一个容易的应用(用内置数据库)

一个简单的应用(用内置数据库)
领域类：
1.Race.groovy

package com.rtclass Race {String nameDate startDateString cityString stateBigDecimal distanceBigDecimal costInteger maxRunners=100000static hasMany=[registrations:Registration]    static constraints = {name(blank:false,maxSize:50)startDate(validator:{return(it>new Date())})city()state(inList:["GA","NC","SC","VA"])distance(min:0.0)cost(min:0.0,max:100.0)maxRunners(min:0,max:1000000)    }BigDecimal inMiles(){return distance*0.6214}@Overridepublic String toString() {return "${name},${startDate.format('yyyy/MM/dd')}"}}

2.Registration.groovy

package com.rtclass Registration {Boolean paidDate dateCreatedstatic belongsTo =[race:Race,runner:Runner]static constraints = {race()runner()paid()dateCreated()}@Overridepublic String toString() {return "${race}:${runner}"}}

3.Runner.groovy

package com.rtimport java.util.Date;class Runner {String firstNameString lastNameDate dateOfBirthString genderString addressString cityString stateString zipcodeString emailstatic hasMany=[registrations:Registration]    static constraints = {firstName(blank:false)lastName(blank:false)dateOfBirth()gender(inList:['男','女'])address()city()state()zipcode()email(email:true)    }@Overridepublic String toString() {return "${firstName},${lastName}(${email}"}}

控制器：
1.RaceController.groovy

package com.rtclass RaceController {def scaffold=Race//    def index = { //render "hello world"//}}

2.RegistrationController.groovy

package com.rtclass RegistrationController {def scaffold=true//    def index = { }}

3.RunnerController.groovy

package com.rtclass RunnerController {def scaffold=true}

因为是内置数据库，所以每次重启服务器时，数据就丢失，这是grails内部机制，可以用以下办法在每次服务器启动时保存初始数据到内置数据库：
在grails-app/conf/BootStrap.groovy

import com.rt.Race import com.rt.Registration import com.rt.Runner import grails.util.GrailsUtil;class BootStrap {    def init = { servletContext ->switch(GrailsUtil.environment){case "development":def jane=new Runner(firstName:'三',lastName:'张',dateOfBirth:(new Date()-365*30),gender:'男',address:'地址',city:'hz',state:'NC',zipcode:'123456',email:'jane@163.com')jane.save()jane.errors.each {println it}def trot=new Race(name:'500长跑',startDate:(new Date()+90),city:'HZ',state:'NC',distance:500,cost:20.0,maxRunners:350)trot.save()if(trot.hasErrors()){println trot.errors}def reg=new Registration(paid:false,runner:jane,race:trot)reg.save()reg.errors.each { println it}break}    }    def destroy = {    }}

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