What is the correct way to execute the query "select * from table where indexA >= 'a' order by indexB ASC limit 10" in indexedDB?

As I delve into learning about javascript IndexedDB, I have encountered a challenge in executing complex queries. My goal is to perform a select query like this one:

"select * from table where indexA >= 'a' order by indexB ASC limit 10"

I attempted to create an index using the code snippet below:

store.createIndex("indexA, indexB", ["indexA","indexB"])

and executed a request in this manner:
store.index("indexA, indexB").openCursor(IDBKeyRange.lowerBound([1, "a"], true))

yet, the outcome only sorted based on indexA. Is there another approach to achieve my desired result?

javascriptindexeddb

Answer №1

In order to achieve the desired outcome, it is necessary for you to perform the roll operation yourself. There are essentially two main methods that can be employed:

  • One approach involves using an index on 'indexA', initiating a cursor with a lower bound of 'a', iterating through the data set, accumulating all relevant results, then sorting by indexB and selecting the top 10 entries.
  • Alternatively, you can utilize an index on 'indexB', open a cursor, iterate through the dataset while skipping any entries where indexA is less than 'a', and stop after encountering 10 eligible entries.

For more in-depth information on this topic, please refer to the linked resource (special thanks to another individual named Josh!).

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