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<?php |
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namespace Jet_Form_Builder\Db_Queries; |
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// If this file is called directly, abort. |
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if ( ! defined( 'WPINC' ) ) { |
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die; |
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} |
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|
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class Base_Db_Constraint { |
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|
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const ACTION_CASCADE = 'CASCADE'; |
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const ACTION_SET_DEFAULT = 'SET DEFAULT'; |
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const ACTION_SET_NULL = 'SET NULL'; |
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const ACTION_RESTRICT = 'RESTRICT'; |
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|
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protected $foreign_keys; |
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protected $foreign_table; |
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|
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/** @var Base_Db_Model */ |
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protected $parent_model; |
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protected $parent_keys = array( 'id' ); |
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|
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protected $actions = array(); |
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|
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/** |
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* Here we can check the engine of the table, |
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* if it is not InnoDB - throw \Jet_Form_Builder\Db_Queries\Exceptions\Skip_Exception |
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*/ |
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public function before_create() { |
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} |
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|
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/** |
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* @param array $keys |
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* |
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* @return $this |
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*/ |
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public function set_foreign_keys( array $keys ): Base_Db_Constraint { |
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$this->foreign_keys = $keys; |
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|
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return $this; |
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} |
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|
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/** |
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* @param string $table |
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* |
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* @return $this |
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*/ |
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public function set_foreign_table( string $table ): Base_Db_Constraint { |
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$this->foreign_table = $table; |
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|
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return $this; |
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} |
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|
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public function set_model( Base_Db_Model $model ): Base_Db_Constraint { |
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$this->parent_model = $model; |
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|
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return $this; |
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} |
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|
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public function get_model(): Base_Db_Model { |
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return $this->parent_model; |
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} |
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|
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public function get_table(): string { |
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return $this->parent_model::table(); |
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} |
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|
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public function get_table_name(): string { |
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return $this->parent_model::table_name(); |
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} |
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|
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public function set_parent_keys( array $keys ): Base_Db_Constraint { |
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$this->parent_keys = $keys; |
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|
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return $this; |
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} |
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|
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public function on_delete( string $action ): Base_Db_Constraint { |
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return $this->set_action( 'DELETE', $action ); |
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} |
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|
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public function on_update( string $action ): Base_Db_Constraint { |
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return $this->set_action( 'UPDATE', $action ); |
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} |
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|
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/** |
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* @param string $name |
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* @param string $action |
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* |
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* @return $this |
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*/ |
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public function set_action( string $name, string $action ): Base_Db_Constraint { |
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$this->actions[ $name ] = $action; |
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|
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return $this; |
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} |
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|
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public function get_name(): string { |
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$raw_name = "{$this->get_table_name()}__" . implode( '_', $this->foreign_keys ) . "__{$this->foreign_table}"; |
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|
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/** |
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* https://dev.mysql.com/doc/refman/5.6/en/identifier-length.html |
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*/ |
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$length_excess = strlen( $raw_name ) - 64; |
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|
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if ( $length_excess < 0 ) { |
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return $raw_name; |
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} |
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|
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// cut the string |
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return substr( $raw_name, 0, -$length_excess ); |
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} |
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|
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final public function build_part(): string { |
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$constraint = 'FOREIGN KEY (`' . implode( '` , `', $this->foreign_keys ) . '`) '; |
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$constraint .= "REFERENCES {$this->get_table()}(`" . implode( '` , `', $this->parent_keys ) . '`)'; |
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|
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foreach ( $this->actions as $name => $action ) { |
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$constraint .= " ON {$name} {$action}"; |
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} |
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return $constraint; |
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} |
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final public function build(): string { |
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return "CONSTRAINT {$this->get_name()} {$this->build_part()}"; |
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} |
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|
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} |
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