增加 spring mybatis 样例

spring/spring-mybatis-annotation/src/main/java/com/heibaiying/bean/Flow.java

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+package com.heibaiying.bean;
+
+import lombok.Data;
+
+/**
+ * @author : heibaiying
+ * @description :
+ */
+
+@Data
+public class Flow {
+
+    private long id;
+
+    private long flowId;
+
+    private long plugId;
+}

spring/spring-mybatis-annotation/src/main/java/com/heibaiying/bean/Relation.java

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+package com.heibaiying.bean;
+
+import lombok.Data;
+
+/**
+ * @author : heibaiying
+ * @description :
+ */
+@Data
+public class Relation {
+
+    private String id;
+
+    private String name;
+
+}

spring/spring-mybatis-annotation/src/main/java/com/heibaiying/config/DataSourceConfig.java

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+package com.heibaiying.config;
+
+import lombok.Data;
+import lombok.NoArgsConstructor;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.context.annotation.PropertySource;
+import org.springframework.core.annotation.Order;
+
+/**
+ * @author : heibaiying
+ * @description :
+ */
+
+@Configuration
+@PropertySource(value = "classpath:mysql.properties")
+@Data
+@NoArgsConstructor
+public class DataSourceConfig {
+
+    /**
+     * 感觉这种注入的方式并不够好
+     * 没有spring-boot中使用@ConfigurationProperties(prefix = "config")指定前缀注入的方式优雅
+     */
+    @Value("${mysql.driverClassName}")
+    private String driverClassName;
+    @Value("${mysql.url}")
+    private String url;
+    @Value("${mysql.username}")
+    private String username;
+    @Value("${mysql.password}")
+    private String password;
+
+}

spring/spring-mybatis-annotation/src/main/java/com/heibaiying/config/DispatcherServletInitializer.java

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+package com.heibaiying.config;
+
+import org.springframework.web.servlet.support.AbstractAnnotationConfigDispatcherServletInitializer;
+
+/**
+ * @author : heibaiying
+ */
+
+public class DispatcherServletInitializer extends AbstractAnnotationConfigDispatcherServletInitializer {
+
+    protected Class<?>[] getRootConfigClasses() {
+        return new Class[0];
+    }
+
+    protected Class<?>[] getServletConfigClasses() {
+        return new Class[]{ServletConfig.class};
+    }
+
+    protected String[] getServletMappings() {
+        return new String[]{"/"};
+    }
+}

spring/spring-mybatis-annotation/src/main/java/com/heibaiying/config/ServletConfig.java

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+package com.heibaiying.config;
+
+import org.mybatis.spring.SqlSessionFactoryBean;
+import org.mybatis.spring.mapper.MapperScannerConfigurer;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.ComponentScan;
+import org.springframework.context.annotation.Configuration;;
+import org.springframework.context.annotation.DependsOn;
+import org.springframework.core.annotation.Order;
+import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
+import org.springframework.jdbc.core.JdbcTemplate;
+import org.springframework.jdbc.datasource.DataSourceTransactionManager;
+import org.springframework.jdbc.datasource.DriverManagerDataSource;
+import org.springframework.transaction.annotation.EnableTransactionManagement;
+import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
+
+import java.io.IOException;
+
+
+/**
+ * @author : heibaiying
+ */
+@Configuration
+@EnableTransactionManagement // 开启声明式事务处理 等价于xml中<tx:annotation-driven/>
+@ComponentScan(basePackages = {"com.heibaiying.*"})
+public class ServletConfig implements WebMvcConfigurer {
+
+    @Autowired
+    private DataSourceConfig sourceConfig;
+
+    /**
+     * 配置数据源
+     */
+    @Bean
+    public DriverManagerDataSource dataSource() {
+        DriverManagerDataSource dataSource = new DriverManagerDataSource();
+        dataSource.setDriverClassName("com.mysql.jdbc.Driver");
+        dataSource.setUrl("jdbc:mysql://localhost:3306/mysql");
+        dataSource.setUsername("root");
+        dataSource.setPassword("root");
+        return dataSource;
+    }
+
+
+    /**
+     * 配置mybatis 会话工厂
+     *
+     * @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
+     *                   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
+     */
+    @Bean
+    public SqlSessionFactoryBean sessionFactoryBean(DriverManagerDataSource dataSource) throws IOException {
+        SqlSessionFactoryBean sessionFactoryBean = new SqlSessionFactoryBean();
+        sessionFactoryBean.setDataSource(dataSource);
+        PathMatchingResourcePatternResolver resolver = new PathMatchingResourcePatternResolver();
+        sessionFactoryBean.setMapperLocations(resolver.getResources("classpath*:/mappers/**/*.xml"));
+        sessionFactoryBean.setConfigLocation(resolver.getResource("classpath:mybatisConfig.xml"));
+        return sessionFactoryBean;
+    }
+
+    /**
+     * 配置mybatis 会话工厂
+     */
+    @Bean
+    public MapperScannerConfigurer MapperScannerConfigurer() {
+        MapperScannerConfigurer configurer = new MapperScannerConfigurer();
+        configurer.setSqlSessionFactoryBeanName("sessionFactoryBean");
+        configurer.setBasePackage("com.heibaiying.dao");
+        return configurer;
+    }
+
+    /**
+     * 定义事务管理器
+     */
+    @Bean
+    public DataSourceTransactionManager transactionManager() {
+        DataSourceTransactionManager manager = new DataSourceTransactionManager();
+        manager.setDataSource(dataSource());
+        return manager;
+    }
+
+}

spring/spring-mybatis-annotation/src/main/java/com/heibaiying/dao/MysqlDao.java

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+package com.heibaiying.dao;
+
+import com.heibaiying.bean.Relation;
+import org.apache.ibatis.annotations.Mapper;
+
+import java.util.List;
+
+/**
+ * @author : heibaiying
+ * @description :
+ */
+
+@Mapper
+public interface MysqlDao {
+
+    List<Relation> queryById(String id);
+}

spring/spring-mybatis-annotation/src/main/java/com/heibaiying/dao/OracleDao.java

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+package com.heibaiying.dao;
+
+import com.heibaiying.bean.Flow;
+import org.apache.ibatis.annotations.Mapper;
+
+import java.util.List;
+
+/**
+ * @author : heibaiying
+ * @description :
+ */
+@Mapper
+public interface OracleDao {
+
+    List<Flow> queryById(long id);
+}