配置資料來源

 <!-- 配置結點，可以使用佔位符 -->
<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}"/>
     <!-- 連線池啟動時的初始值 -->
     <property name="initialSize" value="${initialSize}"/>
     <!-- 連線池的最大值 -->
     <property name="maxActive" value="${maxActive}"/>
     <!-- 最大空閒值.當經過一個高峰時間後，連線池可以慢慢將已經用不到的連線慢慢釋放一部分，一直減少到maxIdle為止 -->
     <property name="maxIdle" value="${maxIdle}"/>
     <!--  最小空閒值.當空閒的連線數少於閥值時，連線池就會預申請去一些連線，以免洪峰來時來不及申請 -->
     <property name="minIdle" value="${minIdle}"/>
 </bean>
 

• 當前類路徑下，儲存jdbc.properties檔案。檔案內容如下：

  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

配置事務

• 配置事務時，需要在xml配置檔案中引入用於宣告事務的tx名稱空間

  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

• 事物的配置方式有兩種：註解方式和基於xml配置方式

• 使用註解方式配置事務

  
  ​
  ​

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

採用@Transactional註解方式使用事務

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;

//表明業務方法受spring事務管理
@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 {
    //外部預設next
    public Object mapRow(ResultSet rs, int index) throws SQLException {
        Person person = new Person(rs.getString("name"));
        person.setId(rs.getInt("id"));
        return person;
    }
} 

測試

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("小藍"));
    }
    
    @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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本文由 永倫的小屋 原創。
轉載請註明作者及出處,本文作者為 永倫的小屋。

博文原連結：Spring 系列