一、JdbcTemplate对象。

（1）Spring产生JdbcTemplate对象。

这个是Spring产生JdbcTemplate对象：

jdbc.properties文件:

jdbc.Driver=com.mysql.cj.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/tan
jdbc.user=root
jdbc.password=tan

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
                            http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">

    <!--数据源对象-->
    <!--
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="driverClass" value="com.mysql.cj.jdbc.Driver"/>
        <property name="jdbcUrl" value="jdbc:mysql://localhost:3306/tan"/>
        <property name="user" value="root"/>
        <property name="password" value="tan"/>
    </bean>
    -->

    <!--加载jdbc.properties-->
    <context:property-placeholder location="classpath:jdbc.properties"/>
    <!--数据源对象-->
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="driverClass" value="${jdbc.Driver}"/>
        <property name="jdbcUrl" value="${jdbc.url}"/>
        <property name="user" value="${jdbc.user}"/>
        <property name="password" value="${jdbc.password}"/>
    </bean>

    <!--jdbc模板对象-->
    <bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
        <property name="dataSource" ref="dataSource"/>
    </bean>
</beans>

public class JdbcTemplateTest {
    @Test
    //测试JdbcTemplate
    public void test1() throws PropertyVetoException {
        //获取数据源对象，并设置数据源属性
        ComboPooledDataSource dataSource = new ComboPooledDataSource();
        dataSource.setDriverClass("com.mysql.cj.jdbc.Driver");
        dataSource.setJdbcUrl("jdbc:mysql://localhost:3306/tan");
        dataSource.setUser("root");
        dataSource.setPassword("tan");
        //创建jdbcTemplate对象
        JdbcTemplate jdbcTemplate = new JdbcTemplate();
        //设置数据源（连接池）对象，知道数据库在哪
        jdbcTemplate.setDataSource(dataSource);
        //执行操作
        int row = jdbcTemplate.update("insert into account values(?,?)", "tom", 5000);
        System.out.println(row);
    }

    @Test
    //测试Spring产生jdbcTemplate对象
    public void test2(){
        ClassPathXmlApplicationContext app = new ClassPathXmlApplicationContext("ApplicationContext.xml");
        JdbcTemplate jdbcTemplate = app.getBean(JdbcTemplate.class);
        int row = jdbcTemplate.update("insert into account values(?,?)", "zhangsan", 5000);
        System.out.println(row);
    }
}

（2）JdbcTemplate常用操作。

@RunWith指定测试运行器（Runner）：

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration("classpath:ApplicationContext.xml")
public class JdbcTemplateCRUDTest {
    @Autowired
//    @Qualifier("jdbcTemplate")
    private JdbcTemplate jdbcTemplate;

    @Test
    public void testUpdate(){
        jdbcTemplate.update("update account set money = ? where name = ?", 10000, "tom");
    }

    @Test
    public void testDelete(){
        jdbcTemplate.update("delete from account where name = ?","tom");
    }

    @Test
    public void testQueryAll(){
        List<Account> accountList = jdbcTemplate.query("select * from account", new BeanPropertyRowMapper<Account>(Account.class));
        System.out.println(accountList);
    }

    @Test
    public void testQueryOne(){
        //出错，Integer.class这种就可以,因为多个数据需要封装对象
        // 原因：需要封装
//        Account tom = jdbcTemplate.queryForObject("select * from account where name = ?", Account.class, "tom");
        Account tom1 = jdbcTemplate.queryForObject("select * from account where name = ?", new BeanPropertyRowMapper<Account>(Account.class), "tom");
        System.out.println(tom1);
    }

    @Test
    public void testQueryCount(){
        //不需要封装的数据
        Long count = jdbcTemplate.queryForObject("select count(*) from account", Long.class);
        System.out.println(count);
    }
}