Grails Quick Start

安装 grails

安装方式很多

• 官网安装 https://grails.org/documentation.html
• 本机是 mac os 选择用 homebrew 安装的

brew install grails

创建项目

使用 grails 命令 创建项目:

grails create-app my-project

项目目录 :

%PROJECT_HOME%
    + grails-app
       + conf                 ---> location of configuration artifacts 
           + hibernate        ---> optional hibernate config
           + spring           ---> optional spring config
       + controllers          ---> location of controller artifacts
       + domain               ---> location of domain classes
       + i18n                 ---> location of message bundles for i18n
       + services             ---> location of services
       + taglib               ---> location of tag libraries
       + util                 ---> location of special utility classes 
       + views                ---> location of views
           + layouts          ---> location of layouts
   + lib
   + scripts                  ---> scripts
   + src
       + groovy               ---> optional; location for Groovy source files
                                   (of types other than those in grails-app/*)
       + java                 ---> optional; location for Java source files
   + test                     ---> generated test classes
   + web-app
       + WEB-INF

创建领域类

cd my-project
grails create-domain-class org.example.Book

编辑类 添加一些属性

package org.example
class Book {
    String title
    String author

    static constraints = {
        title(blank: false)
        author(blank: false)
    }
}

constraints函数中可以添加一些约束

创建控制器

grails create-controller org.example.Book // Note the capital B

简单的 controller

    def index={
        //在控制器中定义的任何一个闭包都会暴露成一个 url
        render "Hello World"
    }

你会看到 “Hello World”。

来个更高级的：
如果定义了scaffold grails 会给自动创建 CUDR 的逻辑是不是很神奇？

package org.example
class BookController {
    def scaffold = Book // Note the capital "B"
}

运行

grails run-app

访问 http://localhost:8080 你看到了什么 BookController 点进去就是它的 CRUD 了

访问 http://localhost:8080/test Hello world

连接数据库

dataSource:
    pooled: true
    jmxExport: true
    driverClassName: org.postgresql.Driver
    username: changeme
    password: changeme
    
environments:
    development:
        dataSource:
            dbCreate: create-drop
            url: jdbc:postgresql://10.32.150.91:5432/psyco