QueryReduce

Last updated on May 30, 2024 | Also applies to ColdFusion

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CFML Reference User Guide
ColdFusion functions
ColdFusion tags
1. ColdFusion tag summary
2. ColdFusion tags by category
  1. Application framework tags
    1. cfapplication
    2. cfassociate
    3. cferror
    4. cfimport
    5. cfinterface
    6. cflock
    7. cfscript
    8. cfthread
  2. Communications tags
  3. Database manipulation tags
  4. Data output tags
    1. cfchart
  5. Debugging tags
    1. cfdump
    2. cftimer
    3. cftrace
  6. Exception handling tags
    1. cfcatch
    2. cferror
    3. cffinally
    4. cfrethrow
    5. cfthrow
    6. cftry
  7. Extensibility tags
    1. cfchart
    2. cfchartdata
    3. cfchartseries
    4. cfcollection
    5. cfcomponent
    6. cfexecute
    7. cfftp
    8. function
    9. cfindex
    10. cfinterface
    11. cfinvoke
    12. cfinvokeargument
    13. cfobject
    14. cfproperty
    15. cfreport
    16. cfreportparam
    17. cfreturn
    18. cfsearch
    19. cfsharepoint
    20. cfspreadsheet
    21. cfwddx
    22. cfxml
  8. File management tags
    1. cfdirectory
    2. cffile
    3. cffileupload
    4. cfftp
    5. cfzip
    6. cfzipparam
  9. Flow-control tags
    1. cfabort
    2. cfbreak
    3. cfcase
    4. cfcontinue
    5. cfdefaultcase
    6. cfelse
    7. cfelseif
    8. cfexecute
    9. cfexit
    10. cfif
    11. cfinclude
    12. cflocation
    13. cfloop
    14. cfrethrow
    15. cfswitch
    16. cfthrow
    17. cftry
  10. Forms tags
    1. cfapplet
    2. cfcalendar
    3. cffileupload
    4. cfform
    5. cfformgroup
    6. cfformitem
    7. cfgrid
    8. cfgridcolumn
    9. cfgridrow
    10. cfgridupdate
    11. cfinput
    12. cfpdf
    13. cfpdfform
    14. cfpdfformparam
    15. cfpdfparam
    16. cfpdfsubform
    17. cfselect
    18. cfslider
    19. cftextarea
    20. cftree
    21. cftreeitem
  11. Internet Protocol tags
    1. cfajaximport
    2. cfajaxproxy
    3. cfftp
    4. cffeed
    5. cfimap
    6. cfhttp
    7. cfhttpparam
    8. cfldap
    9. cfmail
    10. cfmailparam
    11. cfmailpart
    12. cfpop
    13. cfsprydataset
  12. Page processing tags
    1. cfcache
    2. cfcontent
    3. cfflush
    4. cfheader
    5. cfhtmlhead
    6. cfinclude
    7. cfprocessingdirective
    8. cfsetting
    9. cfsilent
  13. Security tags
  14. Variable manipulation tags
    1. cfcookie
    2. cfdump
    3. cfparam
    4. cfregistry
    5. cfsavecontent
    6. cfschedule
    7. cfset
    8. cfsetting
  15. Other tags
    1. cfimage
    2. cflog
    3. cfregistry
3. Tags a-b
4. Tags c
5. Tags f
6. Tags g-h
  1. cfgraph
  2. cfgraphdata
  3. cfgrid
  4. cfgridcolumn
  5. cfgridrow
  6. cfgridupdate
  7. cfheader
  8. cfhtmlhead
  9. cfhtmltopdf
  10. cfhtmltopdfitem
  11. cfhttp
  12. cfhttpparam
7. Tags i
  1. cfif
  2. cfimage
  3. cfimap
  4. cfimapfilter
  5. cfimpersonate
  6. cfimport
  7. cfinclude
  8. cfindex
  9. cfinput
  10. cfinsert
  11. cfinterface
  12. cfinvoke
  13. cfinvokeargument
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9. Tags m-o
10. Tags p-q
  1. cfparam
  2. cfpdf
  3. cfpdfform
  4. cfpdfformparam
  5. cfpdfparam
  6. cfpdfsubform
  7. cfpod
  8. cfpop
  9. cfpresentation
  10. cfpresentationslide
  11. cfpresenter
  12. cfprint
  13. cfprocessingdirective
  14. cfprocparam
  15. cfprocresult
  16. cfprogressbar
  17. cfproperty
  18. cfquery
  19. cfqueryparam
11. Tags r-s
  1. cfregistry
  2. cfreport
  3. cfreportparam
  4. cfrethrow
  5. cfreturn
  6. cfsavecontent
  7. cfschedule
  8. cfscript
  9. cfsearch
  10. cfselect
  11. cfservlet
  12. cfservletparam
  13. cfset
  14. cfsetting
  15. cfsharepoint
  16. cfsilent
  17. cfslider
  18. cfspreadsheet
  19. cfsprydataset
  20. cfstoredproc
  21. cfswitch
12. Tags t
  1. cftable
  2. cftextarea
  3. cftextinput
  4. cfthread
  5. cfthrow
  6. cftimer
  7. cftooltip
  8. cftrace
  9. cftransaction
  10. cftree
  11. cftreeitem
  12. cftry
13. Tags u-z
  1. cfupdate
  2. cfwddx
  3. cfwebsocket
  4. cfwindow
  5. cfxml
  6. cfzip
  7. cfzipparam
CFML Reference
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Cloud services

Description

This function iterates over each row of a query and calls the closure function to work on the row of the query. This function reduces the query to a single value that would be returned.

Returns

The result returned by the last invocation of reduce function (with the last row).

Category

Query functions

History

New in Adobe ColdFusion (2016 release)

See also

QueryMap

Syntax

Object QueryReduce(Object query , UDFMethod reduceFunc [, Object initialValue])

Object QueryReduce(Object query , UDFMethod reduceFunc [, Object initialValue])

Parameters

Parameter	Description
query	(Required) The query to be iterated over.
reduceFunc	(Required) The reduce function to be called with each row of the query.
initialValue	(Optional) The value to be passed to reduce function for the first row.

Example 1

myQuery = queryNew("id,name,amount","Integer,Varchar,Integer",

[

{id=1,name="One",amount=15},

{id=2,name="Two",amount=18},

{id=3,name="Three",amount=32},

{id=3,name="Four",amount=35}

]);

addAges=QueryReduce(myQuery,function(sum,obj){

sum=sum+obj.amount

return sum

},0)

writeOutput("The sum of all amount is: " & addAges)

</cfscript>

<cfscript> myQuery = queryNew("id,name,amount","Integer,Varchar,Integer", [ {id=1,name="One",amount=15}, {id=2,name="Two",amount=18}, {id=3,name="Three",amount=32}, {id=3,name="Four",amount=35} ]); addAges=QueryReduce(myQuery,function(sum,obj){ sum=sum+obj.amount return sum },0) writeOutput("The sum of all amount is: " & addAges) </cfscript>

<cfscript>
    myQuery = queryNew("id,name,amount","Integer,Varchar,Integer", 
                [ 
                        {id=1,name="One",amount=15}, 
                        {id=2,name="Two",amount=18}, 
                        {id=3,name="Three",amount=32},
                        {id=3,name="Four",amount=35}
                ]); 
    addAges=QueryReduce(myQuery,function(sum,obj){
        sum=sum+obj.amount
        return sum
    },0)
    writeOutput("The sum of all amount is: " & addAges)
</cfscript>

Example 2

qoptions = {result="myresult", datasource="cfbookclub", fetchclientinfo="yes"};

sampleQuery = QueryExecute("select * from books order by bookid", [] ,qoptions);

temp = "";

titles = QueryReduce(sampleQuery, function(temp, element){

temp = temp?:"";

temp = temp & element.TITLE & " | ";

return temp;

});

writeOutput(titles);

</cfscript>

<cfscript> qoptions = {result="myresult", datasource="cfbookclub", fetchclientinfo="yes"}; sampleQuery = QueryExecute("select * from books order by bookid", [] ,qoptions); temp = ""; titles = QueryReduce(sampleQuery, function(temp, element){ temp = temp?:""; temp = temp & element.TITLE & " | "; return temp; }); writeOutput(titles); </cfscript>

<cfscript>
               qoptions = {result="myresult", datasource="cfbookclub", fetchclientinfo="yes"};
               sampleQuery = QueryExecute("select * from books order by bookid", [] ,qoptions);
               
               temp = "";
               titles = QueryReduce(sampleQuery, function(temp, element){
                              temp = temp?:"";
                              temp = temp & element.TITLE & " | ";
                              return temp;
               });
               writeOutput(titles);
</cfscript>

The script returns a string of appended titles.

Using member function

myResult=QueryExecute("SELECT * FROM EMPLOYEES",[],{datasource="cfdocexamples"});

myArray=ArrayNew(1);

// Populate myArrray with random values between 25-45

for (i=1;i<=myResult.recordcount;i++){

myArray[i]=randrange(25,45);

}

// Add column Ages and populate with values of myArray

QueryAddColumn(myResult,"Ages","integer",myArray);

// Use reduce function to calculate the average age of all persons in the recordset

// Initialize age in closure

status=myResult.reduce(function(age=0,col){

return age+col.Ages/myResult.recordcount;

});

WriteOutput(status);

</cfscript>

<cfscript> myResult=QueryExecute("SELECT * FROM EMPLOYEES",[],{datasource="cfdocexamples"}); myArray=ArrayNew(1); // Populate myArrray with random values between 25-45 for (i=1;i<=myResult.recordcount;i++){ myArray[i]=randrange(25,45); } // Add column Ages and populate with values of myArray QueryAddColumn(myResult,"Ages","integer",myArray); // Use reduce function to calculate the average age of all persons in the recordset // Initialize age in closure status=myResult.reduce(function(age=0,col){ return age+col.Ages/myResult.recordcount; }); WriteOutput(status); </cfscript>

<cfscript>
       myResult=QueryExecute("SELECT * FROM EMPLOYEES",[],{datasource="cfdocexamples"});
       myArray=ArrayNew(1);
       
       // Populate myArrray with random values between 25-45
       for (i=1;i<=myResult.recordcount;i++){
             myArray[i]=randrange(25,45);
             
       }
       // Add column Ages and populate with values of myArray
       QueryAddColumn(myResult,"Ages","integer",myArray);
       
       // Use reduce function to calculate the average age of all persons in the recordset
       // Initialize age in closure
       status=myResult.reduce(function(age=0,col){
             return age+col.Ages/myResult.recordcount;
       });
       
       WriteOutput(status);
</cfscript>

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QueryReduce

Description

Returns

Syntax

Parameters

Example 1

Example 2

Using member function

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