I am looking to update my dexie values from null to empty strings

Question

I am looking to update my dexie values from null to empty strings

I am facing an issue where the data-table values with null entries need to be replaced with empty strings.

There are instances when the department value is empty, resulting in null entries in the data tables.

db = db_open();

db.fuel.toArray().then(fuel => {
  fuel.forEach(function(fuel) { 
    $('#table_bod').append('<tr> <td>'+fuel.department+'</td> </tr> ');
  })
});

I attempted the following:

const fuels = db.fuel.where({department: null});

However, this solution does not seem to be effective.

javascript database datatable dexie

Answer 1

Answer №1

IndexedDB is unable to compare against null values, so if you want to locate those, a complete table scan is necessary.

const fuelsWithoutDepartment = await db.fuel
  .filter(x => x.department === null)
  .toArray();

To address this, you can create an upgrader that changes all null departments to empty strings if that is preferred over null:

db.version(2).stores({
  fuel: 'id, department'
}).upgrade (tx => {
  return tx.fuel.filter(
    x => x.department === null
  ).modify({department: ""});
});

After implementing this upgrader (adjusting version, id, and indexes as needed), you can now utilize the department index (if available) instead of performing a full table scan to find fuels without departments:

const fuelsWithoutDepartment = await db.fuel
  .where({department: ""})
  .toArray();

Answer 2

IndexedDB is unable to compare against null values, so if you want to locate those, a complete table scan is necessary.

const fuelsWithoutDepartment = await db.fuel
  .filter(x => x.department === null)
  .toArray();

To address this, you can create an upgrader that changes all null departments to empty strings if that is preferred over null:

db.version(2).stores({
  fuel: 'id, department'
}).upgrade (tx => {
  return tx.fuel.filter(
    x => x.department === null
  ).modify({department: ""});
});

After implementing this upgrader (adjusting version, id, and indexes as needed), you can now utilize the department index (if available) instead of performing a full table scan to find fuels without departments:

const fuelsWithoutDepartment = await db.fuel
  .where({department: ""})
  .toArray();

I am looking to update my dexie values from null to empty strings

Answer №1

Similar questions

'An error occurred when invoking the class method due to 'This' being undefined

The ajax function is malfunctioning when called from an external JavaScript file

Interactive image rotator featuring navigation buttons for next and previous slides

The functionality of ng-click and ng-submit seems to be malfunctioning

Specific category of location on Google Maps

Div Randomly Transforms Its Vertical Position

Leveraging .tsx components within nested .tsx components in React Native

Achieve the retrieval of both categories and sub-categories in one consolidated API response

Expand an image to its full dimensions when it is initially loaded

Implement tooltip functionality in ssr chart using echarts

Utilizing JQuery to recycle data post-load

A handy tip for sending a response once a for each loop has finished executing

ClickEvent (or element selector) is experiencing functionality issues

What makes realtime web programming so fascinating?

Exploring the Depths of NodeJS X-Ray Web-Scraper: Uncovering Hidden Gems within Sub Pages

Tips for updating React context provider state when a button is clicked

Using TypeOrm QueryBuilder to establish multiple relations with a single table

Unique Database Solutions

Leverage the power of AJAX and PHP to securely save comments for future

The error message "SQLAlchemy OperationalError table not found" indicates that