fetch Data from a db column to drop down component

RE: fetch Data from a db column to drop down component

Mike Schmitt — Wed, 12 Jun 2024 14:58:45 GMT

[quote userid="265396" url="~/discussions/f/user-interface/12363/fetch-data-from-a-db-column-to-drop-down-component/136761"]My requirement is to fetch unique values from DB column with the help of record type [/quote]

FWIW, you have posted this follow-up question to an extremely old thread (from before RecordType data was even usable for your use case). It'd usually be better to either find a newer thread on the subject or start your own.

RE: fetch Data from a db column to drop down component

Yogi Patel — Wed, 12 Jun 2024 14:39:59 GMT

You have added a grouping clause hence in the query. Hence, it will return unique project manager names. User filter expect Facet type object. Hence, your code is correct. You need to enter your code in "Filter Expression" available in User Filters.

See the screenshot below for reference:

RE: fetch Data from a db column to drop down component

Niharika — Wed, 12 Jun 2024 13:39:07 GMT

My requirement is to fetch unique values from DB column with the help of record type to populate in dropdown values. I have used this code

a!localVariables(

local!projectManager: a!queryRecordType(
recordType:XYZ Record type,
fields: a!aggregationFields(
groupings: {
a!grouping(
field: XYZ Record type.field,
alias: "projectManager"
)
}
),
pagingInfo: a!pagingInfo(startIndex: 1, batchSize: 5000)
),

a!recordFilterList(
name: "projectManager",
options: a!forEach(
items: local!projectManager.data,
expression: a!recordFilterListOption(
id: fv!index,
name: fv!item.projectManager,
filter: a!queryFilter(
field: XYZ Record type.field,
operator: "=",
value: fv!item.projectManager
)
)
)
),
)

But this returns a Facet type object which has many fields and i want to access some specific field which contains unique values

RE: fetch Data from a db column to drop down component

Niharika — Wed, 12 Jun 2024 13:26:19 GMT

what is i have record type not entity

RE: fetch Data from a db column to drop down component

Apoorv Gangwar — Thu, 17 May 2018 06:33:24 GMT

Hi,
Follow these steps:
1. write query entity to fetch that column
2. save only that column data in a local variable, let's suppose local!a
3. give local!finalData: union(local!a,local!a)
4. use local!finalData in choiceValues and choiceLabels

Note: 3rd step might give error saying can't perform union on local!a, in this scenario write below line:
local!finalData: union(touniformString(local!a),touniformString(local!a))

RE: fetch Data from a db column to drop down component

nalinib0001 — Thu, 17 May 2018 03:31:24 GMT

ok Got it ,Thanks

RE: fetch Data from a db column to drop down component

nalinib0001 — Thu, 17 May 2018 03:30:57 GMT

Thanks for the code..

RE: fetch Data from a db column to drop down component

davel001150 — Wed, 16 May 2018 12:49:16 GMT

Yes, you don't want to waste bandwidth pulling more data than you need only to remove duplicates after you've pulled.

Another option would be to create a constant with all the unique values, along with a Stored Procedure you can call when needed or on a schedule to update the constant to match the lookup table. This way, you run the query say every 2 weeks instead of every single time any user goes to the form that uses the dropdown. You need to look at how frequently this list of unique values changes. If it's not that frequent you might consider this option. If it doesn't change (every new row uses a value that has already been used before), I would do only the constant and no SP or query at all.

RE: fetch Data from a db column to drop down component

sureshg57 — Wed, 16 May 2018 11:42:32 GMT

nalinib0001

If you are fetching the initial data using a query entity or even calling an Stored Procedure, we can use groupby using the column which is required. This will get unique data for the column and no need to doing extra manipulation of data in Appian side.

for ex:

local!mydropdownlaluves: a!queryEntity(
entity: cons!MY_DATASTORE,
query: a!query(
aggregation: {
a!queryAggregation(
aggregationColumns: a!queryAggregationColumn(
field: "MY_VALUE_COLUMN",
isGrouping: true()
)
)
},
pagingInfo: rule!APN_pagingInfoAll()
)
)

Regards
Suresh

RE: fetch Data from a db column to drop down component

Abhay Giri — Mon, 14 May 2018 00:23:17 GMT

Hi Nalini,

I am guessing the table which you are using the populate the data in your drop down component is not lookup table. So use look up table from where these data (india,india,india,......) is coming then your drop down will work, no need to use any functions.

But still you are facing the issue then use code suggested by Prakash with slightly change,it will give you better performance :

load(

local!data:index(local!variable,"columnname" {})
local!dropDownOptions: union(
local!data,
local!data
),
-------
-------
------..etc,
a!dropdownField(

label: " ",
placeholderLabel: "--select --",
choiceLabels: local!dropDownOptions,
choiceValues:local!dropDownOptions,
value: {},
saveInto:{}
)

Regards
Abhay

RE: fetch Data from a db column to drop down component

nalinib0001 — Thu, 10 May 2018 04:44:21 GMT

Thanks will try it!!

RE: fetch Data from a db column to drop down component

nalinib0001 — Thu, 10 May 2018 04:43:45 GMT

Thanks will try this..

RE: fetch Data from a db column to drop down component

ChristineLHutchison — Sun, 06 May 2018 19:02:28 GMT

The values must be unique. As mentioned in the response, union will remove duplicates. However, the better approach may be to create a lookup table of values. That table should have and ID (pk) and text. The ID can be a number (sequence) for normalization or the text value.
If you are querying a table that just continues to grow and have more and more records, the union will start to slow and may degrade performance.

RE: fetch Data from a db column to drop down component

prakashb9987 — Fri, 04 May 2018 11:48:26 GMT

Hi Nalini ,

For choice values it won't allow duplicate values for ignoring that
can you try the bellow

load(

local!data:index(local!variable,"columnname" {})
-------
-------
------..etc,
a!dropdownField(

label: " ",
placeholderLabel: "--select --",
choiceLabels: union(
local!data,
local!data
),
choiceValues: union(
local!data,
local!data
),
value: {},
saveInto:{}
)

may it helps you.....

Thanks