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db.js
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db.js
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const mysql = require('mysql');
const pool = mysql.createPool({
connectionLimit: 10,
host: 'localhost',
user: '',
password: '',
database: 'retique',
dateStrings : true
});
function queryRoombyAbbr(abbr){
return new Promise((resolve, reject) => {
pool.query('SELECT * FROM rooms WHERE abbr = ? ;', abbr,(err, rows, fields) => {
if (err) reject(err);
else resolve(rows);
});
});
}
function queryQuestionListbyRoomID(roomid){
return new Promise((resolve, reject) => {
pool.query('SELECT * FROM questions WHERE roomid = ? ;', roomid,(err, rows, fields) => {
if (err) reject(err);
else resolve(rows);
});
});
}
function insertQuestiontoRoom(question, author, replyid, roomid){
return new Promise((resolve, reject) => {
pool.query("INSERT INTO `questions` SET ?;", { roomid: roomid, content: question, author: author, replyid: replyid },(err, result) => {
if(err) reject(err)
else resolve(result)
});
});
}
function updateQuestionLike(questionid, isAdd){
return new Promise((resolve, reject) => {
if(isAdd){
pool.query("UPDATE questions SET `like` = `like` + 1 WHERE id = ?", questionid,(err, result) => {
if(err) reject(err)
else resolve(result)
});
}else{
pool.query("UPDATE questions SET `like` = GREATEST(`like`-1, 0) WHERE id = ?", questionid,(err, result) => {
if(err) reject(err)
else resolve(result)
});
}
});
}
function createRoom(name, abbr, pwd){
return new Promise((resolve, reject) => {
pool.query("INSERT INTO `rooms` SET ?;", { name: name, abbr: abbr, password: pwd },(err, result) => {
if(err) reject(err)
else resolve(result)
});
});
}
function getRoomPassword(roomid){
return new Promise((resolve, reject) => {
pool.query('SELECT * FROM rooms WHERE id = ? ;', roomid,(err, rows, fields) => {
if (err) reject(err);
else resolve(rows);
});
});
}
function deleteQuestionByID(QuestionID, roomList){
return new Promise((resolve, reject) => {
if(roomList.length == 0){
reject();
return ;
}
pool.query('DELETE FROM `questions` WHERE (`id` = ? OR `replyid` = ? ) AND roomid IN ('+ roomList.join(",") +') ;', [QuestionID, QuestionID],(err, rows, fields) => {
if (err) reject(err);
else resolve(rows);
});
});
}
module.exports = { queryRoombyAbbr, queryQuestionListbyRoomID, insertQuestiontoRoom, updateQuestionLike, createRoom, getRoomPassword, deleteQuestionByID }