知识大全 Groovy入门—Grails实战之遗留数据库处理

Posted 2022-07-14 数据库

篇首语：生也有涯，知也无涯。本文由小常识网(cha138.com)小编为大家整理，主要介绍了知识大全 Groovy入门—Grails实战之遗留数据库处理相关的知识，希望对你有一定的参考价值。

Groovy入门—Grails实战之遗留数据库处理 以下文字资料是由(全榜网网www.cha138.com)小编为大家搜集整理后发布的内容，让我们赶快一起来看一下吧！

由于在过去一段时间内已有多位朋友向我询问如何用Grails处理遗留数据库为了回答这个问题我给出一个实例并适当讲解不足之处敬请谅解

　　我使用的数据库为MySQL 其中存在一个名为legacy_dev的schema legacy_dev中有一张表叫user

　　创建Grails应用程序我将它命名为legacy grails create app legacy

　　创建一个域类User grails create domain class User

　　修改grails app\\domain\\User groovy的内容如下所示

　　　　class User 　　String userId 　　String password 　　static constraints = 　　userId(blank: false maxSize: ) 　　password(blank: false maxSize: ) 　　　　

　　生成与域类User相关的所有Grails应用程序工件(artifact) grails generate all User

　　将grails app\\conf\\DevelopmentDataSource groovy的内容改为

　　　　class DevelopmentDataSource 　　boolean pooling = true 　　// 将这行注释掉　　// String dbCreate = update // one of create create drop update 　　// url和driver要正确　　String url = jdbc:mysql://localhost: /legacy_dev 　　String driverClassName = mysql jdbc Driver 　　String username = root 　　String password = // 这里为您的密码 :) 　　

　　自行配置Hibernate

　　hibernate cfg xml

　　 <? xml version= encoding= UTF ?> <! DOCTYPE hibernate configuration PUBLIC //Hibernate/Hibernate Configuration DTD //EN configuration dtd > < hibernate configuration > < session factory > < property name = connection driver_class > mysql jdbc Driver </ property > < property name = connection url > jdbc:mysql://localhost: /legacy_dev </ property > < property name = connection username > root </ property > < property name = connection password ></ property > < property name = connection pool_size > </ property > < property name = dialect > hibernate dialect MySQLDialect </ property > < property name = current_session_context_class > thread </ property > < property name = cache provider_class > hibernate cache NoCacheProvider </ property > < property name = show_sql > true </ property > < property name = hbm ddl auto > validate </ property > < mapping resource = User hbm xml /> </ session factory > </ hibernate configuration >

　　User hbm xml

　　 <? xml version= ?> <! DOCTYPE hibernate mapping PUBLIC //Hibernate/Hibernate Mapping DTD //EN mapping dtd > < hibernate mapping > < class name = User table = user > < id name = userId column = user_id type = java lang String length = > <generator class= assigned /> </id> <property name= password column= password type= java lang String length= /> </class> </hibernate mapping>

　　最后别忘了修改grails app\\controllers\\UserController groovy以及各GSP的代码

　　(试验代码时请不要在Edit User页面中更新用户的userId 否则出发生异常因为主键不可更改

　　在自己的应用程序中可以disable掉Edit User页面中的User Id文本域)

　　UserController groovy

　　　　class UserController 　　def index = redirect(action:list params:params) 　　// the delete save and update actions only 　　// accept POST requests 　　def allowedMethods = [delete: POST 　　save: POST 　　update: POST ] 　　def list = 　　if ( ! params max)params max = 　　[ userList: User list( params ) ] 　　　　def show = 　　// [ user : User get( params id ) ] 　　[ user : User findByUserId(params id) ] 　　　　def delete = 　　// def user = User get( params id ) 　　def user = User findByUserId(params id) 　　if (user) 　　user delete() 　　ssage = User $params id deleted 　　redirect(action:list) 　　　　else 　　ssage = User not found with id $params id 　　redirect(action:list) 　　　　　　def edit = 　　// def user = User get( params id ) 　　def user = User findByUserId(params id) 　　if ( ! user) 　　ssage = User not found with id $params id 　　redirect(action:list) 　　　　else 　　return [ user : user ] 　　　　　　def update = 　　// def user = User get( params id ) 　　def user = User findByUserId(params id) 　　if (user) 　　user properties = params 　　if (user save()) 　　// redirect(action:show id:user id) 　　redirect(action:show id:user userId) 　　　　else 　　render(view: edit model:[user:user]) 　　　　　　else 　　ssage = User not found with id $params id 　　redirect(action:edit id:params id) 　　　　　　def create = 　　def user = new User() 　　user properties = params 　　return [ user :user] 　　　　def save = 　　def user = new User() 　　user properties = params 　　if (user save()) 　　// redirect(action:show id:user id) 　　redirect(action:show id:user userId) 　　　　else 　　render(view: create model:[user:user]) 　　　　　　

　　grails app\\views\\user\\list gsp

　　 < > < head > < meta equiv = Content Type content = text/; charset=UTF /> < meta name = layout content = main /> < title > User List </ title > </ head > < body > < div class = nav > < span class = menuButton >< a href = $createLinkTo(dir: ) > Home </ a ></ span > < span class = menuButton >< g:link action = create > New User </ g:link ></ span > </ div > < div class = body > < h > User List </ h > < g:if test = $ssage > < div class = message > $ssage </ div > </ g:if > < table > < thead > < tr > <! <g:sortableColumn property= id title= Id /> > < g:sortableColumn property = userId title = User Id /> < g:sortableColumn property = password title = Password /> < th ></ th > </ tr > </ thead > < tbody > < g:each in = $userList > < tr > <! <td>$it id? encodeAsHTML()</td> > < td > $it userId? encodeAsHTML() </ td > < td > $it password? encodeAsHTML() </ td > < td class = actionButtons > <! <span class= actionButton ><g:link action= show id= $it id >Show</g:link></span> > < span class = actionButton >< g:link action = show id = $it userId > Show </ g:link ></ span > </ td > </ tr > </ g:each > </ tbody > </ table > < div class = paginateButtons > < g:paginate total = $unt() /> </ div > </ div > </ body > </ >

　　grails app\\views\\user\\show gsp

　　 < > < head > < meta equiv = Content Type content = text/; charset=UTF /> < meta name = layout content = main /> < title > Show User </ title > </ head > < body > < div class = nav > < span class = menuButton >< a href = $createLinkTo(dir: ) > Home </ a ></ span > < span class = menuButton >< g:link action = list > User List </ g:link ></ span > < span class = menuButton >< g:link action = create > New User </ g:link ></ span > </ div > < div class = body > < h > Show User </ h > < g:if test = $ssage > < div class = message > $ssage </ div > </ g:if > < div class = dialog > < table > < tbody > <! <tr class= prop > <td valign= top class= name >Id:</td> <td valign= top class= value >$user id</td> </tr> > < tr class = prop > < td valign = top class = name > User Id: </ td > < td valign = top class = value > $user userId </ td > </ tr > < tr class = prop > < td valign = top class = name > Password: </ td > < td valign = top class = value > $user password </ td > </ tr > </ tbody > </ table > </ div > < div class = buttons > < g:form controller = user > <! <input type= hidden name= id value= $user? id /> > < input type = hidden name = id value = $user? userId /> < span class = button >< g:actionSubmit value = Edit /></ span > < span class = button >< g:actionSubmit value = Delete /></ span > </ g:form > </ div > </ div > </ body > </ >

　　grails app\\views\\user\\create gsp

　　 < > < head > < meta equiv = Content Type content = text/; charset=UTF /> < meta name = layout content = main /> < title > Create User </ title > </ head > < body > < div class = nav > < span class = menuButton >< a href = $createLinkTo(dir: ) > Home </ a ></ span > < span class = menuButton >< g:link action = list > User List </ g:link ></ span > </ div > < div class = body > < h > Create User </ h > < g:if test = $ssage > < div class = message > $ssage </ div > </ g:if > < g:hasErrors bean = $user > < div class = errors > < g:renderErrors bean = $user as = list /> </ div > </ g:hasErrors > < g:form action = save method = post > < div class = dialog > < table > < tbody > < tr class = prop >< td valign = top class = name >< label for = userId > User Id: </ label ></ td > < td valign = top class = value $hasErrors(bean:user field: userId errors ) > < input type = text name = userId value = $user? userId? encodeAsHTML() /> </ td ></ tr > < tr class = prop > < td valign = top class = name >< label for = password > Password: </ label ></ td >< td valign = top class = value $hasErrors(bean:user field: password errors ) >< input type = text name = password value = $user? password? encodeAsHTML() /></ td ></ tr > </ tbody > </ table > </ div > < div class = buttons > < span class = formButton > < input type = submit value = Create ></ input > </ span > </ div > </ g:form > </ div > </ body > </ >

　　grails app\\views\\user\\edit gsp

　　 < > < head > < meta equiv = Content Type content = text/; charset=UTF /> < meta name = layout content = main /> < title > Edit User </ title > </ head > < body > < div class = nav > < span class = menuButton >< a href = $createLinkTo(dir: ) > Home </ a ></ span > < span class = menuButton >< g:link action = list > User List </ g:link ></ span > < span class = menuButton >< g:link action = create > New User </ g:link ></ span > </ div > < div class = body > < h > Edit User </ h > < g:if test = $ssage > < div class = message > $ssage </ div > </ g:if > < g:hasErrors bean = $user > < div class = errors > < g:renderErrors bean = $user as = list /> </ div > </ g:hasErrors > <! <div class= prop > <span class= name >Id:</span> <span class= value >$user? id</span> </div> > < g:form controller = user method = post > <! <input type= hidden name= id value= $user? id /> > < input type = hidden name = id value = $user? userId /> < div class = dialog > < table > < tbody > < tr class = prop >< td valign = top class = name > < label for = userId > User Id: </ label ></ td > < td valign = top class = value $hasErrors(bean:user field: userId errors ) > < input type = text name = userId value = $user? userId? encodeAsHTML() /> </ td ></ tr > < tr class = prop >< td valign = top class = name > < label for = password > Password: </ label ></ td > < td valign = top class = value $hasErrors(bean:user field: password errors ) > < input type = text name = password value = $user? password? encodeAsHTML() /> </ td ></ tr > </ tbody > </ table > </ div > < div class = buttons > < span class = button >< g:actionSubmit value = Update /></ span > < span class = button >< g:actionSubmit value = Delete /></ span > </ div > </ g:form > </ div > </ body > </ >

cha138/Article/program/Java/hx/201311/26589