diff options
Diffstat (limited to 'lib/sqlalchemy/dialects')
| -rw-r--r-- | lib/sqlalchemy/dialects/mysql/base.py | 31 |
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,) ) |
