cursor

PL/SQL程序设计

由 陌路散爱 提交于 2019-12-20 22:53:51
第一章：PL/SQL概述： 什么是PL/SQL： A。PL/SQL是 Procedure Language & Structured Query Language 的缩写。PL/SQL是对SQL语言存储过程语言的扩展。从ORACLE6以后，ORACLE的RDBMS附带了PL/SQL。它现在已经成为一种过程处理语言，简称PL/SQL。目前的 PL/SQL包括两部分 ，一部分是数据库引擎部分；另一部分是可嵌入到许多产品（如C语言，JAVA语言等）工具中的独立引擎。可以将这两部分称为： 数据库PL/SQL和工具PL/SQL 。两者的编程非常相似。都具有编程结构、语法和逻辑机制。 B。PL /SQL是一种高级数据库程序设计语言，该语言 专门用于在各种环境下对ORACLE数据库进行访问 。由于该语言集成于数据库服务器中 ，所以PL/SQL代码可以对数据进行快速高效的处理。 PL/SQL的好处： A。有利于客户/服务器环境应用的运行 对于客户/服务器环境来说，真正的瓶颈是网络上。无论网络多快，只要客户端与服务器进行大量的数据交换。应用运行的效率自然就回受到影响。如果使用PL/SQL进行编程，将这种具有大量数据处理的应用放在服务器端来执行。自然就 省去了数据在网上的传输时间 。 B。适合于客户环境 PL/SQL由于分为数据库PL/SQL部分和工具PL/SQL。对于客户端来说，PL

SQL SERVER CURSOR

由 三世轮回 提交于 2019-12-20 20:32:23
一：认识游标 游标(Cursor)它使用户可逐行访问由SQL Server返回的结果集。 使用游标(cursor)的一个主要的原因就是把集合操作转换成单个记录处理方式。 用SQL语言从数据库中检索数据后，结果放在内存的一块区域中，且结果往往是一个含有多个记录的集合。 游标机制允许用户在SQL server内逐行地访问这些记录，按照用户自己的意愿来显示和处理这些记录。 二：游标的基本形式 声明游标：形式1DECLARE cursor_name [INSENSITIVE] [SCROLL] CURSORFOR select_statement[FOR {READ ONLY | UPDATE ][OF column_list]}]形式2DECLARE cursor_name CURSOR[LOCAL | GLOBAL][FORWARD_ONLY | SCROLL][STATIC | KEYSET | DYNAMIC][READ_ONLY | SCROLL_LOCKS | OPTIMISTIC]FOR select_statement[FOR {READ ONLY | UPDATE ][OF column_list]}]INSENSITIVE关键字指明要为检索到的结果集建立一个临时拷贝，以后的数据从这个临时拷贝中获取。如果在后来游标处理的过程中，原有基表中数据发生了改变

Control the mouse cursor using C#

由 ぐ巨炮叔叔 提交于 2019-12-20 13:19:41
问题 I'm trying to write a program using C# that would allow me to remotely take control of the mouse on a windows machine. This would allow me to issue commands to the mouse to move to a certain part of the screen and then click on that part of the screen. I was wondering if there were any C# classes that I would be useful in achieving this goal. Any help is appreciated. Thanks! 回答1: I think unless you're just positioning the cursor over your own application, you have to use a windows api call.

Oracle存储过程语法

由 大城市里の小女人 提交于 2019-12-20 11:29:23
存储过程创建语法： create or replace procedure 存储过程名（param1 in type，param2 out type） as 变量1 类型（值范围）; 变量2 类型（值范围）; Begin Select count(*) into 变量1 from 表A where列名=param1； If (判断条件) then Select 列名 into 变量2 from 表A where列名=param1； Dbms_output。Put_line(‘打印信息’); Elsif (判断条件) then Dbms_output。Put_line(‘打印信息’); Else Raise 异常名（NO_DATA_FOUND）; End if; Exception When others then Rollback; End; 注意事项： 1， 存储过程参数不带取值范围，in表示传入，out表示输出 2， 变量带取值范围，后面接分号 3， 在判断语句前最好先用count（*）函数判断是否存在该条操作记录 4， 用select 。。。into。。。给变量赋值 5， 在代码中抛异常用 raise+异常名 以命名的异常 命名的系统异常 产生原因 ACCESS_INTO_NULL 未定义对象 CASE_NOT_FOUND CASE 中若未包含相应的 WHEN ，并且没有设置

Convert a GIF into a CUR file [closed]

由 本秂侑毒 提交于 2019-12-20 11:14:06
问题 As it currently stands, this question is not a good fit for our Q&A format. We expect answers to be supported by facts, references, or expertise, but this question will likely solicit debate, arguments, polling, or extended discussion. If you feel that this question can be improved and possibly reopened, visit the help center for guidance. Closed 7 years ago . How do you create a .cur (for a mouse cursor), from a GIF image file? What tool or process can I use? 回答1: You need to use a cursor

Best way to join tables using sqlite in android

由 你离开我真会死。 提交于 2019-12-20 10:25:00
问题 I am trying to find out the best way to do a simple table join on my two tables using a sqlite database in an android application. Is the simplest way to use CursorJoiner or is there any easier way? 回答1: In the implementation of SQLiteDatabase and SQLiteQueryBuilder you will see that it is possible to pass the tables you want to join to the table argument of query even though the documentation implies it will only take a single name of a table. The documentation for SQLiteQueryBuilder is more

How to make popover appear where my mouse enters the hover target?

由 人走茶凉 提交于 2019-12-20 10:08:48
问题 This is an example code to show the popover window display below my button: $.fn.popover.defaults = $.extend({} , $.fn.tooltip.defaults, { placement: 'bottom', content: '' Now I want the popover window appear on the place where my cursor moves on(not only top/bottom/left/right, but a specific location which depends on where user put their cursor on). How to get it? 回答1: In bootstrap-tooltip.js, replace (at about line 72) , enter: function (e) { with , enter: function (e) { var mousePos = { x:

Starling library - When I try and change cursor to image…it doesn't work (and a sprite element dissapears from stage)

由 こ雲淡風輕ζ 提交于 2019-12-20 06:38:12
问题 I am using Starling to make a really, really, really easy game - I am just trying to add a stationary sprite to the stage...and make it so that when the mouse touches the sprite...the game "stops" and a score is sent. I haven't tried implementing hitTest yet for the collision, but I have run into a sort of conflict problem where, when I comment out the line(s) that is supposed to change the cursor image (see Startup.as - stage.addEventListener(TouchEvent.TOUCH, touchHandler); and

Tab behavior using jQuery

由 蓝咒 提交于 2019-12-20 06:20:02
问题 I have a some text boxes in my form. I don't know their id values. I want change the cursor position from the existing one to the next field by pressing Enter. Pay attention that the cursor may be in different positions at the first time. What is your suggestion? 回答1: you didn't provide your markup so I can't make assumption about your structure (e.g. using .next() if they are sibling elements). So, supposing you have input text, try this example (for jQuery 1.7+) $(document).ready(function()

show data in list view by cursor

由 大憨熊 提交于 2019-12-20 05:40:19
问题 I write a program that can show data that stored in database in listview by cursor.but in runtime it gives me force close.I read logcat but i don t understand what is this error.I give my code and logcat.please help me current_cart code: public class current_cart extends ListActivity { private ListView mainListView = null; CustomSqlCursorAdapter adapter = null; private SqlHelper dbHelper = null; private Cursor currentCursor = null; private ListView listView = null; /** Called when the
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