Grails Documentations

-- curl -s "https://get.sdkman.io" | bash
-- source "$HOME/.sdkman/bin/sdkman-init.sh"
-- sdk install grails 2.5.6
Go to directory where you want to create grail application
-- grails create-app
-- give a name of the application
-- grails run-app
-- connect to mysql database
    
    Datasource : 
    driverClassName = "com.mysql.jdbc.Driver"
    dialect = "org.hibernate.dialect.MySQL5InnoDBDialect"
    username: root
    password: ""
    
    development {
        dataSource {
            dbCreate = "create-drop" // one of 'create', 'create-drop', 'update', 'validate', ''
            //url = "jdbc:h2:mem:devDb;MVCC=TRUE;LOCK_TIMEOUT=10000;DB_CLOSE_ON_EXIT=FALSE"
            url = "jdbc:mysql://localhost/inventory?useUnicode=yes&characterEncoding=UTF-8"
            username = "root"
            password = ""
        }
    }
    
    Build Config
     dependencies {
        runtime 'mysql:mysql-connector-java:5.1.18'
    }
    
    --connect to oracle
    ------------------------
    dataSource {
    pooled = true
    jmxExport = true
    driverClassName = "oracle.jdbc.driver.OracleDriver"
    dialect = org.hibernate.dialect.Oracle10gDialect
    username = "SUERP"
    password = "SoftRithmITBismillah601"
}
-----------------------------
 dataSource {
            dbCreate = ""
            url = "jdbc:oracle:thin:@192.168.0.105:1521:xe"
            logSql = true
        }
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    ?? How to add field in grails domain and at the same time how to migrate it?
    
    one to many relationship
    -----------------------
    static hasMany = [ registrations : Registration,
                       sponsors : Sponsor ]
                       
   # create grails domain : grails create-domain-class   -> give name
   # create grails controller : grails create-controller ->give domain name
   # In controller def scffold = domainName will create all of the crud method and relevent views
   
   Change Port In Grails in BuildConfig.groovy page
   grails.server.port.http = 8090
   
   ## auto increment column add hibernate
   CREATE SEQUENCE HIBERNATE_SEQUENCE
  START WITH 1
  MAXVALUE 9999999999999999999999999999
  MINVALUE 1
  NOCYCLE
  CACHE 20
  NOORDER
  
  #Grails Closure to override class name#
  
  #Change Dropdown display name in grails#
   String toString(){
        return this.name
    }
    
    #Template : grails install-
templates

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Controller
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return of action controller : 
render : 
return :
json return : render list as JSON

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initially insert some test data
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