【BUG 记录】ested exception is org.postgresql.util.PSQLException: ERROR: operator does not exist: intege

【BUG 记录】ested exception is org.postgresql.util.PSQLException: ERROR: operator does not exist: intege

1. 问题

在实际开发过程想使用枚举字段,使用了 @EnumValue 方式的枚举,结果报错,其中 gender 是我的枚举字段

数据库中我是用int 存储,Java 用 GenderEnum 接收

我的枚举类为

@Getter
public enum GenderEnum {
    
    

    WOMAN(0, "女人"),

    MAN(1, "男人");

    @EnumValue
    private final Integer code;
    @JsonValue
    private final String desc;

    GenderEnum(Integer code, String desc) {
    
    
        this.code = code;
        this.desc = desc;
    }

}

报错信息:

### Error querying database.  Cause: org.postgresql.util.PSQLException: ERROR: operator does not exist: integer = character varying
  建议:No operator matches the given name and argument types. You might need to add explicit type casts.
  位置:90
### The error may exist in com/haoma/webpgsqldemo/mapper/TestUserMapper.java (best guess)
### The error may involve defaultParameterMap
### The error occurred while setting parameters
### SQL: SELECT  id,name,age,gender,address,phone  FROM test_user     WHERE (name = ? AND gender = ?)
### Cause: org.postgresql.util.PSQLException: ERROR: operator does not exist: integer = character varying
  建议:No operator matches the given name and argument types. You might need to add explicit type casts.
  位置:90
; bad SQL grammar []; nested exception is org.postgresql.util.PSQLException: ERROR: operator does not exist: integer = character varying
  建议:No operator matches the given name and argument types. You might need to add explicit type casts.
  位置:90] with root cause

2. 问题分析

打印日志

2024-04-02 17:40:30.248 DEBUG 28424 --- [nio-8080-exec-1] c.h.w.mapper.TestUserMapper.selectOne    : ==>  Preparing: SELECT id,name,age,gender,address,phone FROM test_user WHERE (name = ? AND gender = ?)
2024-04-02 17:40:30.273 DEBUG 28424 --- [nio-8080-exec-1] c.h.w.mapper.TestUserMapper.selectOne    : ==> Parameters: 小李(String), MAN(String)

可以从日志中看到底层调用的是mybatis selectOne 方法,并且第二个参数的参数类型为String ,基本上就可以锁定问题,枚举转换有问题,正常请开给你,这块应该传递的参数为 1 而不是MAN

3. 解决方案

1. 升级 mybatis-plus 版本

最后通过查阅资料,发现切换 mybatis-plus 版本就能解决
我当时使用的版本为 3.4.1 ,切换成最新版3.5.3之后就没问题了

2. 使用枚举的 get() 方法

如果不想切换版本,那么可以在判断的时候添加.getCode()方法,相当于强制类型转换了

queryWrapper.eq(TestUserEntity::getGender, entity.getGender().getCode());

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转载自blog.csdn.net/qq_45609369/article/details/137279540