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Viewing File: oracle.py
from __future__ import annotations
import re
from typing import Any
from typing import Optional
from typing import TYPE_CHECKING
from sqlalchemy.ext.compiler import compiles
from sqlalchemy.sql import sqltypes
from .base import AddColumn
from .base import alter_table
from .base import ColumnComment
from .base import ColumnDefault
from .base import ColumnName
from .base import ColumnNullable
from .base import ColumnType
from .base import format_column_name
from .base import format_server_default
from .base import format_table_name
from .base import format_type
from .base import IdentityColumnDefault
from .base import RenameTable
from .impl import DefaultImpl
if TYPE_CHECKING:
from sqlalchemy.dialects.oracle.base import OracleDDLCompiler
from sqlalchemy.engine.cursor import CursorResult
from sqlalchemy.sql.schema import Column
class OracleImpl(DefaultImpl):
__dialect__ = "oracle"
transactional_ddl = False
batch_separator = "/"
command_terminator = ""
type_synonyms = DefaultImpl.type_synonyms + (
{"VARCHAR", "VARCHAR2"},
{"BIGINT", "INTEGER", "SMALLINT", "DECIMAL", "NUMERIC", "NUMBER"},
{"DOUBLE", "FLOAT", "DOUBLE_PRECISION"},
)
identity_attrs_ignore = ()
def __init__(self, *arg, **kw) -> None:
super().__init__(*arg, **kw)
self.batch_separator = self.context_opts.get(
"oracle_batch_separator", self.batch_separator
)
def _exec(self, construct: Any, *args, **kw) -> Optional[CursorResult]:
result = super()._exec(construct, *args, **kw)
if self.as_sql and self.batch_separator:
self.static_output(self.batch_separator)
return result
def compare_server_default(
self,
inspector_column,
metadata_column,
rendered_metadata_default,
rendered_inspector_default,
):
if rendered_metadata_default is not None:
rendered_metadata_default = re.sub(
r"^\((.+)\)$", r"\1", rendered_metadata_default
)
rendered_metadata_default = re.sub(
r"^\"?'(.+)'\"?$", r"\1", rendered_metadata_default
)
if rendered_inspector_default is not None:
rendered_inspector_default = re.sub(
r"^\((.+)\)$", r"\1", rendered_inspector_default
)
rendered_inspector_default = re.sub(
r"^\"?'(.+)'\"?$", r"\1", rendered_inspector_default
)
rendered_inspector_default = rendered_inspector_default.strip()
return rendered_inspector_default != rendered_metadata_default
def emit_begin(self) -> None:
self._exec("SET TRANSACTION READ WRITE")
def emit_commit(self) -> None:
self._exec("COMMIT")
@compiles(AddColumn, "oracle")
def visit_add_column(
element: AddColumn, compiler: OracleDDLCompiler, **kw
) -> str:
return "%s %s" % (
alter_table(compiler, element.table_name, element.schema),
add_column(compiler, element.column, **kw),
)
@compiles(ColumnNullable, "oracle")
def visit_column_nullable(
element: ColumnNullable, compiler: OracleDDLCompiler, **kw
) -> str:
return "%s %s %s" % (
alter_table(compiler, element.table_name, element.schema),
alter_column(compiler, element.column_name),
"NULL" if element.nullable else "NOT NULL",
)
@compiles(ColumnType, "oracle")
def visit_column_type(
element: ColumnType, compiler: OracleDDLCompiler, **kw
) -> str:
return "%s %s %s" % (
alter_table(compiler, element.table_name, element.schema),
alter_column(compiler, element.column_name),
"%s" % format_type(compiler, element.type_),
)
@compiles(ColumnName, "oracle")
def visit_column_name(
element: ColumnName, compiler: OracleDDLCompiler, **kw
) -> str:
return "%s RENAME COLUMN %s TO %s" % (
alter_table(compiler, element.table_name, element.schema),
format_column_name(compiler, element.column_name),
format_column_name(compiler, element.newname),
)
@compiles(ColumnDefault, "oracle")
def visit_column_default(
element: ColumnDefault, compiler: OracleDDLCompiler, **kw
) -> str:
return "%s %s %s" % (
alter_table(compiler, element.table_name, element.schema),
alter_column(compiler, element.column_name),
"DEFAULT %s" % format_server_default(compiler, element.default)
if element.default is not None
else "DEFAULT NULL",
)
@compiles(ColumnComment, "oracle")
def visit_column_comment(
element: ColumnComment, compiler: OracleDDLCompiler, **kw
) -> str:
ddl = "COMMENT ON COLUMN {table_name}.{column_name} IS {comment}"
comment = compiler.sql_compiler.render_literal_value(
(element.comment if element.comment is not None else ""),
sqltypes.String(),
)
return ddl.format(
table_name=element.table_name,
column_name=element.column_name,
comment=comment,
)
@compiles(RenameTable, "oracle")
def visit_rename_table(
element: RenameTable, compiler: OracleDDLCompiler, **kw
) -> str:
return "%s RENAME TO %s" % (
alter_table(compiler, element.table_name, element.schema),
format_table_name(compiler, element.new_table_name, None),
)
def alter_column(compiler: OracleDDLCompiler, name: str) -> str:
return "MODIFY %s" % format_column_name(compiler, name)
def add_column(compiler: OracleDDLCompiler, column: Column[Any], **kw) -> str:
return "ADD %s" % compiler.get_column_specification(column, **kw)
@compiles(IdentityColumnDefault, "oracle")
def visit_identity_column(
element: IdentityColumnDefault, compiler: OracleDDLCompiler, **kw
):
text = "%s %s " % (
alter_table(compiler, element.table_name, element.schema),
alter_column(compiler, element.column_name),
)
if element.default is None:
# drop identity
text += "DROP IDENTITY"
return text
else:
text += compiler.visit_identity_column(element.default)
return text
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