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一、nodejs连接mysql？
npm install mysql --save
创建连接代码 db.js
//导入mysql连接包
const mysql = require('mysql');
let dbconfig ={
host: 'db_host',
user: 'db_user',
password: 'db_pass',
database: 'db_name',
debug: true
};
function handleDisconnection() {
db = mysql.createConnection(dbconfig);
db.connect(function (err) {
if (err) {
console.log('db connect error:' + err.message + "2秒后重连");
setTimeout(handleDisconnection, 2000);
}
});
db.on('error', function (err) {
console.log(err);
if (err.code === 'PROTOCOL_CONNECTION_LOST') {
console.log('db error执行重连:' + err.message);
handleDisconnection();
} else {
throw err;
}
});
db.querySync = function(sql) {
return new Promise(function(resolve, reject) {
db.query(sql, function(error, results, fields) {
if(error) reject(error);
else resolve({
results, fields})
})
})
};
return db;
}
//创建连接conn
exports.db = handleDisconnection();
二、Nodejs 连接 mysql时报错 Error: Cannot enqueue Query after fatal error
1.原配置参数
let dbconfig ={
host: 'db_host',
user: 'db_user',
password: 'db_pass',
database: 'db_name',
debug: true
};
只要加上useConnectionPooling: true参数就可以了
2.新配置参数
let dbconfig ={
host: 'db_host',
user: 'db_user',
password: 'db_pass',
database: 'db_name',
useConnectionPooling: true,
debug: true
};