解析Spring第四天（Spring中的事物、Spring框架来管理模板类）

JDBC模板技术：
Spring框架中提供了很多持久层的模板类来简化编程，使用模板类编写程序会变的简单
- template 模板
- 都是Spring框架提供XxxTemplate
提供了JDBC模板，Spring框架提供的
- JdbcTemplate类，Connection 表示连接，管理事务 Statement ResultSet
如何使用JDBC模板类？

在数据库中新增表结构和数据

 1 DROP TABLE IF EXISTS `account`;
 2 CREATE TABLE `account` (
 3   `id` int(11) NOT NULL AUTO_INCREMENT,
 4   `name` varchar(40) DEFAULT NULL,
 5   `money` double DEFAULT NULL,
 6   PRIMARY KEY (`id`)
 7 ) ENGINE=InnoDB AUTO_INCREMENT=7 DEFAULT CHARSET=utf8;
 8 
 9 -- ----------------------------
10 -- Records of account
11 -- ----------------------------
12 INSERT INTO `account` VALUES ('1', 'aaa', '1000');
13 INSERT INTO `account` VALUES ('2', 'bbb', '1000');
14 INSERT INTO `account` VALUES ('3', 'ccc', '1000');
15 INSERT INTO `account` VALUES ('4', '熊大', '700');
16 INSERT INTO `account` VALUES ('5', '熊二', '1200');
17 INSERT INTO `account` VALUES ('6', '熊三', '800');

创建一个普通的Maven工程，引入坐标

 1 <dependencies>
 2     <dependency>
 3         <groupId>org.springframework</groupId>
 4         <artifactId>spring-context</artifactId>
 5         <version>5.0.2.RELEASE</version>
 6     </dependency>
 7     <dependency>
 8         <groupId>commons-logging</groupId>
 9         <artifactId>commons-logging</artifactId>
10         <version>1.2</version>
11     </dependency>
12     <dependency>
13         <groupId>log4j</groupId>
14         <artifactId>log4j</artifactId>
15         <version>1.2.12</version>
16     </dependency>
17     <dependency>
18         <groupId>junit</groupId>
19         <artifactId>junit</artifactId>
20         <version>4.12</version>
21     </dependency>
22     <dependency>
23         <groupId>org.springframework</groupId>
24         <artifactId>spring-test</artifactId>
25         <version>5.0.2.RELEASE</version>
26     </dependency>
27     
28     <dependency>
29         <groupId>aopalliance</groupId>
30         <artifactId>aopalliance</artifactId>
31         <version>1.0</version>
32     </dependency>
33     <dependency>
34         <groupId>org.springframework</groupId>
35         <artifactId>spring-aspects</artifactId>
36         <version>5.0.2.RELEASE</version>
37     </dependency>
38     <dependency>
39         <groupId>org.aspectj</groupId>
40         <artifactId>aspectjweaver</artifactId>
41         <version>1.8.13</version>
42     </dependency>
43     <dependency>
44         <groupId>mysql</groupId>
45         <artifactId>mysql-connector-java</artifactId>
46         <version>5.1.6</version>
47     </dependency>
48     <dependency>
49         <groupId>org.springframework</groupId>
50         <artifactId>spring-jdbc</artifactId>
51         <version>5.0.2.RELEASE</version>
52     </dependency>
53     <dependency>
54         <groupId>org.springframework</groupId>
55         <artifactId>spring-tx</artifactId>
56         <version>5.0.2.RELEASE</version>
57     </dependency>
58   </dependencies>

使用Spring框架来管理模板类，Spring管理内置的连接池

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <beans xmlns="http://www.springframework.org/schema/beans"
 3        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 4        xmlns:context="http://www.springframework.org/schema/context"
 5        xmlns:aop="http://www.springframework.org/schema/aop"
 6        xsi:schemaLocation="
 7                 http://www.springframework.org/schema/beans
 8                 http://www.springframework.org/schema/beans/spring-beans.xsd
 9                 http://www.springframework.org/schema/context
10                 http://www.springframework.org/schema/context/spring-context.xsd
11                 http://www.springframework.org/schema/aop
12                 http://www.springframework.org/schema/aop/spring-aop.xsd">
13 
14     <!--配置连接池-->
15     <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
16         <property name="driverClassName" value="com.mysql.jdbc.Driver" />
17         <property name="url" value="jdbc:mysql:///spring_db" />
18         <property name="username" value="root" />
19         <property name="password" value="root" />
20     </bean>
21 
22     <!--配置jdbc模板-->
23     <bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
24         <property name="dataSource" ref="dataSource" />
25     </bean>
26 
27 </beans>

测试jdbcTemplate

 
package cn.tx.test;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;


@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(value = "classpath:applicationContext_jdbc.xml")
public class Demo1_1 {

    @Autowired
    private JdbcTemplate jdbcTemplate;

    /**
     * 测试的方式
     */
    @Test
    public void run1(){
        jdbcTemplate.update("insert into account values (null,?,?)","熊二",500);
    }

}

Spring框架管理开源的连接池

配置开源的连接池，使用Druid的连接池，引入坐标

<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>druid</artifactId>
    <version>1.1.10</version>
</dependency>

新建一个属性文件后缀为.properties。配置连接数据库的基本信息

1 jdbc.driverClassName=com.mysql.jdbc.Driver
2     jdbc.url=jdbc:mysql:///spring_db
3     jdbc.username=root
4     jdbc.password=root

在xml的文件中配置读取属性文件，连接数据库和配置jdbc模板

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <beans xmlns="http://www.springframework.org/schema/beans"
 3        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 4        xmlns:context="http://www.springframework.org/schema/context"
 5        xmlns:aop="http://www.springframework.org/schema/aop"
 6        xsi:schemaLocation="
 7                 http://www.springframework.org/schema/beans
 8                 http://www.springframework.org/schema/beans/spring-beans.xsd
 9                 http://www.springframework.org/schema/context
10                 http://www.springframework.org/schema/context/spring-context.xsd
11                 http://www.springframework.org/schema/aop
12                 http://www.springframework.org/schema/aop/spring-aop.xsd">
13 
14     <!--配置连接池，使用的是Spring框架内置的连接池
15     <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
16         <property name="driverClassName" value="com.mysql.jdbc.Driver" />
17         <property name="url" value="jdbc:mysql:///spring_db" />
18         <property name="username" value="root" />
19         <property name="password" value="root" />
20     </bean>
21     -->
22 
23     <!--使用开源连接池
24     <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
25         <property name="driverClassName" value="com.mysql.jdbc.Driver" />
26         <property name="url" value="jdbc:mysql:///spring_db" />
27         <property name="username" value="root" />
28         <property name="password" value="root" />
29     </bean>
30     -->
31 
32     <!--加载属性文件
33     <bean id="placeholderConfigurer" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
34         <property name="location" value="classpath:jdbc.properties" />
35     </bean>
36     -->
37 
38     <!--第二种写法：使用提供标签的方式-->
39     <context:property-placeholder location="classpath:jdbc.properties" />
40 
41     <!--加载属性的文件-->
42     <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
43         <property name="driverClassName" value="${jdbc.driverClassName}" />
44         <property name="url" value="${jdbc.url}" />
45         <property name="username" value="${jdbc.username}" />
46         <property name="password" value="${jdbc.password}" />
47     </bean>
48 
49     <!--配置jdbc模板-->
50     <bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
51         <property name="dataSource" ref="dataSource" />
52     </bean>
53 
54 </beans>

对数据的基本操作做测试，增删改查

package cn.tx.test;

import cn.tx.demo1.Account;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.core.RowMapper;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.List;


@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(value = "classpath:applicationContext_jdbc.xml")
public class Demo1_1 {

    @Autowired
    private JdbcTemplate jdbcTemplate;

    /**
     * 测试的方式
     */
    @Test
    public void run1(){
        jdbcTemplate.update("insert into account values (null,?,?)","熊四",800);
    }

    /**
     * 修改
     */
    @Test
    public void run2(){
        jdbcTemplate.update("update account set name = ?,money = ? where id = ?","光头强",100,7);
    }

    /**
     * 删除
     */
    @Test
    public void run3(){
        jdbcTemplate.update("delete from account where id = ?",7);
    }

    /**
     * 通过id查询
     */
    @Test
    public void run4(){
        Account account = jdbcTemplate.queryForObject("select * from account where id = ?", new BeanMapper(), 6);
        System.out.println(account);
    }

    /**
     * 查询所有的数据
     */
    @Test
    public void run5(){
        List<Account> list = jdbcTemplate.query("select * from account", new BeanMapper());
        for (Account account : list) {
            System.out.println(account);
        }
    }

}

/**
 * 实现类，用来进行数据封装的
 */
class BeanMapper implements RowMapper<Account>{

    /**
     * 是一行一行进行数据封装的
     * @param resultSet
     * @param i
     * @return
     * @throws SQLException
     */
    @Override
    public Account mapRow(ResultSet resultSet, int i) throws SQLException {
        Account account = new Account();
        account.setId(resultSet.getInt("id"));
        account.setName(resultSet.getString("name"));
        account.setMoney(resultSet.getDouble("money"));
        return account;
    }

}

解析Spring第四天（Spring中的事物、Spring框架来管理模板类）

Spring框架管理开源的连接池

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