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<?php
/**
* The Gravity Forms Query Call class.
*/
class GF_Query_Call {
/**
* @var string The function name.
*/
private $_function_name = null;
/**
* @var array The parameters.
*/
private $_parameters = array();
/**
* A function call.
*
* @param string $function_name The function to call.
* @param array $parameters The function parameters. Default: []
*/
public function __construct( $function_name, $parameters = array() ) {
$this->_function_name = $function_name;
$this->_parameters = $parameters;
}
/**
* Generate the SQL.
*
* The default behavior is to just plop function_name( implode( ', ', $parameters ) ).
* For other cases, like CAST, check the derived classes.
*
* @param GF_Query $query The query.
*
* @return string The generated SQL.
*/
public function sql( $query ) {
if ( method_exists( $this, strtolower( $this->function_name ) . '_sql' ) ) {
return call_user_func( array( $this, strtolower( $this->function_name ) . '_sql' ), $query );
}
return sprintf( "{$this->function_name}(%s)", implode( ', ', $this->parameters ) );
}
/**
* A cast call.
*
* @param GF_Query_Column $column The column to cast.
* @param string $type The type to cast to.
*
* @return GF_Query_Call|null instance or null.
*/
public static function CAST( $column, $type ) {
if ( ! $column instanceof GF_Query_Column ) {
return null;
}
return new self( 'CAST', array( $column, $type ) );
}
/**
* A RAND call.
*
* @return GF_Query_Call|null instance or null.
*/
public static function RAND( ) {
return new self( 'RAND' );
}
/**
* Generate the RAND call SQL.
*
* @return string The generated SQL.
*/
private function rand_sql() {
return 'RAND()';
}
/**
* Generate the CAST call SQL.
*
* @param GF_Query $query The query.
*
* @return string The generated SQL.
*/
private function cast_sql( $query ) {
if ( ! $this->parameters || count( $this->parameters ) != 2 ) {
return '';
}
list( $column, $type ) = $this->parameters;
if ( ! in_array( $type, array( GF_Query::TYPE_SIGNED, GF_Query::TYPE_UNSIGNED, GF_Query::TYPE_DECIMAL ) ) ) {
return '';
}
if ( ! $column->field_id || ! $column->source ) {
return '';
}
if ( GF_Query::TYPE_DECIMAL === $type ) {
$type = 'DECIMAL(65, 6)'; // @todo make the decimal point configurable one day
}
$id = $column->is_entry_column() ? $column->field_id : 'meta_value';
return sprintf( 'CAST(`%s`.`%s` AS %s)', $query->_alias( $column->field_id, $column->source, 'c' ), $id, $type );
}
/**
* Retrieve all the columns from the parameters of this call.
*
* @return array The columns.
*/
private function get_columns() {
$columns = array();
foreach ( $this->parameters as $p ) {
if ( $p instanceof GF_Query_Column ) {
$columns[] = $p;
}
}
return $columns;
}
/**
* Proxy read-only values.
*/
public function __get( $key ) {
switch ( $key ):
case 'parameters':
return $this->_parameters;
case 'function_name':
return $this->_function_name;
case 'columns':
return $this->get_columns();
endswitch;
}
}
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