MFH

- Fixed bug #48060 (pdo_pgsql - large objects are returned as empty)
# Backported from 5.3.0, per gripe from Konstantin Ryabitsev
# Permission granted by Ilia

NEWS

@@ -1,6 +1,7 @@
 PHP                                                                        NEWS
 |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
 0? Sep 2009, PHP 5.2.11
+- Fixed bug #48060 (pdo_pgsql - large objects are returned as empty). (Matteo)
 
 
 03 Sep 2009, PHP 5.2.11RC2

ext/pdo/pdo_stmt.c

@@ -587,9 +587,8 @@ static inline void fetch_value(pdo_stmt_t *stmt, zval *dest, int colno, int *typ
 		case PDO_PARAM_LOB:
 			if (value == NULL) {
 				ZVAL_NULL(dest);
-			} else if (value[0] == '\0') {
-				ZVAL_EMPTY_STRING(dest);
 			} else if (value_len == 0) {
+				/* Warning, empty strings need to be passed as stream */
 				if (stmt->dbh->stringify || new_type == PDO_PARAM_STR) {
 					char *buf = NULL;
 					size_t len;

ext/pdo_pgsql/pgsql_statement.c

@@ -599,8 +599,14 @@ static int pgsql_stmt_get_col(pdo_stmt_t *stmt, int colno, char **ptr, unsigned
 					return 0;
 				} else {
 					*ptr = php_pdo_pgsql_unescape_bytea(*ptr, &tmp_len);
-					*len = tmp_len;
-					*caller_frees = 1;
+					if (!tmp_len) {
+						/* Empty string, return as empty stream */
+						*ptr = (char *)php_stream_memory_open(TEMP_STREAM_READONLY, "", 0);
+						*len = 0;
+					} else {
+						*len = tmp_len;
+						*caller_frees = 1;
+					}
 				}
 				break;
 			case PDO_PARAM_NULL:

ext/pdo_pgsql/tests/bug46274_2.phpt

@@ -47,11 +47,13 @@ $res = $db->query("SELECT blob1 from test_one_blob");
 var_dump($x = $res->fetch());
 var_dump(fread($x['blob1'], 10));
 
-// Empty string
+// Resource
 var_dump($res->fetch());
+var_dump(fread($x['blob1'], 10));
 
-// Empty string
+// Resource
 var_dump($res->fetch());
+var_dump(fread($x['blob1'], 10));
 
 // NULL
 var_dump($res->fetch());
@@ -69,16 +71,18 @@ array(2) {
 string(3) "foo"
 array(2) {
   ["blob1"]=>
-  string(0) ""
+  resource(%d) of type (stream)
   [0]=>
-  string(0) ""
+  resource(%d) of type (stream)
 }
+string(0) ""
 array(2) {
   ["blob1"]=>
-  string(0) ""
+  resource(%d) of type (stream)
   [0]=>
-  string(0) ""
+  resource(%d) of type (stream)
 }
+string(0) ""
 array(2) {
   ["blob1"]=>
   NULL