[nodejs] nodejs开发个人博客（三）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;