出现错误

情景一Invalid bound statement (not found): **.dao.mapper.DataSetMapper.selectList

情景二 Caused by: org.apache.ibatis.exceptions.TooManyResultsException: Expected one result (or null) to be returned by selectOne(), but found: 35

当情景一和情景二同时出现时可能存在以下可能性

可能一 没有读取到mapper文件

检查配置@MapperScan(basePackages = "com.xxx.mapper")

检查mybatis.mapper-locations: classpath:mapper/*.xml的配置路径是否正确

注意项目的target目录下是否有mapper.xml文件如果没有则要在pom.xml加入如下配置

<build>
    <resources>
        <resource>
            <directory>src/main/java</directory>
            <includes>
                <include>**/*.xml</include>
            </includes>
            <filtering>false</filtering>
        </resource>
    </resources>
</build>

可能二 mybatis puls的坑

使用mybatis-plus时不能使用自带的SqlSessionFactory要使用MybatisSqlSessionFactory

@Slf4j
@Configuration
@EnableTransactionManagement
public class DataSourceConfig {
    @Autowired
    private Environment environment;

    @Autowired
    private DataSource mysqlDataSource;

    @Bean
    @ConfigurationProperties(prefix = "mybatis-plus.configuration")
    public MybatisConfiguration globalConfiguration() {
        return new MybatisConfiguration();
    }

    @Bean
    public SqlSessionFactory sqlSessionFactory() throws Exception {
        MybatisSqlSessionFactoryBean sqlSessionFactoryBean = new MybatisSqlSessionFactoryBean ();
        sqlSessionFactoryBean.setDataSource(mysqlDataSource);
        sqlSessionFactoryBean.setConfiguration(globalConfiguration());
        sqlSessionFactoryBean.setTypeAliasesPackage(environment.getProperty("mybatis-plus.type-aliases-package"));
        sqlSessionFactoryBean.setMapperLocations(new PathMatchingResourcePatternResolver().getResources(environment.getProperty("mybatis-plus.mapper-locations")));

        return sqlSessionFactoryBean.getObject();
    }
}

数据库配置项

# Mybatis-plus配置
mybatis-plus:
  # 配置Mapper映射文件
  mapper-locations: classpath*:/mapper/*Mapper.xml
  # 配置Mybatis数据返回类型别名(默认别名是类名)
  type-aliases-package: com.cserver.aischeduler.api.model.entity
  configuration:
    # 自动驼峰命名
    map-underscore-to-camel-case: false
    #log-impl: org.apache.ibatis.logging.stdout.StdOutImpl