Mybatis3和Spring3整合的三种方法简介:? ? Mybatis和Spring的整合有三种方法,具体如下,个人建议用第三种抽
Mybatis3和Spring3整合的三种方法
简介:
? ? Mybatis和Spring的整合有三种方法,具体如下,个人建议用第三种抽象类方法。其中提供了许多便捷的方法。
?
1、采用数据映射器(MapperFactoryBean)的方式,不用写mybatis映射文件,采用注解方式提供相应的sql语句和输入参数。
??(1)Spring配置文件:
???<!--?引入jdbc配置文件?-->??????
?<context:property-placeholder?location="jdbc.properties"/>??????????
?<!--创建jdbc数据源?-->????????
<bean?id="dataSource"?class="org.apache.commons.dbcp.BasicDataSource"?destroy-method="close">?????????
?<property?name="driverClassName"?value="${driver}"/>????????
??<property?name="url"?value="${url}"/>?????????
?<property?name="username"?value="${username}"/>?????????
?<property?name="password"?value="${password}"/>??????????
<property?name="initialSize"?value="${initialSize}"/>??????????
<property?name="maxActive"?value="${maxActive}"/>???????
???<property?name="maxIdle"?value="${maxIdle}"/>??????????
<property?name="minIdle"?value="${minIdle}"/>???????
?</bean>????????
??<!--?创建SqlSessionFactory,同时指定数据源-->???????
?<bean?id="sqlSessionFactory"?class="org.mybatis.spring.SqlSessionFactoryBean">????????
?<property?name="dataSource"?ref="dataSource"?/>?????????
</bean>?????????
??<!--创建数据映射器,数据映射器必须为接口-->??
??????<bean?id="userMapper"?class="org.mybatis.spring.mapper.MapperFactoryBean">????????
?<property?name="mapperInterface"?value="com.xxt.ibatis.dbcp.dao.UserMapper"?/>???????
??<property?name="sqlSessionFactory"?ref="sqlSessionFactory"?/>????????
?</bean>?????????
?<bean?id="userDaoImpl2"?class="com.xxt.ibatis.dbcp.dao.impl.UserDaoImpl2">???????
?<property?name="userMapper"?ref="userMapper"/>??
?</bean>??
?
数据映射器UserMapper,代码如下:
public?
interface?UserMapper?{?????????@Select("SELECT?*?FROM?user?WHERE?id?=?#{userId}")??????????User?getUser(@Param("userId")?
long?id);????}????dao接口类UserDao,代码如下:Java代码
public?
interface?UserDao?{???????
public?User?getUserById(User?user);???}???dao实现类UserDaoImpl2,,代码如下:Java代码
public?
class?UserDaoImpl2?
implements?UserDao?{????????
private?UserMapper?userMapper;???????????
public?
void?setUserMapper(UserMapper?userMapper)?{?????????????
this.userMapper?=?userMapper;?????????}????????????
public?User?getUserById(User?user)?{???????????
return?userMapper.getUser(user.getId());?????????}????}????2、采用接口org.apache.ibatis.session.SqlSession的实现类org.mybatis.
spring.SqlSessionTemplate。
????mybatis中,?sessionFactory可由SqlSessionFactoryBuilder.来创建。MyBatis-
Spring?中,使用了SqlSessionFactoryBean来替代。SqlSessionFactoryBean有一个必须属性dataSource,另外其还有一个通用属性configLocation(用来指定mybatis的xml配置文件路径)。
???(1)
Spring配置文件:<!--?创建SqlSessionFactory,同时指定数据源-->??<bean?id="sqlSessionFactory"?class="org.mybatis.
spring.SqlSessionFactoryBean"
>??????
<property?name="dataSource"?ref="dataSource"?
/>??????<!--?指定sqlMapConfig总配置文件,订制的environment在
spring容器中不在生效-->????
<property??name="configLocation"??value="classpath:sqlMapConfig.xml"
/>????<!--指定实体类映射文件,可以指定同时指定某一包以及子包下面的所有配置文件,mapperLocations
和configLocation有一个即可,当需
要为实体类指定别名时,可指定configLocation属性,再在mybatis总配置文件中采
用mapper引入实体类映射文件?-->????<!-?-?
<property??name="mapperLocations"??value="classpath*:com/xxt/ibatis/dbcp/**/*.xml"
/>??--
>?<bean
>??(2)mybatis总配置文件sqlMapConfig.xml:
<configuration>?????
<typeAliases>???????
<typeAlias?type="com.xxt.ibatis.dbcp.domain.User"?alias="User"?
/>????
</typeAliases>?????
<mappers>????????
<mapper?resource="com/xxt/ibatis/dbcp/domain/user.map.xml"?
/>???????
</mappers>???
</configuration>?(3)实体类映射文件user.map.xml:<mapper?namespace="com.xxt.ibatis.dbcp.domain.User">????????<resultMap?type="User"?id="userMap">???????????<id?property="id"?column="id"?/>???????????<result?property="name"?column="name"?/>???????????<result?property="password"?column="password"?/>???????????<result?property="createTime"?column="createtime"?/>????????</resultMap>????????<select?id="getUser"?parameterType="User"?resultMap="userMap">??????????select?*?from?user?where?id?=?#{id}????????</select>???<mapper/>??(4)dao层接口实现类UserDaoImpl:Java代码
public?
class?UserDaoImpl?
implements??UserDao??{??????
public?SqlSessionTemplate?sqlSession;??????? ??
public?User?getUserById(User?user)?{??????????
return?(User)sqlSession.selectOne("com.xxt.ibatis.dbcp.domain.User.getUser",?user);??????}??????
public?
void?setSqlSession(SqlSessionTemplate?sqlSession)?{???????????
this.sqlSession?=?sqlSession; ?????}????}??3、采用抽象类org.mybatis.
spring.support.SqlSessionDaoSupport提供SqlSession。
???(1)
spring配置文件:Java代码<bean?id="sqlSessionFactory"?
class="org.mybatis.
spring.SqlSessionFactoryBean">???????<property?name="dataSource"?ref="dataSource"?/>??????<property??name="configLocation"??value="classpath:sqlMapConfig.xml"/>??????<!--?<property??name="mapperLocations"??value="classpath*:com/xxt/ibatis/dbcp/domain/user.map.xml"/???>??-->???</bean>??????<bean?id="sqlSession"?????
class="org.mybatis.
spring.SqlSessionTemplate">??????????<constructor-arg?index="0"?ref="sqlSessionFactory"?/>????</bean>?????<bean?id="userDaoImpl3"?
class="com.xxt.ibatis.dbcp.dao.impl.UserDaoImpl3">??????<!--注入SqlSessionTemplate实例?-->??????<property?name="sqlSessionTemplate"?ref="sqlSession"?/>???????<!--也可直接注入SqlSessionFactory实例,二者都指定时,SqlSessionFactory失效?-->??????<!--?<property?name="sqlSessionFactory"?ref="sqlSessionFactory"?/>? ??-->???</bean>????(2)?dao层接口实现类UserDaoImpl3:
???Java代码
public?
class?UserDaoImpl3?
extends?SqlSessionDaoSupport?
implements?UserDao?{?????
public?User?getUserById(User?user)?{????????
return?(User)?getSqlSession().selectOne("com.xxt.ibatis.dbcp.domain.User.getUser",?user);?????}???} ?