我正在使用 npm mysql 包,使用 dbHandler.js
:
创建到我的mysql 数据库的连接池
var mysql = require("mysql");
var pool = mysql.createPool({
connectionLimit : 10,
host: "path.to.host",
user: "username",
password: "password",
database: "dbname",
debug: false
});
exports.pool = pool;
然后我在内部调用它
routesHandler.js
,来处理我的SQL请求:
var mysql = require("mysql");
var pool = require("./dbHandler");
exports.login = function(req, res) {
var email = req.body.email;
pool.query('SELECT * FROM users WHERE users.email = ?', [email], function(
error,
results,
fields
) {
if (error) {
res.send({
code: 400,
failed: "Error ocurred"
});
} else {
if (results.length > 0) {
//Mail authorized
res.send({
code: 200,
success: "Sucessfull login"
});
} else {
//Mail unauthorized
res.send({
code: 403,
failed: "Unauthorized mail"
});
}
}
});
};
我不确定这是最好的方法,但我似乎找不到合适的例子......:/
我很乐意:)接受有关处理整个过程的任何建议或链接:
但是我收到了基本的错误消息,但我不知道如何摆脱它:
类型错误:pool.query 不是函数
欢迎任何指点!
你这样做了
exports.pool = pool;
,所以你必须像这样称呼泳池专有var pool = require("./dbHandler");
。
如果您在
module.exports=pool
中使用 dbHandler
那么您的代码将按原样工作。
如果不直接使用我的答案:
var pool = require("./dbHandler").pool;
exports.login = function(req, res) {
var email = req.body.email;
pool.query('SELECT * FROM users WHERE users.email = ?', [email], function(
error,
results,
fields
) {
if (error) {
res.send({
code: 400,
failed: "Error ocurred"
});
} else {
if (results.length > 0) {
//Mail authorized
res.send({
code: 200,
success: "Sucessfull login"
});
} else {
//Mail unauthorized
res.send({
code: 403,
failed: "Unauthorized mail"
});
}
}
});
};
我遇到了类似的问题,我尝试了大多数可用的解决方案,但没有一个能正常工作,最后,我得到了问题的答案。
dbHandler.js
文件:
var Pool = require('pg').Pool;
var pool = new Pool({
user: 'postgres',
host: 'localhost',
database: 'database_name',
password: '#############',
port: 5432,
});
module.exports = {pool};
anotherfile.js
:
let {pool: pool} = require('dbHandler');
// by this calling method I was able to use pool
我认为你必须在这样的函数之前使用
async/await
:
exports.login = async function(req, res) {
var email = req.body.email;
await pool.query('SELECT * FROM users WHERE users.email = ?', [email], function(
error,
results,
fields
) {
if (error) {
res.send({
code: 400,
failed: "Error ocurred"
});
} else {
if (results.length > 0) {
//Mail authorized
res.send({
code: 200,
success: "Sucessfull login"
});
} else {
//Mail unauthorized
res.send({
code: 403,
failed: "Unauthorized mail"
});
}
}
});
};
你基本上必须从池中创建一个客户端,调用类似这样的 const { client } = pool();等待 pool.query('SELECT * FROM users WHERE users.email = ?', [email], function( 错误, 结果, 领域 ){ 如果(错误){ 发送({ 代码:400, 失败:“发生错误” }); } 别的 { if (结果.长度 > 0) { //邮件授权 发送({ 代码:200, success: “登录成功” }); } 别的 { //邮件未授权 发送({ 代码:403, 失败:“未经授权的邮件” }); } } }); };