I currently have a database of people with each individual person and they hold a status value. I am trying to change their status value.
const id = parseInt(req.params.id , 10);
const { valid, messageObj } = validateId(id);
if (!valid) {
res.status(400).send(messageObj);
}
let { status, priority } = req.body;
let people = db.prepare('select * from people').all();
const person = people.find(person => person.id === id);
if(status !== 'none' & status == 'ready' || status == 'done'){
let updates = db.query(
'UPDATE people SET ? WHERE ?',
[{ status: status }, { id: id }]
);
}
I keep getting an error of db.query is not a function but I get that for every function that I try.
Pretty new to SQL but just trying to figure this out or any documentation that will help me as the better-sqlite3 doesn't have any update functions in the official documentation.
I cannot find a function called query() in the better-sqlite3 API for the Database class. I think that you would need to prepare() a Statement object, then run() it.
Also, column names cannot be passed as bound parameters. Your query should look like:
UPDATE people SET status = ? WHERE name = ?
You would need to change this:
let updates =
db.query('UPDATE people SET ? WHERE ?', [{ status: status }, { id: id }]);
To:
const stmt = db.prepare('UPDATE people SET status = ? WHERE id = ?');
const updates = stmt.run(status, id);
According to templates you can use javascript syntax to replace variables to its value.
let updates = db.exec(`UPDATE people SET status='${status}' WHERE id='${id}'`);
Related
I have the below method that aims to filter records from a table. But sometimes, the user might only select one filter or two. I want to add where conditions only for parameters that the user sends. At the moment, it filters with all conditions. One possibility I know is to use some conditions to concatenate the string if true but I do not think this is the best way.
Any better way of doing this?
// Retrieve hotels by filter
app.get('/filter', (request, response) => {
var name = request.query.name;
var country = request.query.country;
var freeWifi = request.query.freeWifi;
var freeParking = request.query.freeParking;
var restaurant = request.query.restaurant;
var pool = request.query.pool;
var gym = request.query.gym;
var airconditioning = request.query.airconditioning;
let query = `select * from hotels h inner join hotelFilters hf on h.id = hf.hotelId where h.title like "%${isNullOrUndefined(name) ? '' : name}%"
and hf.freeWifi = ${freeWifi} and hf.freeParking = ${freeParking} and hf.restaurant = ${restaurant} and hf.outdoorPool = ${pool}
and hf.airConditioning = ${airconditioning}
and hf.gym = ${gym}`;
connection.query(query, (error, result) => {
if (error) {
console.log(error, 'Error occurred with hotels/filter API...');
}
if (result.length > 0) {
response.send({
result
})
}
})
});
I use react native through firebase database
I have a database creating products each product has a number
I want to take a number and compare it with the product number
And if there is then I want to get a product
the function its give me my correct name but where i use it on render its not found the variable (name)
getAllContact = async key => {
let barCodeData2 = this.props.navigation.state.params.barcodeData
let self = this;
let contactRef = firebase.database().ref()
contactRef.on("value", dataSnapsot => {
if (dataSnapsot.val()) {
let contactResult = Object.values(dataSnapsot.val())
let contactKey = Object.keys(dataSnapsot.val())
contactKey.forEach((value, key) => {
contactResult[key]["key"] = value
})
self.setState({
fname: contactResult.fname,
data: contactResult.sort((a, b) => {
var nameA = a.barcode
var nameB = barCodeData2
const name = a.fname
console.log(`${nameA} What numers issssssss`);
if (nameA == nameB) {
alert(`${name} ........`)
console.log(`${nameA == nameB}is Equqlqlqlql`);
return name
}
}),
})
}
})
}
render() {
let t=this.state.name
alert(`${t} how?`)// is give Not found
// let d = this.props.navigation.state.params.barcodeData
return (
)
}
When you try such a comparison query i.e.
let ref = firebase.firestore();
ref.collection('zoo')
.where("id", "==", myID)
.get()
.then((snapshot) => {
console.log(snap.empty); //this will denote if results are empty
snapshot.forEach(snap => {
console.log(snap.exists); //alternatively this will also tell you if it is empty
})
})
well what you can do is run query based on you product no and if there's a product you will a product if there's none you will get an empty array.
read firebase documentation on queries
https://firebase.google.com/docs/reference/js/firebase.database.Query
I created subject like that
const subject = new Subject({
subject_name
});
subject.save();
and then I created Teacher
const teacher = new Teacher({
teacher_name:'teacher neme',
teacher_age:34,
subject:'wGvTu03HQd'
});
teacher.save();
when i try to get the teacher object using
let query = new Parse.Query(Teacher);
let a = await query.get(objectId);
console.log(a.get('subject'))
i get
ParseObjectSubclass { className: 'Subject', _objCount: 1, id: '8sB8uibifQ' }
is there is a way to get the data from the subject object without using
let query = new Parse.Query(Subject);
let a = await query.get(objectId);
since it has a relation with the Teacher, something like populate in mongoose?
Yes. You can use the include function:
let query = new Parse.Query(Teacher);
query.include('subject');
let a = await query.get(objectId);
console.log(a.get('subject'))
Reference: https://docs.parseplatform.org/js/guide/#relational-queries
I'm trying to get information (true/false) from AsyncStorage in a function and create a string which is importent to fetch data in the next step. My problem is, the function is not finished until the string is required.
I tried many solutions from the internet like async function and await getItem or .done() or .then(), but none worked out for me.
//_getFetchData()
AsyncStorage.getAllKeys().then((result) => { //get all stored Keys
valuelength = result.length;
if (valuelength !== 0) {
for (let i = 0; i < valuelength; i++) {
if (result[i].includes("not") == false) { //get Keys without not
AsyncStorage.getItem(result[i]).then((resultvalue) => {
if (resultvalue === 'true') {
if (this.state.firstValue) {
this.state.channels = this.state.channels + "channel_id" + result[i];
console.log("channel: " + this.state.channels);
}
else {
this.state.channels = this.state.channels + "channel" + result[i];
}
}
});
}
return this.state.channels;
_fetchData() {
var channel = this._getFetchData();
console.log("channel required: " + channel);
}
The current behaviour is that the console displays first "channel required: " than "channel: channel_id0".
Aspects in your question are unclear:
You don't say when this.state.firstValue is set, and how that relates to what you are trying to accomplish.
You have a for-loop where you could be setting the same value multiple times.
You mutate the state rather than set it. This is not good, see this SO question for more on that.
There are somethings we can do to make your code easier to understand. Below I will show a possible refactor. Explaining what I am doing at each step. I am using async/await because it can lead to much tidier and easier to read code, rather than using promises where you can get lost in callbacks.
Get all the keys from AsyncStorage
Make sure that there is a value for all the keys.
Filter the keys so that we only include the ones that do not contain the string 'not'.
Use a Promise.all, this part is important as it basically gets all the values for each of the keys that we just found and puts them into an array called items
Each object in the items array has a key and a value property.
We then filter the items so that only the ones with a item.value === 'true' remain.
We then filter the items so that only the ones with a item.value !== 'true' remain. (this may be optional it is really dependent on what you want to do)
What do we return? You need to add that part.
Here is the refactor:
_getFetchData = async () => {
let allKeys = await AsyncStorage.getAllKeys(); // 1
if (allKeys.length) { // 2
let filteredKeys = allKeys.filter(key => !key.includes('not')); // 3
let items = await Promise.all(filteredKeys.map(async key => { // 4
let value = await AsyncStorage.getItem(key);
return { key, value }; // 5
}))
let filteredTrueItems = items.filter(item => items.value === 'true'); // 6
let filteredFalseItems = items.filter(item => items.value !== 'true'); // 7
// now you have two arrays one with the items that have the true values
// and one with the items that have the false values
// at this points you can decide what to return as it is not
// that clear from your question
// return the value that your want // 8
} else {
// return your default value if there are no keys // 8
}
}
You would call this function as follows:
_fetchData = async () => {
let channel = await this._getFetchData();
console.log("channel required: " + channel);
}
Although the above will work, it will not currently return a value as you haven't made it clear which value you wish to return. I would suggest you build upon the code that I have written here and update it so that it returns the values that you want.
Further reading
For further reading I would suggest these awesome articles by Michael Chan that discuss state
https://medium.learnreact.com/setstate-is-asynchronous-52ead919a3f0
https://medium.learnreact.com/setstate-takes-a-callback-1f71ad5d2296
https://medium.learnreact.com/setstate-takes-a-function-56eb940f84b6
I would also suggest taking some time to read up about async/await and promises
https://medium.com/#bluepnume/learn-about-promises-before-you-start-using-async-await-eb148164a9c8
And finally this article and SO question on Promise.all are quite good
https://www.taniarascia.com/promise-all-with-async-await/
Using async/await with a forEach loop
Try this instead. Async functions and Promises can be tricky to get right and can be difficult to debug but you're on the right track.
async _getFetchData() {
let channels = "";
let results = await AsyncStorage.getAllKeys();
results.forEach((result) => {
if (result.includes("not") === false) {
let item = await AsyncStorage.getItem(result);
if (item === 'true') {
console.log(`channel: ${result}`)
channels = `channel_id ${result}`;
}
}
});
return channels;
}
_fetchData() {
this._getFetchData().then((channels) => {
console.log(`channel required: ${channel}`);
});
}
what if you wrap the _getFetchData() in a Promise? This would enable you to use
var channel = this._getFetchData().then(console.log("channel required: " + channel));
Otherwise the console.log won't wait for the execution of the _getFetchData().
This is what the console.log is telling you. it just logs the string. the variable is added after the async operation is done.
UPDATE
I would try this:
//_getFetchData()
AsyncStorage.getAllKeys().then((result) => { //get all stored Keys
valuelength = result.length;
if (valuelength !== 0) {
for (let i = 0; i < valuelength; i++) {
if (result[i].includes("not") == false) { //get Keys without not
AsyncStorage.getItem(result[i]).then((resultvalue) => {
if (resultvalue === 'true') {
if (this.state.firstValue) {
this.state.channels = this.state.channels + "channel_id" + result[i];
console.log("channel: " + this.state.channels);
}
else {
this.state.channels = this.state.channels + "channel" + result[i];
}
}
});
}
return new Promise((resolve, reject) => {
this.state.channels !=== undefined ? resolve(this.state.channels) : reject(Error('error '));
}
_fetchData() {
var channel = this._getFetchData().then(console.log("channel required: " + channel));
}
maybe you must change the this.state.channels !=== undefined to an expression that's matches the default value of this.state.channels.
I have employee in one sheet and I get row id of the searched employee on the page now I want to update the same record with the row id so that my time of searching the employee is saved. Is there any way to do this?
function getEmployeeName_(){
try{
var username = getUserName_();
var formObject = {verb:'GET',url:'/Employees?Emp_Email='+g_obj.current_user_email};
var response_obj = processForm(formObject);
response_obj = JSON.parse(response_obj);
var userObj = {};
if(response_obj != undefined && response_obj.status != undefined && response_obj.status == 'success'){
if(response_obj['data'].length >0){
userObj = response_obj['data'][0];
}
}
return userObj.Emp_Name;
}catch(e){
Logger.log(e.message);
return { status: 'error', message: 'Something went wrong while fetching User Name.'};
}
}
To update values in Sheets API, use spreadsheets.values.update. The rowId you're talking about will be a part of range property using A1Notation.
To check samples on using sheets values.update, check Sheet Operations.