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<?php declare(strict_types=1); namespace Doctrine\DBAL\Schema\ForeignKeyConstraint; /** * Represents the foreign key constraint's referential action. * * @link https://www.contrib.andrew.cmu.edu/~shadow/sql/sql1992.txt SQL-92, Subclause 11.8, "<referential action>" * @link https://dev.mysql.com/doc/refman/8.4/en/constraint-foreign-key.html * @link https://www.postgresql.org/docs/current/sql-createtable.html#SQL-CREATETABLE-PARMS-REFERENCES * @link https://learn.microsoft.com/en-us/sql/relational-databases/tables/primary-and-foreign-key-constraints#cascading-referential-integrity * @link https://docs.oracle.com/en/database/oracle/oracle-database/21/sqlrf/constraint.html * @link https://www.ibm.com/docs/en/db2/11.5?topic=constraints-foreign-key-referential * @link https://www.sqlite.org/foreignkeys.html */ enum ReferentialAction: string { case CASCADE = 'CASCADE'; case NO_ACTION = 'NO ACTION'; case SET_DEFAULT = 'SET DEFAULT'; case SET_NULL = 'SET NULL'; /** * The <code>RESTRICT</code> referential action is not part of the SQL-92 standard but is supported by MySQL, * PostgreSQL, IBM DB2 and SQLite. */ case RESTRICT = 'RESTRICT'; /** * Returns the SQL representation of the referential action. */ public function toSQL(): string { return $this->value; } }
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