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EMBARCADERO TECHNOLOGIESEMBARCADERO TECHNOLOGIES
In-‐Memory Dataset TFDMemTableJim McKeeth Lead World Wide Developer Evangelist / Engineer [email protected] @JimMcKeeth / JimMcKeeth / Delphi.org March 12th, 2015
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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!
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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.)
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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 Commonshttps://commons.wikimedia.org/wiki/File:Jeongbang_Waterfall.jpg
BinaryJSO
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XML
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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
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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++
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DEMONSTRATIONTFDMemTable
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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
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TFDMemTable Resources
• Samples – C:\Users\Public\Documents\Embarcadero\Studio\15.0\Samples\ – \Object Pascal\Database\FireDAC\Samples\Comp Layer\TFDMemTable – \Object Pascal\Database\FireDAC\Samples\Comp Layer\TFDLocalSQL
• 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
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Next Time….
• Preview: EMS Push Notifications • Sneak peak from a future release • Push notifications via EMS Server • Tuesday the 10th of March – 6AM San Francisco / 9AM New York / 1PM London / 2PM Milan / 13 UTC – 11AM San Francisco / 2PM New York / 6PM London / 7PM Milan / 18 UTC – 5PM San Francisco / Wed 9AM Tokyo / Wed 11AM Sydney / 0 UTC
Sign-‐up: http://www.embarcadero.com/landing-‐pages/skill-‐sprints
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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 – 11AM San Francisco / 2PM New York / 6PM London / 7PM Milan / 18 UTC – 5PM San Francisco / Fri 9AM Tokyo / Fri 11AM Sydney / 0 UTC
Sign-‐up: http://www.embarcadero.com/landing-‐pages/skill-‐sprints (2nd sign-‐up on the left)
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