Spring通过c3p0配置bean连接数据库

逃离我推掉我的手 2022-04-13 05:41 128阅读 0赞

Spring配置bean连接数据库两种方法：

（1）直接在.xml文件内部配置：

<?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-4.3.xsd">
    
    	
    	
    	<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
    		<property name="user" value="root"></property>
    		<property name="password" value="wangjian"></property>
    		<property name="driverClass" value="com.mysql.jdbc.Driver"></property>
    		<property name="jdbcUrl" value="jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=utf-8&useSSL=false"></property>
    	</bean>
    
    </beans>

（2）将参数放在外部文件中，然后再读入配置文件：

<?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-4.3.xsd">
    	
    	
    	
    	<context:property-placeholder location="classpath:db.properties" />
    	
    	<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
    		<property name="user" value="${user}"></property>
    		<property name="password" value="${password}"></property>
    		<property name="driverClass" value="${driverclass}"></property>
    		<property name="jdbcUrl" value="${jdbcurl}"></property>
    	</bean>
    	
    
    </beans>

外部的配置文件：

user=root
    password=wangjian
    driverclass=com.mysql.jdbc.Driver
    jdbcurl=jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=utf-8&useSSL=false

测试函数：

package com.primary.spring.beans.properties;
    
    
    
    import java.sql.SQLException;
    
    import javax.sql.DataSource;
    
    import org.springframework.context.ApplicationContext;
    import org.springframework.context.support.ClassPathXmlApplicationContext;
    
    public class Main {
    	public static void main(String[] args) throws SQLException {
    		
    		ApplicationContext ctx = new ClassPathXmlApplicationContext("beans-properties.xml");
    		
    		DataSource dataSource = (DataSource) ctx.getBean("dataSource");
    		System.out.println(dataSource.getConnection());
    	
    	}
    }

测试结果：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dhbmdqaWFuNTMw_size_16_color_FFFFFF_t_70][]

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