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。
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
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
<!--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>
添加数据库配置
YAML文件中添加自己数据库的地址
# 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
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
@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;
}
}
SQL Server数据源
@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;
}
}
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
@Mapper
public interface XXXMapper extends BaseMapper<XXX> {
}
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
public interface XXXService extends IService<XXX> {
}
ServiceImpl
@Service
public class XXXServiceImpl extends ServiceImpl<XXXMapper, XXX>
implements XXXService {
}
Spring Boot 集成 MyBatis和 SQL Server实践
springboo-mybatis SQL Server
