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author | ctrlaltca@gmail.com <> | 2011-05-22 14:43:11 +0000 |
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committer | ctrlaltca@gmail.com <> | 2011-05-22 14:43:11 +0000 |
commit | 8aa27c48cd1b620e3a7dee1e2de2cdc67f4e9874 (patch) | |
tree | 005e4f8f6b698acfc6f16a36fc873c0ef9b4842f /demos/quickstart/protected/pages/Database/ActiveRecord.page | |
parent | 948a32434d4e72765dd26c803e94129b5c2f7769 (diff) |
branch 3.1: misc doc updates
Diffstat (limited to 'demos/quickstart/protected/pages/Database/ActiveRecord.page')
-rw-r--r-- | demos/quickstart/protected/pages/Database/ActiveRecord.page | 20 |
1 files changed, 10 insertions, 10 deletions
diff --git a/demos/quickstart/protected/pages/Database/ActiveRecord.page b/demos/quickstart/protected/pages/Database/ActiveRecord.page index bc0df529..78947faf 100644 --- a/demos/quickstart/protected/pages/Database/ActiveRecord.page +++ b/demos/quickstart/protected/pages/Database/ActiveRecord.page @@ -50,16 +50,16 @@ <li>Fetch relationships (related foreign objects) such as "has many", "has one", "belongs to" and "many to many" via association table.</li> <li>Lazy loading of relationships.</li> </ul> -<h2>Design Implications</h2> -<p> +<h2 id="144005">Design Implications</h2> +<p id="720009" class="block-content"> Prado's implementation of Active Record does not maintain referential identity. Each object obtained using Active Record is a copy of the data in the database. For example, If you ask for a particular customer and get back a <tt>Customer</tt> object, the next time you ask for that customer you get back another instance of a <tt>Customer</tt> object. This implies that a strict comparison (i.e., using <tt>===</tt>) will return false, while loose comparison (i.e., using <tt>==</tt>) will return true if the object values are equal by loose comparison. -<p> -<p> +<p id="720010" class="block-content"> +<p id="720011" class="block-content"> This is design implication related to the following question. <i>"Do you think of the customer as an object, of which there's only one, or do you think of the objects you operate on as <b>copies</b> of the database?"</i> @@ -876,8 +876,8 @@ class Category extends TActiveRecord } </com:TTextHighlighter> -<h3>Query Criteria for Related Objects</h3> -<p> +<h3 id="144007">Query Criteria for Related Objects</h3> +<p id="720012" class="block-content"> In the above, we show that an Active Record object can reference to its related objects by declaring a static class member $RELATIONS which specifies a list of relations. Each relation is specified as an array consisting of three elements: relation type, related AR class name, @@ -1147,14 +1147,14 @@ arrays. E.g. <tt>$player->skills[] = new SkillRecord()</tt>. If <tt>array</tt> w will be thrown. </p> -<h2>Column Mapping</h2> -<p> +<h2 id="144006">Column Mapping</h2> +<p id="720013" class="block-content"> Since v3.1.1, Active Record starts to support column mapping. Column mapping allows developers to address columns in Active Record using a more consistent naming convention. In particular, using column mapping, one can access a column using whatever name he likes, rather than limited by the name defined in the database schema. </p> -<p> +<p id="720014" class="block-content"> To use column mapping, declare a static array named <tt>COLUMN_MAPPING</tt> in the Active Record class. The keys of the array are column names (called <i>physical column names</i>) as defined in the database schema, while the values are corresponding property names (called <i>logical column names</i>) defined @@ -1181,7 +1181,7 @@ class UserRecord extends TActiveRecord //.... } </com:TTextHighlighter> -<p> +<p id="720015" class="block-content"> With the above column mapping, we can address <tt>first_name</tt> using <tt>$userRecord->firstName</tt> instead of <tt>$userRecord->first_name</tt>. This helps separation of logic and model. </p> |