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<?php |
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|
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if (!defined('ABSPATH')) { |
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exit; |
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} |
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|
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trait ABJ_404_Solution_DatabaseUpgradesEtc_SchemaDiffTrait { |
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|
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/** |
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* @param string $tableName |
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* @param string $createTableStatementGoal |
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* @return void |
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*/ |
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function verifyColumns($tableName, $createTableStatementGoal) { |
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$updatesWereNeeded = false; |
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|
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// find the differences |
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$tableDifferences = $this->getTableDifferences($tableName, $createTableStatementGoal); |
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$updateCols = is_array($tableDifferences['updateTheseColumns']) ? $tableDifferences['updateTheseColumns'] : []; |
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$createCols = is_array($tableDifferences['createTheseColumns']) ? $tableDifferences['createTheseColumns'] : []; |
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if (count($updateCols) > 0 || |
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count($createCols) > 0) { |
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$updatesWereNeeded = true; |
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} |
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// make the changes |
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$this->updateATableBasedOnDifferences($tableName, $tableDifferences); |
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|
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// verify that there are now no changes that need to be made. |
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$tableDifferences = $this->getTableDifferences($tableName, $createTableStatementGoal); |
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$updateCols = is_array($tableDifferences['updateTheseColumns']) ? $tableDifferences['updateTheseColumns'] : []; |
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$createCols = is_array($tableDifferences['createTheseColumns']) ? $tableDifferences['createTheseColumns'] : []; |
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|
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if (count($updateCols) > 0 || |
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count($createCols) > 0) { |
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|
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// Persistent post-update diff is usually a benign DDL-normalizer mismatch |
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// (parser misreads a comment, column landed in a slightly-different form). |
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// Plugin keeps functioning, so log at warn (stays in debug log without |
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// crossing the email-threshold reporter). Defensive coding philosophy #8. |
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$this->logger->warn("There are still differences after updating the " . |
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$tableName . " table. " . print_r($tableDifferences, true)); |
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|
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} else if ($updatesWereNeeded) { |
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$this->logger->infoMessage("No more differences found after updating the " . |
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$tableName . " table columns. All is well."); |
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} |
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} |
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|
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/** |
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* @param string $tableName |
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* @param string $createTableStatementGoal |
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* @return array<string, mixed> |
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*/ |
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function getTableDifferences($tableName, $createTableStatementGoal) { |
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|
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// get the current create table statement |
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$existingTableSQL = $this->dbCore->getCreateTableDDL($tableName); |
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|
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$existingTableSQL = strtolower($this->removeCommentsFromColumns($existingTableSQL)); |
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$createTableStatementGoal = strtolower( |
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$this->removeCommentsFromColumns($createTableStatementGoal)); |
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|
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// remove the "COLLATE xxx" from the columns. |
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$removeCollatePattern = '/collate[= ]\w+ ?/'; |
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$existingTableSQL = preg_replace($removeCollatePattern, "", $existingTableSQL) ?? ''; |
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$createTableStatementGoal = preg_replace($removeCollatePattern, "", $createTableStatementGoal) ?? ''; |
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|
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// remove the int size format from columns because it doesn't matter. |
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$removeIntSizePattern = '/( \w*?int)(\(\d+\))/m'; |
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$existingTableSQL = preg_replace($removeIntSizePattern, "$1", $existingTableSQL) ?? ''; |
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$createTableStatementGoal = preg_replace($removeIntSizePattern, "$1", $createTableStatementGoal) ?? ''; |
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|
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// MySQL's SHOW CREATE TABLE omits "DEFAULT NULL" for TEXT/BLOB columns |
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// (it's implicit). Normalize both sides so this doesn't flag as a mismatch. |
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$removeTextDefaultNull = '/(text|blob|mediumtext|longtext|tinytext|mediumblob|longblob|tinyblob)\s+default\s+null/'; |
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$existingTableSQL = preg_replace($removeTextDefaultNull, "$1", $existingTableSQL) ?? $existingTableSQL; |
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$createTableStatementGoal = preg_replace($removeTextDefaultNull, "$1", $createTableStatementGoal) ?? $createTableStatementGoal; |
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|
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// get column names and types pattern (backticks are optional — accept both styles); |
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// (?!key\b) guards against accidentally matching PRIMARY KEY / UNIQUE KEY lines. |
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$colNamesAndTypesPattern = "/\s+?(`?(\w+?)`? (?!key\b)(\w.+)\s?),/"; |
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$existingTableMatches = null; |
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$goalTableMatches = null; |
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// match the existing table. use preg_match_all because I couldn't find an |
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// "_all" option when using mb_ereg. |
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preg_match_all($colNamesAndTypesPattern, $existingTableSQL, $existingTableMatches); |
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preg_match_all($colNamesAndTypesPattern, $createTableStatementGoal, $goalTableMatches); |
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|
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// get the matches. |
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$goalTableMatchesColumnNames = $goalTableMatches[2]; |
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$existingTableMatchesColumnNames = $existingTableMatches[2]; |
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|
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// remove any spaces |
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$goalTableMatchesColumnNames = array_map('trim', $goalTableMatchesColumnNames); |
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$existingTableMatchesColumnNames = array_map('trim', $existingTableMatchesColumnNames); |
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|
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// Safety guard: if the goal DDL produced zero column names the regex failed |
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// to parse it (e.g. malformed or unparseable DDL). In that case never drop |
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// any existing columns — an empty goal list would otherwise flag every real |
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// column as "extra" and wipe the table. |
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if (empty($goalTableMatchesColumnNames) && !empty($existingTableMatchesColumnNames)) { |
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$this->logger->errorMessage("Goal DDL for " . $tableName . |
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" produced no column matches -- the DDL may be malformed or unparseable. " . |
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"Skipping column comparison to prevent data loss."); |
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$dropTheseColumns = []; |
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$createTheseColumns = []; |
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return array("updateTheseColumns" => [], |
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"dropTheseColumns" => [], |
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"createTheseColumns" => [], |
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"goalTableMatchesColumnDDL" => [], |
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"existingTableMatchesColumnDDL" => [], |
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"goalTableMatches" => $goalTableMatches, |
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"goalTableMatchesColumnNames" => [] |
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); |
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} |
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|
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// see if some columns need to be created. |
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$dropTheseColumns = array_diff($existingTableMatchesColumnNames, |
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$goalTableMatchesColumnNames); |
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$createTheseColumns = array_diff($goalTableMatchesColumnNames, |
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$existingTableMatchesColumnNames); |
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|
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// get the ddl for each column |
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$goalTableMatchesColumnDDL = $goalTableMatches[1]; |
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$existingTableMatchesColumnDDL = $existingTableMatches[1]; |
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|
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// remove any spaces |
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$goalTableMatchesColumnDDL = array_map('trim', $goalTableMatchesColumnDDL); |
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$existingTableMatchesColumnDDL = array_map('trim', $existingTableMatchesColumnDDL); |
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|
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// normalize minor differences between mysql versions (strip backticks so DDL |
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// files using either quoting style compare equal to SHOW CREATE TABLE output) |
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$goalTableMatchesColumnDDL = array_map([$this, 'normalizeColumnDDL'], $goalTableMatchesColumnDDL); |
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$existingTableMatchesColumnDDL = array_map([$this, 'normalizeColumnDDL'], $existingTableMatchesColumnDDL); |
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|
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// see if anything needs to be updated or created. |
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$updateTheseColumns = array_diff($goalTableMatchesColumnDDL, |
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$existingTableMatchesColumnDDL); |
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|
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// wrap the results |
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$results = array("updateTheseColumns" => $updateTheseColumns, |
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"dropTheseColumns" => $dropTheseColumns, |
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"createTheseColumns" => $createTheseColumns, |
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"goalTableMatchesColumnDDL" => $goalTableMatchesColumnDDL, |
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"existingTableMatchesColumnDDL" => $existingTableMatchesColumnDDL, |
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"goalTableMatches" => $goalTableMatches, |
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"goalTableMatchesColumnNames" => $goalTableMatchesColumnNames |
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); |
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return $results; |
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} |
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|
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/** |
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* @param string $tableName |
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* @param array<string, mixed> $tableDifferences |
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* @return void |
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*/ |
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function updateATableBasedOnDifferences($tableName, $tableDifferences) { |
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|
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/** @var array<int|string, mixed> $dropTheseColumns */ |
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$dropTheseColumns = is_array($tableDifferences['dropTheseColumns']) ? $tableDifferences['dropTheseColumns'] : []; |
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/** @var array<int|string, mixed> $updateTheseColumns */ |
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$updateTheseColumns = is_array($tableDifferences['updateTheseColumns']) ? $tableDifferences['updateTheseColumns'] : []; |
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/** @var array<int|string, mixed> $createTheseColumns */ |
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$createTheseColumns = is_array($tableDifferences['createTheseColumns']) ? $tableDifferences['createTheseColumns'] : []; |
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$goalTableMatchesColumnDDL = is_array($tableDifferences['goalTableMatchesColumnDDL']) ? $tableDifferences['goalTableMatchesColumnDDL'] : []; |
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$existingTableMatchesColumnDDL = is_array($tableDifferences['existingTableMatchesColumnDDL']) ? $tableDifferences['existingTableMatchesColumnDDL'] : []; |
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/** @var array<int, array<int, mixed>> $goalTableMatches */ |
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$goalTableMatches = is_array($tableDifferences['goalTableMatches']) ? $tableDifferences['goalTableMatches'] : []; |
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/** @var array<int|string, mixed> $goalTableMatchesColumnNames */ |
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$goalTableMatchesColumnNames = is_array($tableDifferences['goalTableMatchesColumnNames']) ? $tableDifferences['goalTableMatchesColumnNames'] : []; |
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|
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// drop unnecessary columns — but never drop ALL columns (MySQL error: |
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// "You can't delete all columns with ALTER TABLE; use DROP TABLE instead"). |
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// This happens when a table is completely restructured and every existing |
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// column name differs from the goal schema. |
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$existingColumnCount = count($existingTableMatchesColumnDDL); |
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if (count($dropTheseColumns) > 0 && count($dropTheseColumns) >= $existingColumnCount) { |
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$this->logger->warn("Skipping column drops on " . $tableName . |
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" because it would remove all " . $existingColumnCount . |
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" existing columns. Drops requested: " . implode(', ', $dropTheseColumns)); |
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} else { |
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foreach ($dropTheseColumns as $colName) { |
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$query = "alter table " . $tableName . " drop " . $colName; |
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$this->dbCore->queryAndGetResults($query); |
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$this->logger->infoMessage("I dropped a column (1): " . $query); |
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} |
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} |
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|
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// say why we're doing what we're doing. |
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if (count($updateTheseColumns) > 0) { |
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$this->logger->infoMessage(self::$uniqID . ": On " . $tableName . |
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" I'm updating various columns because we want: \n`" . |
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print_r($goalTableMatchesColumnDDL, true) . "\n but we have: \n" . |
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print_r($existingTableMatchesColumnDDL, true)); |
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} |
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|
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// create missing columns |
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// Normalize $goalMatchesSub using the same normalizeColumnDDL() that |
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// getTableDifferences() uses, so array_search() can find the right index. |
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$goalMatchesSub = is_array($goalTableMatches[1] ?? null) ? $goalTableMatches[1] : []; |
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$goalMatchesSub = array_map([$this, 'normalizeColumnDDL'], $goalMatchesSub); |
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foreach ($updateTheseColumns as $colDDL) { |
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// find the colum name. |
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$matchIndex = array_search($colDDL, $goalMatchesSub); |
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if ($matchIndex === false) { |
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$this->logger->warn("Could not match column DDL to goal schema, skipping: " . $colDDL); |
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continue; |
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} |
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$colName = is_string($goalTableMatchesColumnNames[$matchIndex] ?? null) ? $goalTableMatchesColumnNames[$matchIndex] : ''; |
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|
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// if the column exists then update it. otherwise create it. |
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if (!in_array($colName, $createTheseColumns)) { |
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// update the existing column. |
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// ALTER TABLE `mywp_abj404_redirects` CHANGE `status` `status` BIGINT(19) NOT NULL; |
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$updateColStatement = "alter table " . $tableName . " change " . $colName . |
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" " . $colDDL; |
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$this->dbCore->queryAndGetResults($updateColStatement); |
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$this->logger->infoMessage("I updated a column: " . $updateColStatement); |
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|
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} else { |
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// create the column. |
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$createColStatement = "alter table " . $tableName . " add " . $colDDL; |
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$this->dbCore->queryAndGetResults($createColStatement); |
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$this->logger->infoMessage("I added a column: " . $createColStatement); |
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} |
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|
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$this->handleSpecificCases($tableName, $colName); |
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} |
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} |
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|
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/** Create table DDL is returned without SQL comments of any kind. |
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* Strips block comments (slash-star ... star-slash), line comments (-- ...), |
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* and inline COMMENT 'text' column clauses so the column-name regex in |
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* getTableDifferences() cannot mistake comment text for column definitions. |
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* @param string|null $createTableDDL |
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* @return string |
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*/ |
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function removeCommentsFromColumns($createTableDDL) { |
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if ($createTableDDL === null) { |
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return ''; |
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} |
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$ddl = (string) $createTableDDL; |
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// Strip block comments (slash-star ... star-slash), including multi-line. |
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$ddl = preg_replace('/\/\*.*?\*\//s', '', $ddl) ?? $ddl; |
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// Strip line comments (-- ...). |
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$ddl = preg_replace('/--[^\r\n]*/', '', $ddl) ?? $ddl; |
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// Strip inline COMMENT 'text', clauses from column definitions. |
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return preg_replace('/ (?:COMMENT.+?,[\r\n])/', ",\n", $ddl) ?? $ddl; |
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} |
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/** |
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* Normalize a single column DDL fragment for comparison. |
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* |
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* Strips backticks and unquotes integer defaults so that DDL from |
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* SHOW CREATE TABLE (e.g. default '1') matches the goal DDL file |
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* (e.g. default 1). Used by both getTableDifferences() and |
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* updateATableBasedOnDifferences() — a single source of truth |
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* prevents the two normalization sites from drifting out of sync. |
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* |
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* @param mixed $ddl A column DDL string (or non-string from regex match) |
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* @return string |
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*/ |
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function normalizeColumnDDL($ddl): string { |
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$ddlStr = is_string($ddl) ? $ddl : ''; |
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$normalized = strtolower(str_replace('`', '', trim($ddlStr))); |
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$normalized = preg_replace("/default '(\d+)'/", 'default $1', $normalized) ?? $normalized; |
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// MySQL omits DEFAULT NULL for nullable columns — strip it so DDL file |
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// and SHOW CREATE TABLE produce identical normalized strings. |
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$normalized = preg_replace('/\s+default\s+null\b/', '', $normalized) ?? $normalized; |
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return $normalized; |
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} |
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|
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/** |
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* @param string $tableName |
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* @return void |
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*/ |
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function deleteIndexes($tableName) { |
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|
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// get the indexes list. |
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$results = $this->dbCore->queryAndGetResults("show index from " . $tableName . |
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" where key_name != 'PRIMARY'"); |
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/** @var array<int, array<string, mixed>> $rows */ |
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$rows = isset($results['rows']) && is_array($results['rows']) ? $results['rows'] : []; |
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|
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if (empty($rows)) { |
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return; |
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} |
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|
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// find the key_name column because the case can be different on different systems. |
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$keyNameColumn = 'key_name'; |
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$aRow = $rows[0]; |
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foreach (array_keys($aRow) as $someKey) { |
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if ($this->f->strtolower((string)$someKey) == 'key_name') { |
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$keyNameColumn = (string)$someKey; |
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break; |
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} |
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} |
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|
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foreach ($rows as $row) { |
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// delete them |
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$indexName = $row[$keyNameColumn] ?? ''; |
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if (!is_string($indexName) || $indexName === '') { |
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continue; |
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} |
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$query = "alter table " . $tableName . " drop index " . $indexName; |
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$this->dbCore->queryAndGetResults($query); |
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} |
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} |
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} |
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|
