Spring-JdbcTemplate-春天的故事5

spring JdbcTemplate使用

• 1、引包
  

除了引入spring配置的相关包，还需引入数据配置相关的包。

<dependency>
          <groupId>c3p0</groupId>
          <artifactId>c3p0</artifactId>
          <version>0.9.1.2</version>
      </dependency>
      <dependency>
          <groupId>mysql</groupId>
          <artifactId>mysql-connector-java</artifactId>
          <version>5.1.18</version>
      </dependency>

• 2、spring配置文件

数据库配置文件 db.properties

jdbc.user=root
jdbc.password=123456
jdbc.driverClass=com.mysql.jdbc.Driver
#本地创建的数据库名hibernate(任意名)
jdbc.url=jdbc:mysql:///hibernate

jdbc.initPoolSize=5
jdbc.maxPoolSize=10

spring配置文件 applicationContext3.xml

<?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">

    <context:property-placeholder location="classpath:db.properties"></context:property-placeholder>

    <!--配置c3p0数据源-->
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="user" value="${jdbc.user}"></property>
        <property name="password" value="${jdbc.password}"></property>
        <property name="jdbcUrl" value="${jdbc.url}"></property>
        <property name="driverClass" value="${jdbc.driverClass}"></property>
        <property name="initialPoolSize" value="${jdbc.initPoolSize}"></property>
        <property name="maxPoolSize" value="${jdbc.maxPoolSize}"></property>
    </bean>

    <bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
        <property name="dataSource" ref="dataSource"></property>
    </bean>


    </beans>

• 3、简单使用

public class Main {
    private JdbcTemplate jdbcTemplate;

    {
        ApplicationContext applicationContext=new ClassPathXmlApplicationContext("applicationContext3.xml");
        jdbcTemplate= (JdbcTemplate) applicationContext.getBean("jdbcTemplate");
    }

    @Test
    public void testUpdate(){
        String sql="update news set author=? where id=?";
        jdbcTemplate.update(sql,"jack",1);
    }

    /**
     * RowMapper指定如何去映射完成结果集的行，常用实现类BeanPropertyRowMapper
     * 
     */
    @Test
    public void  testQueryForObject(){
        String sql="select * from news where id=?";
        RowMapper<News> rowMapper=new BeanPropertyRowMapper<News>(News.class);
        News news=jdbcTemplate.queryForObject(sql,rowMapper,1);
        System.out.println(news);
    }
}