SA801F 220VAC
SA801F 220VAC
SA801F 220VAC
SA801F 220VAC
選擇一種客戶/月艮務(wù)器體系結(jié)構(gòu)的數(shù)據(jù)庫軟件，分別安裝在客戶端和服務(wù)器端。
2)連接數(shù)據(jù)庫：
應(yīng)用程序是通過“連接”訪問數(shù)據(jù)源，連接是交換數(shù)據(jù)所必需的環(huán)境。所以，創(chuàng)建“Connection”對象是所有數(shù)據(jù)庫操作的必需的第一步驟。
3)執(zhí)行SQL指令：
通過已經(jīng)建立的連接發(fā)出的SQL指令可以用某種方式來操作數(shù)據(jù)源。Microsoft ADO的Com mand對象，Connection對象以及Recordset對象都提供有執(zhí)行SQL指令的方法，依據(jù)具體情況具體選擇對象。
4)處理結(jié)果：
檢索到的數(shù)據(jù)有需要加以處理的則通過各種需要的算法加以處理。
5)關(guān)閉連接：
執(zhí)行完任務(wù)后，必需切斷與數(shù)據(jù)庫資源的連接，釋放任何屬于連接的資源，關(guān)閉任何從屬對象，因為它使用了服務(wù)器的資源，如果不釋放的話將導(dǎo)致服務(wù)器資源浪費(fèi)并影響服務(wù)器性能[3]。
Oracle是以高級結(jié)構(gòu)化查詢語言(SQL)為基礎(chǔ)的大型關(guān)系數(shù)據(jù)庫，通俗地講它是用方便邏輯管理的語言操縱大量有規(guī)律數(shù)據(jù)的集合，是目前最流行的客戶/服務(wù)器(CLIENT/SERVER)體系結(jié)構(gòu)的數(shù)據(jù)庫之一，也是目前技術(shù)比較領(lǐng)先、應(yīng)用非常廣泛的一個商業(yè)數(shù)據(jù)庫產(chǎn)品。所以我們選擇Oracle來搭建所需的網(wǎng)絡(luò)數(shù)據(jù)庫。數(shù)據(jù)庫管理大部分是對數(shù)據(jù)的查詢、插入、修改和刪除等操作的綜合應(yīng)用。
在運(yùn)行LabVIEW程序的應(yīng)用程序服務(wù)器上，假設(shè)已經(jīng)安裝了Oracle客戶端，并連接數(shù)據(jù)庫服務(wù)器上的遠(yuǎn)程數(shù)據(jù)庫成功，通過Windows控制面板中管理工具里面的“數(shù)據(jù)源(ODBC)”來創(chuàng)建 ODBC數(shù)據(jù)源，設(shè)置系統(tǒng)DSN(數(shù)據(jù)源名稱)為loginoracle，驅(qū)動程序選擇Microsoft ODBC for Oracle。設(shè)置成功后我們就可以像訪問本地數(shù)據(jù)庫一樣訪問遠(yuǎn)程數(shù)據(jù)庫了。
3 應(yīng)用實(shí)例
以下，我們就結(jié)合一個具體的應(yīng)用實(shí)例說明如何在LabVIEW環(huán)境中實(shí)現(xiàn)對遠(yuǎn)程Oracle數(shù)據(jù)庫的訪問。
我們建立了一個校園網(wǎng)虛擬實(shí)驗室，將我？刂葡档倪^程控制實(shí)驗室的液位過程控制實(shí)驗搬到了網(wǎng)站上，學(xué)生和老師在宿舍就可以遠(yuǎn)程監(jiān)視并控制其運(yùn)行狀態(tài)，但是實(shí)驗裝置并不是隨時打開的，我們需要將它的歷史狀態(tài)保存在數(shù)據(jù)庫中，以便在未打開裝置的情況下通過歷史數(shù)據(jù)顯示數(shù)據(jù)采集曲線，因此我們在數(shù)據(jù)庫服務(wù)器上建了一個Wave-form表，將液位高度數(shù)據(jù)和控制器輸出電壓數(shù)據(jù)保存在其中，我們就對這個表進(jìn)行相關(guān)的操作。
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Indramat MDD071C-N-030-N2S-095PB0 Servo Motor
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Rexroth Indramat MHD041B-144-PPO-UN - Servo Motor
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Indramat Rexroth 263991 Permanent Magnet Servo Motor
INDRAMAT MDD071B-N-030-N2L-095PB0 PERMANET MAGNET MOTOR
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