Memory usage and execution improvements in wpdb. Store and work with resources directly, rather than full copies of results. Plugins which incorrectly used wpdb->last_result (a private property) will need to shift to wpdb->get_results() with no \$query. Magic getter is introduced for back compat when using PHP5. props joelhardi, fixes #12257.
git-svn-id: http://svn.automattic.com/wordpress/trunk@16320 1a063a9b-81f0-0310-95a4-ce76da25c4cd
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nacin
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@ -125,13 +125,13 @@ class wpdb {
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var $last_query;
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/**
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* Results of the last query made
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* MySQL result resource of the last query made
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*
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* @since 1.0.0
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* @since 3.1.0
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* @access private
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* @var array|null
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* @var resource|null
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*/
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var $last_result;
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var $_mysql_last_result;
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/**
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* Saved info on the table column
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@ -1015,7 +1015,7 @@ class wpdb {
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* @return void
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*/
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function flush() {
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$this->last_result = array();
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@mysql_free_result( $this->_mysql_last_result );
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$this->col_info = null;
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$this->last_query = null;
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}
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@ -1085,7 +1085,7 @@ class wpdb {
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if ( defined( 'SAVEQUERIES' ) && SAVEQUERIES )
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$this->timer_start();
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$this->result = @mysql_query( $query, $this->dbh );
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$this->_mysql_last_result = @mysql_query( $query, $this->dbh );
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$this->num_queries++;
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if ( defined( 'SAVEQUERIES' ) && SAVEQUERIES )
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@ -1107,22 +1107,15 @@ class wpdb {
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$return_val = $this->rows_affected;
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} else {
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$i = 0;
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while ( $i < @mysql_num_fields( $this->result ) ) {
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$this->col_info[$i] = @mysql_fetch_field( $this->result );
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while ( $i < @mysql_num_fields( $this->_mysql_last_result ) ) {
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$this->col_info[$i] = @mysql_fetch_field( $this->_mysql_last_result );
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$i++;
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}
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$num_rows = 0;
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while ( $row = @mysql_fetch_object( $this->result ) ) {
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$this->last_result[$num_rows] = $row;
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$num_rows++;
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}
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@mysql_free_result( $this->result );
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// Log number of rows the query returned
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// and return number of rows selected
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$this->num_rows = $num_rows;
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$return_val = $num_rows;
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$this->num_rows = @mysql_num_rows( $this->_mysql_last_result );
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$return_val = $this->num_rows;
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}
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return $return_val;
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@ -1281,9 +1274,10 @@ class wpdb {
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if ( $query )
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$this->query( $query );
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// Extract var out of cached results based x,y vals
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if ( !empty( $this->last_result[$y] ) ) {
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$values = array_values( get_object_vars( $this->last_result[$y] ) );
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// Extract var from result resource based x,y vals
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if ( $this->num_rows > $y ) {
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@mysql_data_seek( $this->_mysql_last_result, $y );
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$values = @mysql_fetch_row( $this->_mysql_last_result );
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}
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// If there is a value return it else return null
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@ -1310,15 +1304,17 @@ class wpdb {
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else
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return null;
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if ( !isset( $this->last_result[$y] ) )
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if ( $this->num_rows <= $y )
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return null;
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@mysql_data_seek( $this->_mysql_last_result, $y );
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if ( $output == OBJECT ) {
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return $this->last_result[$y] ? $this->last_result[$y] : null;
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return @mysql_fetch_object( $this->_mysql_last_result );
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} elseif ( $output == ARRAY_A ) {
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return $this->last_result[$y] ? get_object_vars( $this->last_result[$y] ) : null;
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return @mysql_fetch_assoc( $this->_mysql_last_result );
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} elseif ( $output == ARRAY_N ) {
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return $this->last_result[$y] ? array_values( get_object_vars( $this->last_result[$y] ) ) : null;
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return @mysql_fetch_row( $this->_mysql_last_result );
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} else {
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$this->print_error(/*WP_I18N_DB_GETROW_ERROR*/" \$db->get_row(string query, output type, int offset) -- Output type must be one of: OBJECT, ARRAY_A, ARRAY_N"/*/WP_I18N_DB_GETROW_ERROR*/);
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}
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@ -1343,8 +1339,13 @@ class wpdb {
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$new_array = array();
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// Extract the column values
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for ( $i = 0, $j = count( $this->last_result ); $i < $j; $i++ ) {
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$new_array[$i] = $this->get_var( null, $x, $i );
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@mysql_data_seek( $this->_mysql_last_result, 0 );
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for ( $i = 0, $j = $this->num_rows; $i < $j; $i++ ) {
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$values = @mysql_fetch_row( $this->_mysql_last_result );
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if ( isset( $values[$x] ) && $values[$x] !== '' )
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$new_array[$i] = $values[$x];
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else
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$new_array[$i] = null;
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}
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return $new_array;
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}
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@ -1371,30 +1372,32 @@ class wpdb {
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return null;
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$new_array = array();
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@mysql_data_seek( $this->_mysql_last_result, 0 );
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if ( $output == OBJECT ) {
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// Return an integer-keyed array of row objects
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return $this->last_result;
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for ( $i = 0, $j = $this->num_rows; $i < $j; $i++ ) {
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$new_array[] = @mysql_fetch_object( $this->_mysql_last_result );
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}
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return $new_array;
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} elseif ( $output == OBJECT_K ) {
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// Return an array of row objects with keys from column 1
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// (Duplicates are discarded)
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foreach ( $this->last_result as $row ) {
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while ( $row = @mysql_fetch_object( $this->_mysql_last_result ) ) {
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$key = array_shift( $var_by_ref = get_object_vars( $row ) );
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if ( ! isset( $new_array[ $key ] ) )
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$new_array[ $key ] = $row;
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}
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return $new_array;
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} elseif ( $output == ARRAY_A || $output == ARRAY_N ) {
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// Return an integer-keyed array of...
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if ( $this->last_result ) {
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foreach( (array) $this->last_result as $row ) {
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if ( $output == ARRAY_N ) {
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// ...integer-keyed row arrays
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$new_array[] = array_values( get_object_vars( $row ) );
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} else {
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// ...column name-keyed row arrays
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$new_array[] = get_object_vars( $row );
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}
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} elseif ( $output == ARRAY_A ) {
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// Return an integer-keyed array of column name-keyed row arrays
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for ( $i = 0, $j = $this->num_rows; $i < $j; $i++ ) {
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$new_array[] = @mysql_fetch_assoc( $this->_mysql_last_result );
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}
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return $new_array;
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} elseif ( $output == ARRAY_N ) {
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// Return an integer-keyed array of integer-keyed row arrays
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for ( $i = 0, $j = $this->num_rows; $i < $j; $i++ ) {
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$new_array[] = @mysql_fetch_row( $this->_mysql_last_result );
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}
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return $new_array;
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}
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@ -1559,6 +1562,20 @@ class wpdb {
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function db_version() {
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return preg_replace( '/[^0-9.].*/', '', mysql_get_server_info( $this->dbh ) );
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}
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/**
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* Magic getter used for the deprecated last_result property.
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*
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* @since 3.1.0
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* @access private
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*/
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function __get( $name ) {
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if ( 'last_result' == $name ) {
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_deprecated_argument( 'wpdb', '3.1', __( 'The last_result property is deprecated. Use $wpdb->get_result().' ) );
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return $this->get_results();
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}
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return null;
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}
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}
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?>
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