Original url:http://www.2cto.com/database/201203/122387.htmlOracle Cursor Concepts Explained
What is a cursor? ① retrieves the result set from the table, and the mechanism from which each point points to a record for interaction. The
1. The concept of cursors
A cursor is a pointer to a query result set, which is a set of SQL statements that are associated with a SELECT statement by defining a statement. A cursor contains two things:
Cursor result set: The result set that
As the saying goes: the heart of beauty, people have it. Yes, yes, even if I was just a map, I wanted my map to look good. In this article, let's talk about how to customize the mouse style under ArcGIS for JavaScript.First, say a few states. 1.
/Folder in the root directoryEnter "/" and press ENTERThere are many folders, such as etc, home, Lib, MNT, etc.ETC: stores the user name and passwordHome: each user has a folder, which is stored here.Lib: operating system filesMNT: used for
VI/Vim basic usageThis article introduces the basic usage of VI (Vim), but it is enough for common users!
The VI editor is a standard editor for all UNIX and Linux systems. It is not inferior to any of the latest text editors. Here we just briefly
Vim command set and linuxvim command set in Linux
Vim command collection
Command history
Commands starting with ":" and "/" have historical records. You can first type ":" or "/" and then press the up or down arrow to select a historical
Link color when link is not pointvisited the link color that has been orderedHover the color that the cursor puts on the linkStyle when active clicksOrder must be set by link, visited, hover, active1) Normal forma:link{}a:visited{}a:hover{}a:active{}
How to add a picture to a button, show three states, click, Hover, Initial state (no click or hover).
First, prepare 3 images in BMP format with different statuses. For example:Below I use vs2013 demonstration.1Create MFC Project (Basic dialog), I'
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