+ foreach ($foreign['mod'] + $foreign['add'] as $keyName) {
+ $this->appendAlterAddForeign($phrase, $keyName, $def['foreign keys'][$keyName]);
+ }
+
+ $this->appendAlterExtras($phrase, $tableName, $def);
+
+ if (count($phrase) > 0) {
+ $sql = 'ALTER TABLE ' . $tableName . ' ' . implode(",\n", $phrase);
+ $statements[] = $sql;
+ }
+
+ // Now create any indexes...
+ foreach ($indexes['mod'] + $indexes['add'] as $indexName) {
+ $this->appendCreateIndex($statements, $tableName, $indexName, $def['indexes'][$indexName]);
+ }
+
+ foreach ($fulltext['mod'] + $fulltext['add'] as $indexName) {
+ $colDef = $def['fulltext indexes'][$indexName];
+ $this->appendCreateFulltextIndex($statements, $tableName, $indexName, $colDef);
+ }
+
+ return $statements;
+ }
+
+ function diffArrays($oldDef, $newDef, $section, $compareCallback=null)
+ {
+ $old = isset($oldDef[$section]) ? $oldDef[$section] : array();
+ $new = isset($newDef[$section]) ? $newDef[$section] : array();
+
+ $oldKeys = array_keys($old);
+ $newKeys = array_keys($new);
+
+ $toadd = array_diff($newKeys, $oldKeys);
+ $todrop = array_diff($oldKeys, $newKeys);
+ $same = array_intersect($newKeys, $oldKeys);
+ $tomod = array();
+ $tokeep = array();
+
+ // Find which fields have actually changed definition
+ // in a way that we need to tweak them for this DB type.
+ foreach ($same as $name) {
+ if ($compareCallback) {
+ $same = call_user_func($compareCallback, $old[$name], $new[$name]);
+ } else {
+ $same = ($old[$name] == $new[$name]);
+ }
+ if ($same) {
+ $tokeep[] = $name;
+ continue;
+ }
+ $tomod[] = $name;
+ }
+ return array('add' => $toadd,
+ 'del' => $todrop,
+ 'mod' => $tomod,
+ 'keep' => $tokeep,
+ 'count' => count($toadd) + count($todrop) + count($tomod));
+ }
+
+ /**
+ * Append phrase(s) to an array of partial ALTER TABLE chunks in order
+ * to add the given column definition to the table.
+ *
+ * @param array $phrase
+ * @param string $columnName
+ * @param array $cd
+ */
+ function appendAlterAddColumn(array &$phrase, $columnName, array $cd)
+ {
+ $phrase[] = 'ADD COLUMN ' .
+ $this->quoteIdentifier($columnName) .
+ ' ' .
+ $this->columnSql($cd);
+ }
+
+ /**
+ * Append phrase(s) to an array of partial ALTER TABLE chunks in order
+ * to alter the given column from its old state to a new one.
+ *
+ * @param array $phrase
+ * @param string $columnName
+ * @param array $old previous column definition as found in DB
+ * @param array $cd current column definition
+ */
+ function appendAlterModifyColumn(array &$phrase, $columnName, array $old, array $cd)
+ {
+ $phrase[] = 'MODIFY COLUMN ' .
+ $this->quoteIdentifier($columnName) .
+ ' ' .
+ $this->columnSql($cd);
+ }
+
+ /**
+ * Append phrase(s) to an array of partial ALTER TABLE chunks in order
+ * to drop the given column definition from the table.
+ *
+ * @param array $phrase
+ * @param string $columnName
+ */
+ function appendAlterDropColumn(array &$phrase, $columnName)
+ {
+ $phrase[] = 'DROP COLUMN ' . $this->quoteIdentifier($columnName);
+ }
+
+ function appendAlterAddUnique(array &$phrase, $keyName, array $def)
+ {
+ $sql = array();
+ $sql[] = 'ADD';
+ $this->appendUniqueKeyDef($sql, $keyName, $def);
+ $phrase[] = implode(' ', $sql);
+ }
+
+ function appendAlterAddForeign(array &$phrase, $keyName, array $def)
+ {
+ $sql = array();
+ $sql[] = 'ADD';
+ $this->appendForeignKeyDef($sql, $keyName, $def);
+ $phrase[] = implode(' ', $sql);
+ }
+
+ function appendAlterAddPrimary(array &$phrase, array $def)
+ {
+ $sql = array();
+ $sql[] = 'ADD';
+ $this->appendPrimaryKeyDef($sql, $def);
+ $phrase[] = implode(' ', $sql);
+ }
+
+ function appendAlterDropPrimary(array &$phrase)
+ {
+ $phrase[] = 'DROP CONSTRAINT PRIMARY KEY';
+ }
+
+ function appendAlterDropUnique(array &$phrase, $keyName)
+ {
+ $phrase[] = 'DROP CONSTRAINT ' . $keyName;
+ }
+
+ function appendAlterDropForeign(array &$phrase, $keyName)
+ {
+ $phrase[] = 'DROP FOREIGN KEY ' . $keyName;
+ }
+
+ function appendAlterExtras(array &$phrase, $tableName, array $def)
+ {
+ // no-op
+ }
+
+ /**
+ * Quote a db/table/column identifier if necessary.
+ *
+ * @param string $name
+ * @return string
+ */
+ function quoteIdentifier($name)
+ {
+ return $name;
+ }
+
+ function quoteDefaultValue($cd)
+ {
+ if ($cd['type'] == 'datetime' && $cd['default'] == 'CURRENT_TIMESTAMP') {
+ return $cd['default'];
+ } else {
+ return $this->quoteValue($cd['default']);
+ }
+ }
+
+ function quoteValue($val)
+ {
+ return $this->conn->quoteSmart($val);
+ }
+
+ /**
+ * Check if two column definitions are equivalent.
+ * The default implementation checks _everything_ but in many cases
+ * you may be able to discard a bunch of equivalencies.
+ *
+ * @param array $a
+ * @param array $b
+ * @return boolean
+ */
+ function columnsEqual(array $a, array $b)
+ {
+ return !array_diff_assoc($a, $b) && !array_diff_assoc($b, $a);