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<?php |
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namespace EventEspresso\core\services\database; |
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/** |
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* |
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* Class TableAnalysis |
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* |
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* For analyzing database tables; should not perform any manipulation, or have |
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* any EE business logic |
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* |
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* @package Event Espresso |
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* @subpackage |
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* @author Mike Nelson |
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* @since $VID:$ |
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* |
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*/ |
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class TableAnalysis extends \EE_Base { |
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/** |
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* Returns the table name which will definitely have the wpdb prefix on the front, |
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* except if it currently has the wpdb->base_prefix on the front, in which case |
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* it will have the wpdb->base_prefix on it |
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* |
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* @global \wpdb $wpdb |
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* @param string $table_name |
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* @return string $tableName, having ensured it has the wpdb prefix on the front |
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*/ |
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public function ensureTableNameHasPrefix( $table_name ) |
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{ |
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global $wpdb; |
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return strpos( $table_name, $wpdb->base_prefix ) === 0 ? $table_name : $wpdb->prefix . $table_name; |
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} |
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/** |
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* Indicates whether or not the table has any entries. $table_name can |
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* optionally start with $wpdb->prefix or not |
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* @global \wpdb $wpdb |
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* @param string $table_name |
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* @return bool |
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*/ |
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public function tableIsEmpty( $table_name ) |
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{ |
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global $wpdb; |
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$table_name = $this->ensureTableNameHasPrefix( $table_name ); |
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if ( $this->tableExists( $table_name ) ) { |
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$count = $wpdb->get_var( "SELECT COUNT(*) FROM $table_name" ); |
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return absint( $count ) === 0 ? true : false; |
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} |
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return false; |
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} |
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/** |
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* Indicates whether or not the table exists. $table_name can optionally |
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* have the $wpdb->prefix on the beginning, or not. |
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* @global \wpdb $wpdb |
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* @global array EZSQL_Error |
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* @param $table_name |
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* @return bool |
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*/ |
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public function tableExists( $table_name ) |
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{ |
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global $wpdb, $EZSQL_ERROR; |
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$table_name = $this->ensureTableNameHasPrefix( $table_name ); |
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//ignore if this causes an sql error |
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$old_error = $wpdb->last_error; |
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$old_suppress_errors = $wpdb->suppress_errors(); |
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$old_show_errors_value = $wpdb->show_errors( FALSE ); |
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$ezsql_error_cache = $EZSQL_ERROR; |
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$wpdb->get_results( "SELECT * from $table_name LIMIT 1"); |
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$wpdb->show_errors( $old_show_errors_value ); |
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$wpdb->suppress_errors( $old_suppress_errors ); |
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$new_error = $wpdb->last_error; |
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$wpdb->last_error = $old_error; |
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$EZSQL_ERROR = $ezsql_error_cache; |
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//if there was a table doesn't exist error |
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if( ! empty( $new_error ) ) { |
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if( |
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in_array( |
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\EEH_Activation::last_wpdb_error_code(), |
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array( |
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1051, //bad table |
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1109, //unknown table |
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117, //no such table |
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) |
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) |
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|| |
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preg_match( '~^Table .* doesn\'t exist~', $new_error ) //in case not using mysql and error codes aren't reliable, just check for this error string |
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) { |
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return false; |
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} else { |
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//log this because that's weird. Just use the normal PHP error log |
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error_log( |
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sprintf( |
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__( 'Event Espresso error detected when checking if table existed: %1$s (it wasn\'t just that the table didn\'t exist either)', 'event_espresso' ), |
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$new_error |
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) |
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); |
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} |
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} |
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return true; |
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} |
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/** |
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* @param $table_name |
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* @param $index_name |
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* @return array of columns used on that index, Each entry is an object with the following properties { |
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* @type string Table |
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* @type string Non_unique "0" or "1" |
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* @type string Key_name |
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* @type string Seq_in_index |
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* @type string Column_name |
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* @type string Collation |
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* @type string Cardinality |
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* @type string Sub_part on a column, usually this is just the number of characters from this column to use in indexing |
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* @type string|null Packed |
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* @type string Null |
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* @type string Index_type |
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* @type string Comment |
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* @type string Index_comment |
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* } |
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*/ |
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public function showIndexes($table_name, $index_name){ |
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global $wpdb; |
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$table_name = $this->ensureTableNameHasPrefix($table_name); |
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$index_exists_query = "SHOW INDEX FROM {$table_name} WHERE Key_name = '{$index_name}'"; |
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return $wpdb->get_results($index_exists_query); |
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} |
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} |
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eventespresso /
event-espresso-core
