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MDL-50439 tool_lp: Select multiple persistents from query

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This commit is contained in:
Frederic Massart 2016-01-22 16:42:10 +08:00
parent 97244310c2
commit 17e1abb5b3
1 changed files with 60 additions and 1 deletions
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61
admin/tool/lp/classes/persistent.php
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@ -192,7 +192,7 @@ abstract class persistent {
// List of reserved property names. Mostly because we have methods (getters/setters) which would confict with them.
// Think about backwards compability before adding new ones here!
$reserved = array('errors', 'formatted_properties', 'records', 'records_select', 'property_default_value',
'property_error_message');
'property_error_message', 'sql_fields');
foreach ($def as $property => $definition) {
@ -657,6 +657,35 @@ abstract class persistent {
return $this->errors;
}
/**
* Extract a record from a row of data.
*
* Most likely used in combination with {@see self::get_sql_fields()}. This method is
* simple enough to be used by non-persistent classes, keep that in mind when modifying it.
*
* e.g. persistent::extract_record($row, 'user'); should work.
*
* @param stdClass $row The row of data.
* @param string $prefix The prefix the data fields are prefixed with, defaults to the table name followed by underscore.
* @return stdClass The extracted data.
*/
public static function extract_record($row, $prefix = null) {
if ($prefix === null) {
$prefix = static::TABLE . '_';
}
$prefixlength = strlen($prefix);
$data = new stdClass();
foreach ($row as $property => $value) {
if (strpos($property, $prefix) === 0) {
$propertyname = substr($property, $prefixlength);
$data->$propertyname = $value;
}
}
return $data;
}
/**
* Load a list of records.
*
@ -725,6 +754,36 @@ abstract class persistent {
}
/**
* Return the list of fields for use in a SELECT clause.
*
* Having the complete list of fields prefixed allows for multiple persistents to be fetched
* in a single query. Use {@see self::extract_record()} to extract the records from the query result.
*
* @param string $alias The alias used for the table.
* @param string $prefix The prefix to use for each field, defaults to the table name followed by underscore.
* @return string The SQL fragment.
*/
public static function get_sql_fields($alias, $prefix = null) {
$fields = array();
if ($prefix === null) {
$prefix = static::TABLE . '_';
}
// Get the properties and move ID to the top.
$properties = static::properties_definition();
$id = $properties['id'];
unset($properties['id']);
$properties = array('id' => $id) + $properties;
foreach ($properties as $property => $definition) {
$fields[] = $alias . '.' . $property . ' AS ' . $prefix . $property;
}
return implode(', ', $fields);
}
/**
* Count a list of records.
*