Java开发之Spring连接数据库方法实例分析

本文实例讲述了Java开发之Spring连接数据库方法。分享给大家供大家参考，具体如下：
接口：

package cn.com.service;
import java.util.List;
import cn.com.bean.PersonBean;
public interface PersonService {
 //保存
 public void save(PersonBean person);
 //更新
 public void update(PersonBean person);
 //获取person
 public PersonBean getPerson(int id);
 public List<PersonBean> getPersonBean();
 //删除记录
 public void delete(int personid);
}

Person Bean类：

package cn.com.bean;
public class PersonBean {
 private int id;
 private String name;
 public PersonBean(String name) {
  this.name=name;
 }
 public int getId() {
  return id;
 }
 public void setId(int id) {
  this.id = id;
 }
 public String getName() {
  return name;
 }
 public void setName(String name) {
  this.name = name;
 }
}

接口实现：

package cn.com.service.impl;
import java.util.List;
import javax.sql.DataSource;
import org.springframework.jdbc.core.JdbcTemplate;
import cn.com.bean.PersonBean;
import cn.com.service.PersonService;
public class PersonServiceImpl implements PersonService {
 private JdbcTemplate jdbcTemplate;
 public void setDataSource(DataSource dataSource) {
  this.jdbcTemplate = new JdbcTemplate(dataSource);
 }
 @Override
 public void save(PersonBean person) {
  // TODO Auto-generated method stub
  jdbcTemplate.update("insert into person(name) values(?)", new Object[]{person.getName()},
    new int[]{java.sql.Types.VARCHAR});
 }
 @Override
 public void update(PersonBean person) {
  // TODO Auto-generated method stub
  jdbcTemplate.update("update person set name=? where id=?", new Object[]{person.getName(),person.getId()},
    new int[]{java.sql.Types.VARCHAR,java.sql.Types.INTEGER});
 }
 @Override
 public PersonBean getPerson(int id) {
  // TODO Auto-generated method stub
  return (PersonBean)jdbcTemplate.queryForObject("select * from person where id=?", new Object[]{id},
    new int[]{java.sql.Types.INTEGER},new PersonRowMapper() );
 }
 @SuppressWarnings("unchecked")
 @Override
 public List<PersonBean> getPersonBean() {
  // TODO Auto-generated method stub
  return (List<PersonBean>)jdbcTemplate.query("select * from person",
    new PersonRowMapper() );
 }
 @Override
 public void delete(int personid) {
  // TODO Auto-generated method stub
  jdbcTemplate.update("delete from person where id=?", new Object[]{personid},
    new int[]{java.sql.Types.INTEGER});
 }
}

RowMapper:

package cn.com.service.impl;
import java.sql.ResultSet;
import java.sql.SQLException;
import org.springframework.jdbc.core.RowMapper;
import cn.com.bean.PersonBean;
public class PersonRowMapper implements RowMapper {
 @Override
 public Object mapRow(ResultSet rs, int index) throws SQLException {
  // TODO Auto-generated method stub
  PersonBean person =new PersonBean(rs.getString("name"));
  person.setId(rs.getInt("id"));
  return person;
 }
}

beans.xml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"
  xmlns:aop="http://www.springframework.org/schema/aop"
  xmlns:tx="http://www.springframework.org/schema/tx"
  xsi:schemaLocation="http://www.springframework.org/schema/beans
   http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
   http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-2.5.xsd
   http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.5.xsd
   http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.5.xsd
   ">
    <!-- <context:property-placeholder location="classpath:jdbc.properties"/> -->
    <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
    <property name="driverClassName" value="com.mysql.jdbc.Driver"/>
    <property name="url" value="jdbc:mysql://localhost:3306/wy"/>
    <property name="username" value="root"/>
    <!-- property池启动时的初始值 -->
     <property name="password" value="123"/>
     <!-- 连接name="initialSize" value="${initialSize}"/>-->
     <property name="initialSize" value="1"/>
     <!-- 连接池的最大值 -->
     <property name="maxActive" value="500"/>
     <!-- 最大空闲值.当经过一个高峰时间后，连接池可以慢慢将已经用不到的连接慢慢释放一部分，一直减少到maxIdle为止 -->
     <property name="maxIdle" value="2"/>
     <!-- 最小空闲值.当空闲的连接数少于阀值时，连接池就会预申请去一些连接，以免洪峰来时来不及申请 -->
     <property name="minIdle" value="1"/>
    </bean>
    <bean id="txManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
    <property name="dataSource" ref="dataSource"/>
    </bean>
    <tx:annotation-driven transaction-manager="txManager"/>
    <bean id="personService" class="cn.com.service.impl.PersonServiceImpl">
    <property name="dataSource" ref="dataSource"></property>
    </bean>
</beans>

测试类：

package Junit.test;
import static org.junit.Assert.*;
import org.junit.BeforeClass;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import cn.com.bean.PersonBean;
import cn.com.service.PersonService;
public class PersonTest2 {
 private static PersonService personService;
 @BeforeClass
 public static void setUpBeforeClass() throws Exception {
 ApplicationContext act=new ClassPathXmlApplicationContext("beans.xml");
 personService=(PersonService) act.getBean("personService");
 }
 @Test
 public void save() {
 personService.save(new PersonBean("wyy"));
 }
 @Test
 public void update() {
 PersonBean person=personService.getPerson(1);
 person.setName("wy");
 personService.update(person);
 }
 @Test
 public void getPerson() {
 PersonBean person=personService.getPerson(1);
 System.out.println(person.getName());
 }
 @Test
 public void delete() {
 personService.delete(1);
 }
}

数据库：

Create Table
CREATE TABLE `person` (
 `id` int(11) NOT NULL auto_increment,
 `name` varchar(10) NOT NULL,
 PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=utf8

希望本文所述对大家Java程序设计有所帮助。