Introduction and overview to using the disconnected FireDAC in-memory dataset: TFDMemTable. It works across all platforms: Android, iOS, Windows, OS X and languages: Object Pascal/Delphi and C++. The TFDMemTable provides much of the same functionality as the TClientDataSet but is available in Professional and up skews of RAD Studio and Appmethod. For more information: http://delphi.org/?p=1933

1. EMBARCADERO
TECHNOLOGIESEMBARCADERO
TECHNOLOGIES
In-­‐Memory
Dataset
TFDMemTable
Jim
McKeeth
Lead
World
Wide
Developer
Evangelist
/
Engineer
jim.mckeeth@embarcadero.com
@JimMcKeeth
/
JimMcKeeth
/
Delphi.org
March
12th,
2015

2. EMBARCADERO
TECHNOLOGIES
This
Skill
Sprint
Works
with
.
.
.
• Windows
• Mac
OS
X
• Android
• iOS
• RAD
Studio
• Appmethod
• Object
Pascal
• C++
• RAD
Studio
XE7
DocWiki
– http://embt.co/latestdocwiki
– http://docwiki.embarcadero.com/RADStudio/en/
• Appmethod
September
2014
DocWiki
– http://embt.co/AppmethodTopics
– http://docwiki.appmethod.com/appmethod/topics/en/
• Appmethod
supports
the
FireMonkey
framework
on
all
4
platforms
while
RAD
Studio,
Delphi
and
C++Builder
also
support
VCL
on
Windows.
Contact
sales
with
any
questions!

3. EMBARCADERO
TECHNOLOGIES
TFDMemTable
the
Disconnected/In-­‐Memory
DataSet
• Design
time
&
Runtime
persistence
functions:
• Load
File,
Save
File
&
Assign
Data
• Streaming
for
multi-­‐tier
applications
• Used
with
REST
client
components,
DataSnap,
etc.
• Combine
with
Local
SQL
for
simple
query
operations
• Use
with
ETL
for
other
data
sources
(plain
text,
csv,
etc.)

4. EMBARCADERO
TECHNOLOGIES
Stream
and
File
Formats
(TFDStorageFormat)
• sfAuto
• Based
on
file
extension
or
binary
• sfBinary
(uses
FireDAC.Stan.StorageBin)
• Most
efficient
-­‐
Signature:
“ADBS”
• sfXML
(uses
FireDAC.Stan.StorageXML)
• <FDBS
Version="14">...
• sfJSON
(uses
FireDAC.Stan.StorageJSON)
• {"FDBS":{"Version":14,
…
4 Image
by
Shane
Porter
-­‐
Used
under
Creative
Commons
https://commons.wikimedia.org/wiki/File:Jeongbang_Waterfall.jpg
Binary
JSON
XML

5. EMBARCADERO
TECHNOLOGIES
Common
Code
Samples
//
Create
Field
Definitions
FDMemTable1.FieldDefs.Add('ID',
ftInteger,
0,
False);
FDMemTable1.FieldDefs.Add('Name',
ftString,
20,
False);
FDMemTable1.CreateDataSet;
//
Append
data
FDMemTable1.Open;
FDMemTable1.AppendRecord([1,
'Jim']);
//
Load
from
another
DataSet
FDMemTable1.CopyDataSet(DataSet1,
[coStructure,
coRestart,
coAppend]);
OP

6. EMBARCADERO
TECHNOLOGIES
Common
Code
Samples
//
Create
Field
Definitions
FDMemTable1-­‐>FieldDefs-­‐>Add("ID",
ftInteger,
0,
False);
FDMemTable1-­‐>FieldDefs-­‐>Add("Name",
ftString,
20,
False);
FDMemTable1-­‐>CreateDataSet();
//
Append
Data
FDMemTable1-­‐>Open();
FDMemTable1-­‐>Append();
FDMemTable1-­‐>FieldByName("ID")-­‐>AsInteger
=
1;
FDMemTable1-­‐>FieldByName("Name")-­‐>AsString
=
"Jim";
FDMemTable1-­‐>Post();
//
Load
from
another
DataSet
FDMemTable1-­‐>CopyDataSet(DataSet1,
TFDCopyDataSetOptions()
<<
coStructure
<<
coRestart
<<
coAppend);
C++

7. EMBARCADERO
TECHNOLOGIES
DEMONSTRATION
TFDMemTable

8. EMBARCADERO
TECHNOLOGIES
TFDMemTable
Summary
• A
TDataSet
for
in-­‐memory
or
disconnected
use.
• Supports
• Copy
from
another
DataSet
• File
and
stream
persistence
• Cached
updates
• Cloned
cursors
• Nested
datasets

9. EMBARCADERO
TECHNOLOGIES
TFDMemTable
Resources
• Samples
– C:UsersPublicDocumentsEmbarcaderoStudio15.0Samples
– Object
PascalDatabaseFireDACSamplesComp
LayerTFDMemTable
– Object
PascalDatabaseFireDACSamplesComp
LayerTFDLocalSQL
• DocWiki
– http://docwiki.embarcadero.com/Libraries/en/FireDAC.Comp.Client.TFDMemTable
– http://docwiki.embarcadero.com/Libraries/en/FireDAC.Comp.Client.TFDCustomMemTable
– http://docwiki.embarcadero.com/RADStudio/en/TFDMemTable_Questions
• Blog
Posts
– CodeRage
9
Video:
TFDMemTable
&
CDS
Compared
http://youtu.be/iNgHJakYWkU
– Q&A
log:
http://wiert.me/2014/10/30/coderage-­‐9-­‐qa-­‐log-­‐clientdatasets-­‐and-­‐fdmemtables-­‐compared/
– CodeRage
9
FireDAC
Tips,
Tricks
and
News:
http://youtu.be/gljfudAKlTI
– All
these
links
and
more:
http://delphi.org/?p=1933
https://commons.wikimedia.org/wiki/File:Iceberg.jpg

10. EMBARCADERO
TECHNOLOGIES
Next
Time….
• Preview:
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11. EMBARCADERO
TECHNOLOGIES
Next
Time….
• FireDAC:
Local
SQL
• Execute
SQL
on
in-­‐memory
DataSets
• Works
with
multiple
DataSets
• Thursday
the
19th
of
March
– 6AM
San
Francisco
/
9AM
New
York
/
1PM
London
/
2PM
Milan
/
13
UTC
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San
Francisco
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New
York
/
6PM
London
/
7PM
Milan
/
18
UTC
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/
Fri
9AM
Tokyo
/
Fri
11AM
Sydney
/
0
UTC
Sign-­‐up:
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(2nd
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on
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12. EMBARCADERO
TECHNOLOGIES
RAD
Studio
Special
Offers
More
details
http://www.embarcadero.com/radoffer
March
31,
2015
All
expire

13. EMBARCADERO
TECHNOLOGIESEMBARCADERO
TECHNOLOGIES
Q
&
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@EmbarcaderoTech
Special
offers:
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