Nodejs 操作 Sql Server

Intro

最近项目需要爬取一些数据，数据有加密，前端的js又被混淆了，ajax请求被 hook 了，有些复杂，最后打算使用 puppeteer 来爬取数据。

Puppeteer 是谷歌团队在维护的一个项目，初衷主要是用来做网页的自动化测试， Google Chrome 团队官方的无界面（Headless）Chrome 工具，它是一个 Node 库，提供了一个高级的 API 来控制 DevTools协议上的无头版 Chrome ，也可以配置为使用完整（非无头）的 Chrome。这里就不详细介绍了，有兴趣的可以自己先行 Google 一下，之后再写一篇文章来介绍，今天主要介绍 node 操作 mssql。

node-mssql

个人比较喜欢 async/await 语法。

基本用法：

let pool = await sql.connect(config);
// sql
let result1 = await pool.request()
            .input('input_parameter', sql.Int, value)
            .query('select * from mytable where id = @input_parameter');

// 存储过程
let result2 = await pool.request()
            .input('input_parameter', sql.Int, value)
            .output('output_parameter', sql.VarChar(50))
            .execute('procedure_name');

封装

虽然提供比较完善的方法，但是如果用起来的话还是会觉得用起来有些不舒服，没有那么流畅，没有那么简洁，于是想自己封装一层

const mssql = require("mssql");
const log4js = require("log4js");
const logger = log4js.getLogger("dbUtil");

const connConfig = {
    user: "db user",
    password: "password",
    server: "server",
    database: "database name",
    connectionTimeout: 120000,
    requestTimeout: 3000000,
    retryTimes: 3,
    options: {
        encrypt: true
    },
    pool: {
        max: 1024,
        min: 1,
        idleTimeoutMillis: 30000
    }
};

mssql.on('error', err => {
    // ... error handler
    logger.error(err);
});
let connectionPool;

var getConnection = async function(){//连接数据库
    if(!(connectionPool && connectionPool.connected)) {
        connectionPool = await mssql.connect(connConfig);
    }
    return connectionPool;
}

var querySql = async function (sql, params) {//写sql语句自由查询
    await mssql.close();// close
    var pool = await getConnection();
    var request = pool.request();
    if (params) {
        for (var index in params) {
            if (typeof params[index] == "number") {
                request.input(index, mssql.Int, params[index]);
            } else if (typeof params[index] == "string") {
                request.input(index, mssql.NVarChar, params[index]);
            }
        }
    }
    var result = await request.query(sql);
    await mssql.close();// close
    return result;
};

var add = async function (addObj, tableName) {//添加数据
    if(!addObj){
        return;
    }    
    await mssql.close();// close
    var connection = await getConnection();
    var request = connection.request();

    var sql = "insert into " + tableName + "(";
    for (var index in addObj) {
        if (typeof addObj[index] == "number") {
            request.input(index, mssql.Int, addObj[index]);
        } else if (typeof addObj[index] == "string") {
            request.input(index, mssql.NVarChar, addObj[index]);
        }
        sql += index + ",";
    }
    sql = sql.substring(0, sql.length - 1) + ") values(";
    for (var index in addObj) {
        if (typeof addObj[index] == "number") {
            sql += "@" + index + ",";
        } else if (typeof addObj[index] == "string") {
            sql += "@" + index + ",";
        }
    }
    sql = sql.substring(0, sql.length - 1) + ")";

    var result = await request.query(sql);
    await mssql.close();// close
    return result;
};

var addIfNotExist = async function (addObj, whereObj, tableName) {//添加数据
    if(!addObj){
        return;
    }
    if(!whereObj){
        return await add(addObj, tableName);
    }
    await mssql.close();// close
    var connection = await getConnection();
    var request = connection.request();

    let sql = `BEGIN
    IF NOT EXISTS (SELECT 1 FROM ${tableName} WHERE 1 > 0`;

    for(var index in whereObj){
        if (typeof addObj[index] == "number") {
            request.input(index+'Where', mssql.Int, whereObj[index]);
        } else if (typeof addObj[index] == "string") {
            request.input(index+'Where', mssql.NVarChar, whereObj[index]);
        }
        sql += ` AND ${index} = @${index}Where`
    }
    sql+= ')';

    sql += 'BEGIN ';
    sql += "INSERT INTO " + tableName + "(";
    for (var index in addObj) {
        if (typeof addObj[index] == "number") {
            request.input(index, mssql.Int, addObj[index]);
        } else if (typeof addObj[index] == "string") {
            request.input(index, mssql.NVarChar, addObj[index]);
        }
        sql += index + ",";
    }
    sql = sql.substring(0, sql.length - 1) + ") values(";
    for (var index in addObj) {
        if (typeof addObj[index] == "number") {
            sql += "@" + index + ",";
        } else if (typeof addObj[index] == "string") {
            sql += "@" + index + ",";
        }
    }
    sql = sql.substring(0, sql.length - 1) + ")";

    sql += `   END
    END`;

    var result = await request.query(sql);
    await mssql.close();// close
    return result;
};


var addList = async function (addObjs, tableName) {//添加数据
    if(!addObjs || addObjs.length == 0){
        return;
    }
    await mssql.close();// close
    var connection = await getConnection();
    var sql = "INSERT INTO " + tableName + "(";
    if (addObjs) {
        let addObj = addObjs[0];
        for (var index in addObj) {
            sql += index + ",";
        }
        sql = sql.substring(0, sql.length - 1) + ") VALUES";
        addObjs.forEach(addObj => {
            sql = sql + "(";
            for (var index in addObj) {
                if (typeof addObj[index] == "number") {
                    sql += addObj[index] + ",";
                } else if (typeof addObj[index] == "string") {
                    sql += "N'" + addObj[index] + "'" + ",";
                }
            }
            sql = sql.substring(0, sql.length - 1) + "),";
        });
    }
    sql = sql.substring(0, sql.length - 1);
    // logger.info(sql);
    var result = await connection.request().query(sql);
    await mssql.close();// close
    return result;
};

var update = async function (updateObj, whereObj, tableName) {//更新数据
    await mssql.close();// close
    var connection = await getConnection();
    var request = connection.request();

    var sql = "UPDATE " + tableName + " SET ";
    if (updateObj) {
        for (var index in updateObj) {
            if (typeof updateObj[index] == "number") {
                request.input(index, mssql.Int, updateObj[index]);
                sql += index + "=@" + index + ",";
            } else if (typeof updateObj[index] == "string") {
                request.input(index, mssql.NVarChar, updateObj[index]);
                sql += index + "=@" + index + ",";
            }
        }
    }
    sql = sql.substring(0, sql.length - 1) + " WHERE ";
    if (whereObj) {
        for (var index in whereObj) {
            if (typeof whereObj[index] == "number") {
                request.input(index, mssql.Int, whereObj[index]);
                sql += index + "=@" + index + " AND ";
            } else if (typeof whereObj[index] == "string") {
                request.input(index, mssql.NVarChar, whereObj[index]);
                sql += index + "=@" + index + " AND ";
            }
        }
    }
    sql = sql.substring(0, sql.length - 5);
    var result = await request.query(sql);
    await mssql.close();// close
    return result;
};

exports.query = querySql;
exports.update = update;
exports.add = add;
exports.addIfNotExist = addIfNotExist;
exports.addList = addList;

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