Export_(development)

Marek Skiba edited this page Dec 27, 2016 · 6 revisions
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E

The major difference from the import plugins is that there are several functions which each export some piece of the data. See one of the existing plugins for a working example.

The following is a skeleton of an export plug-in:

<?php
/* vim: set expandtab sw=4 ts=4 sts=4: */
/**
 * [Name] export plugin for phpMyAdmin
 *
 * @package    PhpMyAdmin-Export
 * @subpackage [Name]
 */
if (! defined('PHPMYADMIN')) {
    exit;
}

/**
 * Handles the export for the [Name] format
 *
 * @package PhpMyAdmin-Export
 */
class Export[Name] extends PMA\libraries\plugins\ExportPlugin
{
    /**
     * optional - declare variables and descriptions
     *
     * @var type
     */
    private $_myOptionalVariable;

    /**
     * optional - declare global variables and descriptions
     *
     * @var type
     */
    private $_globalVariableName;

    /**
     * Constructor
     */
    public function __construct()
    {
        $this->setProperties();
    }

    // optional - declare global variables and use getters later
    /**
     * Initialize the local variables that are used specific for export SQL
     *
     * @global type $global_variable_name
     * [..]
     *
     * @return void
     */
    protected function initSpecificVariables()
    {
        global $global_variable_name;
        $this->_setGlobalVariableName($global_variable_name);
    }

    /**
     * Sets the export plugin properties.
     * Called in the constructor.
     *
     * @return void
     */
    protected function setProperties()
    {
        $exportPluginProperties = new PMA\libraries\properties\plugins\ExportPluginProperties();
        $exportPluginProperties->setText('[name]');             // the name of your plug-in
        $exportPluginProperties->setExtension('[ext]');         // extension this plug-in can handle
        $exportPluginProperties->setOptionsText(__('Options'));

        // create the root group that will be the options field for
        // $exportPluginProperties
        // this will be shown as "Format specific options"
        $exportSpecificOptions = new PMA\libraries\properties\options\groups\OptionsPropertyRootGroup(
            "Format Specific Options"
        );

        // general options main group
        $generalOptions = new PMA\libraries\properties\options\groups\OptionsPropertyMainGroup(
            "general_opts"
        );

        // optional :
        // create primary items and add them to the group
        // type - one of the classes listed in libraries/properties/options/items/
        // name - form element name
        // text - description in GUI
        // size - size of text element
        // len  - maximal size of input
        // values - possible values of the item
        $leaf = new PMA\libraries\properties\options\items\RadioPropertyItem(
            "structure_or_data"
        );
        $leaf->setValues(
            array(
                'structure' => __('structure'),
                'data' => __('data'),
                'structure_and_data' => __('structure and data')
            )
        );
        $generalOptions->addProperty($leaf);

        // add the main group to the root group
        $exportSpecificOptions->addProperty($generalOptions);

        // set the options for the export plugin property item
        $exportPluginProperties->setOptions($exportSpecificOptions);
        $this->properties = $exportPluginProperties;
    }

    /**
     * Outputs export header
     *
     * @return bool Whether it succeeded
     */
    public function exportHeader ()
    {
        // implementation
        return true;
    }

    /**
     * Outputs export footer
     *
     * @return bool Whether it succeeded
     */
    public function exportFooter ()
    {
        // implementation
        return true;
    }

    /**
     * Outputs database header
     *
     * @param string $db       Database name
     * @param string $db_alias Aliases of db
     *
     * @return bool Whether it succeeded
     */
    public function exportDBHeader ($db, $db_alias = '')
    {
        // implementation
        return true;
    }

    /**
     * Outputs database footer
     *
     * @param string $db Database name
     *
     * @return bool Whether it succeeded
     */
    public function exportDBFooter ($db)
    {
        // implementation
        return true;
    }

    /**
     * Outputs CREATE DATABASE statement
     *
     * @param string $db       Database name
     * @param string $db_alias Aliases of db
     *
     * @return bool Whether it succeeded
     */
    public function exportDBCreate($db, $db_alias = '')
    {
        // implementation
        return true;
    }

    /**
     * Outputs the content of a table in [Name] format
     *
     * @param string $db        database name
     * @param string $table     table name
     * @param string $crlf      the end of line sequence
     * @param string $error_url the url to go back in case of error
     * @param string $sql_query SQL query for obtaining data
     * @param array  $aliases   Aliases of db/table/columns
     *
     * @return bool Whether it succeeded
     */
    public function exportData(
        $db, $table, $crlf, $error_url, $sql_query, $aliases = array()
    ) {
        // implementation;
        return true;
    }

    // optional - implement other methods defined in PMA\libraries\plugins\ExportPlugin.class.php:
    //  - exportRoutines()
    //  - exportStructure()
    //  - getTableDefStandIn()
    //  - getTriggers()

    // optional - implement other private methods in order to avoid
    // having huge methods or avoid duplicate code. Make use of them
    // as well as of the getters and setters declared both here
    // and in the PMA\libraries\plugins\ExportPlugin class


    // optional:
    /* ~~~~~~~~~~~~~~~~~~~~ Getters and Setters ~~~~~~~~~~~~~~~~~~~~ */


    /**
     * Getter description
     *
     * @return type
     */
    private function _getMyOptionalVariable()
    {
        return $this->_myOptionalVariable;
    }

    /**
     * Setter description
     *
     * @param type $my_optional_variable description
     *
     * @return void
     */
    private function _setMyOptionalVariable($my_optional_variable)
    {
        $this->_myOptionalVariable = $my_optional_variable;
    }

    /**
     * Getter description
     *
     * @return type
     */
    private function _getGlobalVariableName()
    {
        return $this->_globalVariableName;
    }

    /**
     * Setter description
     *
     * @param type $global_variable_name description
     *
     * @return void
     */
    private function _setGlobalVariableName($global_variable_name)
    {
        $this->_globalVariableName = $global_variable_name;
    }
}
?>

Use the PMA_exportOutputHandler function to export data in each stage.