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Changes for page WebObjects and Squeryl

Last modified by Ravi Mendis on 2011/04/01 11:14
From version 54.1
edited by Ravi Mendis
on 2011/03/31 23:36
Change comment: There is no comment for this version
To version 56.1
edited by Ravi Mendis
on 2011/02/27 23:20
Change comment: There is no comment for this version

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1 -= Squeryl ~= //SQL-like// DSL in Scala =
1 += Squeryl ~= //SQL-like// DSL for Scala =
2 2  
3 3  Advantages of [[Squeryl>>http://squeryl.org/]] over EOF:
4 4  
... ... @@ -7,11 +7,11 @@
7 7  ** Issues database transactions concurrently
8 8  * Scala Actor compatible
9 9  ** Immutable object model/graph
10 -** Explicit transaction control
11 -* Type Safety
10 +** Fine-grained transaction control
11 +* Strongly-typed
12 12  ** Better suited for database/business "logic".
13 13   E.g: Exploits the compiler and IDE to catch exceptions at compile time rather than at run-time.
14 -* Uses Scala Collections
14 +* Uses Scala collection classes
15 15  
16 16  = Migrating EOF -> Squeryl =
17 17  
... ... @@ -45,38 +45,3 @@
45 45  * Optional attributes (i.e those that ##allowsNull##) are typed as ##OptionT##
46 46  * To one relationships that are not mandatory (i.e optional relationships) are also typed as ##OptionT##
47 47  * To many relationships are represented as a Squeryl iterable (collection class) as opposed to a ##NSArray##.
48 -
49 -=== Use of Scala Collections ===
50 -
51 -===== 1. Filtering =====
52 -
53 -Instead of using EOQualifiers to filter EOs dynamically, you can apply the type safe filter in Scala:
54 -
55 -{{code}}
56 -
57 -def activeFiles = files.filter(_.active == true)
58 -
59 -{{/code}}
60 -
61 -===== 2. Iteration =====
62 -
63 -Functional language iteration that's become increasingly popular can be used:
64 -
65 -{{code}}
66 -
67 -activeFiles.foreach(f => {
68 - ...
69 -})
70 -
71 -{{/code}}
72 -
73 -===== 3. For-Comprehensions =====
74 -
75 -{{code}}
76 -
77 -
78 -Here's just an example use of sequence comprehension:
79 -
80 -def activeFiles = for (file <- files if file.active == true) yield f
81 -
82 -{{/code}}