本文主要关注如何使用mybatis/mybatis plus连接SQL Server数据库,因此将省略其他项目配置、代码。
框架选择
应用框架:spring boot
ORM框架:mybatis plus(对于连接数据库而言,mybatis和mybatis plus其实都一样)
数据库连接池:druid
pom依赖
此处仅给出我的配置,mybatis/druid请依据自己项目的需要进行选择。
方便起见我用的是mybatis plus
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| <!--mybatis plus --> <dependency> <groupId>com.baomidou</groupId> <artifactId>mybatis-plus-boot-starter</artifactId> <version>3.1.0</version> </dependency>
<dependency> <groupId>org.mybatis.generator</groupId> <artifactId>mybatis-generator-core</artifactId> <version>1.3.7</version> </dependency> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis-spring</artifactId> <version>2.0.0</version> </dependency>
<!-- druid 连接池 --> <dependency> <groupId>com.alibaba</groupId> <artifactId>druid</artifactId> <version>1.1.12</version> </dependency>
<!--for SqlServer--> <dependency> <groupId>com.microsoft.sqlserver</groupId> <artifactId>sqljdbc4</artifactId> <version>4.0</version> </dependency>
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配置数据源
添加数据库配置
YAML文件中添加自己数据库的地址
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| # SQL Server数据库 spring.datasource.xx.url: jdbc:sqlserver://你的数据库地址:1433;databaseName=你的数据库名称 spring.datasource.xx.username: xxxx spring.datasource.xx.password: xxxx spring.datasource.xx.driver-class-name: com.microsoft.sqlserver.jdbc.SQLServerDriver
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添加数据源
此处和平时我们在spring boot中集成mybatis/mybatis plus一样,添加bean即可。
由于平时经常用到多个数据库,此处展示一个多数据源的例子:一个是mysql,一个是SQL Server
有关mybatis plus配置数据源的注意事项,比如配置mapper文件夹等,请自行问度娘,此处不再一一指出。
注意:下面代码来自实际代码,但批量删除了敏感信息、重新命名,因而可能存在与前面配置信息不一致的地方,仅仅是一个示例
Mysql数据源
mysql数据源配置,注意,由于是多数据源,需要有一个数据源配置中加上@Primary注解
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| @Configuration @MapperScan(basePackages = "com.xxx.mapper", sqlSessionFactoryRef = "mysqlSqlSessionFactory") public class MySQLMybatisPlusConfig {
@Autowired private MybatisPlusProperties properties;
@Autowired private ResourceLoader resourceLoader = new DefaultResourceLoader();
@Autowired(required = false) private Interceptor[] interceptors;
@Autowired(required = false) private DatabaseIdProvider databaseIdProvider;
@Autowired private Environment env;
@Bean(name = "mysqlDataSource") @Primary public DataSource getRecruitDataSource() throws Exception { Properties props = new Properties(); props.put("driverClassName", env.getProperty("spring.datasource.mysqlData.driver-class-name")); props.put("url", env.getProperty("spring.datasource.mysqlData.url")); props.put("username", env.getProperty("spring.datasource.mysqlData.username")); props.put("password", env.getProperty("spring.datasource.mysqlData.password")); return DruidDataSourceFactory.createDataSource(props); }
/** * mybatis-plus分页插件 */ @Bean public PaginationInterceptor paginationInterceptor() { PaginationInterceptor page = new PaginationInterceptor(); page.setDialectType("mysql"); return page; }
@Bean(name = "mysqlSqlSessionFactory") @Primary public MybatisSqlSessionFactoryBean mybatisSqlSessionFactoryBean(@Qualifier("mysqlDataSource") DataSource mysqlDataSource) throws IOException { MybatisSqlSessionFactoryBean mybatisPlus = new MybatisSqlSessionFactoryBean(); try { mybatisPlus.setDataSource(mysqlDataSource); } catch (Exception e) { e.printStackTrace(); } mybatisPlus.setVfs(SpringBootVFS.class); // 设置分页插件 MybatisConfiguration mc = new MybatisConfiguration(); mc.setDefaultScriptingLanguage(MybatisXMLLanguageDriver.class); mc.setMapUnderscoreToCamelCase(true);// 数据库和java都是驼峰,就不需要 mybatisPlus.setConfiguration(mc); if (this.databaseIdProvider != null) { mybatisPlus.setDatabaseIdProvider(this.databaseIdProvider); } mybatisPlus.setTypeAliasesPackage("com.xxx.mysql.bean.model"); mybatisPlus.setTypeHandlersPackage(this.properties.getTypeHandlersPackage()); mybatisPlus.setMapperLocations(this.properties.resolveMapperLocations()); // 设置mapper.xml文件的路径 ResourcePatternResolver resolver = new PathMatchingResourcePatternResolver(); Resource[] resource = resolver.getResources("classpath:mapper/*.xml"); mybatisPlus.setMapperLocations(resource);
return mybatisPlus; } }
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SQL Server数据源
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| @Configuration @MapperScan(basePackages = "com.xxx.survey.mapper", sqlSessionFactoryRef = "xxSqlSessionFactory") public class SqlServerMybatisConfig {
@Autowired private MybatisPlusProperties properties;
@Autowired private ResourceLoader resourceLoader = new DefaultResourceLoader();
@Autowired(required = false) private Interceptor[] interceptors;
@Autowired(required = false) private DatabaseIdProvider databaseIdProvider;
@Autowired private Environment env;
@Bean(name = "xxDataSource") public DataSource getAttendanceDataSource() throws Exception { Properties props = new Properties(); props.put("driverClassName", env.getProperty("spring.datasource.xx.driver-class-name")); props.put("url", env.getProperty("spring.datasource.xx.url")); props.put("username", env.getProperty("spring.datasource.xx.username")); props.put("password", env.getProperty("spring.datasource.xx.password")); return DruidDataSourceFactory.createDataSource(props); }
@Bean(name = "xxSqlSessionFactory") public MybatisSqlSessionFactoryBean mybatisSqlSessionFactoryBean(@Qualifier("xxDataSource") DataSource xxDataSource) throws IOException { MybatisSqlSessionFactoryBean mybatisPlus = new MybatisSqlSessionFactoryBean(); try { mybatisPlus.setDataSource(xxDataSource); } catch (Exception e) { e.printStackTrace(); } mybatisPlus.setVfs(SpringBootVFS.class); // 设置分页插件 MybatisConfiguration mc = new MybatisConfiguration(); mc.setDefaultScriptingLanguage(MybatisXMLLanguageDriver.class); mc.setMapUnderscoreToCamelCase(true);// 数据库和java都是驼峰,就不需要 mybatisPlus.setConfiguration(mc); if (this.databaseIdProvider != null) { mybatisPlus.setDatabaseIdProvider(this.databaseIdProvider); } mybatisPlus.setTypeAliasesPackage("com.xxx.survey.bean.model"); mybatisPlus.setTypeHandlersPackage(this.properties.getTypeHandlersPackage()); mybatisPlus.setMapperLocations(this.properties.resolveMapperLocations()); // 设置mapper.xml文件的路径 ResourcePatternResolver resolver = new PathMatchingResourcePatternResolver(); Resource[] resource = resolver.getResources("classpath:mapper/*.xml"); mybatisPlus.setMapperLocations(resource);
return mybatisPlus; } }
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生成ORM代码
到这里,程序启动应该没什么问题,接着就应该生成DAO层、Service层代码了
mybatis和mybatis plus在此处按照和连接mysql时一样的方法,根据需要写代码即可。
比如对于mybatis plus,需要写3处代码:
- 实体bean,可以利用Spring Boot Code Generator!来根据SQL表结构自动生成
- Mapper代码:都有模板,mybatis plus自己封装的方法已经很够用,有单独需求可以自己写xml来自定义SQL
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| @Mapper public interface XXXMapper extends BaseMapper<XXX> {
}
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- Service代码
好像也有现成的工具可以自动生成mapper service代码来着。
Service接口
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| public interface XXXService extends IService<XXX> { }
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ServiceImpl
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| @Service public class XXXServiceImpl extends ServiceImpl<XXXMapper, XXX> implements XXXService {
}
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参考资料