早上好
我是节点red和javascript的新手，所以这可能是一个简单的问题，即时通讯试图插入一个IP地址到MySQL表在mysql中，我将该字段设置为varchar（20）
9/28/2019，9:08:38 AMnode：7bfc4d89.726dbc
消息：错误
“错误：ER_PARSE_ERROR：您的SQL语法有错误；请查看与MySQL服务器版本相对应的手册，以找到在第1行的'[object Object]）'附近使用的正确语法”
基本流程如下：
[
{
"id": "df624ad9.0db0f8",
"type": "function",
"z": "661acf87.d0306",
"name": "Defining inside ip",
"func": "global.set(\"inside_ip\",msg.payload);\nreturn msg;",
"outputs": 1,
"noerr": 0,
"x": 530,
"y": 120,
"wires": [
[]
]
},
{
"id": "400e4f07.42965",
"type": "inject",
"z": "661acf87.d0306",
"name": "",
"topic": "",
"payload": "",
"payloadType": "date",
"repeat": "1",
"crontab": "",
"once": true,
"onceDelay": 0.1,
"x": 190,
"y": 120,
"wires": [
[
"f3f24f92.29582"
]
]
},
{
"id": "f3f24f92.29582",
"type": "ip",
"z": "661acf87.d0306",
"name": "ip",
"https": false,
"timeout": "5000",
"internalIPv4": true,
"internalIPv6": false,
"publicIPv4": false,
"publicIPv6": false,
"x": 330,
"y": 120,
"wires": [
[
"df624ad9.0db0f8"
]
]
},
{
"id": "47202c3d.71ebfc",
"type": "inject",
"z": "661acf87.d0306",
"name": "",
"topic": "",
"payload": "1",
"payloadType": "num",
"repeat": "1",
"crontab": "",
"once": true,
"onceDelay": "5",
"x": 230,
"y": 180,
"wires": [
[
"20c745e0.57fb2a"
]
]
},
{
"id": "7bfc4d89.726dbc",
"type": "mysql",
"z": "661acf87.d0306",
"mydb": "ca2479e3.1dda58",
"name": "",
"x": 510,
"y": 180,
"wires": [
[]
]
},
{
"id": "20c745e0.57fb2a",
"type": "function",
"z": "661acf87.d0306",
"name": "",
"func": "msg.topic =\"INSERT INTO`node`(`inside_ip`) VALUES(\" + global.get(\"inside_ip\") + \")\";\nreturn msg;\n",
"outputs": 1,
"noerr": 0,
"x": 350,
"y": 180,
"wires": [
[
"7bfc4d89.726dbc"
]
]
},
{
"id": "ca2479e3.1dda58",
"type": "MySQLdatabase",
"z": "",
"host": "72.90.182.40",
"port": "3306",
"db": "mysql_test",
"tz": "eastern"
}
]
但是如果我像这样设置“ ip”，它将起作用：
[
{
"id": "1f5e06b6.76e931",
"type": "function",
"z": "87908bbe.239128",
"name": "Defining inside ip",
"func": "global.set(\"inside_ip\",msg.payload);\nreturn msg;",
"outputs": 1,
"noerr": 0,
"x": 645,
"y": 228,
"wires": [
[]
]
},
{
"id": "4dd624b5.e58f34",
"type": "inject",
"z": "87908bbe.239128",
"name": "",
"topic": "",
"payload": "",
"payloadType": "date",
"repeat": "1",
"crontab": "",
"once": true,
"onceDelay": 0.1,
"x": 305,
"y": 228,
"wires": [
[
"b9528c26.ceca2"
]
]
},
{
"id": "b9528c26.ceca2",
"type": "ip",
"z": "87908bbe.239128",
"name": "ip",
"https": false,
"timeout": "5000",
"internalIPv4": true,
"internalIPv6": false,
"publicIPv4": false,
"publicIPv6": false,
"x": 445,
"y": 228,
"wires": [
[]
]
},
{
"id": "215d3000.15a8b8",
"type": "inject",
"z": "87908bbe.239128",
"name": "",
"topic": "",
"payload": "1",
"payloadType": "num",
"repeat": "1",
"crontab": "",
"once": true,
"onceDelay": "5",
"x": 345,
"y": 288,
"wires": [
[
"fdcd98f2.a35838"
]
]
},
{
"id": "17946cb4.862c23",
"type": "mysql",
"z": "87908bbe.239128",
"mydb": "59bd1ef5.938c2",
"name": "",
"x": 625,
"y": 288,
"wires": [
[]
]
},
{
"id": "fdcd98f2.a35838",
"type": "function",
"z": "87908bbe.239128",
"name": "",
"func": "msg.topic =\"INSERT INTO`node`(`inside_ip`) VALUES(\" + global.get(\"inside_ip\") + \")\";\nreturn msg;\n",
"outputs": 1,
"noerr": 0,
"x": 465,
"y": 288,
"wires": [
[
"17946cb4.862c23"
]
]
},
{
"id": "a248bafe.b02ac",
"type": "inject",
"z": "87908bbe.239128",
"name": "",
"topic": "",
"payload": "\"192.168.1.1\"",
"payloadType": "str",
"repeat": "",
"crontab": "",
"once": true,
"onceDelay": 0.1,
"x": 341,
"y": 145,
"wires": [
[
"1f5e06b6.76e931"
]
]
},
{
"id": "59bd1ef5.938c2",
"type": "MySQLdatabase",
"z": "",
"host": "72.90.182.40",
"port": "3306",
"db": "mysql_test",
"tz": "eastern"
}
]
任何建议都会很棒
问候迈克
好，所以您使用的IP节点在msg.payload中返回以下内容：>
{“ internalIPv4”：“ 192.168.1.107”}
为了能够将其保存到数据库中，您需要裁剪：
（{“ internalIPv4”：“和”}
有两种方法可以通过使用功能节点来做到这一点。
首先，一个是用任何内容替换不必要的字符串（这是我的方法！]
var str = JSON.stringify(msg.payload) var ip = str.replace('{"internalIPv4":"', ''); ip = ip.replace('"}', '') msg.payload = ip return msg;第二种方法是按字符数裁剪
var str = JSON.stringify(msg.payload) var ip = str.substring(17,30 ); msg.payload = ip return msg;此代码的问题是，如果IP的长度发生更改，则IP中的一个数字可能会丢失。
这两个函数都返回相同的消息（第一个在函数之前，第二个在函数之后]
{“ internalIPv4”：“ 192.168.1.107”}
“ 192.168.1.107”
关于您的小型项目的四个提示：1.无需每秒发送SQL查询。
最好使用一些唯一的标识符（如果在树莓派上运行，请使用其序列号来标识哪个IP用于哪个设备）]] >>
在MYSQL上为IP地址添加UNIQUE键
在哪里不能使用“，请使用'（尤其是在MySQL查询中拟合数据）
希望我帮忙！