1.1 Spring相關jar包引入(共9個jar包)
首先是配置spring容器jar：(context（上下文字段），core（spring核心包），expression（spring表達式）,bean（生產和裝配bean的工廠）,
common-logging（spring 中bean是從aprache引入的，所以要提供logging依賴）)：
a.spring核心容器圖
、 b.spring核心容器jar支持
1.2 Spring JdbcTemplate 里面c3p0支持的 jar包引入
a.jdbc驅動引入
b.Spring jdbcTemplate的相關的jar引入
c.c3p0的相關的jar引入
2.數據庫准備
Source Server : gg
Source Host : localhost:3306 Source Database : spring_database Target Server Type : MYSQL File Encoding : 65001 Date: 2017-03-08 14:27:35 */ SET FOREIGN_KEY_CHECKS=0; -- ---------------------------- -- Table structure for t_user -- ---------------------------- DROP TABLE IF EXISTS `t_user`; CREATE TABLE `t_user` ( `_id` int(11) NOT NULL AUTO_INCREMENT, `username` varchar(50) DEFAULT NULL, `userpwd` varchar(32) DEFAULT NULL, PRIMARY KEY (`_id`) ) ENGINE=InnoDB AUTO_INCREMENT=4 DEFAULT CHARSET=utf8; -- ---------------------------- -- Records of t_user -- ---------------------------- INSERT INTO `t_user` VALUES ('1', 'jake', '123456'); INSERT INTO `t_user` VALUES ('2', 'rose', '123456789'); INSERT INTO `t_user` VALUES ('3', 'tom', '999');
3.編碼測試
2.1 User的標准JavaBean設計
/** * 標准JavaBean * @author GGR * */ public class User { @Override public String toString() { // TODO Auto-generated method stub return super.toString(); } private Integer _id;//用戶id private String username;//用戶名 private String userpwd;//用戶密碼 public User(){} public User(String username,String userpwd){ this.username = username; this.setUserpwd(userpwd); } public String getUsername() { return username; } public void setUsername(String username) { this.username = username; } public String getUserpwd() { return userpwd; } public void setUserpwd(String userpwd) { this.userpwd = userpwd; } public Integer get_id() { return _id; } public void set_id(Integer _id) { this._id = _id; } }
2.2 普通方式使用c3p0連接池
a.1 直接在UserDao里面測試
import java.beans.PropertyVetoException; import org.springframework.jdbc.core.JdbcTemplate; import com.mchange.v2.c3p0.ComboPooledDataSource; public class UserDao { public static void main(String[] args) throws PropertyVetoException { /** * c3p0連接池數據源配置 * 1.創建dataSources連接池對象 * 2.初始化連接池的4項基本配置(4項基本配置是所有種類的連接池都必須配置的) * a.驅動名稱 DriverClass * b.數據庫地址 JdbcUrl * c.用戶名 User * d.密碼 Password */ ComboPooledDataSource dataSource = new ComboPooledDataSource(); dataSource.setDriverClass("com.mysql.jdbc.Driver"); dataSource.setJdbcUrl("jdbc:mysql://localhost:3306/spring_database"); dataSource.setUser("root"); dataSource.setPassword("362427gg"); // 創建模板工具類 JdbcTemplate jdbcTemplate = new JdbcTemplate(); jdbcTemplate.setDataSource(dataSource); jdbcTemplate.update("insert into t_user(username,userpwd)values(?,?)", "tom","999"); } }
a.2. 測試結果
2.3 使用c3p0連接池結合Spring容器
a.1思路：將所有的對象創建和管理權交給spring的容器（IOC/DI）
在src下創建bean.xml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.xsd"> <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"> <property name="driverClass" value="com.mysql.jdbc.Driver"></property> <property name="jdbcUrl" value="jdbc:mysql://localhost:3306/spring_database"></property> <property name="user" value="root"></property> <property name="password" value="362427gg"></property> </bean> <bean id="jdbctemplate" class="org.springframework.jdbc.core.JdbcTemplate"> <property name="dataSource" ref="dataSource"></property> </bean> </beans>
a.2編寫測試代碼
package com.heima_jdbctemplate_c3p0; import org.junit.Test; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; import org.springframework.jdbc.core.JdbcTemplate; public class Testdamo { @Test public void demo(){ String xmlpath = "com/heima_jdbctemplate_c3p0/bean.xml"; ApplicationContext context = new ClassPathXmlApplicationContext(xmlpath); JdbcTemplate jdbcTemplate = (JdbcTemplate) context.getBean("jdbctemplate"); jdbcTemplate.update("insert into t_user(username,userpwd)values(?,?)", "tom","362427"); } }
a.3測試結果
2.4 使用c3p0連接池結合Spring容器（使用JdbcDaoSupport+注解+properties配置文件完成UserDao的設計）
將配置信息直接寫到spring的bean.xml顯然不夠靈活，我們需要將連接池配置信息寫到properties文件里面，這樣方便修改和維護。
a.1 UserDao設計
import java.util.List; import org.springframework.jdbc.core.simple.ParameterizedBeanPropertyRowMapper; import org.springframework.jdbc.core.support.JdbcDaoSupport; /** * 用戶操作dao * @author GGR * ParameterizedBeanPropertyRowMapper提供里數據庫每行每個參數到bean對象每個屬性的映射 */ public class UserDao extends JdbcDaoSupport{ public List<User> getAll(){ return this.getJdbcTemplate().query("select* from t_user",ParameterizedBeanPropertyRowMapper.newInstance(User.class)); } public User QuerybyId(Integer _id){ return this.getJdbcTemplate().queryForObject("select* from t_user where _id=?", ParameterizedBeanPropertyRowMapper.newInstance(User.class),_id); } }
a.2 jdbcinfo.properties相關配置
jdbc.driverClass=com.mysql.Driver
jdbc.jdbcUrl=jdbc:mysql://localhost:3306/spring_database
jdbc.user=root
jdbc.password=362427gg
a.3 bean.xml相關配置
<?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.xsd"> <!-- 配置數據源 --> <context:property-placeholder location="classpath:com/heima_jdbctemplate_c3p0/jdbcInfo.properties"/> <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"> <property name="driverClass" value="${jdbc.driverClass}"></property> <property name="jdbcUrl" value="${jdbc.jdbcUrl}"></property> <property name="user" value="${jdbc.user}"></property> <property name="password" value="${jdbc.password}"></property> </bean> <!-- 掃描含有注解的包 --> <context:component-scan base-package="com.heima_jdbctemplate_c3p0"></context:component-scan> <!-- 配置jdbctemplate實例 --> <bean id="jdbctemplate" class="org.springframework.jdbc.core.JdbcTemplate"> <property name="dataSource" ref="dataSource"></property> </bean> </beans>
a.4測試代碼
package com.heima_jdbctemplate_c3p0; import org.junit.Test; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; import org.springframework.jdbc.core.JdbcTemplate; public class Testdamo { @Test public void demo(){ String xmlpath = "com/heima_jdbctemplate_c3p0/bean.xml"; ApplicationContext context = new ClassPathXmlApplicationContext(xmlpath); UserDao dao = (UserDao) context.getBean("userdao"); System.out.println(dao.getAll()); } }
a.5測試結果
總結：這里只是c3p0連接池的簡單使用，主要是為了和Spring進行整合。