node+express框架中连接使用mysql(经验总结)

$ npm install -g express-generator
$ express -e project

$ npm install
$ DEBUG=node-blog:* npm start

npm install mysql --save-dev

//mysql配置文件
mysql = {

    host: "xx.xxx.xx.xxx", //这是数据库的地址

    user: "xxx", //需要用户的名字

    password: "xxx", //用户密码 ，如果你没有密码，直接双引号就是

    database: "xxx" //数据库名字

  } //好了，这样我们就能连接数据库了

  module.exports = mysql; //用module.exports暴露出这个接口，
mysql连接池配置：

//mysql连接池配置文件
var mysql = require('mysql');
var $dbConfig = require('../config/mysql');//注意改成自己项目中mysql配置文件的路径

// 使用连接池，避免开太多的线程，提升性能
var pool = mysql.createPool($dbConfig);

/**
 * 对query执行的结果自定义返回JSON结果
 */
function responseDoReturn(res, result, resultJSON) {
  if (typeof result === 'undefined') {
    res.json({
      code: '201',
      msg: 'failed to do'
    });
  } else {
    res.json(result);
  }
};

/**
 * 封装query之sql带不占位符func
 */
function query(sql, callback) {
  pool.getConnection(function(err, connection) {
    connection.query(sql, function(err, rows) {
      callback(err, rows);
      //释放链接
      connection.release();
    });
  });
}

/**
 * 封装query之sql带占位符func
 */
function queryArgs(sql, args, callback) {
  pool.getConnection(function(err, connection) {
    connection.query(sql, args, function(err, rows) {
      callback(err, rows);
      //释放链接
      connection.release();
    });
  });
}

//exports
module.exports = {
  query: query,
  queryArgs: queryArgs,
  doReturn: responseDoReturn
}

let express = require('express');
let mysql = require('../common/basicConnection');

let qibu_task = {
  index: '',
  value: '',
  list: `SELECT * from qibu_task;`, //列表查询
  insert(args) {
    qibu_task.index = '';
    qibu_task.value = '';
    args = filter(['id', 'task', 'name', 'created_at'], args)
    for (let key in args) {
      qibu_task.index = `${qibu_task.index}${key},`
      let re = /^[0-9]+.?[0-9]*/;
      if (re.test(args[key])) {
        qibu_task.value = `${qibu_task.value}${args[key]},`
      } else {
        qibu_task.value = `${qibu_task.value}'${args[key]}',`
      }
    }
    qibu_task.index = qibu_task.index.substr(0, qibu_task.index.length - 1);
    qibu_task.value = qibu_task.value.substr(0, qibu_task.value.length - 1);

    return `INSERT INTO qibu_task (${qibu_task.index}) VALUES(${qibu_task.value})`;
  }, //按需增加
  select(index, value) {
    return `SELECT * from qibu_task where ${index}=${value};` //按需查询
  },
  delete(index, value) {
    return `DELETE from qibu_task where ${index}=${value};` //按需删除
  },
  update(index, args) { //提交修改
    if (index in args) {
      qibu_task.value = '';
      args = filter(['id', 'task', 'name', 'created_at'], args)
      for (let key in args) {
        let re = /^[0-9]+.?[0-9]*/;
        if (re.test(args[key])) {
          qibu_task.value = `${qibu_task.value}${key}=${args[key]},`
        } else {
          qibu_task.value = `${qibu_task.value}${key}='${args[key]}',`
        }
      }
      qibu_task.value = qibu_task.value.substr(0, qibu_task.value.length - 1)
      return `UPDATE qibu_task SET ${qibu_task.value} WHERE ${index}=${args[index]};`
    }
  },
};
//参数过滤
function filter(arguments, obj) {
  let newObj = {}
  arguments.forEach(every => {
    if (every in obj) {
      newObj[every] = obj[every]
    }
  });
  return newObj;
};
module.exports = qibu_task;