最近研究了一下Spring + iBATIS。发现看别人的例子是一回事,自己写一个完整的应用又是另外一回事。自己受够了网上贴的一知半解的代码。
iBATIS是一个持久化框架,封面了sql过程,虽然sql语句需要自己写。另外,我觉得对于初学者来说,完整的示例真的很重要,不然不知道文件是如果放置的。
所有的第三包都需要加上,spring、ibatis.-2.3.3.720.jar、sqlijdbc.jar、oscache-2.4.jar、commons-pool-1.3.jar、commons-dbcp-1.4.jar,mysql-connector-5.0.5.jar。不然运行的时候都要报错。
xml文件的位置也很关键,因为访问配置文件需要确定他的路径。
有三个包:
1.bean。
bean包封装了POJO对象Ibatis,如下:
package com.tmall.bean; public class Ibatis { private String id; private String name; public String getId() { return id; } public void setId(String id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } public Ibatis(){ } public Ibatis(String id, String name) { super(); this.id = id; this.name = name; } }
Dao里面有一个Dao和DaoImp。Dao是一个接口,DaoImp实现了Dao的接口。
Dao.java如下:
package com.tmall.dao; import java.util.List; import com.tmall.bean.Ibatis;; public interface Dao { public List<Ibatis> getList(); public Ibatis getByName(String name); public Ibatis getById(String id); public void insert(Ibatis ibatis); public void delete(String id); public void update(Ibatis ibatis); }
package com.tmall.dao; import java.util.List; import org.springframework.orm.ibatis.support.SqlMapClientDaoSupport; import com.tmall.bean.Ibatis; public class DaoImp extends SqlMapClientDaoSupport implements Dao { public void delete(String id) { getSqlMapClientTemplate().delete("deleteUsers", id); } public Ibatis getById(String id) { return (Ibatis)getSqlMapClientTemplate().queryForObject("getUsersById",id); } public Ibatis getByName(String name) { return (Ibatis)getSqlMapClientTemplate().queryForObject("getUsersByName",name); } @SuppressWarnings("unchecked") public List<Ibatis> getList() { return getSqlMapClientTemplate().queryForList("getAllUsers",null); } public void insert(Ibatis ibatis) { getSqlMapClientTemplate().insert("insertUsers",ibatis); } public void update(Ibatis ibatis) { getSqlMapClientTemplate().update("updateUsers", ibatis); } }
applicationContext.xml文件是spring的配置文件,如下:
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd"> <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"> <property name="driverClassName"> <value>com.mysql.jdbc.Driver</value> </property> <property name="username"> <value>root</value> </property> <property name="password"> <value>123456</value> </property> <property name="url"> <value>jdbc:mysql://localhost:3306/test</value> </property> </bean> <bean id="sqlMapClient" class="org.springframework.orm.ibatis.SqlMapClientFactoryBean"> <!-- 此处应注入ibatis配置文件,而非sqlMap文件,否则会出现“there is no statement.....异常” --> <property name="configLocation"> <value>sqlMapConfig.xml</value> </property> </bean> <bean id="DaoImp" class="com.tmall.dao.DaoImp"> <property name="dataSource"> <ref bean="dataSource"/> </property> <property name="sqlMapClient"> <ref bean="sqlMapClient"/> </property> </bean> </beans>
<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE sqlMap PUBLIC "-//ibatis.apache.org//DTD SQL Map 2.0//EN" "http://ibatis.apache.org/dtd/sql-map-2.dtd" > <sqlMap > <typeAlias type="com.tmall.bean.Ibatis" alias="user"/> <resultMap id="ibatisTest" class="user" > <result column="id" property="id" jdbcType="VARCHAR" /> <result column="name" property="name" jdbcType="VARCHAR" /> </resultMap> <!-- 获得全查询列表 --> <select id="getAllUsers" resultMap="ibatisTest"> select * from Ibatis </select> <!-- 根据用户名获得用户对象 --> <select id="getUsersByName" resultMap="ibatisTest"> select * from Ibatis where name=#value# </select> <!-- 根据id获得用户对象 --> <select id="getUsersById" resultMap="ibatisTest"> select * from Ibatis where id=#value# </select> <!-- 新增用户对象 --> <insert id="insertUsers" parameterClass="user"> insert into ibatis (id,name) values (#id#,#name#) </insert> <!-- 删除用户对象 --> <delete id="deleteUsers"> delete from ibatis where id=#value# </delete> <!-- 更新用户对象 --> <delete id="updateUsers" parameterClass="user"> update ibatis set name=#name# where id=#id# </delete> </sqlMap>
<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE sqlMapConfig PUBLIC "-//iBATIS.com//DTD SQL Map Config 2.0//EN" "http://www.ibatis.com/dtd/sql-map-config-2.dtd"> <sqlMapConfig> <sqlMap resource="Ibatis.xml" /> </sqlMapConfig>
package com.tmall.test; import java.util.ArrayList; import java.util.Iterator; import java.util.List; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; import com.tmall.bean.Ibatis; import com.tmall.dao.Dao; public class Test { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub ApplicationContext context=new ClassPathXmlApplicationContext("applicationContext.xml"); Dao dao = (Dao)context.getBean("DaoImp"); dao.insert(new Ibatis("3","new3")); Ibatis ibatis3 = dao.getById("2"); ibatis3.setName("new7"); dao.update(ibatis3); // testDAOImpl.delete("3"); System.out.println("获得全查询列表"); List<Ibatis> result=new ArrayList<Ibatis>(); result = dao.getList(); for (Iterator<Ibatis> iter = result.iterator(); iter.hasNext();) { Ibatis element = (Ibatis) iter.next(); System.out.println(element.getName()); } } }