Spring系列介绍3

 

 

public class Person {
   private Integer id;
   private String name;
  
   public Person(){}
  
   public Person(String name) {
     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;
  }
}

 

public class PersonRowMapper implements RowMapper {

   public Object mapRow(ResultSet rs, int index) throws SQLException {
    Person person = new Person(rs.getString( "name"));
    person.setId(rs.getInt( "id"));
     return person;
  }
}

public interface PersonService {
   /**
    * 保存person
    * @param person
    */
   public void save(Person person);
   /**
    * 更新person
    * @param person
    */
   public void update(Person person);
   /**
    * 获取person
    * @param personid
    * @return
    */
   public Person getPerson(Integer personid);
   /**
    * 获取所有person
    * @return
    */
   public List<Person> getPersons();
   /**
    * 删除指定id的person
    * @param personid
    */
   public void delete(Integer personid);
}

 

@Transactional
public class PersonServiceBean implements PersonService {
   private JdbcTemplate jdbcTemplate;
  
   public void setDataSource(DataSource dataSource) {
     this.jdbcTemplate = new JdbcTemplate(dataSource);
  }

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

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

   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});
  }
}

 

jdbc.properties

driverClassName=org.gjt.mm.mysql.Driver
url=jdbc\:mysql\://localhost\:3306/itcast?useUnicode\=true&characterEncoding\=UTF-8
username=root
password=123456
initialSize=1
maxActive=500
maxIdle=2
minIdle=1

<? 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 ="${driverClassName}" />
         < property name ="url" value ="${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 >

   < 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.itcast.service.impl.PersonServiceBean" >
     < property name ="dataSource" ref ="dataSource" />
   </ bean >
</ beans >