【Spring 系列】1. 搭建和配置Spring与jdbc整合的环境

配置数据源

 <!-- 配置结点，可以使用占位符 -->

<context:property-placeholder location=“classpath:jdbc.properties”/>

 <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
    <property name="driverClassName" value="${driverClassName}"/>
    <property name="url" value="${url}"/>
    <property name="username" value="${username}"/>
    <property name="password" value="${password}"/>
     <!-- 连接池启动时的初始值 -->
	 <property name="initialSize" value="${initialSize}"/>
	 <!-- 连接池的最大值 -->
	 <property name="maxActive" value="${maxActive}"/>
	 <!-- 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="${maxIdle}"/>
	 <!--  最小空闲值.当空闲的连接数少于阀值时，连接池就会预申请去一些连接，以免洪峰来时来不及申请 -->
	 <property name="minIdle" value="${minIdle}"/>
 </bean>

当前类路径下，保存jdbc.properties文件。文件内容如下：

driverClassName=org.gjt.mm.mysql.Driver
url=jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=UTF-8
username=root
password=root
initialSize=1
maxActive=500
maxIdle=2
minIdle=1

配置事务

配置事务时，需要在xml配置文件中引入用于声明事务的tx命名空间

xmlns:tx=“http://www.springframework.org/schema/tx”
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.5.xsd
事物的配置方式有两种：注解方式和基于xml配置方式

使用注解方式配置事务

<bean id="personService" class="com.liuyong666.service.impl.PersonServiceBean">
	<property name="dataSource" ref="dataSource"/>
</bean>

采用@Transactional注解方式使用事务

package com.liuyong666.service.impl;

import java.util.List;
import javax.sql.DataSource;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.transaction.annotation.Transactional;
import com.liuyong666.bean.Person;
import com.liuyong666.service.PersonService;

//表明业务方法受spring事务管理
@Transactional
public class PersonServiceBean implements PersonService {
	
	private JdbcTemplate jdbcTemplate;
	
	public void setDataSource(DataSource dataSource){
		this.jdbcTemplate = new JdbcTemplate(dataSource);
	}

	public void save(Person person) {
		jdbcTemplate.update("insert into person(name) values(?)", new Object[]{person.getName()}, 
				new int[]{java.sql.Types.VARCHAR});
	}

	public void update(Person person) {
		jdbcTemplate.update("update  person set name=? where id=?", new Object[]{person.getName(),person.getId()}, 
				new int[]{java.sql.Types.VARCHAR, java.sql.Types.INTEGER});
	}

	public Person getPerson(Integer personid) {
		return (Person) jdbcTemplate.queryForObject("select * from person where id=?", 
				new Object[]{personid}, new int[]{java.sql.Types.INTEGER}, new PersonRowMapper());
	}

	public List<Person> getPersons() {
		return (List<Person>) jdbcTemplate.query("select * from person",new PersonRowMapper());
	}

	public void delete(Integer personid) {
		jdbcTemplate.update("delete from  person where id=?", new Object[]{personid}, 
				new int[]{java.sql.Types.INTEGER});
	}

}

Person

package com.liuyong666.bean;

public class Person {
	private Integer id;
	private String name;
	
	public Person() {
	}
	
	public Person(String name) {
		super();
		this.name = name;
	}
	public Integer getId() {
		return id;
	}
	public void setId(Integer id) {
		this.id = id;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}

PersonRowMapper

package com.liuyong666.service.impl;
import java.sql.ResultSet;
import java.sql.SQLException;
import org.springframework.jdbc.core.RowMapper;
import com.liuyong666.bean.Person;

public class PersonRowMapper implements RowMapper {
	//外部默认next
	public Object mapRow(ResultSet rs, int index) throws SQLException {
		Person person = new Person(rs.getString("name"));
		person.setId(rs.getInt("id"));
		return person;
	}
}

测试

public class PersonServiceTest {
	
	private static PersonService personService;
	
	@BeforeClass
	public static void setUpBeforeClass() throws Exception{
		try {
			ApplicationContext context = new ClassPathXmlApplicationContext(
					"beans.xml");
			personService = (PersonService) context.getBean("personService");
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
	
	@Test
	public void save(){
		personService.save(new Person("小蓝"));
	}
	
	@Test
	public void getPerson(){
		Person p = personService.getPerson(1);
		System.out.println(p.getName());
	}
	
	@Test
	public void update(){
		Person p = personService.getPerson(1);
		p.setName("大明");
		personService.update(p);
	}
	
	@Test
	public void delete(){
		personService.delete(1);
	}
	
	@Test
	public void getBeans(){
		for(Person person : personService.getPersons()){
			System.out.println(person.getName());
		}
	}
}

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