Table of Contents
ADOdb Active Record
ADOdb Active Record is an Object Relation Mapping (ORM) implementation using PHP. In an ORM system, the tables and rows of the database are abstracted into native PHP objects. This allows the programmer to focus more on manipulating the data and less on writing SQL queries.
The ADODB Active Method library takes advantage of all the functionality of the underlying ADOdb system, from table naming and casing control, mutiple database connections to features such as recordset caching.
Thre are a couple of simple rules that aid development, especially when developing simple applications in a rapid development environment. Following these rules will avoid additional configuration requirement:
- The table and column names should be a consistent case in case sensitive environments.
- The table and column names should not include special characters or reserved words.
- The name of the table should be a plural, based on the name of class, so for example, a class name of
person, should be provided by a table name of
- The unique identifier, and primary key for the record for each table should be called
- The fields in the Active record are bound by the same restraints as the columns in the database, e.g., if a field is declared as NOT NULL in the database, it must follow the same rule in the Active Record.
ADODb Active Record is designed upon the principles of the
ActiveRecord design pattern, which was first described by Martin Fowler. The
ActiveRecord pattern has been implemented in many forms across the spectrum of programming languages.
ADODb Active Record attempts to represent the database as closely to native PHP objects as possible.
ADODb Active Record maps a database table to a PHP class, and each instance of that class represents a table row. Relations between tables can also be defined, allowing the ADODb Active Record objects to be nested.
ADOdb Active Record functions support the Record Caching functions of ADOdb.
Using ADOdb Active Record
See the tutorial
Active Record Methods
|getAttributeNames||Returns the names in an ADODb Active Record object|
|save||Updates the object to the database|
|replace||Inserts or Updates an object|
|load||Loads an object from the database|
|find||Finds an object in the database|
|set||Converts an an array to an ADODb Active Record object|
|hasMany||Deprecated General class replaced by classHasMany, tableHasMany and tableKeyHasMany|
|belongsTo||Deprecated General class replaced by classBelongsTo, tableBelongsTo and tableKeyBelongsTo|
|loadRelations||Loads a subset of data in a relationship|
|lastInsertId||Retrieves the last insert id of a database|
Static Active Record Methods
|classHasMany||Sets a one-to-many Active Record relationship|
|tableHasMany||Sets a one-to-many Active Record table relationship|
|tableKeyHasMany||Sets a one-to-many Active Record table key relationship|
|classBelongsTo||Sets the parent of a many-to-one Active Record relationship|
|tableBelongsTo||Sets the parent of a many-to-one Active Record table relationship|
|tableKeyBelongsTo||Sets the parent of a many-to-one Active Record table key relationship|
|setDatabaseAdapter||Sets the database connection for an Active Record class|
Associated Connection Methods
|getActiveRecords||Reads Active Records directly from a connection into an array|
|getActiveRecordsClass||Reads Active Records directly from a connection into objects|
|$_quoteNames||Quotes column names|
|$_table||Overrides the associated table name|
|$_dbat||Overrides the database connection|
|$_where||Sets a default where statement for load()|
|$lockMode||Applies a SELECT lock operation|
|$ADODB_ACTIVE_CACHESECS||Set to true to enable caching of metadata such as field info|
|$ACTIVE_RECORD_SAFETY||Set to false to disable safety checks. This confirms that the structure of the active record matches the structure of the associated table|
|$ADODB_ACTIVE_DEFVALS||Use default values of table definition when creating new active record.|
Author Credit: Chris Ravenscroft
Active Records Extended
This is the original one-to-many Active Record implementation. The reason we offer both versions is that the Extended version is more powerful but more complex.
To use, just include adodb-active-recordx.inc.php instead of adodb-active-record.inc.php.
It provides a new function called Find().It also supports loading all relationships using a single query (using joins).
Extended Active Record Methods
|find||finds an ADODb Active Record object in a database|