You can create as many user - defined variables as a package requires , but you cannot create additional system variables 可以創(chuàng)建包所需數(shù)量的用戶定義變量,但不能另外創(chuàng)建系統(tǒng)變量。
User - defined variables are defined by package developers , and system variables are defined by integration services 用戶定義變量由包開發(fā)人員定義,系統(tǒng)變量由integration services定義。
Multiple threads may need to access a shared database , for instance , or make updates to a set of system variables 例如,多個線程可能需要訪問一個共享數(shù)據(jù)庫,或?qū)σ唤M系統(tǒng)變量進(jìn)行更新。
System variables that are included in expressions are updated at run time , which changes the results of the property evaluation 表達(dá)式中包含的系統(tǒng)變量在運行時更新,這樣可以更改屬性求值的結(jié)果。
Non - system variables having influence on imaging quality of tdiccd are discussed in the paper . the adjustment method is proposed 摘要對非系統(tǒng)變量在tdiccd成像質(zhì)量的影響進(jìn)行了討論,且給出了校正方法。
The following sample expressions show how to use system variables , operators , functions , and string literals in property expressions 下列示例表達(dá)式說明如何在屬性表達(dá)式中使用系統(tǒng)變量、運算符、函數(shù)和字符串文字。
The variables are typically user - defined variables , although you can also use the system variables that integration services provides 盡管也可以使用integration services提供的系統(tǒng)變量,但變量通常是用戶定義變量。
There are many studies in eyewitness testimony area in american and other countries . several system variables and estimator variables were found 關(guān)于目擊見證的研究國外開展較多,發(fā)現(xiàn)了一些系統(tǒng)變量和估計變量。
The package - level variables include the pre - defined system variables available to a package and the user - defined variables with package scope 包級變量包括可供包使用的預(yù)定義系統(tǒng)變量以及作用域為包的用戶定義變量。
The following table describes the system variables that integration services provides for the for loop , foreach loop , and sequence containers 下表介紹integration services為for循環(huán)、 foreach循環(huán)和序列容器提供的系統(tǒng)變量。