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- <?php
- namespace Drupal\Core\Database\Driver\pgsql;
- use Drupal\Core\Database\Query\Upsert as QueryUpsert;
- /**
- * PostgreSQL implementation of native \Drupal\Core\Database\Query\Upsert.
- *
- * @see http://www.postgresql.org/docs/9.5/static/sql-insert.html#SQL-ON-CONFLICT
- */
- class NativeUpsert extends QueryUpsert {
- /**
- * {@inheritdoc}
- */
- public function execute() {
- if (!$this->preExecute()) {
- return NULL;
- }
- $stmt = $this->connection->prepareQuery((string) $this);
- // Fetch the list of blobs and sequences used on that table.
- $table_information = $this->connection->schema()->queryTableInformation($this->table);
- $max_placeholder = 0;
- $blobs = [];
- $blob_count = 0;
- foreach ($this->insertValues as $insert_values) {
- foreach ($this->insertFields as $idx => $field) {
- if (isset($table_information->blob_fields[$field])) {
- $blobs[$blob_count] = fopen('php://memory', 'a');
- fwrite($blobs[$blob_count], $insert_values[$idx]);
- rewind($blobs[$blob_count]);
- $stmt->bindParam(':db_insert_placeholder_' . $max_placeholder++, $blobs[$blob_count], \PDO::PARAM_LOB);
- // Pre-increment is faster in PHP than increment.
- ++$blob_count;
- }
- else {
- $stmt->bindParam(':db_insert_placeholder_' . $max_placeholder++, $insert_values[$idx]);
- }
- }
- // Check if values for a serial field has been passed.
- if (!empty($table_information->serial_fields)) {
- foreach ($table_information->serial_fields as $index => $serial_field) {
- $serial_key = array_search($serial_field, $this->insertFields);
- if ($serial_key !== FALSE) {
- $serial_value = $insert_values[$serial_key];
- // Sequences must be greater than or equal to 1.
- if ($serial_value === NULL || !$serial_value) {
- $serial_value = 1;
- }
- // Set the sequence to the bigger value of either the passed
- // value or the max value of the column. It can happen that another
- // thread calls nextval() which could lead to a serial number being
- // used twice. However, trying to insert a value into a serial
- // column should only be done in very rare cases and is not thread
- // safe by definition.
- $this->connection->query("SELECT setval('" . $table_information->sequences[$index] . "', GREATEST(MAX(" . $serial_field . "), :serial_value)) FROM {" . $this->table . "}", [':serial_value' => (int) $serial_value]);
- }
- }
- }
- }
- $options = $this->queryOptions;
- if (!empty($table_information->sequences)) {
- $options['sequence_name'] = $table_information->sequences[0];
- }
- // Re-initialize the values array so that we can re-use this query.
- $this->insertValues = [];
- // Create a savepoint so we can rollback a failed query. This is so we can
- // mimic MySQL and SQLite transactions which don't fail if a single query
- // fails. This is important for tables that are created on demand. For
- // example, \Drupal\Core\Cache\DatabaseBackend.
- $this->connection->addSavepoint();
- try {
- $this->connection->query($stmt, [], $options);
- $this->connection->releaseSavepoint();
- }
- catch (\Exception $e) {
- $this->connection->rollbackSavepoint();
- throw $e;
- }
- return TRUE;
- }
- /**
- * {@inheritdoc}
- */
- public function __toString() {
- // Create a sanitized comment string to prepend to the query.
- $comments = $this->connection->makeComment($this->comments);
- // Default fields are always placed first for consistency.
- $insert_fields = array_merge($this->defaultFields, $this->insertFields);
- $insert_fields = array_map(function ($f) {
- return $this->connection->escapeField($f);
- }, $insert_fields);
- $query = $comments . 'INSERT INTO {' . $this->table . '} (' . implode(', ', $insert_fields) . ') VALUES ';
- $values = $this->getInsertPlaceholderFragment($this->insertValues, $this->defaultFields);
- $query .= implode(', ', $values);
- // Updating the unique / primary key is not necessary.
- unset($insert_fields[$this->key]);
- $update = [];
- foreach ($insert_fields as $field) {
- $update[] = "$field = EXCLUDED.$field";
- }
- $query .= ' ON CONFLICT (' . $this->connection->escapeField($this->key) . ') DO UPDATE SET ' . implode(', ', $update);
- return $query;
- }
- }
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