/
_func.py
161 lines (131 loc) · 4.82 KB
/
_func.py
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# encoding: utf-8
"""
.. codeauthor:: Tsuyoshi Hombashi <tsuyoshi.hombashi@gmail.com>
"""
from __future__ import absolute_import, unicode_literals
from textwrap import dedent
from pathvalidate import (
InvalidCharError,
InvalidReservedNameError,
NullNameError,
ValidReservedNameError,
)
from ._common import extract_table_metadata
from ._logger import logger
from ._validator import validate_sqlite_attr_name, validate_sqlite_table_name
from .error import NameValidationError
def validate_table_name(name):
"""
:param str name: Table name to validate.
:raises NameValidationError: |raises_validate_table_name|
"""
try:
validate_sqlite_table_name(name)
except (InvalidCharError, InvalidReservedNameError) as e:
raise NameValidationError(e)
except NullNameError:
raise NameValidationError("table name is empty")
except ValidReservedNameError:
pass
def validate_attr_name(name):
"""
:param str name: Name to validate.
:raises NameValidationError: |raises_validate_attr_name|
"""
try:
validate_sqlite_attr_name(name)
except (InvalidCharError, InvalidReservedNameError) as e:
raise NameValidationError(e)
except NullNameError:
raise NameValidationError("attribute name is empty")
def append_table(src_con, dst_con, table_name):
"""
Append a table from source database to destination database.
:param SimpleSQLite src_con: Connection to the source database.
:param SimpleSQLite dst_con: Connection to the destination database.
:param str table_name: Table name to append.
:return: |True| if the append operation succeed.
:rtype: bool
:raises simplesqlite.TableNotFoundError:
|raises_verify_table_existence|
:raises ValueError:
If attributes of the table are different from each other.
"""
logger.debug(
"append table: src={src_db}.{src_tbl}, dst={dst_db}.{dst_tbl}".format(
src_db=src_con.database_path,
src_tbl=table_name,
dst_db=dst_con.database_path,
dst_tbl=table_name,
)
)
src_con.verify_table_existence(table_name)
dst_con.validate_access_permission(["w", "a"])
if dst_con.has_table(table_name):
src_attrs = src_con.fetch_attr_names(table_name)
dst_attrs = dst_con.fetch_attr_names(table_name)
if src_attrs != dst_attrs:
raise ValueError(
dedent(
"""
source and destination attribute is different from each other
src: {}
dst: {}
""".format(
src_attrs, dst_attrs
)
)
)
primary_key, index_attrs, type_hints = extract_table_metadata(src_con, table_name)
dst_con.create_table_from_tabledata(
src_con.select_as_tabledata(table_name, type_hints=type_hints),
primary_key=primary_key,
index_attrs=index_attrs,
)
return True
def copy_table(src_con, dst_con, src_table_name, dst_table_name, is_overwrite=True):
"""
Copy a table from source to destination.
:param SimpleSQLite src_con: Connection to the source database.
:param SimpleSQLite dst_con: Connection to the destination database.
:param str src_table_name: Source table name to copy.
:param str dst_table_name: Destination table name.
:param bool is_overwrite: If |True|, overwrite existing table.
:return: |True| if the copy operation succeed.
:rtype: bool
:raises simplesqlite.TableNotFoundError:
|raises_verify_table_existence|
:raises ValueError:
If attributes of the table are different from each other.
"""
logger.debug(
"copy table: src={src_db}.{src_tbl}, dst={dst_db}.{dst_tbl}".format(
src_db=src_con.database_path,
src_tbl=src_table_name,
dst_db=dst_con.database_path,
dst_tbl=dst_table_name,
)
)
src_con.verify_table_existence(src_table_name)
dst_con.validate_access_permission(["w", "a"])
if dst_con.has_table(dst_table_name):
if is_overwrite:
dst_con.drop_table(dst_table_name)
else:
logger.error(
"failed to copy table: the table already exists "
"(src_table={}, dst_table={})".format(src_table_name, dst_table_name)
)
return False
primary_key, index_attrs, _ = extract_table_metadata(src_con, src_table_name)
result = src_con.select(select="*", table_name=src_table_name)
if result is None:
return False
dst_con.create_table_from_data_matrix(
dst_table_name,
src_con.fetch_attr_names(src_table_name),
result.fetchall(),
primary_key=primary_key,
index_attrs=index_attrs,
)
return True