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nodejs使用readline逐行读取和写入文件的实现

 更新时间：2024年01月30日 10:25:06   作者：雪域迷影  
这篇文章给大家介绍了nodejs使用readline逐行读取和写入文件的实现方法,文中通过代码示例给大家讲解的非常详细,对大家的学习或工作有一定的帮助,需要的朋友可以参考下
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需求描述

今天遇到一个小的需求，就是要根据Excel中的若干列数据生成多条SQL插入脚本，类似于下面input.txt文件这样：

2	24	0	1	1	a04005	.3
2	24	0	1	2	a04006	.3
2	24	0	1	3	a04007	.3
2	16	0	1	1	a99501	.3
2	16	0	1	2	a99502	.3
2	16	0	1	3	a99500	.3
2	16	0	1	4	a99505	.3
2	16	0	1	5	a99504	.3
2	16	0	1	6	a99503	.3
2	22	0	1	23	a24901	.3
2	22	0	1	27	a24904	.3
2	22	0	1	28	a24905	.3
2	22	0	1	29	a24042	.3
2	22	0	1	36	a25002	.3
2	22	0	1	33	a24036	.3
2	22	0	1	32	a24908	.3
2	22	0	1	34	a24909	.3
2	22	0	1	35	a24910	.3
2	22	0	1	37	a24012	.3
2	22	0	1	38	a24043	.3
2	22	0	1	39	a24084	.3
2	22	0	1	40	a24911	.3
2	22	0	1	43	a25003	.3
2	22	0	1	41	a24912	.3
2	22	0	1	42	a24913	.3
2	22	0	1	44	a24070	.3
2	22	0	1	45	a25004	.3
2	22	0	1	47	a25008	.3
2	22	0	1	49	a25038	.3
2	22	0	1	48	a25006	.3
2	22	0	1	46	a24044	.3
2	22	0	1	50	a25034	.3
2	22	0	1	51	a25033	.3
2	22	0	1	52	a25902	.3
2	22	0	1	53	a25014	.3
2	22	0	1	55	a25021	.3
2	22	0	1	56	a25901	.3
2	22	0	1	57	a25019	.3
2	22	0	1	54	a24068	.3
2	22	0	1	58	a25020	.3
2	22	0	1	59	a25903	.3
2	22	0	1	60	a25904	.3
2	22	0	1	61	a24914	.3
2	22	0	1	62	a24915	.3
2	22	0	1	1	a24001	.3
2	22	0	1	2	a24045	.3
2	22	0	1	3	a24002	.3
2	22	0	1	4	a24053	.3
2	22	0	1	5	a24038	.3
2	22	0	1	6	a24037	.3
2	22	0	1	7	a24079	.3
2	22	0	1	8	a24064	.3
2	22	0	1	11	a24063	.3
2	22	0	1	12	a24902	.3
2	22	0	1	13	a24041	.3
2	22	0	1	14	a24039	.3
2	22	0	1	20	a24077	.3
2	22	0	1	18	a24074	.3
2	22	0	1	22	a24076	.3
2	22	0	1	31	a24907	.3
2	22	0	1	24	a24903	.3
2	22	0	1	25	a24011	.3
2	22	0	1	21	a24061	.3
2	22	0	1	30	a24906	.3
2	22	0	1	104	a31005	.3
2	22	0	1	206	a24072	.3
2	22	0	1	221	a05009	.3
2	22	0	1	65	a05014	.3
2	22	0	1	66	a24099	.3
2	22	0	1	67	a24046	.3
2	22	0	1	15	a24078	.3
2	22	0	1	68	a24008	.3
2	22	0	1	69	a24015	.3
2	22	0	1	70	a24916	.3
2	22	0	1	96	a31004	.3
2	22	0	1	97	a31003	.3
2	22	0	1	72	a24047	.3
2	22	0	1	71	a05013	.3
2	22	0	1	98	a31024	.3
2	22	0	1	73	a24100	.3
2	22	0	1	74	a24003	.3
2	22	0	1	101	a28006	.3
2	22	0	1	75	a24016	.3
2	22	0	1	76	a24111	.3
2	22	0	1	77	a24004	.3
2	22	0	1	78	a24018	.3
2	22	0	1	79	a24005	.3
2	22	0	1	80	a24017	.3
2	22	0	1	81	a24049	.3
2	22	0	1	82	a24027	.3
2	22	0	1	83	a24007	.3
2	22	0	1	85	a24112	.3
2	22	0	1	84	a24054	.3
2	22	0	1	86	a24019	.3
2	22	0	1	87	a24050	.3
2	22	0	1	88	a24034	.3
2	22	0	1	89	a25010	.3
2	22	0	1	90	a24009	.3
2	22	0	1	91	a24020	.3
2	22	0	1	92	a25012	.3
2	22	0	1	95	a25011	.3
2	22	0	1	215	a30008	.3
2	22	0	1	219	a99051	.3
2	22	0	1	201	a29026	.3
2	22	0	1	208	a29017	.3
2	22	0	1	106	a31025	.3
2	22	0	1	209	a24110	.3
2	22	0	1	203	a25072	.3
2	22	0	1	222	a29015	.3
2	22	0	1	202	a31030	.3
2	22	0	1	211	a31027	.3
2	22	0	1	207	a24006	.3
2	22	0	1	93	a25013	.3
2	22	0	1	94	a25068	.3
2	22	0	1	204	a25015	.3
2	22	0	1	223	a24113	.3
2	22	0	1	224	a25059	.3
2	22	0	1	9	a24919	.3
2	22	0	1	213	a30003	.3
2	17	0	1	1	a99070	.0
2	17	0	1	2	a99071	.0
2	17	0	1	3	a99072	.0
2	17	0	1	4	a99073	.0
2	17	0	1	5	a99074	.0
2	17	0	1	6	a99075	.0
2	17	0	1	7	a99076	.0
2	17	0	1	8	a99077	.0
2	17	0	1	9	a99078	.0
2	17	0	1	10	a99079	.0
2	17	0	1	11	a99080	.0
2	17	0	1	12	a99081	.0
2	17	0	1	13	a99082	.0
2	17	0	1	14	a99083	.0
2	17	0	1	15	a99084	.0
2	17	0	1	16	a99085	.0
2	17	0	1	17	a99086	.0
2	17	0	1	18	a99087	.0
2	17	0	1	19	a99088	.0
2	17	0	1	20	a99089	.0
2	17	0	1	21	a99090	.0
2	17	0	1	22	a99091	.0
2	17	0	1	23	a99092	.0
2	17	0	1	24	a99093	.0
2	17	0	1	25	a99094	.0
2	17	0	1	26	a99095	.0
2	17	0	1	27	a99096	.0
2	17	0	1	28	a99097	.0
2	17	0	1	29	a99098	.0
2	17	0	1	30	a99099	.0
2	17	0	1	31	a99100	.0
2	17	0	1	32	a99101	.0
2	17	0	1	35	a99102	.1
2	17	0	1	36	a99103	.1
2	17	0	1	37	a99104	.1

每行数据格式都是一样的，分别代表protocol, slave, number, ptype, pid,name, format，每个字段以’\t’制表符为分隔符。

上面的input.txt是我从Excel中粘贴复制过来的，本想复制到Editplus进行处理，然后生成类似于每行

INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 24, 0, 1, 1, 'a04005', '.3');

这样的SQL插入脚本。

方法一

相关Nodejs代码 app.js

直接用C++也可以写，对于nodejs读写文件不是很熟练，于是上网找资料，需要使用nodejs内置的fs和readline 库实现文件的读取和写入。得到下面的解决方案：

// app.js
var fs = require('fs');
var readline = require('readline');
var os = require('os'); 

// Node.js readline 逐行读取、写入文件内容的示例
// /article/135706.htm
// nodejs读取文件、按行读取
// https://blog.csdn.net/weixin_42171955/article/details/100156212

var strInputFileName = './input.txt';
var strOutputFileName = 'output.txt';

var fRead = fs.createReadStream(strInputFileName); 
var fWrite = fs.createWriteStream(strOutputFileName); 
  
fRead.on('end', ()=>{ 
 console.log('end'); 
}); 
  
var objReadline = readline.createInterface({ 
 input: fRead, 
 output: fWrite, 
 terminal: false
}); 

objReadline.on('line', (strLine)=>{ 
 // 获取某一行的数据，数据以\t分割，例如：24	0	1	1	a04005	.2
 var strArr = strLine.split('\t');
 let protocol = strArr[0];
 let slave = strArr[1];
 let number = strArr[2];
 let ptype = strArr[3];
 let pid = strArr[4];
 let name = strArr[5];
 let format = strArr[6];

// 由于readline::output是先写入后调用的on('line')事件， 
// 所以已经读取文件完毕时就不需要再写行号了... 
// INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
// VALUES (2, 29, 0, 1, 2, 'a06011', '.3');
let strTemp = `INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)\n `;
strTemp += `VALUES(${protocol}, ${slave}, ${number}, ${ptype}, ${pid}, '${name}', '${format}');\n`;
fWrite.write(strTemp); 
}); 
 
 
objReadline.on('close', ()=>{ 
 console.log('readline close...'); 
});

运行代码 node app.js

vscode_run

在当前项目目录下得到output.txt文件如下：

INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 24, 0, 1, 1, 'a04005', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 24, 0, 1, 2, 'a04006', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 24, 0, 1, 3, 'a04007', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 16, 0, 1, 1, 'a99501', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 16, 0, 1, 2, 'a99502', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 16, 0, 1, 3, 'a99500', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 16, 0, 1, 4, 'a99505', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 16, 0, 1, 5, 'a99504', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 16, 0, 1, 6, 'a99503', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 22, 0, 1, 23, 'a24901', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 22, 0, 1, 27, 'a24904', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 22, 0, 1, 28, 'a24905', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 22, 0, 1, 29, 'a24042', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 22, 0, 1, 36, 'a25002', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 22, 0, 1, 33, 'a24036', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 22, 0, 1, 32, 'a24908', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 22, 0, 1, 34, 'a24909', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 22, 0, 1, 35, 'a24910', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 22, 0, 1, 37, 'a24012', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 22, 0, 1, 38, 'a24043', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 22, 0, 1, 39, 'a24084', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 22, 0, 1, 40, 'a24911', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 22, 0, 1, 43, 'a25003', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 22, 0, 1, 41, 'a24912', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 22, 0, 1, 42, 'a24913', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 22, 0, 1, 44, 'a24070', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 22, 0, 1, 45, 'a25004', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 22, 0, 1, 47, 'a25008', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 22, 0, 1, 49, 'a25038', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 22, 0, 1, 48, 'a25006', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 22, 0, 1, 46, 'a24044', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 22, 0, 1, 50, 'a25034', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 22, 0, 1, 51, 'a25033', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 22, 0, 1, 52, 'a25902', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 22, 0, 1, 53, 'a25014', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 22, 0, 1, 55, 'a25021', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 22, 0, 1, 56, 'a25901', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 22, 0, 1, 57, 'a25019', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 22, 0, 1, 54, 'a24068', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 22, 0, 1, 58, 'a25020', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 22, 0, 1, 59, 'a25903', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 22, 0, 1, 60, 'a25904', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 22, 0, 1, 61, 'a24914', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 22, 0, 1, 62, 'a24915', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 22, 0, 1, 1, 'a24001', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 22, 0, 1, 2, 'a24045', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 22, 0, 1, 3, 'a24002', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 22, 0, 1, 4, 'a24053', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 22, 0, 1, 5, 'a24038', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 22, 0, 1, 6, 'a24037', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 22, 0, 1, 7, 'a24079', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 22, 0, 1, 8, 'a24064', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 22, 0, 1, 11, 'a24063', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 22, 0, 1, 12, 'a24902', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 22, 0, 1, 13, 'a24041', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 22, 0, 1, 14, 'a24039', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 22, 0, 1, 20, 'a24077', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 22, 0, 1, 18, 'a24074', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 22, 0, 1, 22, 'a24076', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 22, 0, 1, 31, 'a24907', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 22, 0, 1, 24, 'a24903', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 22, 0, 1, 25, 'a24011', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 22, 0, 1, 21, 'a24061', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 22, 0, 1, 30, 'a24906', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 22, 0, 1, 104, 'a31005', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 22, 0, 1, 206, 'a24072', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 22, 0, 1, 221, 'a05009', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 22, 0, 1, 65, 'a05014', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 22, 0, 1, 66, 'a24099', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 22, 0, 1, 67, 'a24046', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 22, 0, 1, 15, 'a24078', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 22, 0, 1, 68, 'a24008', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 22, 0, 1, 69, 'a24015', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 22, 0, 1, 70, 'a24916', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 22, 0, 1, 96, 'a31004', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 22, 0, 1, 97, 'a31003', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 22, 0, 1, 72, 'a24047', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 22, 0, 1, 71, 'a05013', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 22, 0, 1, 98, 'a31024', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 22, 0, 1, 73, 'a24100', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 22, 0, 1, 74, 'a24003', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 22, 0, 1, 101, 'a28006', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 22, 0, 1, 75, 'a24016', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 22, 0, 1, 76, 'a24111', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 22, 0, 1, 77, 'a24004', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 22, 0, 1, 78, 'a24018', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 22, 0, 1, 79, 'a24005', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 22, 0, 1, 80, 'a24017', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 22, 0, 1, 81, 'a24049', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 22, 0, 1, 82, 'a24027', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 22, 0, 1, 83, 'a24007', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 22, 0, 1, 85, 'a24112', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 22, 0, 1, 84, 'a24054', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 22, 0, 1, 86, 'a24019', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 22, 0, 1, 87, 'a24050', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 22, 0, 1, 88, 'a24034', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 22, 0, 1, 89, 'a25010', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 22, 0, 1, 90, 'a24009', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 22, 0, 1, 91, 'a24020', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 22, 0, 1, 92, 'a25012', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 22, 0, 1, 95, 'a25011', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 22, 0, 1, 215, 'a30008', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 22, 0, 1, 219, 'a99051', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 22, 0, 1, 201, 'a29026', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 22, 0, 1, 208, 'a29017', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 22, 0, 1, 106, 'a31025', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 22, 0, 1, 209, 'a24110', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 22, 0, 1, 203, 'a25072', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 22, 0, 1, 222, 'a29015', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 22, 0, 1, 202, 'a31030', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 22, 0, 1, 211, 'a31027', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 22, 0, 1, 207, 'a24006', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 22, 0, 1, 93, 'a25013', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 22, 0, 1, 94, 'a25068', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 22, 0, 1, 204, 'a25015', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 22, 0, 1, 223, 'a24113', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 22, 0, 1, 224, 'a25059', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 22, 0, 1, 9, 'a24919', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 22, 0, 1, 213, 'a30003', '.3');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 17, 0, 1, 1, 'a99070', '.0');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 17, 0, 1, 2, 'a99071', '.0');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 17, 0, 1, 3, 'a99072', '.0');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 17, 0, 1, 4, 'a99073', '.0');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 17, 0, 1, 5, 'a99074', '.0');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 17, 0, 1, 6, 'a99075', '.0');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 17, 0, 1, 7, 'a99076', '.0');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 17, 0, 1, 8, 'a99077', '.0');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 17, 0, 1, 9, 'a99078', '.0');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 17, 0, 1, 10, 'a99079', '.0');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 17, 0, 1, 11, 'a99080', '.0');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 17, 0, 1, 12, 'a99081', '.0');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 17, 0, 1, 13, 'a99082', '.0');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 17, 0, 1, 14, 'a99083', '.0');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 17, 0, 1, 15, 'a99084', '.0');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 17, 0, 1, 16, 'a99085', '.0');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 17, 0, 1, 17, 'a99086', '.0');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 17, 0, 1, 18, 'a99087', '.0');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 17, 0, 1, 19, 'a99088', '.0');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 17, 0, 1, 20, 'a99089', '.0');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 17, 0, 1, 21, 'a99090', '.0');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 17, 0, 1, 22, 'a99091', '.0');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 17, 0, 1, 23, 'a99092', '.0');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 17, 0, 1, 24, 'a99093', '.0');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 17, 0, 1, 25, 'a99094', '.0');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 17, 0, 1, 26, 'a99095', '.0');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 17, 0, 1, 27, 'a99096', '.0');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 17, 0, 1, 28, 'a99097', '.0');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 17, 0, 1, 29, 'a99098', '.0');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 17, 0, 1, 30, 'a99099', '.0');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 17, 0, 1, 31, 'a99100', '.0');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 17, 0, 1, 32, 'a99101', '.0');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 17, 0, 1, 35, 'a99102', '.1');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 17, 0, 1, 36, 'a99103', '.1');
INSERT INTO tb_param(protocol, slave, number, ptype, pid, name, format)
 VALUES(2, 17, 0, 1, 37, 'a99104', '.1');

这样就根据input.txt文件，逐行读取并根据字段生成所需要的SQL插入脚本，然后再相应的数据库中执行就OK了。

方法二

1.实现代码

var fs = require('fs');
var readline = require('readline');

/*
* 按行读取文件内容
* 返回：字符串数组
* 参数：fReadName:文件名路径
*      callback:回调函数
* */
function readFileToArr(fReadName,callback){
    var fRead = fs.createReadStream(fReadName);
    var objReadline = readline.createInterface({
        input:fRead
    });
    var arr = new Array();
    objReadline.on('line',function (line) {
        arr.push(line);
        //console.log('line:'+ line);
    });
    objReadline.on('close',function () {
       // console.log(arr);
        callback(arr);
    });
}

2.测试例子

<1.文本文件

<2.测试程序

<3.结果

总结

到此这篇关于nodejs使用readline逐行读取和写入文件的实现的文章就介绍到这了,更多相关nodejs readline逐行读取和写入文件内容请搜索程序员之家以前的文章或继续浏览下面的相关文章希望大家以后多多支持程序员之家！

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