"""MySQL-specific data dictionary for metadata queries via PyMySQL."""
from typing import TYPE_CHECKING, ClassVar
from mypy_extensions import mypyc_attr
from sqlspec.data_dictionary.dialects.mysql import resolve_mysql_json_type
from sqlspec.driver import SyncDataDictionaryBase
from sqlspec.typing import ColumnMetadata, ForeignKeyMetadata, IndexMetadata, TableMetadata, VersionInfo
if TYPE_CHECKING:
from sqlspec.adapters.pymysql.driver import PyMysqlDriver
__all__ = ("PyMysqlDataDictionary",)
[docs]
@mypyc_attr(allow_interpreted_subclasses=True, native_class=False)
class PyMysqlDataDictionary(SyncDataDictionaryBase):
"""MySQL-specific sync data dictionary."""
dialect: ClassVar[str] = "mysql"
[docs]
def __init__(self) -> None:
super().__init__()
[docs]
def get_version(self, driver: "PyMysqlDriver") -> "VersionInfo | None":
"""Get MySQL database version information."""
driver_id = id(driver)
# Inline cache check to avoid cross-module method call that causes mypyc segfault
if driver_id in self._version_fetch_attempted:
return self._version_cache.get(driver_id)
# Not cached, fetch from database
version_value = driver.select_value_or_none(self.get_query("version"))
if not version_value:
self._log_version_unavailable(type(self).dialect, "missing")
self.cache_version(driver_id, None)
return None
version_info = self.parse_version_with_pattern(self.get_dialect_config().version_pattern, str(version_value))
if version_info is None:
self._log_version_unavailable(type(self).dialect, "parse_failed")
self.cache_version(driver_id, None)
return None
self._log_version_detected(type(self).dialect, version_info)
self.cache_version(driver_id, version_info)
return version_info
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def get_feature_flag(self, driver: "PyMysqlDriver", feature: str) -> bool:
"""Check if MySQL database supports a specific feature."""
version_info = self.get_version(driver)
return self.resolve_feature_flag(feature, version_info)
[docs]
def get_optimal_type(self, driver: "PyMysqlDriver", type_category: str) -> str:
"""Get optimal MySQL type for a category."""
config = self.get_dialect_config()
version_info = self.get_version(driver)
if type_category == "json":
return resolve_mysql_json_type(version_info)
return config.get_optimal_type(type_category)
[docs]
def get_tables(self, driver: "PyMysqlDriver", schema: "str | None" = None) -> "list[TableMetadata]":
"""Get tables sorted by topological dependency order using the MySQL catalog."""
schema_name = self.resolve_schema(schema)
self._log_schema_introspect(driver, schema_name=schema_name, table_name=None, operation="tables")
return driver.select(self.get_query("tables_by_schema"), schema_name=schema_name, schema_type=TableMetadata)
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def get_columns(
self, driver: "PyMysqlDriver", table: "str | None" = None, schema: "str | None" = None
) -> "list[ColumnMetadata]":
"""Get column information for a table or schema."""
schema_name = self.resolve_schema(schema)
if table is None:
self._log_schema_introspect(driver, schema_name=schema_name, table_name=None, operation="columns")
return driver.select(
self.get_query("columns_by_schema"), schema_name=schema_name, schema_type=ColumnMetadata
)
self._log_table_describe(driver, schema_name=schema_name, table_name=table, operation="columns")
return driver.select(
self.get_query("columns_by_table"), table_name=table, schema_name=schema_name, schema_type=ColumnMetadata
)
[docs]
def get_indexes(
self, driver: "PyMysqlDriver", table: "str | None" = None, schema: "str | None" = None
) -> "list[IndexMetadata]":
"""Get index metadata for a table or schema."""
schema_name = self.resolve_schema(schema)
if table is None:
self._log_schema_introspect(driver, schema_name=schema_name, table_name=None, operation="indexes")
return driver.select(
self.get_query("indexes_by_schema"), schema_name=schema_name, schema_type=IndexMetadata
)
self._log_table_describe(driver, schema_name=schema_name, table_name=table, operation="indexes")
return driver.select(
self.get_query("indexes_by_table"), table_name=table, schema_name=schema_name, schema_type=IndexMetadata
)
[docs]
def get_foreign_keys(
self, driver: "PyMysqlDriver", table: "str | None" = None, schema: "str | None" = None
) -> "list[ForeignKeyMetadata]":
"""Get foreign key metadata."""
schema_name = self.resolve_schema(schema)
if table is None:
self._log_schema_introspect(driver, schema_name=schema_name, table_name=None, operation="foreign_keys")
return driver.select(
self.get_query("foreign_keys_by_schema"), schema_name=schema_name, schema_type=ForeignKeyMetadata
)
self._log_table_describe(driver, schema_name=schema_name, table_name=table, operation="foreign_keys")
return driver.select(
self.get_query("foreign_keys_by_table"),
table_name=table,
schema_name=schema_name,
schema_type=ForeignKeyMetadata,
)
