TB541-ETH
TB541-ETH
TB541-ETH
TB541-ETH
LabVIEW是當(dāng)前虛擬儀器的主要開發(fā)工具之一，它是NI(National Instruments)公司開發(fā)的一種高效的圖形化編程工具，是一個(gè)標(biāo)準(zhǔn)的數(shù)據(jù)采集和儀器控制軟件，它集開發(fā)、調(diào)試和運(yùn)行于一體，目前通用的最新版本為L(zhǎng)abVIEW7．0。LabVIEW集成了與滿足GPIB、VXI、RS-232和RS-485協(xié)議的硬件及數(shù)據(jù)采集卡通訊的全部功能。它還內(nèi)置了便于應(yīng)用TCP/IP、ActiveX等軟件標(biāo)準(zhǔn)的庫函數(shù)。這是一個(gè)功能強(qiáng)大且靈活的軟件。利用它可以方便地建立自己的虛擬測(cè)量和控制儀器，其圖形化的界面使得編程及使用過程都生動(dòng)有趣。隨著LabVIEW越來越多地用于數(shù)據(jù)采集及分析、儀器和控制、測(cè)試測(cè)量及過程監(jiān)控和控制等領(lǐng)域，對(duì)測(cè)量數(shù)據(jù)進(jìn)行存儲(chǔ)、分析是一個(gè)關(guān)鍵環(huán)節(jié)，這其中要涉及到對(duì)測(cè)量數(shù)據(jù)的讀寫操作，F(xiàn)有的Lab- VIEW版本中還沒有提供與通用數(shù)據(jù)庫直接接口的方法[1]，這一問題可以采用以下幾種辦法解決：
1)采用其他編程語言編寫動(dòng)態(tài)鏈接庫DLL訪問數(shù)據(jù)庫，并在LabVIEW中調(diào)用此DLL與數(shù)據(jù)庫進(jìn)行連接；
2)利用中間文件存取數(shù)據(jù)，先將數(shù)據(jù)存入文件中，在一定的時(shí)刻或者需要時(shí)再將數(shù)據(jù)導(dǎo)入到數(shù)據(jù)庫中。這種方法實(shí)現(xiàn)比較簡(jiǎn)單，但是需要單獨(dú)的軟件對(duì)數(shù)據(jù)文件導(dǎo)入導(dǎo)出；
3)LabVIEW中包含了大量的ActiveX對(duì)象，其中包含了ADO(ActiveX Data Obiects)接口的各種對(duì)象，可以利用ADO的接口進(jìn)行數(shù)據(jù)庫的訪問；
4)使用NI公司的SQL ToolKit for LabVIEW附加工具包與數(shù)據(jù)庫連接；[2]
第一種方法的工作量較大；第二種方法不能對(duì)數(shù)據(jù)進(jìn)行實(shí)時(shí)的存；第三種方法通用性和靈活性欠佳；而第四種方法該工具包需單獨(dú)購買且價(jià)格昂貴。為了解決上述這些問題，我們采用Premise Development公司的Chris Roth和Jeffrey Travis開發(fā)的免費(fèi)的LabVIEW數(shù)據(jù)庫支持VI—LabSQL來完善整個(gè)系統(tǒng)的數(shù)據(jù)庫功能。它將復(fù)雜的底層 ADO及SQL操作封裝成一系列的LabsQL VIs， LabSQL的優(yōu)點(diǎn)是易于理解，不熟悉SQL語言的用戶也可以很容易地使用，只需進(jìn)行簡(jiǎn)單的編程，就可以在LabVIEW中實(shí)現(xiàn)數(shù)據(jù)庫訪問。利用 LabSQL幾乎可以訪問任何類型的數(shù)據(jù)庫，簡(jiǎn)單易用。另外，Microsoft ADO控件具有遠(yuǎn)程數(shù)據(jù)庫訪問的功能，但是LabSQL并沒有開發(fā)這一部分，要在LabVIEW中實(shí)現(xiàn)遠(yuǎn)程數(shù)據(jù)庫的訪問，還需再結(jié)合LabVIEW中包含的ADO接口對(duì)象進(jìn)行再開發(fā)。
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