摘要：SELECT * FROM table_name WHERE ( field1,field2,field3... ) IN ( '1' , 1 ,'ONE'... ) ; 组合索引的绝妙搭配!!! 阅读全文

摘要：//静态的计算次数;private static int start = 0; //main方法public static void main(String[] args) { System.out.println(test(9));}//测试方法public static int test(int 阅读全文

摘要：//String类型确保小数精度BigDecimal bigDecimal = new BigDecimal("123.123");//split(String regex)放入的是正则表达,"."会全部剔除,需要"\\."String[] split = bigDecimal.toString() 阅读全文