hurry help

helendog 2003-08-18 04:20:09
大家帮帮忙。有一个表a,现要用select取出一些记录,在网页中显示。然后再其中一些记录中加入一些信息,在保存在表b中。我们只需保存加入信息的那些记录,实现这个过程该怎么做,怎样一条记录来判断。
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helenpig 2003-09-10
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可以,用多个连接
jsidiot 2003-08-18
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jsp的方法我不是很懂,不过页面的方法到是很好解决
设置一个页面元素,每条记录设置一个元素,元素名 "sign_" + recordset
设置初始值为0,如果该行中的一个元素发生变化,则改变 "sign_" + recordset元素的值为1,那么在保存的时候判断该值就可以了.为1则保存,否则不保存
Most programming languages contain good and bad parts, but JavaScript has more than its share of the bad, having been developed and released in a hurry before it could be refined. This authoritative book offers a detailed explanation of the features that make JavaScript an outstanding object-oriented programming language, and warns you about the bad parts., In the process, JavaScript: The Good Parts defines a subset of JavaScript that's more reliable, readable, and maintainable than the language as a whole. Author Douglas Crockford, a member of JavaScript 2.0 committee at ECMA, is considered by many people in the development community to be the JavaScript expert., A beautiful, elegant, lightweight and highly expressive language lies buried under a steaming pile of good intentions and blunders, he explains. The very good ideas include functions, loose typing, dynamic objects, and an expressive object literal notation. Awful ideas include a programming model based on global variables. With JavaScript: The Good Parts, you can release this elegant programming language from its old shell, and create more maintainable, extensible, and efficient code., The book's topics include:, * Syntax, * Objects, * Functions, * Inheritance, * Arrays, * Regular expressions, * Methods, * Style, * Beautiful features, Appendices summarize JavaScript's bad parts and awful parts. But the greatest benefit of studying the good parts is that you can avoid the need to unlearn the bad parts. If you want to learn more about the bad parts and how to use them badly, consult any other JavaScript book., JavaScript is the language of the Web -- the only language found in all browsers -- so avoiding it altogether is not an alternative. But, whether you're managing object libraries or just trying to get Ajax to run fast, Crockford's guidance in JavaScript: The Good Parts will help you create truly effective JavaScript code.
It may be difficult to imagine that a technology born as recently as 1995 would have had enough of a life cycle to experience a rise and fall in popularity, followed now by an amazing renaissance. Client-side scripting, begun initially with JavaScript embedded in Netscape Navigator 2, has experienced such a roller coaster ride. A number of early incompatibilities among major browsers caused many a content author’s head to ache. But we learned to live with it, as a long period of stability in one platform— Internet Explorer 6, in particular—meant that we could use our well-worn compatibility workarounds without cause for concern. Another stabilizing factor was the W3C DOM Level 2 specification, which remained a major target for browser makers not following Microsoft’s proprietary ways. Mozilla, Safari, and Opera used the W3C DOM as the model to implement, even if Microsoft didn’t seem to be in a hurry to follow suit in all cases. Two factors have contributed to the rebirth of interest in JavaScript and Dynamic HTML. The first is the wide proliferation of broadband connections. Implementing large client-side applications in JavaScript can take a bunch of code, all of which must be downloaded to the browser. At dial-up speeds, piling a 50–75 kilobyte script onto a page could seriously degrade perceived performance; at broadband speeds, nobody notices the difference. But without a doubt, the major attraction these days is the now widespread availability in all mainstream browsers of a technology first implemented by Microsoft: the XMLHttpRequest object. It’s a mouthful (leading some to refer to it as, simply, XHR), but it allows background communication between the browser and server so that a script can request incremental data from the server and update only a portion of a page. It is far more efficient than downloading a bunch of data with the page and less visually disruptive than the old submit-and-wait-for-a-new-page process. To help put a label on the type of applications one can build with this technology, the term Asynchronous JavaScript and XML (Ajax) was coined. In truth, Ajax is simply a catchy
Title: An Introduction to 3D Printing Author: Jonas A Zukas, Victoria Zukas Length: 132 pages Edition: 1 Language: English Publisher: First Edition Design Publishing Publication Date: 2015-05-06 ISBN-10: 1622878965 ISBN-13: 9781622878963 This book is aimed at an audience consisting of two kinds of readers. The first is people who are curious about 3D printing and want more information without necessarily getting deeply into it. For this audience, the first two chapters will be of greatest interest. They provide an overview of 3D print technology. They also serve to take the confusion out of the jargon and make sense out of such shortcuts as SLA, FFM, FFF, FDM, DLP, LOM, SLM, DMLS, SLS, EBM, EBAM, CAD and others. They describe the basic processes, the materials used and the application of the technology in industry, space, medicine, housing, clothing and consumer-oriented products such as jewelry, video game figures, footwear, tools and what must now seem like an infinity of bunnies, eagles and busts of Star Wars and Star Trek figurines in a dazzling array of colors. This book also addresses the needs of people new to the field who require information in a hurry. Chapter 3 serves as a guide to generating a 3D model by reviewing scanning methodology, the various types of software available to create a model and the steps needed to insure a useful printed object from the 3D model. The chapter has numerous references which, together with the information in the text, will help one find quickly any additional information available on the internet. Victoria E. Zukas received her bachelor's degree in Interactive Media and Game Development in 2009 from Worcester Polytechnic Institute. She completed her Masters of Professional Studies in Digital Media in 2013 at Northeastern University. She has spent her time since then working as a Freelance Graphic Designer on a number of projects. Her background is mainly focused on creating 3D models for video games. Her published game
注:下载后,评价给5星,还你11分 Part I. Basic and Advanced vi 1. The vi Text Editor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 A Brief Historical Perspective 5 Opening and Closing Files 6 Quitting Without Saving Edits 10 2. Simple Editing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 vi Commands 13 Moving the Cursor 14 Simple Edits 18 More Ways to Insert Text 30 Joining Two Lines with J 31 Review of Basic vi Commands 32 3. Moving Around in a Hurry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 Movement by Screens 35 Movement by Text Blocks 38 Movement by Searches 39 Movement by Line Number 43 Review of vi Motion Commands 44 4. Beyond the Basics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47 More Command Combinations 47 Options When Starting vi 48 Making Use of Buffers 51 Marking Your Place 52 Other Advanced Edits 53 Review of vi Buffer and Marking Commands 53 vii 5. Introducing the ex Editor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55 ex Commands 55 Editing with ex 58 Saving and Exiting Files 63 Copying a File into Another File 65 Editing Multiple Files 65 6. Global Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71 Confirming Substitutions 72 Context-Sensitive Replacement 73 Pattern-Matching Rules 74 Pattern-Matching Examples 81 A Final Look at Pattern Matching 89 7. Advanced Editing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95 Customizing vi 95 Executing Unix Commands 99 Saving Commands 103 Using ex Scripts 114 Editing Program Source Code 120 8. Introduction to the vi Clones . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125 And These Are My Brothers, Darrell, Darrell, and Darrell 125 Multiwindow Editing 126 GUI Interfaces 127 Extended Regular Expressions 128 Enhanced Tags 129 Improved Facilities 134 Programming Assistance 138 Editor Comparison Summary 140 Nothing Like the Original 141 A Look Ahead 141 Part II. Vim 9. Vim (vi Improved): An Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145 Overview 146 Where to Get Vim 150 Getting Vim for Unix and GNU/Linux 151 Getting Vim for Windows Environments 156 Getting Vim for the Macintosh Environment 157 Other Operating Systems 157 viii | Table of Contents Aids and Easy Modes for New Users 157 Summary 158 10. Major Vim Improvements over vi . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 159 Built-in Help 159 Startup and Initialization Options 160 New Motion Commands 167 Extended Regular Expressions 169 Customizing the Executable 171 11. Multiple Windows in Vim . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 173 Initiating Multiwindow Editing 174 Opening Windows 177 Moving Around Windows (Getting Your Cursor from Here to There) 180 Moving Windows Around 181 Resizing Windows 183 Buffers and Their Interaction with Windows 186 Playing Tag with Windows 190 Tabbed Editing 191 Closing and Quitting Windows 192 Summary 193 12. Vim Scripts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 195 What’s Your Favorite Color (Scheme)? 195 Dynamic File Type Configuration Through Scripting 205 Some Additional Thoughts About Vim Scripting 213 Resources 218 13. Graphical Vim (gvim) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 219 General Introduction to gvim 220 Customizing Scrollbars, Menus, and Toolbars 225 gvim in Microsoft Windows 236 gvim in the X Window System 237 GUI Options and Command Synopsis 237 14. Vim Enhancements for Programmers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 239 Folding and Outlining (Outline Mode) 240 Auto and Smart Indenting 251 Keyword and Dictionary Word Completion 259 Tag Stacking 268 Syntax Highlighting 270 Compiling and Checking Errors with Vim 279 Some Final Thoughts on Vim for Writing Programs 284 Table of Contents | ix 15. Other Cool Stuff in Vim . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 285 Editing Binary Files 285 Digraphs: Non-ASCII Characters 287 Editing Files in Other Places 289 Navigating and Changing Directories 290 Backups with Vim 292 HTML Your Text 293 What’s the Difference? 294 Undoing Undos 296 Now, Where Was I? 297 What’s My Line (Size)? 300 Abbreviations of Vim Commands and Options 302 A Few Quickies (Not Necessarily Vim-Specific) 303 More Resources 304 Part III. Other vi Clones 16. nvi: New vi . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 307 Author and History 307 Important Command-Line Arguments 308 Online Help and Other Documentation 309 Initialization 309 Multiwindow Editing 310 GUI Interfaces 311 Extended Regular Expressions 311 Improvements for Editing 312 Programming Assistance 315 Interesting Features 315 Sources and Supported Operating Systems 315 17. Elvis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 317 Author and History 317 Important Command-Line Arguments 317 Online Help and Other Documentation 319 Initialization 319 Multiwindow Editing 320 GUI Interfaces 323 Extended Regular Expressions 328 Improved Editing Facilities 328 Programming Assistance 332 Interesting Features 335 elvis Futures 340 x | Table of Contents Sources and Supported Operating Systems 340 18. vile: vi Like Emacs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 343 Authors and History 343 Important Command-Line Arguments 344 Online Help and Other Documentation 345 Initialization 346 Multiwindow Editing 347 GUI Interfaces 349 Extended Regular Expressions 357 Improved Editing Facilities 359 Programming Assistance 365 Interesting Features 368 Sources and Supported Operating Systems 374

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