The document discusses search capabilities in FHIR, including: 1. FHIR supports searching resources through parameters and queries to address use cases like finding a patient's record or running analytics. 2. Parameters can represent data types like numbers, dates, strings, and references between resources. 3. Indexing resources involves extracting searchable fields and mapping data types between parameters and resource contents.

1. SEARCH
for
server developers
Martijn Harthoorn
FHIR Developer Days
November 24, 2014
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2. Who am I?
 Name: Martijn Harthoorn
 Company: Furore
 Background:
 Programmer in C# (mainly)
 Team leader Furore FHIR team
 Programmer of
 Spark Search Engine
 Spark custom-profile resource validator
2
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3. 3
Let’s talk about…
Understanding what’s behind the question mark.
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4. 4
Let’s talk about…
FHIR Paradigm
FHIR client should be easy.
FHIR server needs to solve the complex issues.
Search has some…
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5. 5
Overview
1. Why we need search?
2. How does FHIR solve that?
3. What does the spec say?
4. How do we implement that technically?
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6. 6
Fhir without search
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7. 7
Fhir without search
1. CRUD
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8. 8
Fhir without search
GET [base]/Patient/[id]
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9. 9
Use cases
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10. 10
UC1: The registrar
"patient forgot hospital card (with id)"
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UC2: The doctor
“give me all data on patient x”
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12. 12
UC3: The researcher
“give me all data on
a specific allergy
that conforms to a set of conditions”
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13. 13
UC4: The manager
“how many patients did we treat last month”
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14. 14
UC5: The lab
“Give me the list of tests to process”
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15. 15
UC6: The nurse
“Alert me on any patient with
a measurement in the danger zone.”
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16. 16
UC Summary
- the registrar
- the doctor
- the researcher
- the manager
- the lab worker
- the nurse
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17. 17
Solutions in FHIR
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18. 18
Search Solutions in FHIR
URL/[resource]?<parameters>
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19. 19
Search solution 2 of FHIR
Query
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20. 20
Parameter types
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21. 21
Parameters types
number
date
string
token
reference
quantity
composite
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22. 22
FHIR Data types
Primitive data types
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23. 23
FHIR Data types
Complex data types
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24. 24
Mapping of number
Parameter data type Content data type
number integer
~/Procedure?date=>2010-01-01&date=<2011-12-31
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25. 25
Mapping of date
Parameter data type Content data type
date
Date
DateTime
Period
Instant
~/Procedure?date=>2010-01-01&date=<2011-12-31
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26. 26
Mapping of string
Parameter data type Content data type
string
String
HumanName
~/Patient?name=eve
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27. 27
Mapping of token
Parameter data type Content data type
token
Coding
Codeable concept
~/Patient?name=eve
Identifier
(Code)
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28. 28
Mapping of quantity
Parameter data type Content data type
quantity Quantity
~/Patient?name=eve
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Mapping of reference
Parameter data type Content data type
reference Uri
~/condition?subject:Patient=23
(Local id)
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F. Mapping of Value[x]
Parameter data type Content data type
value-concept value[x]
value-date
value-quantity
value-string
~/condition?subject:Patient=23
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31. 31
Returned parameters
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History
Version 1.
 Patient only
 Per parameter
 No meta data
 No index
Limited
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History
Version 2.
 All resources
 Self generated meta data
 Indexing in Lucene
 Client side joins
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History
Version 3.
 All resources
 Model meta data
 Indexing in Mongo
Even faster!
changes in the standard
are now applied automatically
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35. 35
Indexing
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36. 36
Indexing
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37. 37
Indexing
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38. 38
Indexing
REST Service
Storage
Index
&
Search
DB
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39. 39
How to index?
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40. 40
How to index?
<family value=“Chalmers”>
chalmers
Patient?name=chal
chal*
match
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41. 41
How to index?
<valueQuantity=“10g”>
0.1
value-quantity=>0.1||kg
> 0.05
kg = kg
http://unitsofmeasure.org =
http://unitsofmeasure.org
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42. 42
Indexing in Mongo:
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43. 43
K. Debugging
To test a client – you must have a tested server
To test a server – you must have a tested client
“One fool can ask more questions than seven wise men can answer”
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44. 44
Debugging
Sprinkler
(testtool)
Spark MongoDB
Fiddler
Visual Studio Visual Studio MongoVue
“One fool can ask more questions than seven wise men can answer”
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45. 45
Logic and filtering
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46. 46
Logic and filtering
a=x & c=y & e=z
a=x & a=y
a=b,d
a-b=c$d
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47. 47
Logic and filtering
URL?a=A&a=A2&c=C1,C2&d-e-=D&E
AND
EQ a=A2 OR
c=C1 c=C2
ELEM
AND
d=D e=E
a A
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48. 48
_include
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49. 49
Chained parameters
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50. 50
Paging
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51. 51
Canonical search
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52. 52
Canonical search
UCUM
http://unitsofmeasure.org/
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53. 53
Fuzzy search
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54. 54
Fuzzy search
1. STARTS WITH
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55. 55
Fuzzy search
2. LIKE
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56. 56
Fuzzy search
3. SOUNDEX
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57. 57
Fuzzy search
4. Damerau-Lehvenstein
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58. 58
Fuzzy search
5. More advanced searching
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59. 59
Full text search
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