accountDAO;

    private Stockdao stockDAO;
    public void stock(int aid, double blance, int sid, int count) throws Exception {
        //默认是购买股票
        boolean isBuy=true;
        accountDAO.update(aid,blance,isBuy);

        //编译时异常 SPring处理方式
        //编译时 SPring事务自动提交

        //运行时   SPring 自动回滚
        if(1==1) {
            throw new StockException();
    }
        //02.股票表
        stockDAO.update(sid,count,isBuy);
    }
    public Accountdao getAccountDAO() {
        return accountDAO;
    }

    public void setAccountDAO(Accountdao accountDAO) {
        this.accountDAO = accountDAO;
    }

    public Stockdao getStockDAO() {
        return stockDAO;
    }

    public void setStockDAO(Stockdao stockDAO) {
        this.stockDAO = stockDAO;
    }

    public boolean add(Account account) {
        return false;
    }

    public boolean addstock(stock st) {
        return false;
    }

异常类：

public class StockException extends Exception {
    public StockException() {
    }

    public StockException(String message) {
        super(message);
    }
}

实体类：

Xml：

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="
        http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/aop
        http://www.springframework.org/schema/aop/spring-aop.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context.xsd">
    
    <context:property-placeholder location="jdbc.properties"></context:property-placeholder>
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="driverClass" value="${jdbc.driverClassName}"></property>
        <property name="jdbcUrl" value="${jdbc.url}"></property>
        <property name="user" value="${jdbc.user}"></property>
        <property name="password" value="${jdbc.password}"></property>
    </bean>
    <bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
        <property name="dataSource" ref="dataSource"></property>
    </bean>
    
    <bean id="Accountdao" class="Spring01tx.cn.dao.imp.Accountimp">
        <property name="jdbcTemplate" ref="jdbcTemplate"></property>
    </bean>
    <bean id="Stockdao" class="Spring01tx.cn.dao.imp.Stockdaoimp">
        <property name="jdbcTemplate" ref="jdbcTemplate"></property>
    </bean>
    
    <bean id="bookService" class="Spring01tx.cn.service.imp.Accountserviceimp">
    <property name="accountDAO" ref="Accountdao"></property>
        <property name="stockDAO" ref="Stockdao"/>
</bean>

    
    <bean id="transcationManger" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource"></property>
    </bean>
    
    <bean id="accountServiceProxy" class="org.springframework.transaction.interceptor.TransactionProxyFactoryBean">
        <property name="target" ref="bookService"></property>
        <property name="transactionManager" ref="transcationManger"></property>
        
        <property name="transactionAttributes">
            <props>
                <prop key="buy*">ISOLATION_DEFAULT,PROPAGATION_REQUIRED,-StockException</prop>
            </props>
        </property>
    </bean>
</beans>

单测：

public class test {
    @Test
    // 01.jdbctemplate
    public void test02() {
        ApplicationContext ctx = new ClassPathXmlApplicationContext("applicationContext01.xml");
        Accountserviceimp service = (Accountserviceimp) ctx.getBean("accountServiceProxy");
        try {
            //数据不匹配时的情况一个变，一个不变
            service.stock(1,1000,1,8);
        } catch (Exception e){             e.printStackTrace();         }     }