查询资料才发现:Node Redis版本V4之后,连接语法变了。
Starting from v4 of node-redis library, you need to call client.connect() after initializing a client. See this migration guide.
新语法:
const redis = require('redis')
const client = redis.createClient({ socket: { port: 6379 } })
client.connect()
client.on('connect', () =>{
console.log('connected')
})
You might also want to consider running the client connect method with await in an asynchronous function. So you don't have to worry about event listeners.
const redis = require('redis')
(async () =>{
try {
const client = redis.createClient({ socket: { port: 6379 } })
await client.connect()
console.log('connected')
} catch (err) {
console.error(err)
}
})()
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
[Example]:
const redis = require("redis")
(async () =>{
try {
const client = redis.createClient({
socket: { port: 6379 },
legacyMode: true,
})
await client.connect()
console.log("connected")
await client.v4.set("key4", "value2", {
NX: true,
})
client.set("key3", "value3", "NX", (err, reply) =>{})
await client.get("key4", function (err, v) {
console.log("redis get hello err,v", err, v)
})
client.set("student1", "Laylaa1", function (err, reply) {
if (err) {
console.log(err)
callback(err, null)
return
}
console.log(reply)
})
} catch (err) {
console.error(err)
}
})()
本文实例讲述了nodejs简单访问及操作mysql数据库的方法。分享给大家供大家参考,具体如下:var
mysql
=
require('mysql')
//调用MySQL模块
mysql模块要安装
$
npm
install
mysql
//创建一个connection
var
connection
=
mysql.createConnection({
host
:
'127.0.0.1',
//主机
user
:
'root',
//MySQL认证用户名
password
:
'',
//MySQL认证用户密码
port:
'3306',
//端口号
database:''
//数据库名
})
//创建一个connection
connection.connect(function(err){
if(err){
console.log('[query]
-
:'+err)
return
}
console.log('[connection
connect]
succeed!')
})
//执行SQL语句
connection.query('SELECT
1
+
1
AS
solution',
function(err,
rows,
fields)
{
if
(err)
{
console.log('[query]
-
:'+err)
return
}
console.log('The
solution
is:
',
rows[0].solution)
})
//关闭connection
connection.end(function(err){
if(err){
return
}
console.log('[connection
end]
succeed!')
})
注:nodejs在操作数据库的时候不用设置数据库的编码格式
set
names
utf8
希望本文所述对大家nodejs程序设计有所帮助。
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