Win10 + node.js から SQL Server 2019 Express に CSVファイルを書き込んでみる(tedious)

Win10 + node.js から SQL Server 2019 Express に CSVファイルを書き込んでみる
#目的
以下の環境で[郵便番号検索の](http://www.post.japanpost.jp/zipcode/)17ISHIKA.CSVを書き込んでみる
Win10 + node.js -> Ubuntu 18.04 + SQL Server 2019 Express
\#もう少し綺麗に書きたいなぁ・・・ 
#対象テーブル
データの並びは以下に準拠
<a href="http://www.post.japanpost.jp/zipcode/dl/readme.html">郵便番号データの説明</a>
対象データにユニークキーになりそうなデータが無いので
8桁のテキストを追加する

```sql
CREATE TABLE [dbo].[ZIPCODE](
	[SEQ] [nchar](8) NOT NULL,
	[PREFCODE] [nchar](3) NULL,
	[KUBUNCODE] [nchar](8) NULL,
	[POSTAL5] [nchar](5) NULL,
	[POSTAL] [nchar](8) NULL,
	[PREFKANA] [nchar](20) NULL,
	[CITYKANA] [nchar](40) NULL,
	[ADDRKANA] [nchar](80) NULL,
	[PREFKANJI] [nchar](20) NULL,
	[CITYKANJI] [nchar](40) NULL,
	[ADDRKANJI] [nchar](80) NULL,
	[FLG1] [int] NULL,
	[FLG2] [int] NULL,
	[FLG3] [int] NULL,
	[FLG4] [int] NULL,
	[FLG5] [int] NULL,
	[FLG6] [int] NULL
) ON [PRIMARY]
```
#サンプルコード
地元県だと名前感あるので 17ISHIKA.CSV を使う

```js

var async = require('async');
var Request = require('tedious').Request;
var TYPES = require('tedious').TYPES;
var Connection = require('tedious').Connection; 
var fs = require('fs');
var iconv = require('iconv-lite');
var csv = require('csv');

var connectionConfig = {
    userName: 'demo',
    password: 'demo',
    server: '192.168.5.49',
    options: {
        database: 'demo'
    }
};

var startTime = new Date();

iconv.skipDecodeWarning = true;

var strsql = "INSERT INTO ZIPCODE (";
strsql = strsql + "  SEQ";
strsql = strsql + ", PREFCODE";
strsql = strsql + ", KUBUNCODE";
strsql = strsql + ", POSTAL5"
strsql = strsql + ", POSTAL"
strsql = strsql + ", PREFKANA"
strsql = strsql + ", CITYKANA"
strsql = strsql + ", ADDRKANA"
strsql = strsql + ", PREFKANJI"
strsql = strsql + ", CITYKANJI"
strsql = strsql + ", ADDRKANJI"
strsql = strsql + ", FLG1"
strsql = strsql + ", FLG2"
strsql = strsql + ", FLG3"
strsql = strsql + ", FLG4"
strsql = strsql + ", FLG5"
strsql = strsql + ", FLG6"
strsql = strsql + ") VALUES (";
strsql = strsql + "  @SEQ";
strsql = strsql + ", @PREFCODE";
strsql = strsql + ", @KUBUNCODE";
strsql = strsql + ", @POSTAL5"
strsql = strsql + ", @POSTAL"
strsql = strsql + ", @PREFKANA"
strsql = strsql + ", @CITYKANA"
strsql = strsql + ", @ADDRKANA"
strsql = strsql + ", @PREFKANJI"
strsql = strsql + ", @CITYKANJI"
strsql = strsql + ", @ADDRKANJI"
strsql = strsql + ", @FLG1"
strsql = strsql + ", @FLG2"
strsql = strsql + ", @FLG3"
strsql = strsql + ", @FLG4"
strsql = strsql + ", @FLG5"
strsql = strsql + ", @FLG6"
strsql = strsql + ");";

var connection = new Connection(connectionConfig);
connection.on('connect', function(err) {  
    if (err) {
        console.log(err);
        console.log('err:connect');
        connection.exit;
        process.exit(0);
    }
    console.log("Connected");  
    truncatetable();
});

function truncatetable() {
    request = new Request("TRUNCATE TABLE ZIPCODE;", function(err) {
        if (err) {
            console.log(err);
            console.log('err:request:truncatetable');
            connection.exit;
            process.exit(0);
       }
    });

    request.on('requestCompleted', function (err) {
        console.log("requestCompleted:truncatetable");
        executeStatement();
    });
    connection.execSql(request);  
}

var numcnt = 0;
function executeStatement() {
    async.forEachSeries(fs.readFileSync('17ISHIKA.CSV', 'binary').toString().split('\n'), function(line, callback){
        if (line.length <= 0) {
            console.log('END:length <= 0');
            connection.exit;
            process.exit(0);
            return line;
        }
        line = iconv.decode(line, 'Shift_JIS');
        numcnt = numcnt + 1;
        csv.parse(line, function(err, line){
            csv.transform(line, function(line){
                return line;
            }, function(err, line){
                    request = new Request(strsql, function(err) {
                        if (err) {
                            console.log(err);
                            console.log('err:request');
                            connection.exit;
                            process.exit(0);
                        }
                        callback();
                    });

                    request.addParameter('SEQ',       TYPES.NVarChar, ('00000000' + numcnt).slice(-8));
                    request.addParameter('PREFCODE',  TYPES.NVarChar, line[0][0].substr(0, 2));
                    request.addParameter('KUBUNCODE', TYPES.NVarChar, line[0][0].trim());
                    request.addParameter('POSTAL5',   TYPES.NVarChar, line[0][1].trim());
                    request.addParameter('POSTAL',    TYPES.NVarChar, line[0][2].trim());
                    request.addParameter('PREFKANA',  TYPES.NVarChar, line[0][3].trim());
                    request.addParameter('CITYKANA',  TYPES.NVarChar, line[0][4].trim());
                    request.addParameter('ADDRKANA',  TYPES.NVarChar, line[0][5].trim());
                    request.addParameter('PREFKANJI', TYPES.NVarChar, line[0][6].trim());
                    request.addParameter('CITYKANJI', TYPES.NVarChar, line[0][7].trim());
                    request.addParameter('ADDRKANJI', TYPES.NVarChar, line[0][8].trim());
                    request.addParameter('FLG1',      TYPES.NVarChar, parseInt(line[0][9]));
                    request.addParameter('FLG2',      TYPES.NVarChar, parseInt(line[0][10]));
                    request.addParameter('FLG3',      TYPES.NVarChar, parseInt(line[0][11]));
                    request.addParameter('FLG4',      TYPES.NVarChar, parseInt(line[0][12]));
                    request.addParameter('FLG5',      TYPES.NVarChar, parseInt(line[0][13]));
                    request.addParameter('FLG6',      TYPES.NVarChar, parseInt(line[0][14]));
                    
                    connection.execSql(request);
                });
            });
    }, function(err){
        console.log('Err:OUT');
        connection.exit;
        process.exit(0);
    });
}
```
#参考にしたのは以下のサイト
[How to use object in Asyn forEachSeries](https://stackoverflow.com/questions/39915497/how-to-use-object-in-asyn-foreachseries)
[async.js forEach vs forEachSeries](https://gist.github.com/drewlesueur/997368)
[CSV Parser for Node.js](https://www.npmjs.com/package/csv-parse)
[csv](https://www.npmjs.com/package/csv)
[tediousjs/tedious-connection-pool](https://github.com/tediousjs/tedious-connection-pool)
[tedious-connection-pool](https://openbase.io/js/tedious-connection-pool)
[手順 1:Node.js 開発用に開発環境を構成する](https://docs.microsoft.com/ja-jp/sql/connect/node-js/step-1-configure-development-environment-for-node-js-development?view=sql-server-ver15)
[手順 3:Node.js を使用した SQL への接続を概念実証する](https://docs.microsoft.com/ja-jp/sql/connect/node-js/step-3-proof-of-concept-connecting-to-sql-using-node-js?view=sql-server-ver15)
[Requests can only be made in the LoggedIn state, not the SentClientRequest state (code: 'EINVALIDSTATE') \#458](https://github.com/tediousjs/tedious/issues/458)
[Requests can only be made in the LoggedIn state, not the SentClientRequest state](https://stackoverflow.com/questions/42525254/requests-can-only-be-made-in-the-loggedin-state-not-the-sentclientrequest-state)