pomelo连接mySQL

准备工作：
已安装mysql 的windows版本
先安装依赖库

npm install mysql
npm install generic-pool

创建文件：

250bede596931142bef0ab31e7aa08c0.png

如图中所示建立shared文件夹，在shared文件夹下建立config文件夹，在config文件夹下创建mysql.json数据库配置文件，在shared文件夹下创建mysql.js和sqlPool.js两个脚本，脚本内容在下面。
mysql.json配置

{
  "development": {
    "host" : "127.0.0.1",//ip
    "port" : "3306",//端口
    "database" : "user",//数据库名称
    "user" : "dev",//帐号
    "password" : "123456"//密码
  },
  "production": {
    "host" : "127.0.0.1",
    "port" : "3306",
    "database" : "user",
    "user" : "dev",
    "password" : "123456"
  }
}

mysql.js代码

var sqlclient = module.exports;
var _pool;
var NND = {};

/*
 * Init sql connection pool
 * @param {Object} app The app for the server.
 */
NND.init = function(app){
    _pool = require('./sqlPool').createMysqlPool(app);
};

/**
 * Excute sql statement
 * @param {String} sql Statement The sql need to excute.
 * @param {Object} args The args for the sql.
 * @param {fuction} cb Callback function.
 * 
 */
NND.query = function (sql, args, cb) {
    const resourcePromise = _pool.acquire();
    resourcePromise.then(function (client) {
    client.query(sql, args, function (err, res) {
    _pool.release(client);
    cb(err, res);
    });
    }).catch(function (err) {
    // handle error - this is generally a timeout or maxWaitingClients
    // error
    console.log("errr... query", err);
    cb(err);
    });
    };

/**
 * Close connection pool.
 */
NND.shutdown = function(){
    _pool.destroyAllNow();
};

/**
 * init database
 */
sqlclient.init = function(app) {
    if (!!_pool){
        return sqlclient;
    } else {
        NND.init(app);
        sqlclient.insert = NND.query;
        sqlclient.update = NND.query;
        sqlclient.delete = NND.query;
        sqlclient.query = NND.query;
        return sqlclient;
    }
};

/**
 * shutdown database
 */
sqlclient.shutdown = function(app) {
    NND.shutdown(app);
};

sqlPool.js代码

//sqlPool.js
var genericPool = require('generic-pool');
var mysql = require("mysql");

/*
* Create mysql connection pool.
*/
var createMysqlPool = function (app) {
var mysqlConfig = app.get('mysql');

const factory = {
    create: function () {
        return new Promise(function (resolve, reject) {

            var client = mysql.createConnection({
                host: mysqlConfig.host,
                user: mysqlConfig.user,
                password: mysqlConfig.password,
                database: mysqlConfig.database
            });
            client.connect();
            resolve(client);
        });
    },
    destroy: function (client) {
        return new Promise(function (resolve) {
            client.on( function () {
                resolve();
            });
            client.disconnect();
        })
    }
};

var opts = {
    max: 10, // maximum size of the pool
    min: 1 // minimum size of the pool
};


return genericPool.createPool(factory, opts);
};
exports.createMysqlPool = createMysqlPool;

在game-server的app.js中添加如下配置

app.loadConfig("mysql", app.getBase() + "/shared/config/mysql.json"); // 添加配置

app.configure('production|development', "connector|game", function () {
    var dbclient = require("./shared/mysql.js").init(app); // 初始化dbclient
    app.set("dbclient", dbclient);// dbclient 为外部数据库接口，app,get("dbclient") 来使用
})

调用方法如下

var sql = " insert into user (account, password) VALUES(?, ?)";
var args = [msg.account, msg.password];
var dbclient = pomelo.app.get('dbclient');//获取全局mysql client
        
dbclient.query(sql, args, function (err, res) {//执行sql语句 函数insert和query等效
    next(null, {
        code: 0
    });     
});