nodejs个人博客开发第三步 载入页面

/模板引擎/ 
application.set('views',__dirname+'/views');
application.engine('.html',require("ejs").__express);
application.set('view engine','html');

/
 首页控制器
/
var router=express.Router();
router.get('/',function(req,res,next){
  /渲染模板/
  res.render("home/index");
});
module.exports=router;

/链接数据库/ 
global.db=require("./model/db").getInstances();

/
 数据库操作类
/
var db={
  /数据库对象/
  db:null,
  /构造函数/
  getInstances:function(){
    this.connectDatabase();
    return this;
  },
  /链接数据库/
  connectDatabase:function(){
    var mysql=require('mysql');
    var db=mysql.createConnection({
      host:C.DB_HOST,
      user:C.DB_USER,
      password:C.DB_PASS,
      database:C.DB_NAME
    });
    db.connect();
    this.db=db;
    this.C=C;
  },
  select:function(tableName,callback,where,field){
    field=field ? field : '';
    var sql="select "+field+" from "+this.C.DB_PRE+tableName;
    if(where){
      sql+=" where "+where;
    }
    this.db.query(sql,callback);
  }
}
module.exports=db;