263 lines
7.1 KiB
Markdown
263 lines
7.1 KiB
Markdown
# spring 整合 mybatis（注解方式）
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## 一、说明
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#### 1.1 项目结构
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<div align="center"> <img src="https://github.com/heibaiying/spring-samples-for-all/blob/master/pictures/spring-mybatis-annotation.png"/> </div>
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#### 1.2 项目依赖
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除了spring相关依赖外，还需要导入数据库驱动和对应的mybatis依赖包
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```xml
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<!--jdbc 相关依赖包-->
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<dependency>
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<groupId>org.springframework</groupId>
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<artifactId>spring-jdbc</artifactId>
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<version>${spring-base-version}</version>
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</dependency>
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<dependency>
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<groupId>mysql</groupId>
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<artifactId>mysql-connector-java</artifactId>
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<version>8.0.13</version>
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</dependency>
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<dependency>
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<groupId>com.oracle</groupId>
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<artifactId>ojdbc6</artifactId>
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<version>11.2.0.3.0</version>
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</dependency>
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<!--mybatis 依赖包-->
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<dependency>
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<groupId>org.mybatis</groupId>
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<artifactId>mybatis-spring</artifactId>
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<version>1.3.2</version>
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</dependency>
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<dependency>
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<groupId>org.mybatis</groupId>
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<artifactId>mybatis</artifactId>
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<version>3.4.6</version>
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</dependency>
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```
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## 二、spring 整合 mybatis
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#### 2.1 在resources文件夹下新建数据库配置文件jdbc.properties及其映射类
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```properties
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# mysql 数据库配置
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mysql.driverClassName=com.mysql.jdbc.Driver
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mysql.url=jdbc:mysql://localhost:3306/mysql
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mysql.username=root
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mysql.password=root
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# oracle 数据库配置
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oracle.driverClassName=oracle.jdbc.driver.OracleDriver
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oracle.url=jdbc:oracle:thin:@//IP地址:端口号/数据库实例名
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oracle.username=用户名
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oracle.password=密码
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```
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```java
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@Configuration
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@PropertySource(value = "classpath:mysql.properties")
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@Data
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public class DataSourceConfig {
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@Value("${mysql.driverClassName}")
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private String driverClassName;
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@Value("${mysql.url}")
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private String url;
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@Value("${mysql.username}")
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private String username;
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@Value("${mysql.password}")
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private String password;
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}
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```
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#### 2.2 配置数据源和mybatis会话工厂、定义事务管理器
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```java
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/**
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* @author : heibaiying
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*/
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@Configuration
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@EnableTransactionManagement // 开启声明式事务处理 等价于xml中<tx:annotation-driven/>
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@ComponentScan(basePackages = {"com.heibaiying.*"})
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public class DatabaseConfig {
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/* @Autowired
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* private DataSourceConfig sourceConfig;
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* 不要采用这种方式注入DataSourceConfig,由于类的加载顺序影响会报空指针异常
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* 最好的方式是在DriverManagerDataSource构造中采用参数注入
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*/
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/**
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* 配置数据源
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*/
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@Bean
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public DriverManagerDataSource dataSource(DataSourceConfig sourceConfig) {
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DriverManagerDataSource dataSource = new DriverManagerDataSource();
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dataSource.setDriverClassName(sourceConfig.getDriverClassName());
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dataSource.setUrl(sourceConfig.getUrl());
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dataSource.setUsername(sourceConfig.getUsername());
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dataSource.setPassword(sourceConfig.getPassword());
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return dataSource;
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}
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/**
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* 配置mybatis 会话工厂
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*
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* @param dataSource 这个参数的名称需要保持和上面方法名一致 才能自动注入,因为
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* 采用@Bean注解生成的bean 默认采用方法名为名称，当然也可以在使用@Bean时指定name属性
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*/
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@Bean
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public SqlSessionFactoryBean sessionFactoryBean(DriverManagerDataSource dataSource) throws IOException {
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SqlSessionFactoryBean sessionFactoryBean = new SqlSessionFactoryBean();
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sessionFactoryBean.setDataSource(dataSource);
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PathMatchingResourcePatternResolver resolver = new PathMatchingResourcePatternResolver();
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sessionFactoryBean.setMapperLocations(resolver.getResources("classpath*:/mappers/**/*.xml"));
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sessionFactoryBean.setConfigLocation(resolver.getResource("classpath:mybatisConfig.xml"));
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return sessionFactoryBean;
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}
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/**
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* 配置mybatis 会话工厂
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*/
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@Bean
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public MapperScannerConfigurer MapperScannerConfigurer() {
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MapperScannerConfigurer configurer = new MapperScannerConfigurer();
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configurer.setSqlSessionFactoryBeanName("sessionFactoryBean");
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configurer.setBasePackage("com.heibaiying.dao");
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return configurer;
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}
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/**
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* 定义事务管理器
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*/
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@Bean
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public DataSourceTransactionManager transactionManager(DriverManagerDataSource dataSource) {
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DataSourceTransactionManager manager = new DataSourceTransactionManager();
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manager.setDataSource(dataSource);
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return manager;
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}
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}
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```
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#### 2.3 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](http://www.mybatis.org/mybatis-3/zh/configuration.html)
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```xml
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<?xml version="1.0" encoding="UTF-8" ?>
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<!DOCTYPE configuration
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PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
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"http://mybatis.org/dtd/mybatis-3-config.dtd">
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<!-- mybatis 配置文件 -->
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<configuration>
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<settings>
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<!-- 开启驼峰命名 -->
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<setting name="mapUnderscoreToCamelCase" value="true"/>
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<!-- 打印查询sql -->
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<setting name="logImpl" value="STDOUT_LOGGING"/>
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</settings>
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</configuration>
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<!--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"/>-->
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```
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#### 2.4 新建查询接口及其对应的mapper文件
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```java
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public interface MysqlDao {
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List<Relation> get();
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}
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```
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```xml
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<!DOCTYPE mapper
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PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
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"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
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<mapper namespace="com.heibaiying.dao.MysqlDao">
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<select id="queryById" resultType="com.heibaiying.bean.Relation">
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SELECT help_keyword_id AS id,name
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FROM HELP_KEYWORD
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WHERE HELP_KEYWORD_ID = #{id}
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</select>
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</mapper>
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```
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```mysql
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public interface OracleDao {
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List<Flow> queryById(long id);
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}
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```
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```xml
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<!DOCTYPE mapper
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PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
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"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
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<mapper namespace="com.heibaiying.dao.OracleDao">
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<select id="queryById" resultType="com.heibaiying.bean.Flow">
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select * from APEX_030200.WWV_FLOW_CALS where ID = #{id}
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</select>
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</mapper>
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```
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#### 2.5 新建测试类进行测试
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```java
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@RunWith(SpringRunner.class)
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@ContextConfiguration(classes = {DatabaseConfig.class})
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public class MysqlDaoTest {
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@Autowired
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private MysqlDao mysqlDao;
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@Test
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public void get() {
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List<Relation> relations = mysqlDao.queryById("691");
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if (relations != null) {
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for (Relation relation : relations) {
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System.out.println(relation.getId() + " " + relation.getName());
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}
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}
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}
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}
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```
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```java
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@RunWith(SpringRunner.class)
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@ContextConfiguration(classes = {DatabaseConfig.class})
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public class OracleDaoTest {
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@Autowired
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private OracleDao oracleDao;
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@Test
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public void get() {
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List<Flow> flows = oracleDao.queryById(217584603977429772L);
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if (flows != null) {
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for (Flow flow : flows) {
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System.out.println(flow.getId() + " " + flow.getPlugId());
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}
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}
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}
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}
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```
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