I'm trying to connect my NestJs Project with a Oracle db and I'm using TypeORM and the status of connection is ok but I don't know how I can connect with a function. This function is into of a package and at the same time this package is into of a schema. The structure is like:
mySchema:
--------->myPackage:
-------------------->myFunction(id)
In the NestJS code I'm define this import in the AppModule file:
When I try to use the entity I don't know what method can I use to connect with my function. With the ESLint I get the next methods:
I hope to be clear and thanks for all!
In you last picture you’re trying to make a request to the database and as you can see, when you mentioned the testRepository and dots(.) now you have to tell him what you want to do in your database and in the suggested list you have all the possible possibilities.
So if you want to get or fetch data from you database, you will use testRepository.find() this will give you everything in that particular entity. To do that, you have to do something like below, before that you code has something that I have never seen in Nest, (public); if it does exist but I won’t use that in my Example since I don’t know it in Nest and also; you have started writing without (return) I don’t know how you’re expecting to return what you will get from your database.
Here is my example:
in your controller:
#Get() AnyThing(): Promise<TestEntity[]> {return this.DaobscsService.whatEver(); }
And in your service:
#InjectRepository(TestEntity) private readonlytestRepository: Repository<TestEntity>, ) {}
async whatEver(): Promise<TestEntity[]> {return await this.testRepository.find();}
What ever name you gonna use instead (whatEver()) in the service that have used, remember to use the same name in your controller pointing to service (this.Boa...Service.(The name here) OOP system’s you know it I hope
This example is to get or fetch so if you don’t have any thing in your database then you will get nothing! if that’s not what u want then command with a full version of what exactly is your issue, what u expected and code from controller, service, and module.
Related
I am using Mongoose 5+ and currently do not have the option of upgrading to Mongoose 6 (which seems to have fixed several issues concerning types and stuff)
I am refactoring from js to ts, and I keep hitting a wall when dealing with pre hooks. In this particular case, I want to understand how to pass generic types to the pre hook and not have typescript get mad that i am trying to access certain fields of this
So my prehook looks like this. It is using findOneAndUpdate and in this case the this is bound to the Query, which gives me some particular properties to access, such as this._update and this._conditions. I use this._update to access the information I am trying to update in this document, and I use that to modify another document in another collection before committing to the change in this document. I use this so the operation will be atomic and no changes will be committed to the DB if any of the other writes fails. However, typescript does not like me accessing values from this and outlined below are the errors i get
unitsSchema.pre('findOneAndUpdate', async function(next){
const update = this._update; //TSError: Property '_update' does not exist on type 'Query<any, any>'
const conditions = this._conditions; //Property '_conditions' does not exist on type 'Query<any, any>'
if(update.isDeleted === true){
//remove the unit from the condo model
await Condos.updateOne({_id:conditions.condoID},
{$pull:{
units:conditions._id
}}).catch(e=>next(e));
await UnitSttmt.updateMany({unitID:conditions._id},
{isDeleted:true})
.catch(e=>next(e));
}
//I even get an error here for some reason, i dont understand why here next is expecting a required argument, but not on other similar hooks
next(); // Expected 1 arguments, but got 0
}
I have tried passing it my document interface which extends mongoose.Document type and some other types too, but to no avail. Does anyone have any insight on how to get typescript to recognize the available Query paramters that exist?
Some examples I have tried
unitsSchema.pre<Query<any, UnitsDocument>>(...)
// this one obviously works but kind of defeats the purpose, but at least it gets rid of my error
unitsSchema.pre<any>(...)
also want ot mention the code works fine as javascript, it must be an error or limitation in the type declarations.. or maybe I'm just not supposed to be accessing those fields from the Query this ?
I use jooq to generate objects against a local database, but when running "for real" later in production the actual databases will have different names. To remedy this I use the <outputSchemaToDefault>true</outputSchemaToDefault> config option (maven).
At the same time, we have multiple databases (schemas), and are using a connection pool to the server like "jdbc:mysql://localhost:3306/" (without specifying a database here).
How do I tell jooq which database to use when running queries?
I have tried all config I can think of:
new Settings()
.withRenderSchema(true) // true/false seems to make no difference.
.withRenderCatalog(true) // true/false seems to make no difference.
.withRenderMapping(new RenderMapping()
.withDefaultSchema("my_database") // Seems to have no effect.
// The above 3 configs always give me an error saying "no database selected".
// Adding this gives me 'my_database.my_table' does not exist - while it actually does.
.withSchemata(new MappedSchema()
.withInputExpression(Pattern.compile(".*"))
.withOutput("my_database")
));
I have also tried using a database/schema name, as in not configuring outputSchemaToDefault. But then, adding the MappedSchema code above, but that gives me errors with "'my_databasemy_database.my_table' does not exist", which is correct. I have no clue why that code gives me the database/schema name twice?
Edit:
When jooq tells me that the db.table does not exist, if I put a break point in a good place and get the sql from jooq and run exactly that against my database it does work. But jooq fails to run it.
Also, I'm using version 3.15.3 of jooq.
I solved it. Instead of using .withInputExpression(Pattern.compile(".*")), it seems to work with .withInput("").
I'm still not sure why it works, or if this is the "correct" way of solving it. But at least it is a way forward.
No clue why using the pattern, I got the name twice though. But that one I'll leave alone.
I wanted to store a data type of Code in my MongoDB database per the docs.
The issue is that when I use Mongoose to specify this type, I get an error:
ReferenceError: Code is not defined
And yes, Mongoose's doc's don't have a type of Code.
Say I want to save Javascript code in my MongoDB database, how could I do so?
For more insight into why I am doing this: I want to save Puppeteer scripts in the database, and using the FS module add them to a file, execute them and send the results as a response object back to the client.
Right now, the code is saved as String, which seems to cause execution errors.
For more information, please don't hesitate to ask.
Thank you,
I recently started using Node.js + Express.js (generated with pug) + pg-promise for handling db.
My first target is to obtain data from Postgres (already set up) and display it pretty using render and pug. Let's say it is user list from Users table.
On this restful tutorial I have learned how to get data and return it as JSON - it worked.
Based on Mozilla's tutorial I seperated my code:
routes/users.js: where for '/' I call user_controller.user_list method (using router.get)
controllers/userController.js I have exported user_list where I would like to ask model for data and call render if I have results
queries.js which is kinda my model? But I'm not sure. It has API: connection to db with promises and one function for every query I am going to use in Controllers. I believe I should have like one Model file per table (or any logical entity) but where to store pgp connections?
This file is based on first tutorial I mentioned
// queries.js (connectionString is set properly to my postgres)
var pgp = require('pg-promise')(options);
var db = pgp(connectionString);
function getUsers(req, res, next) {
db.any('SELECT (user_id, username) FROM public.users ORDER BY user_id ASC LIMIT 1000')
.then(function (data) {
res.json({ data: data });
})
.catch(function (err) {
return next(err);
});
}
module.exports = {
getUsers: getUsers
};
Here starts my problem as most tutorials uses mongoose which is very model-db-schema-friendly and what I have is simple 'SELECT ...' string I pass to pg-promise's any() function.
Therefore I have no model class like User.
In userControllers.js I don't know how to call getUsers() to handle its data. Returning JS object from getUsers() would be nice.
Also: where should I call render? In controller or only in
db.any(...).then(function (data) { <--here--> })
Before, I also tried to embed whole Postgres handling into Controller but from db.any() I got this array for handling:
[{ row: '(1,John)' },{ row: '(2,Amy)' },{ row: '(50,Peter)' } ]
Didn't know how go from there as I probably lost my API functionality as well ;-)
I am browsing through multiple tutorials how to handle MVC but usually they handle MongoDB and
satisfy readers with res.send() not render().
I am not sure that I understand what your question is exactly about, but since I do not have enough reputation to comment, I'll do my best to help you with your interrogations. :)
First, regarding the queries.js file, it is IMO not exactly a model, but rather a DAO (Data Access Object) file. DAO comes between you Model (which is actually you database) and your Controller layers. There usually is a DAO file per object (User, Pet, whatever you want) in your data model.
When the data model is rather complex, it can be useful to use an Object Relational Mapping (ORM) such as Mongoose to map your database and execute complexe processes on your objects. In such a case, you might need a specific file per object so as to describe your model and store your queries. But since you don't need an ORM, you DAO can directly interact with your database. That is why you do not have a User.js file.
Regarding the way the db object should be used, I think you should refer directly to pg-promise documentation on the matter.
IMPORTANT: For any given connection, you should only create a single
Database object in a separate module, to be shared in your application
(see the code example below). If instead you keep creating the
Database object dynamically, your application will suffer from loss in
performance, and will be getting a warning in a development
environment (when NODE_ENV = development)
As a matter of fact, a db object in pg-promise sort of represents the database itself and is actually designed for the simultaneous use of several databases, which does not seem to be your case for the moment.
Finally, when it comes to the render function, I believe it should be in the controller, as your DAO is not supposed to know how the data it has gathered is going to be used.
Modularity is always a time-saving choice on the long-term.
Furthermore, note that you might later need a Business Layer between your DAO and your controller, in order to preprocess and postprocess data you are going to persist or to display. In such a case, if you need for instance to ask for data from your database, you will need to render data after it is processed by the Business layer. If the render is made in the DAO layer, it will not be possible.
In the link I provided earlier to pg-promise's db object connection, you will also find documentation on the any() method. You might already have looked it up.
It specifically states that it returns
A promise object that represents the query result:
When no rows are returned, it resolves with an empty array.
When 1 or more rows are returned, it resolves with the array of rows.
so your returned data is a JS Array. If you want to make it a JS object, just use
JSON.stringify(yourArray) to process your data before rendering it in your controller.
But I wonder if Pug is not able to use your data directly.
Also, if you cannot get any data out of your DAO, maybe you should check that your data object is not empty, as such a case is tolerated by the any() method. If you expect your query to always return something, you might want to consider using the many() or the one() methods.
I hope this helps you.
i stared new project with flask web-framework with mongoDB. i also used database and access data using Flask-MongoAlchemy. i tried work on different query like .all(), .filter_by(), .get() its work nice. but problem is that how to use aggregate funcation in Flask-MongoAlchemy ? for example i want to use group_by.
i tried following but its still not working.
db.User.qroup_by(name)
its gives following error
'BaseQuery' object has no attribute 'group_by'