一、项目说明
1.1 项目结构
1.2 项目依赖
除了 Spring 相关依赖外,还需要导入数据库驱动和对应的 MyBatis 依赖:
<!--jdbc 相关依赖包-->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>${spring-base-version}</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>8.0.13</version>
</dependency>
<dependency>
<groupId>com.oracle</groupId>
<artifactId>ojdbc6</artifactId>
<version>11.2.0.3.0</version>
</dependency>
<!--mybatis 依赖包-->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis-spring</artifactId>
<version>1.3.2</version>
</dependency>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.4.6</version>
</dependency>
二、整合 MyBatis
2.1 数据库配置
在 resources 文件夹下新建数据库配置文件 jdbc.properties:
# mysql 数据库配置
mysql.driverClassName=com.mysql.jdbc.Driver
mysql.url=jdbc:mysql://localhost:3306/mysql
mysql.username=root
mysql.password=root
# oracle 数据库配置
oracle.driverClassName=oracle.jdbc.driver.OracleDriver
oracle.url=jdbc:oracle:thin:@//IP 地址:端口号/数据库实例名
oracle.username=用户名
oracle.password=密码
2.2 配置数据源
配置数据源、MyBatis 会话工厂和事务管理器:
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context" xmlns:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.1.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd">
<!-- 开启注解包扫描-->
<context:component-scan base-package="com.heibaiying.*"/>
<!--指定配置文件的位置-->
<context:property-placeholder location="classpath:jdbc.properties"/>
<!--配置数据源-->
<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<!--Mysql 配置-->
<property name="driverClassName" value="${mysql.driverClassName}"/>
<property name="url" value="${mysql.url}"/>
<property name="username" value="${mysql.username}"/>
<property name="password" value="${mysql.password}"/>
<!--Oracle 配置-->
<!--<property name="driverClassName" value="${oracle.driverClassName}"/>
<property name="url" value="${oracle.url}"/>
<property name="username" value="${oracle.username}"/>
<property name="password" value="${oracle.password}"/>-->
</bean>
<!--配置 mybatis 会话工厂 -->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="dataSource"/>
<!--指定 mapper 文件所在的位置-->
<property name="mapperLocations" value="classpath*:/mappers/**/*.xml"/>
<property name="configLocation" value="classpath:mybatisConfig.xml"/>
</bean>
<!--扫描注册接口 -->
<!--作用:从接口的基础包开始递归搜索,并将它们注册为 MapperFactoryBean(只有至少一种方法的接口才会被注册;具体类将被忽略)-->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<!--指定会话工厂 -->
<property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
<!-- 指定 mybatis 接口所在的包 -->
<property name="basePackage" value="com.heibaiying.dao"/>
</bean>
<!--定义事务管理器-->
<bean id="transactionManager"
class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource"/>
</bean>
<!-- 开启事务注解@Transactional 支持 -->
<tx:annotation-driven/>
</beans>
2.3 MyBatis 配置
新建mybtais配置文件,按照需求配置额外参数, 更多 settings 配置项可以参考 官方文档
<?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">
<!-- mybatis 配置文件 -->
<configuration>
<settings>
<!-- 开启驼峰命名 -->
<setting name="mapUnderscoreToCamelCase" value="true"/>
<!-- 打印查询 sql -->
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings>
</configuration>
<!--更多settings配置项可以参考官方文档: <a href="http://www.mybatis.org/mybatis-3/zh/configuration.html"/>-->
2.4 数据查询
新建查询接口及其实现类,以下示例分别查询的是 MySQL 和 Oracle 中的字典表:
public interface MysqlDao {
List<Relation> get();
}
<!DOCTYPE mapper
PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.heibaiying.dao.MysqlDao">
<select id="queryById" resultType="com.heibaiying.bean.Relation">
SELECT help_keyword_id AS id,name
FROM HELP_KEYWORD
WHERE HELP_KEYWORD_ID = #{id}
</select>
</mapper>
public interface OracleDao {
List<Flow> queryById(long id);
}
<!DOCTYPE mapper
PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.heibaiying.dao.OracleDao">
<select id="queryById" resultType="com.heibaiying.bean.Flow">
select * from APEX_030200.WWV_FLOW_CALS where ID = #{id}
</select>
</mapper>
2.5 测试查询
新建测试类进行测试:
@RunWith(SpringRunner.class)
@ContextConfiguration({"classpath:springApplication.xml"})
public class MysqlDaoTest {
@Autowired
private MysqlDao mysqlDao;
@Test
public void get() {
List<Relation> relations = mysqlDao.get();
if (relations != null) {
for (Relation relation : relations) {
System.out.println(relation.getId() + " " + relation.getName());
}
}
}
}
@RunWith(SpringRunner.class)
@ContextConfiguration({"classpath:springApplication.xml"})
public class OracleDaoTest {
/*注入接口时: 如果接口有多个实现类 可以用这个注解指定具体的实现类*/
@Qualifier("oracleDaoImpl")
@Autowired
private OracleDao oracleDao;
@Test
public void get() {
List<Flow> flows = oracleDao.get();
if (flows != null) {
for (Flow flow : flows) {
System.out.println(flow.getId() + " " + flow.getPlugId());
}
}
}
}