kotlin使用mybatis plus lambdaQuery报错

_frank2222025-07-30 20:18

记录一下学习kotlin中遇到的问题

报错

bash 复制代码

### Error querying database.  
Cause: org.apache.ibatis.builder.BuilderException: 
Error evaluating expression 
'ew.sqlSegment != null and ew.sqlSegment != '''. 
Cause: org.apache.ibatis.ognl.OgnlException: 
sqlSegment [org.apache.ibatis.reflection.ReflectionException: 
Error parsing property name 'querySingleAnnualIncomeBudget$lambda$2'.  Didn't start with 'is', 'get' or 'set'.]

先把我的实体类贴一下

kotlin 复制代码

data class AnnualIncomeBudget(
	@TableId(type = IdType.ASSIGN_ID)
	var id: Long? = null,

	@ApiModelProperty("年份")
	var year: @NotNull(message = "[年份]不能为空") Int? = null,

	@ApiModelProperty("年初总收入预算金额")
	var totalBudget: @NotNull(message = "[年初总收入预算金额]不能为空") BigDecimal? = null,

	@ApiModelProperty("剩余开票额度")
	var remainingBudget: @NotNull(message = "[剩余开票额度]不能为空") BigDecimal? = null,

	@ApiModelProperty("创建时间")
	var createTime: @NotNull(message = "[创建时间]不能为空") LocalDateTime? = null,

	@ApiModelProperty("更新时间")
	var updateTime: @NotNull(message = "[更新时间]不能为空") LocalDateTime? = null,
)

然后时查询, 很简单

kotlin 复制代码

override fun querySingleAnnualIncomeBudget(year: Int): AnnualIncomeBudget? {
	return getOne(
		Wrappers.lambdaQuery<AnnualIncomeBudget>()
			.eq(AnnualIncomeBudget::year, year)
	)
}

直接贴解决方案

kotlin 复制代码

override fun querySingleAnnualIncomeBudget(year: Int): AnnualIncomeBudget? {
	return getOne(
		Wrappers.query<AnnualIncomeBudget>()
			.eq(AnnualIncomeBudget::year.name, year)
	)
}

放弃lambdaQuery改用query, lambdaquery最终还是会转换成string类型

Kotlin这里AnnualIncomeBudget::year他解析成一个高阶函数了