ext/pdo_pgsql: Expanding COPY input from an array to an iterable

close phpGH-15893

Author: KentarouTakeda

NEWS

@@ -2,4 +2,7 @@ PHP                                                                        NEWS
 |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
 ?? ??? ????, PHP 8.5.0alpha1
 
+- PDO_PGSQL:
+  . Added Iterable support for PDO::pgsqlCopyFromArray. (KentarouTakeda)
+
 <<< NOTE: Insert NEWS from last stable release here prior to actual release! >>>

UPGRADING

@@ -39,6 +39,9 @@ PHP 8.5 UPGRADE NOTES
 5. Changed Functions
 ========================================
 
+- PDO_PGSQL:
+  . PDO::pgsqlCopyFromArray also supports inputs as Iterable.
+
 ========================================
 6. New Functions
 ========================================

ext/pdo_pgsql/pgsql_driver.c

@@ -31,6 +31,7 @@
 #include "php_pdo_pgsql.h"
 #include "php_pdo_pgsql_int.h"
 #include "zend_exceptions.h"
+#include "zend_interfaces.h"
 #include "zend_smart_str.h"
 #include "pgsql_driver_arginfo.h"
 
@@ -606,6 +607,32 @@ static bool pgsql_handle_rollback(pdo_dbh_t *dbh)
 	return ret;
 }
 
+static bool _pdo_pgsql_send_copy_data(pdo_pgsql_db_handle *H, zval *line) {
+	size_t query_len;
+	char *query;
+
+	if (!try_convert_to_string(line)) {
+		return false;
+	}
+
+	query_len = Z_STRLEN_P(line);
+	query = emalloc(query_len + 2); /* room for \n\0 */
+	memcpy(query, Z_STRVAL_P(line), query_len);
+
+	if (query[query_len - 1] != '\n') {
+		query[query_len++] = '\n';
+	}
+	query[query_len] = '\0';
+
+	if (PQputCopyData(H->server, query, query_len) != 1) {
+		efree(query);
+		return false;
+	}
+
+	efree(query);
+	return true;
+}
+
 void pgsqlCopyFromArray_internal(INTERNAL_FUNCTION_PARAMETERS)
 {
 	pdo_dbh_t *dbh;
@@ -620,14 +647,14 @@ void pgsqlCopyFromArray_internal(INTERNAL_FUNCTION_PARAMETERS)
 	PGresult *pgsql_result;
 	ExecStatusType status;
 
-	if (zend_parse_parameters(ZEND_NUM_ARGS(), "sa|sss!",
+	if (zend_parse_parameters(ZEND_NUM_ARGS(), "sA|sss!",
 		&table_name, &table_name_len, &pg_rows,
 		&pg_delim, &pg_delim_len, &pg_null_as, &pg_null_as_len, &pg_fields, &pg_fields_len) == FAILURE) {
 		RETURN_THROWS();
 	}
 
-	if (!zend_hash_num_elements(Z_ARRVAL_P(pg_rows))) {
-		zend_argument_must_not_be_empty_error(2);
+	if ((Z_TYPE_P(pg_rows) != IS_ARRAY && !instanceof_function(Z_OBJCE_P(pg_rows), zend_ce_traversable))) {
+		zend_argument_type_error(2, "must be of type array or Traversable");
 		RETURN_THROWS();
 	}
 
@@ -661,36 +688,35 @@ void pgsqlCopyFromArray_internal(INTERNAL_FUNCTION_PARAMETERS)
 
 	if (status == PGRES_COPY_IN && pgsql_result) {
 		int command_failed = 0;
-		size_t buffer_len = 0;
 		zval *tmp;
+		zend_object_iterator *iter;
 
 		PQclear(pgsql_result);
-		ZEND_HASH_FOREACH_VAL(Z_ARRVAL_P(pg_rows), tmp) {
-			size_t query_len;
-			if (!try_convert_to_string(tmp)) {
-				efree(query);
+
+		if (Z_TYPE_P(pg_rows) == IS_ARRAY) {
+			ZEND_HASH_FOREACH_VAL(Z_ARRVAL_P(pg_rows), tmp) {
+				if (!_pdo_pgsql_send_copy_data(H, tmp)) {
+					pdo_pgsql_error(dbh, PGRES_FATAL_ERROR, NULL);
+					PDO_HANDLE_DBH_ERR();
+					RETURN_FALSE;
+				}
+			} ZEND_HASH_FOREACH_END();
+		} else {
+			iter = Z_OBJ_P(pg_rows)->ce->get_iterator(Z_OBJCE_P(pg_rows), pg_rows, 0);
+			if (iter == NULL || EG(exception)) {
 				RETURN_THROWS();
 			}
 
-			if (buffer_len < Z_STRLEN_P(tmp)) {
-				buffer_len = Z_STRLEN_P(tmp);
-				query = erealloc(query, buffer_len + 2); /* room for \n\0 */
-			}
-			query_len = Z_STRLEN_P(tmp);
-			memcpy(query, Z_STRVAL_P(tmp), query_len);
-			if (query[query_len - 1] != '\n') {
-				query[query_len++] = '\n';
-			}
-			query[query_len] = '\0';
-			if (PQputCopyData(H->server, query, query_len) != 1) {
-				efree(query);
-				pdo_pgsql_error(dbh, PGRES_FATAL_ERROR, NULL);
-				PDO_HANDLE_DBH_ERR();
-				RETURN_FALSE;
+			for (; iter->funcs->valid(iter) == SUCCESS && EG(exception) == NULL; iter->funcs->move_forward(iter)) {
+				tmp = iter->funcs->get_current_data(iter);
+				if (!_pdo_pgsql_send_copy_data(H, tmp)) {
+					zend_iterator_dtor(iter);
+					pdo_pgsql_error(dbh, PGRES_FATAL_ERROR, NULL);
+					PDO_HANDLE_DBH_ERR();
+					RETURN_FALSE;
+				}
 			}
-		} ZEND_HASH_FOREACH_END();
-		if (query) {
-			efree(query);
+			zend_iterator_dtor(iter);
 		}
 
 		if (PQputCopyEnd(H->server, NULL) != 1) {

ext/pdo_pgsql/pgsql_driver.stub.php

@@ -8,7 +8,7 @@
  */
 class PDO_PGSql_Ext {
     /** @tentative-return-type */
-    public function pgsqlCopyFromArray(string $tableName, array $rows, string $separator = "\t", string $nullAs = "\\\\N", ?string $fields = null): bool {}
+    public function pgsqlCopyFromArray(string $tableName, array | Traversable $rows, string $separator = "\t", string $nullAs = "\\\\N", ?string $fields = null): bool {}
 
     /** @tentative-return-type */
     public function pgsqlCopyFromFile(string $tableName, string $filename, string $separator = "\t", string $nullAs = "\\\\N", ?string $fields = null): bool {}

ext/pdo_pgsql/pgsql_driver_arginfo.h

@@ -0,0 +1,51 @@
+--TEST--
+PDO PgSQL pgsqlCopyFromArray using Generator
+--EXTENSIONS--
+pdo_pgsql
+--SKIPIF--
+<?php
+require __DIR__ . '/config.inc';
+require __DIR__ . '/../../../ext/pdo/tests/pdo_test.inc';
+PDOTest::skip();
+?>
+--FILE--
+<?php
+require __DIR__ . '/../../../ext/pdo/tests/pdo_test.inc';
+$db = PDOTest::test_factory(__DIR__ . '/common.phpt');
+$db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
+$db->setAttribute(PDO::ATTR_STRINGIFY_FETCHES, false);
+
+$db->exec('CREATE TABLE test_copy_from_generator (v int)');
+
+$generator = (function(){
+    $position = 0;
+    $values = [1, 1, 2, 3, 5];
+
+    while(isset($values[$position])){
+        yield $values[$position];
+        ++$position;
+    }
+})();
+
+
+$db->pgsqlCopyFromArray('test_copy_from_generator',$generator);
+
+$stmt = $db->query("select * from test_copy_from_generator order by 1");
+$result = $stmt->fetchAll(PDO::FETCH_COLUMN, 0);
+var_export($result);
+
+?>
+--CLEAN--
+<?php
+require __DIR__ . '/../../../ext/pdo/tests/pdo_test.inc';
+$db = PDOTest::test_factory(__DIR__ . '/common.phpt');
+$db->query('DROP TABLE IF EXISTS test_copy_from_generator CASCADE');
+?>
+--EXPECT--
+array (
+  0 => 1,
+  1 => 1,
+  2 => 2,
+  3 => 3,
+  4 => 5,
+)

ext/pdo_pgsql/tests/copy_from_generator.phpt

@@ -0,0 +1,65 @@
+--TEST--
+PDO PgSQL pgsqlCopyFromArray using Iterator
+--EXTENSIONS--
+pdo_pgsql
+--SKIPIF--
+<?php
+require __DIR__ . '/config.inc';
+require __DIR__ . '/../../../ext/pdo/tests/pdo_test.inc';
+PDOTest::skip();
+?>
+--FILE--
+<?php
+require __DIR__ . '/../../../ext/pdo/tests/pdo_test.inc';
+$db = PDOTest::test_factory(__DIR__ . '/common.phpt');
+$db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
+$db->setAttribute(PDO::ATTR_STRINGIFY_FETCHES, false);
+
+$db->exec('CREATE TABLE test_copy_from_traversable (v int)');
+
+$iterator = new class implements Iterator{
+    private $position = 0;
+    private $values = [1, 1, 2, 3, 5];
+
+    public function rewind(): void {
+        $this->position = 0;
+    }
+
+    public function current(): int {
+        return $this->values[$this->position];
+    }
+
+    public function key(): int {
+        return $this->position;
+    }
+
+    public function next(): void {
+        ++$this->position;
+    }
+
+    public function valid(): bool {
+        return isset($this->values[$this->position]);
+    }
+};
+
+$db->pgsqlCopyFromArray('test_copy_from_traversable',$iterator);
+
+$stmt = $db->query("select * from test_copy_from_traversable order by 1");
+$result = $stmt->fetchAll(PDO::FETCH_COLUMN, 0);
+var_export($result);
+
+?>
+--CLEAN--
+<?php
+require __DIR__ . '/../../../ext/pdo/tests/pdo_test.inc';
+$db = PDOTest::test_factory(__DIR__ . '/common.phpt');
+$db->query('DROP TABLE IF EXISTS test_copy_from_traversable CASCADE');
+?>
+--EXPECT--
+array (
+  0 => 1,
+  1 => 1,
+  2 => 2,
+  3 => 3,
+  4 => 5,
+)