web-sql

The problem: I need a device agnostic (e.g. HTML5) solution for storing and querying 250,000+ rows of data offline on a phone or tablet type device (e.g. iOS/Android). The idea being I have people working in remote areas without any cellular data connection and they need to run queries on this data and edit it while offline. Partly it will be geo-location based so if there are assets in the area they are in (uses GPS) then it will show those assets and let them be edited. When they return to the office they can sync the data back to the office server. The reason that I'm approaching this from

I'm trying to delete a column in a websql database with javascript. I have tried the following with no success: db.transaction( function(transaction) { transaction.executeSql('ALTER TABLE log_entries DROP COLUMN name;'); } ); where, name is the column I want to delete from the table log_entries. Could someone please advise me how I would go about deleting a column in a websql database with javascript? In the Web SQL is not implemented removing fields. I'm currently working on this problem. One of way - data dump and remove the table. Then restore the table with the new fields. Restore the data

I have a webapp that I'm building, and have just started with SQLite. I have been able to create my form, open the database I created, create the table, and fields i need, and enter data into the fields. Now I'm trying to read the data back out with a SELECT statement, to show it on screen and as a list of the columns. I just don't know the syntax for the SELECT statemnt in javascript or HTML5 beyond 'SELECT * FROM MyTable'...I know it can be done, just need some help with the syntax of getting the results onto the screen. I start with this. var db = window.openDatabase('TabOrder', '', 'Bar

In windows 7 chrome latestVersion 75.0.3770.80 (Official Build) (64-bit) got an error while get data and write data to chrome browser db in web sql. "unable to begin transaction (3850 disk I/O error)". Do you know any solution to this issue? This issue happens if you edit (insert/replace/update) the same data to the same table at the same time. One of the possible cases is you're having 2 tabs opened that access the same database. This is chrome regression since it was working before v75. Possible solutions are: You could either wait until it gets fixed in chrome. You could implement a manual

I've been fetching rows from a WebSQL DB, and the returned rows seems to be readonly. db.readTransaction( function(t1) { t1.executeSql( "SELECT * FROM Foo WHERE id = ?", [1], function(t2, resultSet){ var foo = resultSet.rows.item(0); console.log("before: " + foo.col1); foo.col1 = "new value"; console.log("after: " + foo.col1); console.log("sealed? " + Object.isSealed(foo)); console.log("frozen? " + Object.isFrozen(foo)); } ); } ); It prints: before: old value after: old value sealed? false frozen? false I had to manually clone the row to be able to modify it. How is this possible? How can an

WebSQL and IndexedDB are both DB API for accessing (CRUD) the underlying embedded database in the web browser. Which, if I am correct, is like SQL for accessing (CRUD) any client-server database like Oracle etc. (in many case support for both WebSQL and IndexedDB is available on same browser) So, does it mean that both WebSQL and IndexedDB are accessing (CRUD) the same underlying embedded database and if that it the case then it will have same performance on all web browsers! But I think that is not the case, so does it mean that a web browser will have more than one underlying embedded