Advanced Usage
Advanced Usage – Advance usage of MDB2_TableBrowser
Full example use the MDB2_TableBrowser API
The example source below contains all the different methods available to tableBrowser object beyond the features explained in the basic usage documentation.
<?php
require_once "MDB2.php";
define('DSN', 'mysql://username:pass@localhost/animal_db');
/**
* The example below relies on the following data from the table tbl_animals
* ID NAME TYPE LIFESPAN
* 1 dog mammal 12
* 2 cat mammal 30
* 3 parrot bird 60
* 4 shark fish 30
* 5 dolphin mammal 50
* 6 crocodile reptile 50
* 7 snake reptile 20
* 8 spider arachnid 1
* 9 housefly insect 1
* 10 ostrich bird 35
* 11 bat mammal 6
* 12 human mammal 100
*/
$dsn = 'mysql://username:pass@localhost/animal_db';
$options = array(
'debug' => 2,
'result_buffering' => false,
);
$mdb2 = MDB2::singleton($dsn, $options);
//Create the table
setupDb($mdb2);
$mdb2->loadModule('TableBrowser');
//Create a table browser for the tbl_animals table, and specify id as the primary key
$browser = $mdb2->tableBrowserFactory('tbl_animals', 'id');
//The data browsing object is now ready
//First insert the needed data
$data = array(
array(1,'dog','mammal',12),
array(2,'cat','mammal',30),
array(3,'parrot','bird',60),
array(4,'shark','fish',30),
array(5,'dolphin','mammal',50),
array(6,'crocodile','reptile',50),
array(7,'snake','reptile',20),
array(8,'spider','arachnid',1),
array(9,'housefly','insect',1),
array(10,'ostrich','bird',35),
array(11,'bat','mammal',6),
array(12,'human','mammal',100)
);
$browser->insertRows(array('id', 'name','type','lifespan'), $data);
//Get info on a single animal, getRow returns a hash array and getRows returns
//an MDB2_Result object
$browser->getRow(1);
print "\n" . $browser->getLastSQL();
//Prints: SELECT `ID`,`NAME`,`TYPE`,`LIFESPAN` FROM tbl_animals WHERE (`id` = 1)
//Get info on 3 animals in the table sorted by name starting with the 5th animal
$browser->getRows('name', 3, 5);
print "\n" . $browser->getLastSQL();
//The limits/offsets are not shown below as they are set by mdb2 library
//Prints: SELECT `ID`,`NAME`,`TYPE`,`LIFESPAN` FROM tbl_animals
//Hide the ID column and rename the column "TYPE" to "Animal Type"
$browser->selectColumns(array('name','type','lifespan'));
$browser->setColumnAlias('TYPE', 'ANIMAL TYPE');
$browser->getRows('name', 3, 5);
print "\n" . $browser->getLastSQL();
//Prints:SELECT `NAME`,`TYPE` AS `ANIMAL TYPE`,`LIFESPAN` FROM tbl_animals
//Get the different kinds of animal types in the table eg: mammal, reptile,...
$browser->getColumnValues('type');
print "\n" . $browser->getLastSQL();
//Prints:SELECT DISTINCT `TYPE` FROM tbl_animals
//This also works with aliases you have set up
$browser->getColumnValues('ANIMAL TYPE');
print "\n" . $browser->getLastSQL();
//Prints:SELECT DISTINCT `TYPE` FROM tbl_animals
/*
* Example using filters, look for mammals with a lifespan <60 years Multiple
* filters can be added and removed. This functionality can be used to quickly
* build a browsing application that gives the user the freedom to traverse the
* table data in different ways.
*/
$browser->addFilter('MaxAge', 'lifespan', '<=', 60);
$browser->addFilter('AnimalType', 'type', '=', 'mammal');
//Once a filter has been set, it affects the browser's output
$browser->getRows();
print "\n" . $browser->getLastSQL();
//Prints: SELECT `NAME`,`TYPE` AS `ANIMAL TYPE`,`LIFESPAN` FROM tbl_animals WHERE (`lifespan` <= 60 AND `type` = 'mammal')
//A single filter can be removed by specifying the filter name
$browser->removeFilter('MaxAge');
$browser->getRows();
print "\n" . $browser->getLastSQL();
//Prints: SELECT `NAME`,`TYPE` AS `ANIMAL TYPE`,`LIFESPAN` FROM tbl_animals WHERE (`type` = 'mammal')
//All Filters set can be cleared using this method
$browser->resetFilters();
$browser->getRows();
print "\n" . $browser->getLastSQL();
//Prints: SELECT `NAME`,`TYPE` AS `ANIMAL TYPE`,`LIFESPAN` FROM tbl_animals
//Insert a new row
$rowData = array('id'=>13, 'name' => 'duck','type' => 'bird','lifespan' => 5);
$browser->insertRow($rowData);
print "\n" . $browser->getLastSQL();
//The whole statement is not shown as this sql is prepared and excectues by mdb2 library
//Prints: INSERT INTO tbl_animals VALUES (?,?,?,?)
//Update the parrot's data
$rowData = $browser->getRow(3);
$rowData['lifespan'] = 65;
$browser->updateRow(3, $rowData);
print "\n" . $browser->getLastSQL();
//Prints: UPDATE tbl_animals SET `id`= NULL,`name`= 'parrot',`type`= NULL,`lifespan`= 65 WHERE (`id` = 3)
$browser->addFilter('AnimalType', 'type', '=', 'bird');
//Clear all colum selections and aliases
$browser->resetSelectColumns();
$browser->resetColumAliases();
$browser->getRows();
print "\n" . $browser->getLastSQL();
//Prints: SELECT `ID`,`NAME`,`TYPE`,`LIFESPAN` FROM tbl_animals WHERE (`type` = 'bird')
/**
* You can also create multiple filter chains to query for different conditions
* in parallel. Say you were interested in mammals with a lifespan > 30 or birds
* with a lifespan < 10. This can be accomplished using 2 filter chains as
* follows.
*/
$browser->resetFilters();
//Call the first chain 'Mammal Group' and the second "Bird Group'. You can use any identifier that makes sense to you
$browser->createFilterChain('Mammal Group');
$browser->createFilterChain('Bird Group');
//Define the mammals filter chain
$browser->selectFilterChain('Mammal Group');
$browser->addFilter('AnimalType', 'type', '=', 'mammal', 'Mammal Group');
$browser->addFilter('Lifespan', 'lifespan', '>', 30, 'Mammal Group');
//Define the birds filter chain
$browser->selectFilterChain('Bird Group');
$browser->addFilter('AnimalType', 'type', '=', 'bird', 'Bird Group');
$browser->addFilter('Lifespan', 'lifespan', '<', 10, 'Bird Group');
$browser->getRows();
print "\n" . $browser->getLastSQL();
//Prints: SELECT `ID`,`NAME`,`TYPE`,`LIFESPAN` FROM tbl_animals WHERE ((`type` = 'mammal' AND `lifespan` > 30)) OR ((`type` = 'bird' AND `lifespan` < 10))
//This resets all the filters chains
$browser->resetAllFilters();
//Switch back to the default filter chain
$browser->selectFilterChain();
//You can delete a filterChain like this. Any user defined filter chain can be removed
//But the default filter chain is always there
$browser->deleteFilterChain('Mammal Group');
$browser->deleteFilterChain('Bird Group');
//You can add custom columns as well for columns like 'md5()' or your own custom functions
$browser->addCustomColumn('md5(TYPE)', 'Special Column');
$browser->getRows();
print "\n" . $browser->getLastSQL();
//Prints: SELECT `id`,`name`,`type`,`lifespan`,md5(TYPE) AS `Special Column` FROM tbl_animals
$browser->removeCustomColumn('md5(TYPE)');
//You can also add grouping and sorting methods
$browser->setOrderBy('lifespan');
$browser->setGroupBy('type');
$browser->selectColumns(array('type','lifespan'));
$browser->addCustomColumn('count(*)', 'Number of Species');
$browser->getRows();
print "\n" . $browser->getLastSQL();
//Prints: SELECT `type`,`lifespan`,count(*) AS `Number of Species` FROM tbl_animals GROUP BY `type` ORDER BY `lifespan`
//Delete sharks (id 4)
$browser->deleteRow(4);
print "\n" . $browser->getLastSQL() . "\n\n";
//Prints: DELETE FROM tbl_animals WHERE (`id` = 4)
/**
* Creates the tbl_animals table
*
* @param ref &$mdb2 An mdb2 object reference
*
* @return void
*/
function setupDb(&$mdb2)
{
// loading the Manager module
$mdb2->loadModule('Manager');
$tableDefinition = array (
'id' => array (
'type' => 'integer',
'unsigned' => 1,
'notnull' => 1,
'default' => 0,
),
'name' => array (
'type' => 'text',
'length' => 300,
'notnull' => 1
),
'type' => array (
'type' => 'text',
'length' => 300,
'notnull' => 1
),
'lifespan' => array (
'type' => 'integer',
'unsigned' => 1,
'notnull' => 1,
'default' => 0,
),
);
$tableConstraints = array (
'primary' => true,
'fields' => array (
'id' => array()
)
);
$mdb2->dropTable('tbl_animals');
$mdb2->createTable('tbl_animals', $tableDefinition);
$mdb2->createConstraint('tbl_animals', 'primary_key', $tableConstraints);
$mdb2->createSequence('primary_key');
}
?>
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