场景 在使用MyBatis传递多个参数并且传递的参数作为判断条件时提示: invalid comparison: java.util.LinkedHashMap and java.lang.String 注: 博客: https://blog.csdn.net/badao_liumang_qizhi 关注公众号 霸道的程序猿 获取编程相关电子书、教程推送与免费下载。 实现 在Mapper文件中使用动态sql时,对传递的参数进...
在使用MyBatis传递多个参数并且传递的参数作为判断条件时提示: invalid comparison: java.util.LinkedHashMap and java.lang.String 实现 在Mapper文件中使用动态sql时,对传递的参数进行判断时使用了如下的 <where> <if test="#{lx} != null and #{lx}!= ''"> and g.ryfl = #{lx}</if> </where> 1...
Continuing our series of articles concerning proposed practices while working with the Java programming language, we are going to perform a performance comparison between four popularQueueimplementation classes with relevant semantics. To make things more realistic we are going to test against a multi–t...
All nodes are either greater than or equal to or less than or equal to each of its children, according to a comparison predicate defined for the heap. Wikipedia Implements Tree, ReverseIteratorWithIndex, JSONSerializer and JSONDeserializer interfaces. package main import ( "github.com/emirpasic/...
All nodes are either greater than or equal to or less than or equal to each of its children, according to a comparison predicate defined for the heap. Wikipedia Implements Tree, ReverseIteratorWithIndex, JSONSerializer and JSONDeserializer interfaces. package main import ( "github.com/emirpasic/...
我们可以在创建 TreeMap 时传入~ ,不传入的话时没有这个外部比较器Comparator的。 那么问题来啦!为什么 key 不能是null 呢? 请看下图分析~😋 **序号1 **,这里表示当你第一次put 时,会进入compare方法,源码如下: /** * Compares two keys using the correct comparison method for this TreeMap. ...
Mybatis:java.lang.IllegalArgumentException: invalid comparison: java.util.Date and java.lang.String 2019-12-24 10:32 − 原因:对于时间参数进行比较时的一个bug. 如果拿传入的时间类型参数与空字符串''进行对比判断则会引发异常。 错误写法: <if test="updated!= null and updated!= ''"> 正确写发...