Description
MyBatis version
3.5.7
Using mybatis-spring-boot-starter:2.2.0 on SDK16 with language level 11
Database vendor and version
AWS RDS MySql 8.0.23
Test case or example project
CreateDB.sql:
create table job
(
jobId int primary key,
jobName varchar(50) not null,
jobDescription varchar(1000) not null,
jobGroup varchar(50) not null,
creationDate datetime not null
);
insert into job (jobId, jobName, jobDescription, jobGroup, creationDate)
values (1, 'Web Dev', 'Do stuff', 'Software', '2021-08-30 23:42:25');
POJO: Job.java
public class Job {
int jobId;
String jobName;
String jobDescription;
String jobGroup;
LocalDateTime creationDate;
public Job(int jobId, String jobName, String jobDescription, String jobGroup, LocalDateTime creationDate) {
this.jobId = jobId;
this.jobName = jobName;
this.jobDescription = jobDescription;
this.jobGroup = jobGroup;
this.creationDate = creationDate;
}
@Override
public boolean equals(Object o) {
if (this == o) {
return true;
}
if (o == null || getClass() != o.getClass()) {
return false;
}
Job job = (Job) o;
return Objects.equals(jobId, job.jobId) && Objects.equals(jobName, job.jobName) && Objects.equals(jobDescription, job.jobDescription) && Objects.equals(jobGroup, job.jobGroup) && Objects.equals(creationDate, job.creationDate);
}
@Override
public int hashCode() {
return Objects.hash(jobId, jobName, jobDescription, jobGroup, creationDate);
}
...Setters and Getters and ToString
}
Mapper: JobMapper.java
package com.example.demo.mapper;
import com.example.demo.pojo.Job;
import org.apache.ibatis.annotations.*;
@Mapper
public interface JobMapper {
@Select("SELECT jobId, jobName, jobDescription, jobGroup, creationDate FROM `web2021-dev`.job WHERE jobId = #{id}")
Job getJobById1(@Param("id") int id);
// Note that I only switched the order of jobId and jobName
@Select("SELECT jobName, jobId, jobDescription, jobGroup, creationDate FROM `web2021-dev`.job WHERE jobId = #{id}")
Job getJobById2(@Param("id") int id);
}
Config: application.yml
spring:
datasource:
url: (RDS access url)
username: ---
password: ---
driver-class-name: com.mysql.cj.jdbc.Driver
UnitTest: JobMapperTest.java
@SpringBootTest
@ExtendWith(SpringExtension.class)
class JobMapperTest {
@Autowired
JobMapper jobMapper;
@Test
void getTest(){
Job jobById1 = jobMapper.getJobById1(1);
System.out.println(jobById1);
Job jobById2 = jobMapper.getJobById2(1);
System.out.println(jobById1);
assertEquals(jobById1, jobById2);
}
}
Steps to reproduce
Running the provided unit test
Expected result
According to the MyBatis documentation, when a ResultMap is not explicit, "In these cases MyBatis is automatically creating a ResultMap behind the scenes to auto-map the columns to the JavaBean properties based on name. "
Thus, getJobById1(1) and getJobById2(1) should return objects with the same fields. And this test would pass.
Actual result
By switching the order of jobName and jobId in the @Select statement of getJobById2, mybatis is trying to assign the value of jobName query to the jobId field which is an int. This results in a number format exception:
nested exception is org.apache.ibatis.executor.result.ResultMapException: Error attempting to get column 'jobName' from result set. Cause: java.lang.NumberFormatException: For input string: "Web Dev"
If we change the type of jobId field to a String, the test passes without any error.