jsp+sql智能道路交通信息管理系?文献翻译 - 百度文库

ʱ : jsp+sql智能道路交通信息管理系?文献翻译 - 百度文库ϿʼĶ

jdbc:mysql://localhost/test org.gjt.mm.mysql.Driver <%-- insert a row into the database --%> insert counters(page,hitCount) values('<%=request.getRequestURI()%>', 0) <%-- the insert may fail, but the page will continue --%> <%-- update the hit counter --%> update counters set hitCount = hitCount + 1 where page like '<%=request.getRequestURI()%>' <%-- execute the query --%>

This page has been hit <%-- query the hit counter --%> select hitCount from counters where page like '<%=request.getRequestURI()%>' <%-- process only the first row of the query --%> times. The page counter is implemented using the Jakarta Project's DBTags tag library, calling JDBC indirectly.

<%-- close a database connection --%> Ҳ˽㣬һʧǿǸscripletӺҪҲ֪ǷHTML߻ˣȵȡأϾǵĽ飺dzȥscripletΪƱǩ

ûиڱǩǣǩ ơǩⶼԼʱڣɳԱдԱģЩǩӸijԱ⣬ǵģͺķDBTagsǺܺõַ֧롣Sql:getColumnǩjsp:getProperty¼ơDBTagsֱӷСʹúҪıʱDBTagsעListing 3Listing 4е߼IJͬDBTagsִJDBCĸıǩʾʽֻвѯſԱһءζ֪жб

չƱǩ൱ֱӵģȷʵҪķһЩʱ;ҾƽǩscriptletsǩΪԲͣŰЩscriptletsתΪǩһѡķAllaireJRun Server Tags(JST),ʹÿԭʼǩΪһJSPҳ档JSTʱתЩҳΪǩˣJSTԵ ڿͻҳ档Allaire˵JSTĿǿֲԱJ2EEŵijԱƽǵ桱,JSTڽJRunпáʱ佫֤JSTǷΪǸͨõĹߡͬʱǷscriptletΪǵҵ߼춨õĻ߼ԺǰǨƳΪǴࡣ ¡ˣתUpdateinsert䣻dzԲһµļ¼ǿκδ󣬲ڽִи¡

ƽؿDBTagsǩ⣬һԳԱкıǩ⡣ԸIJ㣬ṩһ൱JDBCƻDZصȻڣ

ǩṩĹֱתJDBCͬijЩ쳣ǩⲻṩκδscriptletsȡȷʵӹз

ˣⲻʹscriptletʹñǣⲻǷ빦ܺͱʾԭ򣬶ǽҪʵ˵Ϊʾҳṩ߼ĹܡΪscriptletԭڣݶ壬scriptlet DẒǿԱʾ߼

2.5 ԱʾҳJDBC

JDBCͬJSPʱϣԱʾ߾ܶظüɡݿĵطϣǡij󼶱Щһǵһʾ

嵥5еʾУǶԱʾҳJDBCɡҳ ʵʰ汾λJavaServer Pages Developers Guide Webվ㣩 嵥5 JDBCJSPҳ JDBC hidden example

This page has been hit hitCounter.jspļûݿscriptletǻֻһtaglibαָֻҪΪʾҳ潨ԤڻĶΪݡԸ⣬԰getProperty滻ɶƱǣ磺

This page has been hit times. ǰЩʾ˵ÿҳ涼ִݿDzҪĿʾ˵ʵϣԺַʽֵͨڶƱǾͰѸʵֳǿԾۼʱϢԵĸݿ⣨磬ÿλỰʱ洢ʽݿDZģҲԱʾҳˡDevTechʵֵķʽbeanʵֵģʽΪǰѸΪϵǵҳ

2.6 JavaBean

ĿǰΪֹʾһֱ൱򵥣ݿЩ򵥵IJѯ͸ҪӡˣȻѾ˰JDBCJSPҳһЩԭ򣬾һ΢Щ϶ͨõһӦƪ¡

һֵʾ嵥9ָһַ֧WebվϷṩݡ仰˵ϣ߶ȡijһURIݿݲ׫дݡڵWebվ൱ͬĻֿڹ죺

? ? ? ?

ҳ棬Amazon.comҵЩҳ ҳ Wikiweb

ͨɲͬԱдJSP΢پϸЩİ汾ͿʵֿȥȻͬWebҳ档Щҳ濴ȥΨһ֮ͬڷ׫дݡ

ǵannotationעͣʾʹHTMLHTMLJSPʱʹӳ䵽bean÷ˡʹsetPropertyǿԱϷ 嵥6 ӳ䵽Beanʵ <%-- setup a bean instance that matches our form --%>

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