转载:http://blog.163.com/user_zhaopeng/blog/static/166022708201252323942430/ 业务场景: 例如用户表,我们需要建一个字段是创建时间, 一个字段是更新时间. 解决办法可以是指定插入时间,也可以使用数据库的默认时间. 在mysql中如果设置两个默认CURRENT_TIMESTAMP,会出现这样的错误. ERROR 1293 (HY000): Incorrect table definition; there can be o
We have two special characters. The first character can be represented by one bit 0. The second character can be represented by two bits (10 or 11). Now given a string represented by several bits. Return whether the last character must be a one-bit c
如下代码段是关于C#返回字符串的字节长度,一个中文算两个字符的代码. public static int GetLength(string str) { if (str.Length == 0) return 0; ASCIIEncoding ascii = new ASCIIEncoding(); int tempLen = 0; byte[] s = ascii.GetBytes(str); for (int i = 0; i < s.Length; i++) { if ((int)s[i]
Given a string s , find the length of the longest substring t that contains at most 2 distinct characters. Example 1: Input: "eceba" Output: 3 Explanation: t is "ece" which its length is 3. Example 2: Input: "ccaabbb" Output