Spring里面dbcp连接池的配置和使用
Spring里面dbcp连接池的配置和使用
DBCP(DataBase connection pool),数据库连接池。是 apache 上的一个 java 连接池项目，也是 tomcat 使用的连接池组件。单独使用dbcp需要2个包：commons-dbcp.jar,commons-pool.jar由于建立数据库连接是一个非常耗时耗资源的行为，所以通过连接池预先同数据库建立一些连接，放在内存中，应用程序需要建立数据库连接时直接到连接池中申请一个就行，用完后再放回去。
相关jar包引入
数据库设计
/*Navicat MySQL Data Transfer
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');编码测试
创建一个web项目，将上面的jar导入lib文件下就是，然后依次创建user,创建UserDao，最后编码测试，src下创建配置文件bean.xml
创建user
package com.heima_jdbctemplate_dbcp.next;/**
* 标准JavaBean
* @author GGR
* */public class User {
@Override public String toString() { // TODO Auto-generated method stub
return super.toString();
} private Integer _id;//用户id
private String username;//用户名
private String userpwd;//用户密码
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;
}
}创建UserDao
package com.heima_jdbctemplate_dbcp;
import java.util.List;
import org.springframework.jdbc.core.simple.ParameterizedBeanPropertyRowMapper;
import org.springframework.jdbc.core.support.JdbcDaoSupport;
import org.springframework.stereotype.Repository;
/**
* 用户操作dao
* @author GGR
* ParameterizedBeanPropertyRowMapper提供里数据库每行每个参数到bean对象每个属性的映射
*/
@Repository("UserDao")
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);
}
}配置文件bean.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"> <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"> <property name="driverClassName" value="com.mysql.jdbc.Driver"></property> <property name="url" value="jdbc:mysql://localhost:3306/spring_database"></property> <property name="username" value="root"></property> <property name="password" value="362427gg"></property> </bean> <bean id="userdao" class="com.heima_jdbctemplate_dbcp.UserDao"> <property name="dataSource" ref="dataSource"></property> </bean> </beans>
编码测试
package com.heima_jdbctemplate_dbcp;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class Testdbcp {
@Test
public void demo() {
String xmlpath = "com/heima_jdbctemplate_dbcp/bean.xml";
ApplicationContext applicationContext = new ClassPathXmlApplicationContext(xmlpath);
UserDao dao = applicationContext.getBean("userdao",UserDao.class);
System.out.println(dao.getAll());
System.out.println(dao.QuerybyId(1));
}
}转载自：https://www.cnblogs.com/ggr0305/p/6522394.html