Finds all tables that are like the specified base table name. This is a backport of the change made to findTables in Drupal 8 to work with virtual, un-prefixed table names. The original function is retained for Backwards Compatibility.

Parameters

string $table_expression: An SQL expression, for example "cache_%" (without the quotes).

Return value

array Both the keys and the values are the matching tables.

See also

https://www.drupal.org/node/2552435

1 method overrides DatabaseSchema::findTablesD8()

DatabaseSchema_sqlite::findTablesD8 in includes/database/sqlite/schema.inc

Finds all tables that are like the specified base table name. This is a backport of the change made to findTables in Drupal 8 to work with virtual, un-prefixed table names. The original function is retained for Backwards Compatibility.

File

includes/database/schema.inc, line 367

Class

DatabaseSchema

Base class for database schema definitions.

Code

public function findTablesD8($table_expression) {
 // Load all the tables up front in order to take into account per-table
 // prefixes. The actual matching is done at the bottom of the method.
 $condition = $this->buildTableNameCondition ('%', 'LIKE');
 $condition->compile ($this->connection , $this);
 $individually_prefixed_tables = $this->connection 
 ->getUnprefixedTablesMap ();
 $default_prefix = $this->connection 
 ->tablePrefix ();
 $default_prefix_length = strlen ($default_prefix);
 $tables = array();
 // Normally, we would heartily discourage the use of string
 // concatenation for conditionals like this however, we
 // couldn't use db_select() here because it would prefix
 // information_schema.tables and the query would fail.
 // Don't use {} around information_schema.tables table.
 $results = $this->connection 
 ->query ("SELECT table_name AS table_name FROM information_schema.tables WHERE " . (string) $condition, $condition->arguments ());
 foreach ($results as $table) {
 // Take into account tables that have an individual prefix.
 if (isset($individually_prefixed_tables[$table->table_name])) {
 $prefix_length = strlen ($this->connection 
 ->tablePrefix ($individually_prefixed_tables[$table->table_name]));
 }
 elseif ($default_prefix && substr ($table->table_name, 0, $default_prefix_length) !== $default_prefix) {
 // This table name does not start the default prefix, which means that
 // it is not managed by Drupal so it should be excluded from the result.
 continue;
 }
 else {
 $prefix_length = $default_prefix_length;
 }
 // Remove the prefix from the returned tables.
 $unprefixed_table_name = substr ($table->table_name, $prefix_length);
 // The pattern can match a table which is the same as the prefix. That
 // will become an empty string when we remove the prefix, which will
 // probably surprise the caller, besides not being a prefixed table. So
 // remove it.
 if (!empty($unprefixed_table_name)) {
 $tables[$unprefixed_table_name] = $unprefixed_table_name;
 }
 }
 // Convert the table expression from its SQL LIKE syntax to a regular
 // expression and escape the delimiter that will be used for matching.
 $table_expression = str_replace (array(
 '%',
 '_',
 ), array(
 '.*?',
 '.',
 ), preg_quote ($table_expression, '/'));
 $tables = preg_grep ('/^' . $table_expression . '$/i', $tables);
 return $tables;
}

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