【正文】 as who should ta ke the whole field of Arda for the foundation of a pillar and so raise it until the cone of its summit were more bitter than a needle。 and they perceived that they themselves in the labour of their music had been busy with the preparation of this dwelling, and yet knew not that it had any purpose beyond its own beauty. For the Children of Il 鷙 atar were conceived by him alone。 And many other things Il 鷙 atar spoke to the Ainur at that time, and because of their memory of his words, and the knowledge that each has of the music that he himself made, the Ainur know much of wha t was, and is, and is to e, and few things are unseen by them. Yet some things there are that they cannot see, neither alone nor ta king counsel together。Behold your Music! This is your minstrelsy。 And he showed to them a vision, giving to them sight where before was only hearing。 and the Ainur followed him. But w hen they were e into the Void, Il 鷙 atar said to them: 39。 Then the Ainur were afraid, and they did not yet prehend the words that were said to them。Mighty are the Ainur, and mightiest among them is Melkor 。 but it was loud, and vain, and endlessly repeated。 and he lifted up his right hand, and behold! a third theme grew amid the confusion, and it was unlike the others. For it seemed at first soft and sweet, a mere rippling of gentle sounds in delicate melodies。 but some began to attune their music to his rather than to the thought w hich they had at first. Then the discord of Melkor spread ever wider, and the melodies which had been heard before foundered in a sea of turbulent sound. But Il 鷙 atar sat and hearkened until it seemed that about his throne there was a raging storm, as of dark waters that made war one upon another in an endless wrath that would not be assuaged. Then Il 鷙 atar arose, and the Ainur perceived that he smiled。 and a sound arose of endless interchanging melodies woven in harmony that passed beyond hearing into the depths and into the heights, and the places of the dwelling of Il 鷙 atar were filled to overflowing, and the music and the echo of the music went out into the Void, and it was not void. Never since have the A inur made a ny music like to this music, though it has been said that a greater still shall be made before Il鷙 atar by the choirs of the Ainur and the Children of Il 鷙 atar after the end of days. Then the themes of Il鷙 atar shall be played aright, and ta ke Being in the moment of their utterance, for all shall then understand fully his intent in their part, and each shall know the prehension of eac h, and Il 鷙 atar shall give to their thoughts the secret fire, being well pleased. But now Il 鷙 atar sat and hearkened, and for a great while it seemed good to him, for in the music there were no flaws. But as the theme progressed, it came into the heart of Melkor to interweave matters of his own imagining that were not in accord with the theme of Il 鷙 atar, for he sought therein to increase the power and glory of the part assigned to himself. To Melkor among the A inur had be en given the greatest gifts of power and knowledge, and he had a share in all the gifts of his brethren. He had gone often alone into the void places seeking the I mperishable Flame。Of the theme that I have declared to you, I will now that ye make in harmony together a Great Music. And since I have kindled you with the Flame Imperishable, ye shall show forth your powers in adorning this theme, each with his own thoughts and devices, if he will. But I win sit and hearken, and be glad that through you great beauty has been wakened into song.39。 for each prehended only that part of me mind of Il 鷙 atar from which he came, and in the understanding of their brethren they grew but slowly. Yet ever as they listened they came to deeper understanding, and increased in unison and harmony. And it came to pass that Il 鷙 atar called together all the Ainur and declared to them a mighty theme, unfolding to them things greater and more wonderful than he had yet revealed。 and he made first the Ainur, the Holy Ones, that were the offspring of his thought, and they were with him before aught else was made. And he spoke to them, propounding to them themes of music。 另外，在系統(tǒng)開發(fā)過程中助手同學也給于我很大的幫助，幫助解決了不少的難點，使得系統(tǒng)能及時開發(fā)完成，還有同組的同學同樣給與我不少幫助，這里一并表示感謝。楊老師認真負責的工作態(tài)度，嚴謹?shù)闹螌W精神和深厚的理論水平都使我收益匪淺。這些都有待進一步改善。 對于數(shù)據(jù)的一致性的問題也通過程序進行了有效的解決。 字段名 字段類型 字段長度 字段說明 訂單編號 文本 8 訂單編號 讀者編號 文本 8 讀者編號 借閱日期 文本 6 借閱日期 押金方式 文本 4 押金方式 其它數(shù)據(jù)庫表略 結(jié)束語 經(jīng)過一個多月的設計和開發(fā)，圖書租借管理系統(tǒng)基本開發(fā)完畢。（因表較多，只列出兩表） 管理員表：用于存放管理員的信息。 6. 2. 3 查詢 會員查詢、讀者查詢、書籍查詢、訂單 /帳單查詢 資金匯總 對單日、金日資金進行匯總 6． 2 系統(tǒng)數(shù)據(jù)庫的實現(xiàn) 數(shù)據(jù)庫設計的好壞，直接關(guān)系到整個程序的好壞，數(shù)據(jù)庫的結(jié)構(gòu)是否合理，能不能滿足現(xiàn)有的要求，今后系統(tǒng)的升級過程中是不是方便，能不能把數(shù)據(jù)庫的結(jié)構(gòu)直接移植到其它的數(shù)據(jù)庫中 使用，比如把 ACCESS 數(shù)據(jù)庫的結(jié)構(gòu)直接導入 SQL Server 中能不能直接使用，是不是還要修改程序等等。 6. 2. 2管理 會員管理、會員管理、普通讀者管理、注冊會員、刪除會員、修改 會員信息、會員類型設置，添加書籍、刪除書籍、修改書信息、借閱書籍、歸還書籍，普通讀者登記、修改讀者信息。 _ 6． 2．系統(tǒng)主界面的實現(xiàn) 6. 2. 1 系統(tǒng)管理 打開系統(tǒng)菜單由數(shù)據(jù)備份、管理員設置、切換、退出組成。如果聲明在下面，那就成了局部變量，那么作用范圍就會不同了，作用就更不同，而且在其它窗體中使用到了這個變量，程序會出錯。其中有兩個變量要定義為公用的變量，因為這段代碼是放在一個模塊中的，為了在每一個窗體中能夠使用這個變量，所以必須要聲明 為公用變量。設置數(shù)據(jù)庫對像 End Sub 上面的一段代碼就是連接數(shù)據(jù)庫的。 DBpath 39。設置數(shù)據(jù)的路徑 Provider=。 \ amp。連接數(shù)據(jù)庫 Set conn = CreateObject() 39。先看看 VB 是如何與 ACCESS2020 數(shù)據(jù)庫相連接的。 在下面的對話框中選 ” 使用設計器創(chuàng)建表 ” ，上面 還有三個按鈕，一個是打開，一個是設計，一個是新建，點擊設計，就可以開始設計數(shù)據(jù)表了。點擊創(chuàng)建就完成。這些就新建了一個數(shù)據(jù)庫文件。 （ 2）創(chuàng)建數(shù)據(jù)庫文件 如果操作系統(tǒng)中安裝了 ACCESS2020的話，可以在開始菜單的程序菜單中可以找到。同時合理的數(shù)據(jù)結(jié)構(gòu)也將有利于程序的實現(xiàn)。 數(shù)據(jù)庫在一個信息管理系統(tǒng)中占有非常重要的位置，數(shù)據(jù)庫結(jié)構(gòu)設計的好壞將直接對應用系統(tǒng)的效果產(chǎn)生影響。數(shù)據(jù)管理是指數(shù)據(jù)的收集、整理、組織 、存儲、維護、檢索、傳送等操作，這部分操作是數(shù)據(jù)處理業(yè)務的基本環(huán)節(jié)，而且是任何數(shù)據(jù)處理業(yè)務中必不可少的共有部分。 使用計算機以后，數(shù)據(jù)處理的速度和規(guī)模，無論是相對于手工方式，還是機械方式，都有無可比擬的優(yōu)勢。存儲器的容量、存儲速率直接影響到數(shù)據(jù)管理技術(shù)的發(fā)展。數(shù)據(jù)庫也被越來越多地應用于生成和維護多媒體應用程序上。經(jīng)典的數(shù)據(jù)庫應用涉及諸如訂單、顧客、工作、員工、學生、電話之類的項，或其它數(shù)據(jù)量較大、需要密切關(guān)注的事務。把設計轉(zhuǎn)變?yōu)閷嶋H的數(shù)據(jù)庫，并且這些數(shù)據(jù)庫帶有功能完備、高效能的應用，是一個工程過程。 數(shù)據(jù)庫的設計和開發(fā)及包括藝術(shù)有包括工程。這些技術(shù)沒有脫離經(jīng)典數(shù)據(jù)庫技術(shù)的要求。數(shù)據(jù)庫技術(shù)能使 Inter 應用超越具有早期應用特點的簡單的發(fā)布。 系統(tǒng)總體規(guī)劃 系統(tǒng)功能 1． 可以進行文本操