Koa 连接mysql数据，mysql数据库表初始化脚本

以下脚本是借鉴 chenshenhai 大佬的 Koa 教程中的代码，并对其进行修改。整个初始化步骤作为记录，方便以后快速查阅。

目录结构:

-sql 
    - data.sql 
    - user.sql
- db
    - mysql_config.js  // 数据库配置
    - async_db.js // 数据库的查询和初始化函数
- util
    - get_sql_content_map.js 对sql目录下的 .sql文件内容读取并组合成 Map 映射关系
    - get_sql_map.js
    - walk_file.js
- index.js // 初始化入口文件

sql 目录下

data.sql

CREATE TABLE   IF NOT EXISTS  `data` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `data_info` json DEFAULT NULL,
  `create_time` varchar(20) DEFAULT NULL,
  `modified_time` varchar(20) DEFAULT NULL,
  `level` int(11) DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8

user.sql

CREATE TABLE   IF NOT EXISTS  `user` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `email` varchar(255) DEFAULT NULL,
  `password` varchar(255) DEFAULT NULL,
  `name` varchar(255) DEFAULT NULL,
  `nick` varchar(255) DEFAULT NULL,
  `detail_info` json DEFAULT NULL,
  `create_time` varchar(20) DEFAULT NULL,
  `modified_time` varchar(20) DEFAULT NULL,
  `level` int(11) DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

INSERT INTO `user` set email='1@example.com', password='123456';
INSERT INTO `user` set email='2@example.com', password='123456';
INSERT INTO `user` set email='3@example.com', password='123456';

util 目录下

walk_file.js

// 遍历sql脚本文件
const fs = require("fs");
const path = require("path");

module.exports = waleFile;

/**
 *
 * @param {String} pathResolve
 * @param {String} mime 文件后缀名
 */
function waleFile(pathResolve, mime) {
  const files = fs.readdirSync(pathResolve);

  const fileList = {};

  for (let [i, item] of files.entries()) {
    const ext = path.extname(item).replace(/\./, "");
    if (ext === mime) {
      fileList[item] = path.join(pathResolve, item);
    }
  }

  return fileList;
}

get_sql_map.js

/**
  获取所有sql脚本文件
*/
const path = require("path");
const waleFile = require("./walk_file");

/**
 * @returns {Object}
 */
function getSqlMap() {
  debugger;
  // 当前模块所在的目录地址
  const sqlPath = path.resolve(__dirname, "..", "sql");

  return waleFile(sqlPath, "sql");
}

module.exports = getSqlMap;

get_sql_content_map.js

/**
  获取 sql脚本文件内容
*/
const fs = require("fs");
const getSqlMap = require("./get_sql_map");

const sqlContentMap = {};

function getSqlContent(fileName, path) {
  let content = fs.readFileSync(path, "binary");
  sqlContentMap[fileName] = content;
}

function getSqlContentMap() {
  const sqlMap = getSqlMap();
  for (let key in sqlMap) {
    getSqlContent(key, sqlMap[key]);
  }

  return sqlContentMap;
}

module.exports = getSqlContentMap;

db目录下

对数据库连接和异步查询的封装

mysql_config.js

const mysql = require("mysql");

(function() {
  // 创建数据库会话
  let connection;

  const connect_mysql = () => {
    connection = mysql.createConnection({
      host: "127.0.0.1",
      user: "root",
      password: "abc123",
      database: "koa_demo"
    });
  };

  const getConnection = () => connection;

  module.exports = { getConnection, connect_mysql };
})();

async_db.js

const { getConnection } = require("./mysql_config");

const find = sql => {
  return new Promise((resolve, reject) => {
    getConnection().query(sql, (err, results, fileds) => {
      if (err) return reject(err);

      resolve({
        results,
        fileds
      });
    });
  });
};

module.exports = {
  find
};

index.js 初始化入口文件

const fs = require("fs");
const getSqlContentMap = require("./util/get_sql_content_map");
const { connect_mysql } = require("./db/mysql_config");
const { find } = require("./db/async_db");

connect_mysql();

// 打印脚本执行日志
const eventLog = function(err, sqlFile, index) {
  if (err) {
    console.log(
      `[ERROR] sql脚本文件: ${sqlFile} 第${index + 1}条脚本 执行失败 o(╯□╰)o ！`
    );
  } else {
    console.log(
      `[SUCCESS] sql脚本文件: ${sqlFile} 第${index +
        1}条脚本 执行成功 O(∩_∩)O !`
    );
  }
};

// 获取所有sql脚本内容
const sqlContentMap = getSqlContentMap();

const createAllTables = async () => {
  // key sql 名
  for (let key in sqlContentMap) {
    let sqlShell = sqlContentMap[key];
    let sqlShellList = sqlShell.split(";");

    for (let [i, shell] of sqlShellList.entries()) {
      // 去除 .sql 文件中的注释内容
      shell = shell.replace(/(\/\/.*)|(\/\*[\s\S]*?\*\/)/g, "");
      if ((shell = shell.trim())) {
        const { results } = await find(shell);
        if (results.serverStatus * 1 === 2) {
          eventLog(null, key, i);
        } else {
          eventLog(true, key, i);
        }
      }
    }
  }

  console.log("sql脚本执行结束");
  console.log("请按 ctrl + c 键退出！");
};

createAllTables();

执行 index.js 脚本, 如果在 sql文件书写正确的情况下: Koa 连接mysql数据，mysql数据库表初始化脚本