02 - Beginning Code First.pptx

7/24/2019 02 - Beginning Code First.pptx

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02 | Beginning Code First

Adam Tuliper | Technical Evangelist

Christopher Harrison | Content Developer


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Simple Code First

Creating classes

Creating Data Context

nitiali!ing the data"ase

Code First


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Click toMaster style

Simple Code First


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publicclassArtist{ publicintArtistID { get;set; }

publicstringName { get; s} publicstringBio { get;set; }

}


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Code #rst classes$

are %ust classes


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Code #rst class design tips

&ust design 'our classes the (a' 'ou t'pica )*or the most part+

,se "est practices D *or the D

-ou can still control the data"ase Attri"utes Fluent A.


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Creating classes


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But (hat a"out m' data"ase/

Code First o*ten does the right thing

But it does need a little guidance

For example strings "ecome nvarchar)max


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Basic data"ase control

Data annotations can "e used to provide ad

context S'stem1Componentodel1DataAnnotations https344msdn1microso*t1com4en5us4li"rar'4s'stem

ntmodel1dataannotations)v6vs1770+1aspx

8ot speci#c to Entit' Frame(or9 ,sed "' several other plat*orms including :C
https://msdn.microsoft.com/en-us/library/system.componentmodel.dataannotations(v=vs.110).aspxhttps://msdn.microsoft.com/en-us/library/system.componentmodel.dataannotations(v=vs.110).aspxhttps://msdn.microsoft.com/en-us/library/system.componentmodel.dataannotations(v=vs.110).aspxhttps://msdn.microsoft.com/en-us/library/system.componentmodel.dataannotations(v=vs.110).aspxhttps://msdn.microsoft.com/en-us/library/system.componentmodel.dataannotations(v=vs.110).aspxhttps://msdn.microsoft.com/en-us/library/system.componentmodel.dataannotations(v=vs.110).aspx


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Code First conventions

Ta"les are automaticall' plurali!ed

Ta"les are created in the d"o schema

D propert' is created as the primar' 9e' dentit' or auto5count column


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Ta"le creation

Ta"leAttri"ute

Schema 8ame

ColumnAttri"ute 8ame


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Strings

8ulla"le nvarchar)max+ is the de*ault

Attri"utes String;engthAttri"ute

aximum;ength

inimum;ength


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8um"ers

S>; data t'pe is mapped to 18ET data t'pe

long "ecomes Bignt


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8um"ers and nulla"ilit'

8um"ers are value t'pes in 18ET

18ET propert' must "e mar9ed as nulla"le 8ulla"le?T@ t'pe/


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DEAttri"utes and data"ase control


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Creating the Data Context


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Creating the Data Context

&ust li9e creating a normal class

ts li9e its called Code First

publicclassMusicStoreDbContext: DbC

{ publicDbSet Artists { get;

}


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DECreating the D"Context


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The Find)+ method


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DECreating a repositor'


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nitiali!ing the data"ase


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Testing re=uires a 9no(n starting

Entit' Frame(or9 provides data"ase initiali!

create that state

Create a class that inherits *rom the appropoption CreateData"ase*8otExists DropCreateData"asehenodelChanges DropCreateData"aseAl(a's

verride the Seed method to create data"a

content


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DEnitiali!ing the data"ase


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207 icroso*t Corporation1 All rights reserved1 icroso*t indo(s ce A!ure S'stem Center D'namics and other product names atrademar9s and4or trademar9s in the ,1S1 and4or other countries1 The in*ormation herein is *or in*ormational purposes onl' and representicroso*t Corporation as o* the date o* this presentation1 Because icroso*t must respond to changing mar9et conditions it should not "e

commitment on the part o* icroso*t and icroso*t cannot guarantee the accurac' o* an' in*ormation provided a*ter the date o* this presAGES 8 A

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02 - Beginning Code First.pptx