【Spring】【JDBC模版】

一、搭建环境

1.引入JAR包。数据库驱动，spring的基础包，spring的jdbc包

2.新建XML文件

二、使用JDBC模版

1.使用DBCP

<?xml version="1.0" encoding="UTF-8"?>
<beans 
xmlns="http://www.springframework.org/schema/beans"
	xmlns:p="http://www.springframework.org/schema/p"
    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"
>

<!-- 增加DriverManagerDataSouerce -->
<!--  DBCP -->
<bean id="dataSouerce" class="org.apache.commons.dbcp.BasicDataSource">
<property name="driverClassName" value="com.mysql.jdbc.Driver"/>
		<property name="Url" value="jdbc:mysql:///spring4_day03"/>
		<property name="username" value="root"/>
		<property name="password" value="a"/>
</bean>
<!--  C3P0-->
<!--  <bean id="dataSouerce" class="com.mchange.v2.c3p0.ComboPooledDataSource">
<property name="driverClass" value="com.mysql.jdbc.Driver"/>
		<property name="jdbcUrl" value="jdbc:mysql:///spring4_day03"/>
		<property name="user" value="root"/>
		<property name="password" value="a"/>
</bean>
 -->
<!-- 增加JDBCTemplate -->
<bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
<property name="dataSource" ref="dataSouerce"></property>
</bean>





</beans>

三、使用属性文件配置

1.创建属性文件jdbc.properties

2.写入

DriverClassName=com.mysql.jdbc.Driver
url=jdbc:mysql:///数据库名
username=root
password=密码

3.XML中引入context标签。还有beans标签的配置

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

四、JDBC模版增删改查的使用

//query
	@Test
	public void test4() {
		long count = jdbcTemplate.queryForObject("select count(*) from account", Long.class);
		System.out.println("query count = " + count);
	}
	//query a record to object
	@Test
	public void test5() {
		
		try {
			Account account = (Account) jdbcTemplate.queryForObject("select id,name,money from account where id = ?", new MyRowMap(),20);
		} catch (Exception e) {
			// TODO: handle exception
			System.out.println(e.getMessage());
		}
	
	}
	//query more records to list
	@Test
	public void test6() {
		List<Account> list = jdbcTemplate.query("select * from account", new MyRowMap());
		for (Account account : list) {
			System.out.println(account);
		}
	}
	//必须写一个内部类，继承RowMapper接口
	class MyRowMap  implements RowMapper{

		@Override
		public Account mapRow(ResultSet rs, int rowNum) throws SQLException {
			Account account = new Account();
			account.setId(rs.getInt("id"));
			account.setName(rs.getString("name"));
			account.setMoney(rs.getDouble("money"));
			
			
			
			
			return account;
		}
		
		
	}