This article describes the Spring database connection method developed in Java. Share it with everyone for your reference, the details are as follows:
interface:
package cn.com.service; import java.util.List; import cn.com.bean.PersonBean; public interface PersonService { //Save public void save(PersonBean person); //Update public void update(PersonBean person); / /Get person public PersonBean getPerson(int id); public List<PersonBean> getPersonBean(); //Delete record public void delete(int personid); }Person Bean class:
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; } }Interface implementation:
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 configuration
<?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" 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"/> <!-- The initial value when the property pool is started--> <property name=" password" value="123"/> <!-- connection name="initialSize" value="${initialSize}"/>--> <property name="initialSize" value="1"/> <!-- The maximum value of the connection pool--> <property name="maxActive" value="500"/> <!-- The maximum idle value. After a peak time, the connection pool can slowly be used up. The incoming connection is slowly released partially, until it is reduced to maxIdle--> <property name="maxIdle" value="2"/> <!-- Minimum idle value. When the number of idle connections is less than the threshold, the connection pool will pre-apply for some connections to avoid being unable to apply when the peak comes--> <property name="minIdle" value="1"/> </ bean> <bean id="txManager"> <property name="dataSource" ref="dataSource"/> </bean> <tx:annotation-driven transaction-manager="txManager"/> <bean id="personService"> <property name="dataSource" ref="dataSource"></property> </bean> </beans>Test class:
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); } }database:
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
I hope this article will be helpful to everyone in Java programming.