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Mini Shell
from typing import TYPE_CHECKING
from sqlalchemy import schema as sa_schema
from . import ops
from .base import Operations
from ..util.sqla_compat import _copy
if TYPE_CHECKING:
from sqlalchemy.sql.schema import Table
@Operations.implementation_for(ops.AlterColumnOp)
def alter_column(
operations: "Operations", operation: "ops.AlterColumnOp"
) -> None:
compiler = operations.impl.dialect.statement_compiler(
operations.impl.dialect, None
)
existing_type = operation.existing_type
existing_nullable = operation.existing_nullable
existing_server_default = operation.existing_server_default
type_ = operation.modify_type
column_name = operation.column_name
table_name = operation.table_name
schema = operation.schema
server_default = operation.modify_server_default
new_column_name = operation.modify_name
nullable = operation.modify_nullable
comment = operation.modify_comment
existing_comment = operation.existing_comment
def _count_constraint(constraint):
return not isinstance(constraint, sa_schema.PrimaryKeyConstraint) and (
not constraint._create_rule or constraint._create_rule(compiler)
)
if existing_type and type_:
t = operations.schema_obj.table(
table_name,
sa_schema.Column(column_name, existing_type),
schema=schema,
)
for constraint in t.constraints:
if _count_constraint(constraint):
operations.impl.drop_constraint(constraint)
operations.impl.alter_column(
table_name,
column_name,
nullable=nullable,
server_default=server_default,
name=new_column_name,
type_=type_,
schema=schema,
existing_type=existing_type,
existing_server_default=existing_server_default,
existing_nullable=existing_nullable,
comment=comment,
existing_comment=existing_comment,
**operation.kw
)
if type_:
t = operations.schema_obj.table(
table_name,
operations.schema_obj.column(column_name, type_),
schema=schema,
)
for constraint in t.constraints:
if _count_constraint(constraint):
operations.impl.add_constraint(constraint)
@Operations.implementation_for(ops.DropTableOp)
def drop_table(operations: "Operations", operation: "ops.DropTableOp") -> None:
operations.impl.drop_table(
operation.to_table(operations.migration_context)
)
@Operations.implementation_for(ops.DropColumnOp)
def drop_column(
operations: "Operations", operation: "ops.DropColumnOp"
) -> None:
column = operation.to_column(operations.migration_context)
operations.impl.drop_column(
operation.table_name, column, schema=operation.schema, **operation.kw
)
@Operations.implementation_for(ops.CreateIndexOp)
def create_index(
operations: "Operations", operation: "ops.CreateIndexOp"
) -> None:
idx = operation.to_index(operations.migration_context)
operations.impl.create_index(idx)
@Operations.implementation_for(ops.DropIndexOp)
def drop_index(operations: "Operations", operation: "ops.DropIndexOp") -> None:
operations.impl.drop_index(
operation.to_index(operations.migration_context)
)
@Operations.implementation_for(ops.CreateTableOp)
def create_table(
operations: "Operations", operation: "ops.CreateTableOp"
) -> "Table":
table = operation.to_table(operations.migration_context)
operations.impl.create_table(table)
return table
@Operations.implementation_for(ops.RenameTableOp)
def rename_table(
operations: "Operations", operation: "ops.RenameTableOp"
) -> None:
operations.impl.rename_table(
operation.table_name, operation.new_table_name, schema=operation.schema
)
@Operations.implementation_for(ops.CreateTableCommentOp)
def create_table_comment(
operations: "Operations", operation: "ops.CreateTableCommentOp"
) -> None:
table = operation.to_table(operations.migration_context)
operations.impl.create_table_comment(table)
@Operations.implementation_for(ops.DropTableCommentOp)
def drop_table_comment(
operations: "Operations", operation: "ops.DropTableCommentOp"
) -> None:
table = operation.to_table(operations.migration_context)
operations.impl.drop_table_comment(table)
@Operations.implementation_for(ops.AddColumnOp)
def add_column(operations: "Operations", operation: "ops.AddColumnOp") -> None:
table_name = operation.table_name
column = operation.column
schema = operation.schema
kw = operation.kw
if column.table is not None:
column = _copy(column)
t = operations.schema_obj.table(table_name, column, schema=schema)
operations.impl.add_column(table_name, column, schema=schema, **kw)
for constraint in t.constraints:
if not isinstance(constraint, sa_schema.PrimaryKeyConstraint):
operations.impl.add_constraint(constraint)
for index in t.indexes:
operations.impl.create_index(index)
with_comment = (
operations.impl.dialect.supports_comments
and not operations.impl.dialect.inline_comments
)
comment = column.comment
if comment and with_comment:
operations.impl.create_column_comment(column)
@Operations.implementation_for(ops.AddConstraintOp)
def create_constraint(
operations: "Operations", operation: "ops.AddConstraintOp"
) -> None:
operations.impl.add_constraint(
operation.to_constraint(operations.migration_context)
)
@Operations.implementation_for(ops.DropConstraintOp)
def drop_constraint(
operations: "Operations", operation: "ops.DropConstraintOp"
) -> None:
operations.impl.drop_constraint(
operations.schema_obj.generic_constraint(
operation.constraint_name,
operation.table_name,
operation.constraint_type,
schema=operation.schema,
)
)
@Operations.implementation_for(ops.BulkInsertOp)
def bulk_insert(
operations: "Operations", operation: "ops.BulkInsertOp"
) -> None:
operations.impl.bulk_insert( # type: ignore[union-attr]
operation.table, operation.rows, multiinsert=operation.multiinsert
)
@Operations.implementation_for(ops.ExecuteSQLOp)
def execute_sql(
operations: "Operations", operation: "ops.ExecuteSQLOp"
) -> None:
operations.migration_context.impl.execute(
operation.sqltext, execution_options=operation.execution_options
)
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