SQL
数据库链接字符串
-- MySQL server=127.0.0.1;database=dbname;uid=sa;pwd=sa -- Sql Server Data Source=127.0.0.1; Initial Catalog=dbname; User Id=sa; Password=sa; -- 信任的链接 Data Source=127.0.0.1; Initial Catalog=dbname; Integrated Security=SSPI; -- Sqlite Data Source=|DataDirectory|\dbname.db Data Source=dbname.db
Sql Server定位字符串替换
STUFF ( character_expression , start , length ,character_expression )
STUFF ( character_expression , start , length ,character_expression )
判断字段是否为空
-- SQL Server isnull(a,"") -- Oracle nvl(a,"") -- MySql ifnull(a,"")
CSS
垂直居中
1、vertical-align
.center{
vertical-align:middle;
display:block;
}vertical-align生效的前提是元素的dislpay为block。
2、display flex
.parentDiv {
display: flex;
}
.child {
display: flex;
vertical-align: middle;
}正则表达式
// 匹配不以api开头的字符串 ^(?!asd).*$ // 匹配不包含api的字符串 ^((?!api).)*$ // 匹配html结尾的字符串 ^.*html$
