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;