import java.text.DecimalFormat; public void changeColor(View view) { DecimalFormat decimalFormat = new DecimalFormat("000"); //获取随机数对象,产生三个随机数值(RGB值) Random x = new Random(); int red = x.nextInt(256); String sred = decimalFormat.format(red); txv
oracle在使用函数计算式会遇到这样的情况:例如sum函数 如果计算的sum值为null,则用0替代 方法1(便于理解): select when sum(c.num) is null then 0 else sum(t.num) from class c 方法2(简单粗暴): NVL(Expr1,Expr2)如果Expr1为NULL,返回Expr2的值,否则返回Expr1的值 select NVL(SUM(c.num) ,0) from class c
Expression构建DataTable to Entity 映射委托 1 namespace Echofool.Utility.Common { 2 using System; 3 using System.Collections.Generic; 4 using System.Data; 5 using System.Linq.Expressions; 6 using System.Reflection; 7 using System.Reflection.Emit; 8 9 publ
需求:#将数字填充到对应金额单中 select substr(b.payMoney,length(b.payMoney),1) 分, substr(b.payMoney,length(b.payMoney)-1,1) 角, case when length(b.payMoney)-3 <=0 then '' else substr(b.payMoney,length(b.payMoney)-3,1) end 圆, case when length(b.payMoney)-4 <=0 then
用SQL语句,删除掉重复项只保留一条 在几千条记录里,存在着些相同的记录,如何能用SQL语句,删除掉重复的呢1.查找表中多余的重复记录,重复记录是根据单个字段(peopleId)来判断 select * from people where peopleId in (select peopleId from people group by peopleId having count(peopleId) > 1) 2.删除表中多余的重复记录,重复记录是根据单个字段(peopleId)来判断,只留有r
格式化数字保留两位小数点实现的方法有很多,在接下来的文章中将为大家详细介绍下如何使用js来实现 a = a.toFixed(2);//保留2位但结果为一个String类型 a = parseFloat(a);//将结果转换会float //用一步的话如下 a = parseFloat(a.toFixed(2));
用SQL语句,删除掉重复项只保留一条 在几千条记录里,存在着些相同的记录,如何能用SQL语句,删除掉重复的呢1.查找表中多余的重复记录,重复记录是根据单个字段(peopleId)来判断 select * from people where peopleId in (select peopleId from people group by peopleId having count(peopleId) > 1) 2.删除表中多余的重复记录,重复记录是根据单个字段(peopleId)来判断,只留有r