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MDL-65168 dml: Move preload SQL functions to self-contained class

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Andrew Nicols 2019-03-25 09:20:28 +08:00 • committed by Eloy Lafuente (stronk7)
parent e5a501de13
commit 71cbc0550f
7 changed files with 390 additions and 224 deletions
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59
lib/dml/moodle_database.php
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@ -828,65 +828,6 @@ abstract class moodle_database {
return array($sql, $params);
}
/**
* Get the SELECT SQL to preload columns for the specified fieldlist and table alias.
*
* This function is intended to be used in combination with get_preload_columns_sql and extract_from_fields.
*
* @param array $fieldlist The list of fields from get_preload_columns
* @param string $tablealias The table alias used in the FROM/JOIN field
* @return string The SQL to use in the SELECT
*/
public function get_preload_columns_sql(array $fieldlist, string $tablealias) : string {
return implode(', ', array_map(function($fieldname, $alias) use ($tablealias) {
return "{$tablealias}.{$fieldname} AS {$alias}";
}, $fieldlist, array_keys($fieldlist)));
}
/**
* Extract fields from the specified data.
* The fields are removed from the original object.
*
* This function is intended to be used in combination with get_preload_columns and get_preload_columns_sql.
*
* @param array $fieldlist The list of fields from get_preload_columns
* @param \stdClass $data The data retrieved from the database with fields to be extracted
* @return string The SQL to use in the SELECT
*/
public function extract_fields_from_object(array $fieldlist, \stdClass $data) : \stdClass {
$newdata = (object) [];
foreach ($fieldlist as $alias => $fieldname) {
if (property_exists($data, $alias)) {
$newdata->$fieldname = $data->$alias;
unset($data->$alias);
} else {
debugging("Field '{$fieldname}' not found", DEBUG_DEVELOPER);
}
}
return $newdata;
}
/**
* Get the preload columns for the specified table and use the specified prefix in the column alias.
*
* This function is intended to be used in combination with get_preload_columns_sql and extract_from_fields.
*
* @param string $table
* @param string $prefix
* @return array The list of columns in a table. The array key is the column name with an applied prefix.
*/
public function get_preload_columns(string $table, string $prefix) : array {
global $DB;
$fields = [];
foreach (array_keys($this->get_columns($table)) as $fieldname) {
$fields["{$prefix}{$fieldname}"] = $fieldname;
}
return $fields;
}
/**
* Converts short table name {tablename} to the real prefixed table name in given sql.
* @param string $sql The sql to be operated on.