F:\Aziliao\mybatis\代码\31.mybatis与spring整合-开发原始dao
1.1. SqlMapConfig.xml
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-config.dtd"> <configuration> <!-- 通过setting配置mybatis的运行参数
注意，设置运行参数会影响 mybatis的运行，一定要注意！
-->
<settings>
<!-- 延迟加载的总开关 -->
<setting name="lazyLoadingEnabled" value="true"/>
<!-- 设置为false实现按需求加载 -->
<setting name="aggressiveLazyLoading" value="false"/>
<!-- 开启二级缓存 -->
<setting name="cacheEnabled" value="true"/>
</settings> <!-- 定义别名 --> <typeAliases>
<!-- 单个别名定义
type:类路径
alias：别名
-->
<!-- <typeAlias type="cn.itcast.mybatis.po.User" alias="user"/> -->
<!-- 批量配置
指定pojo所在包路径，自动扫描包下的pojo定义别名，别名为类名（首字母小写或大写都可以）
-->
<package name="cn.itcast.mybatis.po"/>
<!-- 如果扫描多个包中的pojo，就写多个 package-->
<!-- <package name=""/> -->
</typeAliases> <!-- 加载mapper.xml -->
<mappers>
<!-- 指定classpath下的映射文件 -->
<mapper resource="sqlmap/User.xml" />
<!-- <mapper resource="mapper/UserMapper.xml" /> --> <!-- 通过mapper.java进行加载映射
class指定mapper接口 的路径
要求：mapper.java文件和mapper.xml同名且在同一个目录
-->
<!-- <mapper class="cn.itcast.mybatis.mapper.UserMapper"/> --> <!-- 包扫描方式
指定mapper接口所在包，自动扫描mapper接口进行加载
要求：mapper.java文件和mapper.xml同名且在同一个目录
-->
<package name="cn.itcast.mybatis.mapper"/>
</mappers> </configuration>
db.properties
jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/mybatis
jdbc.username=root
jdbc.password=123
log4j.properties
# Global logging configuration
#\u5728\u5f00\u53d1\u9636\u6bb5\uff0c\u8bbe\u7f6e\u4e3aDEBUG\uff0c\u5230\u751f\u4ea7\u73af\u5883\u4e0a\u8bbe\u7f6einfo\u6216error\u5c31\u884c\u4e86\u3002
log4j.rootLogger=DEBUG, stdout
# Console output...
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%5p [%t] - %m%n
1.2 在spring容器中配置sqlSessionFactory applicationContext.xml
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:mvc="http://www.springframework.org/schema/mvc"
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-3.2.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.2.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop-3.2.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx-3.2.xsd "> <!-- 配置数据源dataSource -->
<!-- 加载配置文件 -->
<context:property-placeholder location="classpath:db.properties"/>
<!-- 数据库连接池 -->
<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
<property name="driverClassName" value="${jdbc.driver}"/>
<property name="url" value="${jdbc.url}"/>
<property name="username" value="${jdbc.username}"/>
<property name="password" value="${jdbc.password}"/>
<property name="maxActive" value="10"/>
<property name="maxIdle" value="5"/>
</bean> <!-- 配置sqlSessionFactory -->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<!-- 配置数据源 -->
<property name="dataSource" ref="dataSource"/>
<!-- 加载mybatis的配置文件 -->
<property name="configLocation" value="classpath:SqlMapConfig.xml"/>
</bean> <!-- 原始dao -->
<bean id="userDao" class="cn.itcast.mybatis.dao.UserDaoImpl">
<property name="sqlSessionFactory" ref="sqlSessionFactory"/>
</bean> </beans>
1.3 Dao接口实现类继承SqlSessionDaoSupport
public interface UserDao {
//根据用户id查询用户信息
public User findUserById(int id)throws Exception;
//根据用户名称模糊查询
public List<User> findUserByName(String name)throws Exception;
//添加用户
public void insertUser(User user) throws Exception;
}public class UserDaoImpl extends SqlSessionDaoSupport implements UserDao {
//由于继承SqlSessionDaoSupport所以这里不用再添加setSqlSessionFacotry方法了。
@Override
public User findUserById(int id) throws Exception {
// Sqlsession定义为局部变量
SqlSession sqlSession = this.getSqlSession();
User user = sqlSession.selectOne("test.findUserById", id);
return user;
}
@Override
public List<User> findUserByName(String name) throws Exception {
// Sqlsession定义为局部变量
SqlSession sqlSession = this.getSqlSession();
List<User> list = sqlSession.selectList("test.findUserByName", "张");
return list;
}
@Override
public void insertUser(User user) throws Exception {
// Sqlsession定义为局部变量
SqlSession sqlSession = this.getSqlSession();
sqlSession.insert("test.insertUser", user);
}
}1.4在spring容器中配置dao
1.15 从spring容器取出dao实例进行测试
public class UserDaoImplTest {
private ApplicationContext applicationContext;
@Before
public void setUp() throws Exception {
//取出spring的容器
applicationContext =
new ClassPathXmlApplicationContext("classpath:applicationContext.xml");
}
@Test
public void testFindUserById() throws Exception {
//从容器中取出dao
UserDao userDao = (UserDao) applicationContext.getBean("userDao");
//调用dao的方法
User user = userDao.findUserById(1);
System.out.println(user);
}
}