mybatis判断集合为空或者元素个数为零: <if test="mlhs != null and mlhs.size() != 0"> and t.mlh_name not in <foreach collection="mlhs" item="item1" open="(" close=")" index="i" separator=",">
0配置文件的形式主要是采用spring3.0提供的@configuration注解和spring容器在启动的时候会加载实现了WebApplicationInitializer的类,并调用其onStartUp的方法的特性去实现. 具体做法如下: 1.建立MyWebAppInitializer去实现WebApplicationInitializer接口,并且去重写其onStartUp方法.实际上这个类取代了web.xml的配置.代码如下: public class MyWebAppInitializ
mybatis将传入的Integer类型的0被识别成空字符串,网上的解决办法: <if test="status != null and status != '' or status == 0"> and status = #{status, jdbcType = INTEGER}</if> 然而还是有无效的时候.既然status==''时无效,就将其置为null.此时就在Java中对该参数进行处理,当 status == '' 时将其赋值为 null. @Po
package huawei; import java.util.Scanner; public class 约瑟夫环 { private static class Node { public int num; public Node next; public Node(int n) { num=n; } } public static String getOutString(int len, String str, int m) { String ans=""; String s[]
比如a[]={2,4,5,6,7},得出的两组数{2,4,6}和{5,7},abs(sum(a1)-sum(a2))=0: 比如{2,5,6,10},abs(sum(2,10)-sum(5,6))=1,所以得出的两组数分别为{2,10}和{5,6}. vector<int> vct; int last = INT_MAX; int halfOfSum(int* arr, int len) { int sum = 0; for (int i = 0; i < len; ++i) { sum
Java语法: private String[] tagIds; MyBatis语法 <delete id="deleteByIds" parameterType="java.util.List" > delete from BIZ_USER_TAG_REL where ID in <foreach item="item" index="index" collection="list" o
Value of '0' is not valid for 'emSize','emSize' should be greater than 0 and less than or equal to System.Single.MaxValue.Parameter name:emSize. 检查字体大小是不是小于等于0了. new System.Drawing.Font(name,size,fontStyle).