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Oracle之PL/SQL学习笔记之数据类型(三) 所有的编程语言中变量是使用最频繁的。PL/SQL作为一个面向过程的数据库编程语言同样少不了变量，利用变量可以把PL/SQL块需要的参数传递进来，做到动态执行程序，同时也可以利用变量在PL/SQL内部进行值得传递，甚至可以把值传递出去，最终返回给用户，由此可见，变量是PL/SQL不可或缺的一部分。 1. Oracle预定义的普通数据类型(常见的数据类型) 类型 子类 说明 Oracle中的范围 char Character， String Rowid， Nchar 定长字符串 民族字符集 2000(缺省值1) varchar2 varchar，String ,Nvarchar2 可变字符串 民族语言字符集 4000 Binary_integer 带符号整数，为整数计算优化性能 number(s,p) double,integer,int Long 变长字符串 32767 date 日期型 ROWID 存放数据库行号 URowid 通用行标识符,字符串类型 2. 复合类型 Oracle在PL/SQL中除了提供像前面介绍的各种类型外，还提供一种称为复合类型的类型: 记录和表 2.1 使用%type 我们先看下面的例子: declare c_ename constant varchar2(50):='KING'; v_job

I to need modify the values {place} and {other_place} in the op record. #op{ action = [walk, from, {place}, to, {other_place}], preconds = [[at, {place}, me], [on, floor, me], [other_place, {place}, {other_place}]], add_list = [[at, {other_place}, me]], del_list = [[at, {place}, me]] } But erlang don´t allow modifying variables. Is there a data type for that? erlang doesn't let you modify variables it is true. But nothing prevents you from making modified copies of a variable. Given your record: Rec = #op{ action = [walk, from, {place}, to, {other_place}], preconds = [[at, {place}, me], [on,

Assume you have a record with an overloaded equality operator TSomeRecord = record Value : String; class operator Equal(Left, Right : TSomeRecord) : Boolean; end; (implementation compares string values). If adding two records to the list that are equal based on the overloaded operator I would expect the Contains method to return true in both cases. But in fact, the generic list seems to just compare the memory content of records instead of applying the overloaded equality operator. var List : TList <TSomeRecord>; Record1, Record2 : TSomeRecord; begin Record1.Value := 'ABC'; Record2.Value :=

am experiencing a very strange issue in SSIS (2008). Basic workflow is as follows.. Using a flatfile source (CSV), bring into SSIS, push into SQL. When process is run on dev environment, everything works perfectly. When the dtsx package is placed in production.. using the exact same flat file source, the last record in the file is dropped by the time it gets to the start of the SQL proc. Have gone over everything i can possibly think of including line delimiters, column delimeters, rebuilding the flat file source connection. Has anyone seen anything like this before? The CSV file contains 10

It looks like the Delphi compiler does not honor const record parameters when "records-with-methods" are involved. Having not tried to abuse the const convention previously, I was a little surprised to find the compiler accepted code like that: type TTest = record Field : String; procedure Update; end; procedure TTest.Update; begin Field := Field + '+1'; end; procedure DoStuff(const t : TTest); begin ShowMessage(t.Field); t.Update; ShowMessage(t.Field); end; While if you try to do a t.Field:='doh'; in DoStuff f.i., the compiler will properly complain, but you're allowed to call methods that

I would like to record a firefox browser tab through browser extension like Screencastify extension does in chrome. About Recording Session of chrome extension , chrome.tabCapture API is used to get the stream of the currently active tab and to record the stream RecordRTC.js of Web-RTC Experiment is used. Like wise, Is there any API in Mozilla Firefox to get the stream of the tab in Firefox browser. P.S : I am asking about recording the tab of the firefox not recording the screen or window or through cam. There are several privileged apis that let you capture parts of windows or xul elements