Yiisoft\Db\Mysql\Schema::findConstraints()

Complexity

Conditions	9
Paths	43

Size

Total Lines	65
Code Lines	46

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	13
CRAP Score	21.4523

Importance

Changes	1
Bugs	0	Features	0

<?php
    protected function findConstraints($table)
    {
        $sql = <<<'SQL'
SELECT
    `kcu`.`CONSTRAINT_NAME` AS `constraint_name`,
    `kcu`.`COLUMN_NAME` AS `column_name`,
    `kcu`.`REFERENCED_TABLE_NAME` AS `referenced_table_name`,
    `kcu`.`REFERENCED_COLUMN_NAME` AS `referenced_column_name`
FROM `information_schema`.`REFERENTIAL_CONSTRAINTS` AS `rc`
JOIN `information_schema`.`KEY_COLUMN_USAGE` AS `kcu` ON
    (
        `kcu`.`CONSTRAINT_CATALOG` = `rc`.`CONSTRAINT_CATALOG` OR
        (`kcu`.`CONSTRAINT_CATALOG` IS NULL AND `rc`.`CONSTRAINT_CATALOG` IS NULL)
    ) AND
    `kcu`.`CONSTRAINT_SCHEMA` = `rc`.`CONSTRAINT_SCHEMA` AND
    `kcu`.`CONSTRAINT_NAME` = `rc`.`CONSTRAINT_NAME`
WHERE `rc`.`CONSTRAINT_SCHEMA` = database() AND `kcu`.`TABLE_SCHEMA` = database()
AND `rc`.`TABLE_NAME` = :tableName AND `kcu`.`TABLE_NAME` = :tableName1
SQL;

        try {
            $rows = $this->getDb()->createCommand(
                $sql,
                [':tableName' => $table->getName(), ':tableName1' => $table->getName()]
            )->queryAll();

            $constraints = [];

            foreach ($rows as $row) {
                $constraints[$row['constraint_name']]['referenced_table_name'] = $row['referenced_table_name'];
                $constraints[$row['constraint_name']]['columns'][$row['column_name']] = $row['referenced_column_name'];
            }

            $table->foreignKeys([]);

            foreach ($constraints as $name => $constraint) {
                $table->foreignKey($name, array_merge(
                    [$constraint['referenced_table_name']],
                    $constraint['columns']
                ));
            }
        } catch (Exception $e) {
            $previous = $e->getPrevious();

            if (!$previous instanceof PDOException || strpos($previous->getMessage(), 'SQLSTATE[42S02') === false) {
                throw $e;
            }

            // table does not exist, try to determine the foreign keys using the table creation sql
            $sql = $this->getCreateTableSql($table);
            $regexp = '/FOREIGN KEY\s+\(([^\)]+)\)\s+REFERENCES\s+([^\(^\s]+)\s*\(([^\)]+)\)/mi';

            if (preg_match_all($regexp, $sql, $matches, PREG_SET_ORDER)) {
                foreach ($matches as $match) {
                    $fks = array_map('trim', explode(',', str_replace('`', '', $match[1])));
                    $pks = array_map('trim', explode(',', str_replace('`', '', $match[3])));
                    $constraint = [str_replace('`', '', $match[2])];

                    foreach ($fks as $k => $name) {
                        $constraint[$name] = $pks[$k];
                    }

                    $table->foreignKey(\md5(\serialize($constraint)), $constraint);
                }
                $table->foreignKeys(array_values($table->getForeignKeys()));
            }