How to get a count of database rows in Appian web api

RE: How to get a count of database rows in Appian web api

davidb545 — Thu, 30 Jan 2020 01:08:24 GMT

thanks heaps for the tip! :-)

RE: How to get a count of database rows in Appian web api

Mike Schmitt — Wed, 29 Jan 2020 15:15:51 GMT

As an aside, you should definitely not use the batchsize of "-1" when just getting the .totalCount, as this returns all rows in the query, which you would then proceed to ignore. Instead, use a batch size of "0", as this actually pulls the metadata (including totalCount) without doing the work of returning all rows. This will be significantly better for performance.

RE: How to get a count of database rows in Appian web api

davidb545 — Wed, 29 Jan 2020 07:08:56 GMT

Ok - I have got the code working now - the final code is this:

with(
local!entities: a!queryEntity(
entity: cons!MY_DATABASE_TABLE_DS,
query: a!query(
pagingInfo: a!pagingInfo(
startIndex: 1,
batchSize: 10
)
),
fetchTotalCount: true
).totalCount,
a!httpResponse(
headers: {
a!httpHeader(name: "Content-Type", value: "application/json")
},
body: a!toJson({count: local!entities})
)
)

The only difference was that I added a batch size of 10. It [nevertheless] returns the correct number of rows in the database...

thanks heaps for your help.

David :-)

RE: How to get a count of database rows in Appian web api

davidb545 — Wed, 29 Jan 2020 07:04:39 GMT

Thanks Ekansh - I have updated the code to this:

with(
local!entities: a!queryEntity(
entity: cons!MY_DATABASE_TABLE_DS,
query: a!query(
pagingInfo: a!pagingInfo(
startIndex: 1,
batchSize: -1
)
),
fetchTotalCount: true
).totalCount,
a!httpResponse(
headers: {
a!httpHeader(name: "Content-Type", value: "application/json")
},
body: a!toJson({count: local!entities})
)
)

However, it still shows error 500. I am wondering if there is too much data? There are about 7000 rows in the relevant database table - so I wouldn't have thought it was too big - do you think it is?

cheers,

David.

RE: How to get a count of database rows in Appian web api

ekanshj — Wed, 29 Jan 2020 06:48:20 GMT

Hi davidb545
You need to change the way you pass the body of the response

RE: How to get a count of database rows in Appian web api

davidb545 — Wed, 29 Jan 2020 06:31:54 GMT

I have [also] tried writing a seperate api which [only] returns the row-count for my entity, but it [also] returns error 500...

a!localVariables(
  local!entities: a!queryEntity(
    entity: cons!MY_DATABASE_TABLE_DS,
    query: a!query(
      pagingInfo: a!pagingInfo(
        startIndex: 1,
        batchSize: -1
      )
    ),
    fetchTotalCount: true
  ).totalCount,
  a!httpResponse(
        headers: {
      a!httpHeader(name: "Content-Type", value: "application/json")
    },
    body: a!toJson(value: local!entities)
  )
)