问题：数据库中变量类型为datetime，实体类中变量类型为localdatetime，在进行查询数据库操作时，查询结果不能进行自动映射，报错信息如下：

2022-07-29 14:43:08.705 ERROR [http-nio-83-exec-10] o.a.c.c.C.[.[localhost].[/].[dispatcherServlet] >> Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is org.springframework.dao.InvalidDataAccessApiUsageException: Error attempting to get column 'reportDate' from result set.  Cause: java.sql.SQLFeatureNotSupportedException: getObject with type
; getObject with type; nested exception is java.sql.SQLFeatureNotSupportedException: getObject with type] with root cause
java.sql.SQLFeatureNotSupportedException: getObject with type

解决方案：

1. pom.xml文件中添加依赖

   <dependency>
           <groupId>org.mybatis</groupId>
           <artifactId>mybatis-typehandlers-jsr310</artifactId>
           <version>1.0.1</version>
   </dependency>
   

2. 对应实体类中添加注解

   
   之后再进行数据库查询，可以将数据库中的datetime类型数据映射为实体类中localdatetime类型，但在进行查询结果返回时出错，报错信息如下：

2022-07-29 14:50:33.204 ERROR [http-nio-83-exec-6] com.**.**.**.util.Utils >> toJson
com.fasterxml.jackson.databind.exc.InvalidDefinitionException: Java 8 date/time type `java.time.LocalDateTime` not supported by default: add Module "com.fasterxml.jackson.datatype:jackson-datatype-jsr310" to enable handling (through reference chain: java.util.ArrayList[0]->com.**.**.entity.Statisticv2Apps["reportdate"])

解决方法：

1. pom.xml文件中添加依赖

   <dependency>
           <groupId>com.fasterxml.jackson.datatype</groupId>
           <artifactId>jackson-datatype-jsr310</artifactId>
           <version>2.13.0</version>
   </dependency>
   

2. 进行模块注册

   private static final ObjectMapper objectMapper = new ObjectMapper();
   public static String toJson(Object data){
           try {
               //模块注册
               objectMapper.registerModule(new JavaTimeModule());
               return data == null ? null : objectMapper.writeValueAsString(data);
           } catch (JsonProcessingException e) {
               LOGGER.error("toJson",e);
               return null;
           }
       }