上一节通过mybatis-generator自动生成了CategoryMapper接口，pojo等类，接下来我们写几个简单的测试来进行调用。
一、添加依赖
<dependency> <groupId>com.alibaba</groupId> <artifactId>druid</artifactId> <version>${druid.version}</version> </dependency> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>${junit.version}</version> <scope>test</scope> </dependency>
二、测试SqlSessionFactroy
首先我们看下怎样实例化sqlSessionFactory，然后获取CategoryMapper。
1.新建文件resources/properties/config.property，用来保存数据库连接串和账号。
data_source_url=jdbc:mysql://localhost:3306/store
data_source_username=root
data_source_password=root
2.在resources/spring目录新建spring的配置文件applicationContext.xml
3.配置数据连接。 在applicationContext.xml中添加bean节点dataSource，详细配置参考：http://www.oschina.net/p/druid
<bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource" init-method="init" destroy-method="close"> <property name="url" value="${data_source_url}"/> <property name="username" value="${data_source_username}"/> <property name="password" value="${data_source_password}"/> <!-- 初始化连接大小 --> <property name="initialSize" value="1"/> <!-- 初始化连接池最大使用连接数量 --> <property name="maxActive" value="20"/> <!-- 初始化连接池最小空闲 --> <property name="minIdle" value="1"/> <!-- 获取连接最大等待时间，单位毫秒--> <property name="maxWait" value="60000"/> <!-- 配置间隔多久才进行一次检测，检测需要关闭的空闲连接，单位是毫秒 --> <property name="timeBetweenEvictionRunsMillis" value="60000"/> <!-- 配置一个连接在池中最小生存的时间，单位是毫秒 --> <property name="minEvictableIdleTimeMillis" value="25200000"/> <!-- 打开PSCache，并且指定每个连接上PSCache的大小 --> <!--如果用Oracle，则把poolPreparedStatements配置为true，mysql可以配置为false。分库分表较多的数据库，建议配置为false。--> <property name="poolPreparedStatements" value="false"/> <property name="maxPoolPreparedStatementPerConnectionSize" value="20"/> <property name="validationQuery" value="SELECT 1"/> <property name="testWhileIdle" value="true"/> <property name="testOnBorrow" value="false"/> <property name="testOnReturn" value="false"/> <!-- 打开removeAbandoned功能 --> <property name="removeAbandoned" value="true"/> <!-- 1800秒，也就是30分钟 --> <property name="removeAbandonedTimeout" value="1800"/> <!-- 关闭abanded连接时输出错误日志 --> <property name="logAbandoned" value="true"/> </bean>
4.然后配置bean sqlSessionFactory和sqlSession。
<bean id="sqlSession" class="org.mybatis.spring.SqlSessionTemplate" scope="prototype"> <constructor-arg index="0" ref="sqlSessionFactory"/> </bean> <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"> <property name="dataSource" ref="dataSource"/> <property name="typeAliasesPackage" value="com.data.pojo"/> <property name="mapperLocations" value="classpath*:mapper/CategoryMapper.xml"></property> <property name="configLocation" value="classpath:config/mybatis-config.xml"></property> </bean>
4.测试
有了上面的配置，就可以直接以注解的方式实例化SqlSessionFactory.
@ContextConfiguration(locations = "classpath:spring/applicationContext.xml") @RunWith(SpringJUnit4ClassRunner.class) public class SqlSessionTests { @Autowired private SqlSession sqlSession; @Test public void testSqlSession(){ CategoryMapper categoryMapper= sqlSession.getMapper(CategoryMapper.class); Category category= categoryMapper.selectByPrimaryKey(1); if(category==null){ System.out.println("Do not exist"); } else{ System.out.println(category.getName()); } } }
三、测试直接实例化CategoryMapper
更加简洁的方式是直接通过注解实例化CategoryMapper
1.在applicationContext.xml新增bean节点
<!-- scan for mappers and let them be autowired --> <mybatis:scan base-package="com.data.mapper"/> <!-- mapper 接口所在包名，Spring会自动查找其下的类 --> <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer"> <property name="basePackage" value="com.data.mapper"/> <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"></property> </bean>
2.直接给CategoryMapper添加@Resource注解，来进行实例化。
@ContextConfiguration(locations = "classpath:spring/applicationContext.xml") @RunWith(SpringJUnit4ClassRunner.class)
public class CategoryDaoTests {
@Resource
CategoryMapper categoryMapper;
@Test
public void test_selectById(){
Category category=categoryMapper.selectByPrimaryKey(1);
System.out.println(category.getName());//Fish
}
@Test
public void test_count(){
CategoryExample example=new CategoryExample();
long result=categoryMapper.countByExample(example);
System.out.println(result);
}
@Test
public void test_insert(){
System.out.println("before insert:count "+categoryMapper.countByExample(new CategoryExample()));
Category category=new Category();
category.setName("Test");
categoryMapper.insert(category);
System.out.println("after insert:count "+categoryMapper.countByExample(new CategoryExample()));
}
@Test
public void test_delete(){
System.out.println("before insert:count "+categoryMapper.countByExample(new CategoryExample()));
CategoryExample example=new CategoryExample();
example.createCriteria().andNameEqualTo("Test");
int result=categoryMapper.deleteByExample(example);
System.out.println("删除条数："+result);
System.out.println("after insert:count "+categoryMapper.countByExample(new CategoryExample()));
}
}
