详解nodejs操作mongodb数据库封装DB类

这个DB类也算是我经历了3个实际项目应用的，现分享出来，有需要的请借鉴批评。

上面的注释都挺详细的，我使用到了nodejs的插件mongoose，用mongoose操作mongodb其实蛮方便的。

关于mongoose的安装就是 npm install -g mongoose

这个DB类的数据库配置是基于auth认证的，如果您的数据库没有账号与密码则留空即可。

var fs = require('fs');
var path = require('path');
var mongoose = require('mongoose');
var logger = require('pomelo-logger').getLogger('mongodb-log');

var options = {
  db_user: "game",
  db_pwd: "12345678",
  db_host: "192.168.2.20",
  db_port: 27017,
  db_name: "dbname"
};

var dbURL = "mongodb://" + options.db_user + ":" + options.db_pwd + "@" + options.db_host + ":" + options.db_port + "/" + options.db_name;
mongoose.connect(dbURL);

mongoose.connection.on('connected', function (err) {
  if (err) logger.error('Database connection failure');
});

mongoose.connection.on('error', function (err) {
  logger.error('Mongoose connected error ' + err);
});

mongoose.connection.on('disconnected', function () {
  logger.error('Mongoose disconnected');
});

process.on('SIGINT', function () {
  mongoose.connection.close(function () {
    logger.info('Mongoose disconnected through app termination');
    process.exit(0);
  });
});

var DB = function () {
  this.mongoClient = {};
  var filename = path.join(path.dirname(__dirname).replace('app', ''), 'config/table.json');
  this.tabConf = JSON.parse(fs.readFileSync(path.normalize(filename)));
};


DB.prototype.getConnection = function (table_name) {
  if (!table_name) return;
  if (!this.tabConf[table_name]) {
    logger.error('No table structure');
    return false;
  }

  var client = this.mongoClient[table_name];
  if (!client) {
    //构建用户信息表结构
    var nodeSchema = new mongoose.Schema(this.tabConf[table_name]);

    //构建model
    client = mongoose.model(table_name, nodeSchema, table_name);

    this.mongoClient[table_name] = client;
  }
  return client;
};


DB.prototype.save = function (table_name, fields, callback) {
  if (!fields) {
    if (callback) callback({msg: 'Field is not allowed for null'});
    return false;
  }

  var err_num = 0;
  for (var i in fields) {
    if (!this.tabConf[table_name][i]) err_num ++;
  }
  if (err_num > 0) {
    if (callback) callback({msg: 'Wrong field name'});
    return false;
  }

  var node_model = this.getConnection(table_name);
  var mongooseEntity = new node_model(fields);
  mongooseEntity.save(function (err, res) {
    if (err) {
      if (callback) callback(err);
    } else {
      if (callback) callback(null, res);
    }
  });
};


DB.prototype.update = function (table_name, conditions, update_fields, callback) {
  if (!update_fields || !conditions) {
    if (callback) callback({msg: 'Parameter error'});
    return;
  }
  var node_model = this.getConnection(table_name);
  node_model.update(conditions, {$set: update_fields}, {multi: true, upsert: true}, function (err, res) {
    if (err) {
      if (callback) callback(err);
    } else {
      if (callback) callback(null, res);
    }
  });
};


DB.prototype.updateData = function (table_name, conditions, update_fields, callback) {
  if (!update_fields || !conditions) {
    if (callback) callback({msg: 'Parameter error'});
    return;
  }
  var node_model = this.getConnection(table_name);
  node_model.findOneAndUpdate(conditions, update_fields, {multi: true, upsert: true}, function (err, data) {
    if (callback) callback(err, data);
  });
};


DB.prototype.remove = function (table_name, conditions, callback) {
  var node_model = this.getConnection(table_name);
  node_model.remove(conditions, function (err, res) {
    if (err) {
      if (callback) callback(err);
    } else {
      if (callback) callback(null, res);
    }
  });
};


DB.prototype.find = function (table_name, conditions, fields, callback) {
  var node_model = this.getConnection(table_name);
  node_model.find(conditions, fields || null, {}, function (err, res) {
    if (err) {
      callback(err);
    } else {
      callback(null, res);
    }
  });
};


DB.prototype.findOne = function (table_name, conditions, callback) {
  var node_model = this.getConnection(table_name);
  node_model.findOne(conditions, function (err, res) {
    if (err) {
      callback(err);
    } else {
      callback(null, res);
    }
  });
};


DB.prototype.findById = function (table_name, _id, callback) {
  var node_model = this.getConnection(table_name);
  node_model.findById(_id, function (err, res){
    if (err) {
      callback(err);
    } else {
      callback(null, res);
    }
  });
};


DB.prototype.count = function (table_name, conditions, callback) {
  var node_model = this.getConnection(table_name);
  node_model.count(conditions, function (err, res) {
    if (err) {
      callback(err);
    } else {
      callback(null, res);
    }
  });
};


DB.prototype.distinct = function (table_name, field, conditions, callback) {
  var node_model = this.getConnection(table_name);
  node_model.distinct(field, conditions, function (err, res) {
    if (err) {
      callback(err);
    } else {
      callback(null, res);
    }
  });
};


DB.prototype.where = function (table_name, conditions, options, callback) {
  var node_model = this.getConnection(table_name);
  node_model.find(conditions)
    .select(options.fields || '')
    .sort(options.sort || {})
    .limit(options.limit || {})
    .exec(function (err, res) {
      if (err) {
        callback(err);
      } else {
        callback(null, res);
      }
    });
};

module.exports = new DB();

这个类库使用方法如下：

//先包含进来
var MongoDB = require('./mongodb');

//查询一条数据
MongoDB.findOne('user_info', {_id: user_id}, function (err, res) {
  console.log(res);
});

//查询多条数据
MongoDB.find('user_info', {type: 1}, {}, function (err, res) {
  console.log(res);
});

//更新数据并返回结果集合
MongoDB.updateData('user_info', {_id: user_info._id}, {$set: update_data}, function(err, user_info) {
   callback(null, user_info);
});

//删除数据
MongoDB.remove('user_data', {user_id: 1});

就先举这些例子，更多的可亲自尝试吧！

其中配置中的 config/table.json 是数据库集合的配置项，结构如下：

{
"user_stats_data": {
    "user_id": "Number",
    "platform": "Number",
    "user_first_time": "Number",
    "create_time": "Number"
  },
  "room_data": {
    "room_id": "String",
    "room_type": "Number",
    "user_id": "Number",
    "player_num": "Number",
    "diamond_num": "Number",
    "normal_settle": "Number",
    "single_settle": "Number",
    "create_time": "Number"
  },
  "online_data": {
    "server_id": "String",
    "pf": "Number",
    "player_num": "Number",
    "room_list": "String",
    "update_time": "Number"
  }
}

记得每次给添加字段时，要往这个table.json里面添加。由于nodejs这个服务器的改动，更改table.json往往需要重启游戏服务的。

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持编程网。