PL-SQL用光标查询多条记录,能够以一次一条记录的方式处理多行查询的结果.为每条DML语句创建隐式光标,而显式光标是由用户创建的,以便处理返回多条记录的查询。而且,通过消除反复地分析代码,光标提高了代码的处理速度。 -PL-SQL cursor inquiries with a number of records, to a record in a manner more to find out the results. DML statements for each of the cre

在DOS环境下，开机后，我们面对的不是桌面和图标，而是这样的电脑屏幕：这个C:\>叫做提示符，这个闪动的横线叫做光标。这样就表示电脑已经准备好，在等待我们给它下命令了。-In the DOS environment , the boot , we are not faced the desktop and icons , but this computer screen : This is the C: \> called prompt flashing horizontal lin

A simple painting canvas for drawing with the movement of cursor. Done in Python. Press and drag the mouse to draw anything.