参考 http://blog.itpub.net/703656/viewspace-1018470/ 创建表结构 create table test(name char(20), age int, class int); create index idx_name on test(name); create index idx_age_class on test(age, class); insert into test values('张三', 15, 1); insert into test
Oracle数据库克隆后temp文件因路径变化无法找到出现如下报错Errors in filexxxx.trc:ORA-01157: cannot identify/lock data file xxx - see DBWR trace fileORA-01110: data file 201: 'xxx/temp01.dbf' 部分trace文件: DDE: Problem Key 'ORA 1110' was flood controlled (0x5) (no incident)ORA-0
本地路径的创建 在做下载操作时,我们一般先把文件下载到本地指定的路径下,然后再做其他使用. 为了防止程序出现异常,我们通常需要先判断本地是否存在指定的路径. 以C盘Tmp文件夹为例,我们可以这样做,代码如下: if not DirectoryExists('C:\Tmp') then if not CreateDir('C:\Tmp') then raise Exception.Create('Opps, Create New Dir Failed!'); 清空本地指定文件夹下的文件 以C盘Tm
Xcode升级10.3后XiB文件包错,提示: Failed to find or create execution context for description '<IBCocoaTouchPlatformToolDescription: 0x7fefbefd1d80> System content for IBCocoaTouchFramework-EightAndLater <IBScaleFactorDeviceTypeDescription: 0x7fefbebf4f70&g