【導(dǎo)讀】以及前端應(yīng)用程序的開發(fā)兩個(gè)方面。對(duì)于前者要求建立起數(shù)據(jù)一致性和完整性強(qiáng)、數(shù)據(jù)安全。而對(duì)于后者則要求應(yīng)用程序功能完備，易使用等特點(diǎn)。用戶滿意的可行系統(tǒng)。說都至關(guān)重要，所以酒店管理系統(tǒng)應(yīng)該能夠?yàn)橛脩籼峁┏渥愕男畔⒑涂旖莸牟樵兪侄?。人類社?huì)的各個(gè)領(lǐng)域并發(fā)揮著越來越重要的作用。作為計(jì)算機(jī)應(yīng)用的一部分，使用計(jì)算機(jī)。對(duì)入住酒店的客戶信息進(jìn)行管理，具有手工管理所無法比擬的優(yōu)點(diǎn)。方便、可靠性高、存儲(chǔ)量大、保密性好、壽命長(zhǎng)、成本低等。這些優(yōu)點(diǎn)能夠極大地提高酒店。另顧客滿意，增加賓客回頭率，也是酒店的科學(xué)化、正規(guī)化管理，與世界接軌的重要條件。酒店管理系統(tǒng)為例,談?wù)勂溟_發(fā)過程和所涉及到的問題及解決方法。第二章數(shù)據(jù)庫(kù)理論基礎(chǔ)··············································6. 數(shù)據(jù)庫(kù)系統(tǒng)設(shè)計(jì)·················································6

　　

【正文】 e this before. They must know how to do it safely. She w ished she could convince herself of that. it didn39。t help her credibility when the whole ship shuddered. Contact, Bill said. It39。s got us. Cirocco hurried back to her station, just in time to miss seeing the grapple sweep over them. The ship jumped again, and awful noises came from the rear. What did it look like? Great big octopus tentacles without the suckers. He sounded shaken. Tthere were hundreds of them, waving around all over. The ship gave an even greater lurch, and more alarms began to sound. A firestorm of red lights spread across her controls. We39。ve got a hull rupture, Cirocco said, with a calmness she did no t feel. Losing air from the central stem. Sealing off pres sure doors 14 and IS. He hands moved over the controls with out conscious guidance. The lights and buttons were far away, seen through the wrong end of a telescope. T he accelerometer dial began to spin as she was thrown violently forward, then to the side. She came to rest on top of Bill, then struggled back to her scat and strapped in. When the buckle clicked around her waist the ship jerked backwards again, worse than before. Something came through the hatch behind her and hit the viewport, which developed a work of cracks. She hung from her seat, her body straining forward against the belt. A n oxygen cylinder flew through the hatch. T he glass shattered and the sound of the impact was suc ked away with the burst of cold, hard glass knives that turned and dwindled before her eyes. Everything in the cabin that wasn39。t tied down leaped up and hurtled through the mouth of jagged teeth that had once been a viewport. Blood pulsed in her face as she hung above a bottomless blac k hole. Large objects turned lazily in the sunlight. One of them was the engine module of Ringmaster, out there in front of her where it had no right to be. She could see the broken stump of the connecting stem. Her ship was ing apart. Oh, shit, she said, then had a vivid recollection of a tape she had once beard from the flight recorder of an airliner. That had been the last word the pilot had uttered, seconds before impact, when he knew he was going to die. She knew it, too, and the thought filled her with a vast disgust. She watched in dull horror as the thing that had the engines wrapped more tentacles around it. it reminded her of a Portuguese man o39。 way with a fish snared in its poisonous grip. A fuel ta nk rupturedsoundlessly, with a strange beauty. Her world was ing apart with no noise to mark its passing. A cloud of pressed gas quickly dispersed. The thing did not seem to mind. Other tentacles had other parts of the ship. The highgain antenna almost seemed to be swimming away, but it moved too slowly as it tumbled down the well below her. Alive, she whispered. It39。s alive. What did you say? Bill was trying to hold himself secure with both hands m the instrument panel. He was strapped solidly to his chair, but the bolts which held it to the floor had broken. The ship shuddered again, and Cirocco39。s chair came free. The edge of the panel caught her across the thighs and she cried out as she struggled to free herself. Roc ky, things are falling apart in here. She wasn39。t sure whose voice it was, but the fear reached her. She pushed, and mana ged to open her seat belt with one hand while holding her self away from the panel with the other. She slipped out to the side and saw her chair bounce across the shattered array of dials, stick briefly in the frame of the broken port, and launch into space. She thought her legs were broken, but found she could move them. The pain lessened as she drew on reserves of strength to help Bill out of his cha ir. Too late, she saw that his eyes were closed, his forehead and the inside of his helmet smeared with blood. As his body slithered loosely over the control panel she saw the dent his helmet had made in it. She fought for a grip on his thigh, then his calf, his booted foot, and he was falling, falling in the middle of a glittering shower of glass. She came to her senses crouched in the leg well under the control panel. She shook her head, unable to recall what had put her there. But the force of deceleration was not so great now. T hemis had succeeded in bringing Ringmasteror what was left of itup to its own rotational speed. No one was talking. A hurricane of breathing came through the spea ker in her helmet, but no words. T here was nothing to say。 the screams and curses had exhausted themselves. She got to her feet, grabbed the edge of the hatchway above her, and pulled herself through into chaos. No lights wor ked, but sunlight spilled harshly across broken equipment from a large rip in the wall. Cirocco moved through the debris and a suited figure got out of her way. Her head throbbed. One of her eyes was swollen shut. There was a lot of damage. It would take a while to get it cleaned up so they could get under weigh. th nobody39。d ever want. me。 Mum wouldn39。t say. anything, but she39。d be cross after, and they used to e and visit, and so I kept a bottle in my room and I used to put it on. Once I drank some. Nicholas was silent. Aren39。t you going to ask me if I died? She stepped ahead of him, pulling aside the dripping branches. See here, I39。m sorry I said you were stupid. I39。m just thinking, Nicholas said. I39。m not mad at you. Do you really know anything about him? No, but look at it. She gestured. Look around you。 someone built all this. You mean it cost a lot. It39。s automated, of course, but still . . well, the other places where you were before how much space was there for each patient? Take the total volume and divide it by the number of people there. Okay, this is a whole lot bigger, but maybe they think we39。re worth it. Nicholas . . . She paused. Nicholas, Ignacio is homicidal. Didn39。t Dr. Island tell y ou? Yes. And you39。re fourteen and not very big for it, and I39。m a girl. Who are they worried about? The look on Nicholas39。s face startled her. After an hour or more of walking they came to it. It was a band of withered vegetation, brown and blac k and tumbling, and as straight as if it had been drawn w ith a ruler. I was afraid it wasn39。t going to be here, Diane said. It moves around whenever there39。s a storm. It might not have been in our sector any more at all. Nicholas asked. What is it? The Focus. It39。s been all over, but mostly the plants grow back quickly when it39。s gone. It smells funny like the kitchen in a place where they wanted me t