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-rw-r--r--lib/sqlalchemy/dialects/mysql/base.py31
1 files changed, 29 insertions, 2 deletions
diff --git a/lib/sqlalchemy/dialects/mysql/base.py b/lib/sqlalchemy/dialects/mysql/base.py
index dca7b9a00..d009d656e 100644
--- a/lib/sqlalchemy/dialects/mysql/base.py
+++ b/lib/sqlalchemy/dialects/mysql/base.py
@@ -808,6 +808,7 @@ from ...sql import coercions
from ...sql import compiler
from ...sql import elements
from ...sql import roles
+from ...sql import util as sql_util
from ...types import BINARY
from ...types import BLOB
from ...types import BOOLEAN
@@ -1494,9 +1495,28 @@ class MySQLCompiler(compiler.SQLCompiler):
def for_update_clause(self, select, **kw):
if select._for_update_arg.read:
- return " LOCK IN SHARE MODE"
+ tmp = " LOCK IN SHARE MODE"
else:
- return " FOR UPDATE"
+ tmp = " FOR UPDATE"
+
+ if select._for_update_arg.of and self.dialect.supports_for_update_of:
+
+ tables = util.OrderedSet()
+ for c in select._for_update_arg.of:
+ tables.update(sql_util.surface_selectables_only(c))
+
+ tmp += " OF " + ", ".join(
+ self.process(table, ashint=True, use_schema=False, **kw)
+ for table in tables
+ )
+
+ if select._for_update_arg.nowait:
+ tmp += " NOWAIT"
+
+ if select._for_update_arg.skip_locked and self.dialect._is_mysql:
+ tmp += " SKIP LOCKED"
+
+ return tmp
def limit_clause(self, select, **kw):
# MySQL supports:
@@ -2211,6 +2231,9 @@ class MySQLDialect(default.DefaultDialect):
sequences_optional = True
+ supports_for_update_of = False # default for MySQL ...
+ # ... may be updated to True for MySQL 8+ in initialize()
+
supports_sane_rowcount = True
supports_sane_multi_rowcount = False
supports_multivalues_insert = True
@@ -2526,6 +2549,10 @@ class MySQLDialect(default.DefaultDialect):
self._is_mariadb and self.server_version_info >= (10, 3)
)
+ self.supports_for_update_of = (
+ self._is_mysql and self.server_version_info >= (8,)
+ )
+
self._needs_correct_for_88718_96365 = (
not self._is_mariadb and self.server_version_info >= (8,)
)