Java开发之Spring连接数据库方法实例分析

前端技术 2023/09/04 Java

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。

本文地址：https://www.stayed.cn/item/11486

转载请注明出处。

本站部分内容来源于网络,如侵犯到您的权益,请 联系我

我的博客

人生若只如初见，何事秋风悲画扇。

我的标签

随笔档案