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Editing: statement.py
# MySQL Connector/Python - MySQL driver written in Python. # Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved. # MySQL Connector/Python is licensed under the terms of the GPLv2 # <http://www.gnu.org/licenses/old-licenses/gpl-2.0.html>, like most # MySQL Connectors. There are special exceptions to the terms and # conditions of the GPLv2 as it is applied to this software, see the # FOSS License Exception # <http://www.mysql.com/about/legal/licensing/foss-exception.html>. # # This program is free software; you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation. # # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License # along with this program; if not, write to the Free Software # Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA """Implementation of Statements.""" import json import re from .errors import ProgrammingError from .expr import ExprParser from .compat import STRING_TYPES from .constants import Algorithms, Securities from .dbdoc import DbDoc from .protobuf import mysqlx_crud_pb2 as MySQLxCrud from .result import SqlResult, Result, ColumnType class Expr(object): def __init__(self, expr): self.expr = expr def flexible_params(*values): if len(values) == 1 and isinstance(values[0], (list, tuple,)): return values[0] return values def is_quoted_identifier(identifier, sql_mode=""): """Check if the given identifier is quoted. Args: identifier (string): Identifier to check. sql_mode (Optional[string]): SQL mode. Returns: `True` if the identifier has backtick quotes, and False otherwise. """ if "ANSI_QUOTES" in sql_mode: return ((identifier[0] == "`" and identifier[-1] == "`") or (identifier[0] == '"' and identifier[-1] == '"')) else: return identifier[0] == "`" and identifier[-1] == "`" def quote_identifier(identifier, sql_mode=""): """Quote the given identifier with backticks, converting backticks (`) in the identifier name with the correct escape sequence (``) unless the identifier is quoted (") as in sql_mode set to ANSI_QUOTES. Args: identifier (string): Identifier to quote. sql_mode (Optional[string]): SQL mode. Returns: A string with the identifier quoted with backticks. """ if is_quoted_identifier(identifier, sql_mode): return identifier if "ANSI_QUOTES" in sql_mode: return '"{0}"'.format(identifier.replace('"', '""')) else: return "`{0}`".format(identifier.replace("`", "``")) def quote_multipart_identifier(identifiers, sql_mode=""): """Quote the given multi-part identifier with backticks. Args: identifiers (iterable): List of identifiers to quote. sql_mode (Optional[string]): SQL mode. Returns: A string with the multi-part identifier quoted with backticks. """ return ".".join([quote_identifier(identifier, sql_mode) for identifier in identifiers]) def parse_table_name(default_schema, table_name, sql_mode=""): quote = '"' if "ANSI_QUOTES" in sql_mode else "`" delimiter = ".{0}".format(quote) if quote in table_name else "." temp = table_name.split(delimiter, 1) return (default_schema if len(temp) is 1 else temp[0].strip(quote), temp[-1].strip(quote),) class Statement(object): """Provides base functionality for statement objects. Args: target (object): The target database object, it can be :class:`mysqlx.Collection` or :class:`mysqlx.Table`. doc_based (bool): `True` if it is document based. """ def __init__(self, target, doc_based=True): self._target = target self._doc_based = doc_based self._connection = target._connection if target else None @property def target(self): """object: The database object target. """ return self._target @property def schema(self): """:class:`mysqlx.Schema`: The Schema object. """ return self._target.schema def execute(self): """Execute the statement. Raises: NotImplementedError: This method must be implemented. """ raise NotImplementedError class FilterableStatement(Statement): """A statement to be used with filterable statements. Args: target (object): The target database object, it can be :class:`mysqlx.Collection` or :class:`mysqlx.Table`. doc_based (Optional[bool]): `True` if it is document based (default: `True`). condition (Optional[str]): Sets the search condition to filter documents or records. """ def __init__(self, target, doc_based=True, condition=None): super(FilterableStatement, self).__init__(target=target, doc_based=doc_based) self._has_projection = False self._has_where = False self._has_limit = False self._has_sort = False self._has_group_by = False self._has_having = False self._has_bindings = False self._binding_map = {} self._bindings = [] if condition is not None: self.where(condition) def where(self, condition): """Sets the search condition to filter. Args: condition (str): Sets the search condition to filter documents or records. Returns: mysqlx.FilterableStatement: FilterableStatement object. """ self._has_where = True self._where = condition expr = ExprParser(condition, not self._doc_based) self._where_expr = expr.expr() self._binding_map = expr.placeholder_name_to_position return self def _projection(self, *fields): fields = flexible_params(*fields) self._has_projection = True self._projection_str = ",".join(fields) self._projection_expr = ExprParser(self._projection_str, not self._doc_based).parse_table_select_projection() return self def limit(self, row_count, offset=0): """Sets the maximum number of records or documents to be returned. Args: row_count (int): The maximum number of records or documents. offset (Optional[int]) The number of records or documents to skip. Returns: mysqlx.FilterableStatement: FilterableStatement object. """ self._has_limit = True self._limit_offset = offset self._limit_row_count = row_count return self def sort(self, *sort_clauses): """Sets the sorting criteria. Args: *sort_clauses: The expression strings defining the sort criteria. Returns: mysqlx.FilterableStatement: FilterableStatement object. """ sort_clauses = flexible_params(*sort_clauses) self._has_sort = True self._sort_str = ",".join(sort_clauses) self._sort_expr = ExprParser(self._sort_str, not self._doc_based).parse_order_spec() return self def _group_by(self, *fields): fields = flexible_params(*fields) self._has_group_by = True self._grouping_str = ",".join(fields) self._grouping = ExprParser(self._grouping_str, not self._doc_based).parse_expr_list() def _having(self, condition): self._has_having = True self._having = ExprParser(condition, not self._doc_based).expr() def bind(self, *args): """Binds a value to a specific placeholder. Args: *args: The name of the placeholder and the value to bind. A :class:`mysqlx.DbDoc` object or a JSON string representation can be used. Returns: mysqlx.FilterableStatement: FilterableStatement object. Raises: ProgrammingError: If the number of arguments is invalid. """ self._has_bindings = True count = len(args) if count == 1: self._bind_single(args[0]) elif count > 2: raise ProgrammingError("Invalid number of arguments to bind") else: self._bindings.append({"name": args[0], "value": args[1]}) return self def _bind_single(self, object): if isinstance(object, DbDoc): self.bind(str(object)) elif isinstance(object, STRING_TYPES): dict = json.loads(object) for key in dict.keys(): self.bind(key, dict[key]) def execute(self): """Execute the statement. Raises: NotImplementedError: This method must be implemented. """ raise NotImplementedError class SqlStatement(Statement): """A statement for SQL execution. Args: connection (mysqlx.connection.Connection): Connection object. sql (string): The sql statement to be executed. """ def __init__(self, connection, sql): super(SqlStatement, self).__init__(target=None, doc_based=False) self._connection = connection self._sql = sql def execute(self): """Execute the statement. Returns: mysqlx.SqlResult: SqlResult object. """ self._connection.send_sql(self._sql) return SqlResult(self._connection) class AddStatement(Statement): """A statement for document addition on a collection. Args: collection (mysqlx.Collection): The Collection object. """ def __init__(self, collection): super(AddStatement, self).__init__(target=collection) self._values = [] self._ids = [] def add(self, *values): """Adds a list of documents into a collection. Args: *values: The documents to be added into the collection. Returns: mysqlx.AddStatement: AddStatement object. """ for val in flexible_params(*values): if isinstance(val, DbDoc): self._values.append(val) else: self._values.append(DbDoc(val)) return self def execute(self): """Execute the statement. Returns: mysqlx.Result: Result object. """ if len(self._values) == 0: return Result() for doc in self._values: self._ids.append(doc.ensure_id()) return self._connection.send_insert(self) class UpdateSpec(object): def __init__(self, update_type, source, value=None): if update_type == MySQLxCrud.UpdateOperation.SET: self._table_set(source, value) else: self.update_type = update_type self.source = source if len(source) > 0 and source[0] == '$': self.source = source[1:] self.source = ExprParser(self.source, False).document_field().identifier self.value = value def _table_set(self, source, value): self.update_type = MySQLxCrud.UpdateOperation.SET self.source = ExprParser(source, True).parse_table_update_field() self.value = value class ModifyStatement(FilterableStatement): """A statement for document update operations on a Collection. Args: collection (mysqlx.Collection): The Collection object. condition (Optional[str]): Sets the search condition to identify the documents to be updated. """ def __init__(self, collection, condition=None): super(ModifyStatement, self).__init__(target=collection, condition=condition) self._update_ops = [] def set(self, doc_path, value): """Sets or updates attributes on documents in a collection. Args: doc_path (string): The document path of the item to be set. value (string): The value to be set on the specified attribute. Returns: mysqlx.ModifyStatement: ModifyStatement object. """ self._update_ops.append( UpdateSpec(MySQLxCrud.UpdateOperation.ITEM_SET, doc_path, value)) return self def change(self, doc_path, value): """Add an update to the statement setting the field, if it exists at the document path, to the given value. Args: doc_path (string): The document path of the item to be set. value (object): The value to be set on the specified attribute. Returns: mysqlx.ModifyStatement: ModifyStatement object. """ self._update_ops.append( UpdateSpec(MySQLxCrud.UpdateOperation.ITEM_REPLACE, doc_path, value)) return self def unset(self, *doc_paths): """Removes attributes from documents in a collection. Args: doc_path (string): The document path of the attribute to be removed. Returns: mysqlx.ModifyStatement: ModifyStatement object. """ self._update_ops.extend([ UpdateSpec(MySQLxCrud.UpdateOperation.ITEM_REMOVE, x) for x in flexible_params(*doc_paths)]) return self def array_insert(self, field, value): """Insert a value into the specified array in documents of a collection. Args: field (string): A document path that identifies the array attribute and position where the value will be inserted. value (object): The value to be inserted. Returns: mysqlx.ModifyStatement: ModifyStatement object. """ self._update_ops.append( UpdateSpec(MySQLxCrud.UpdateOperation.ARRAY_INSERT, field, value)) return self def array_append(self, doc_path, value): """Inserts a value into a specific position in an array attribute in documents of a collection. Args: doc_path (string): A document path that identifies the array attribute and position where the value will be inserted. value (object): The value to be inserted. Returns: mysqlx.ModifyStatement: ModifyStatement object. """ self._update_ops.append( UpdateSpec(MySQLxCrud.UpdateOperation.ARRAY_APPEND, doc_path, value)) return self def execute(self): """Execute the statement. Returns: mysqlx.Result: Result object. """ return self._connection.update(self) class FindStatement(FilterableStatement): """A statement document selection on a Collection. Args: collection (mysqlx.Collection): The Collection object. condition (Optional[str]): An optional expression to identify the documents to be retrieved. If not specified all the documents will be included on the result unless a limit is set. """ def __init__(self, collection, condition=None): super(FindStatement, self).__init__(collection, True, condition) def fields(self, *fields): """Sets a document field filter. Args: *fields: The string expressions identifying the fields to be extracted. Returns: mysqlx.FindStatement: FindStatement object. """ return self._projection(*fields) def group_by(self, *fields): """Sets a grouping criteria for the resultset. Args: *fields: The string expressions identifying the grouping criteria. Returns: mysqlx.FindStatement: FindStatement object. """ self._group_by(*fields) return self def having(self, condition): """Sets a condition for records to be considered in agregate function operations. Args: condition (string): A condition on the agregate functions used on the grouping criteria. Returns: mysqlx.FindStatement: FindStatement object. """ self._having(condition) return self def execute(self): """Execute the statement. Returns: mysqlx.DocResult: DocResult object. """ return self._connection.find(self) class SelectStatement(FilterableStatement): """A statement for record retrieval operations on a Table. Args: table (mysqlx.Table): The Table object. *fields: The fields to be retrieved. """ def __init__(self, table, *fields): super(SelectStatement, self).__init__(table, False) self._projection(*fields) def group_by(self, *fields): """Sets a grouping criteria for the resultset. Args: *fields: The fields identifying the grouping criteria. Returns: mysqlx.SelectStatement: SelectStatement object. """ self._group_by(*fields) return self def having(self, condition): """Sets a condition for records to be considered in agregate function operations. Args: condition (str): A condition on the agregate functions used on the grouping criteria. Returns: mysqlx.SelectStatement: SelectStatement object. """ self._having(condition) return self def execute(self): """Execute the statement. Returns: mysqlx.RowResult: RowResult object. """ return self._connection.find(self) def get_sql(self): where = " WHERE {0}".format(self._where) if self._has_where else "" group_by = " GROUP BY {0}".format(self._grouping_str) if \ self._has_group_by else "" having = " HAVING {0}".format(self._having) if self._has_having else "" order_by = " ORDER BY {0}".format(self._sort_str) if self._has_sort \ else "" limit = " LIMIT {0} OFFSET {1}".format(self._limit_row_count, self._limit_offset) if self._has_limit else "" stmt = ("SELECT {select} FROM {schema}.{table}{where}{group}{having}" "{order}{limit}".format( select=getattr(self, '_projection_str', "*"), schema=self.schema.name, table=self.target.name, limit=limit, where=where, group=group_by, having=having, order=order_by)) return stmt class InsertStatement(Statement): """A statement for insert operations on Table. Args: table (mysqlx.Table): The Table object. *fields: The fields to be inserted. """ def __init__(self, table, *fields): super(InsertStatement, self).__init__(target=table, doc_based=False) self._fields = flexible_params(*fields) self._values = [] def values(self, *values): """Set the values to be inserted. Args: *values: The values of the columns to be inserted. Returns: mysqlx.InsertStatement: InsertStatement object. """ self._values.append(list(flexible_params(*values))) return self def execute(self): """Execute the statement. Returns: mysqlx.Result: Result object. """ return self._connection.send_insert(self) class UpdateStatement(FilterableStatement): """A statement for record update operations on a Table. Args: table (mysqlx.Table): The Table object. *fields: The fields to be updated. """ def __init__(self, table, *fields): super(UpdateStatement, self).__init__(target=table, doc_based=False) self._update_ops = [] def set(self, field, value): """Updates the column value on records in a table. Args: field (string): The column name to be updated. value (object): The value to be set on the specified column. Returns: mysqlx.UpdateStatement: UpdateStatement object. """ self._update_ops.append( UpdateSpec(MySQLxCrud.UpdateOperation.SET, field, value)) return self def execute(self): """Execute the statement. Returns: mysqlx.Result: Result object """ return self._connection.update(self) class RemoveStatement(FilterableStatement): """A statement for document removal from a collection. Args: collection (mysqlx.Collection): The Collection object. """ def __init__(self, collection): super(RemoveStatement, self).__init__(target=collection) def execute(self): """Execute the statement. Returns: mysqlx.Result: Result object. """ return self._connection.delete(self) class DeleteStatement(FilterableStatement): """A statement that drops a table. Args: table (mysqlx.Table): The Table object. condition (Optional[str]): The string with the filter expression of the rows to be deleted. """ def __init__(self, table, condition=None): super(DeleteStatement, self).__init__(target=table, condition=condition, doc_based=False) def execute(self): """Execute the statement. Returns: mysqlx.Result: Result object. """ return self._connection.delete(self) class CreateCollectionIndexStatement(Statement): """A statement that creates an index on a collection. Args: collection (mysqlx.Collection): Collection. index_name (string): Index name. is_unique (bool): `True` if the index is unique. """ def __init__(self, collection, index_name, is_unique): super(CreateCollectionIndexStatement, self).__init__(target=collection) self._index_name = index_name self._is_unique = is_unique self._fields = [] def field(self, document_path, column_type, is_required): """Add the field specification to this index creation statement. Args: document_path (string): The document path. column_type (string): The column type. is_required (bool): `True` if the field is required. Returns: mysqlx.CreateCollectionIndexStatement: \ CreateCollectionIndexStatement object. """ self._fields.append((document_path, column_type, is_required,)) return self def execute(self): """Execute the statement. Returns: mysqlx.Result: Result object. """ fields = [item for sublist in self._fields for item in sublist] return self._connection.execute_nonquery( "xplugin", "create_collection_index", True, self._target.schema.name, self._target.name, self._index_name, self._is_unique, *fields) class DropCollectionIndexStatement(Statement): """A statement that drops an index on a collection. Args: collection (mysqlx.Collection): The Collection object. index_name (string): The index name. """ def __init__(self, collection, index_name): super(DropCollectionIndexStatement, self).__init__(target=collection) self._index_name = index_name def execute(self): """Execute the statement. Returns: mysqlx.Result: Result object. """ return self._connection.execute_nonquery( "xplugin", "drop_collection_index", True, self._target.schema.name, self._target.name, self._index_name) class TableIndex(object): UNIQUE_INDEX = 1 INDEX = 2 def __init__(self, name, index_type, columns): self._name = name self._index_type = index_type self._columns = columns def get_sql(self): stmt = "" if self._index_type is TableIndex.UNIQUE_INDEX: stmt += "UNIQUE " stmt += "INDEX {0} ({1})" return stmt.format(self._name, ",".join(self._columns)) class CreateViewStatement(Statement): """A statement for creating views. Args: view (mysqlx.View): The View object. replace (Optional[bool]): `True` to add replace. """ def __init__(self, view, replace=False): super(CreateViewStatement, self).__init__(target=view, doc_based=False) self._view = view self._schema = view.schema self._name = view.name self._replace = replace self._columns = [] self._algorithm = Algorithms.UNDEFINED self._security = Securities.DEFINER self._definer = None self._defined_as = None self._check_option = None def columns(self, columns): """Sets the column names. Args: columns (list): The list of column names. Returns: mysqlx.CreateViewStatement: CreateViewStatement object. """ self._columns = [quote_identifier(col) for col in columns] return self def algorithm(self, algorithm): """Sets the algorithm. Args: mysqlx.constants.ALGORITHMS: The algorithm. Returns: mysqlx.CreateViewStatement: CreateViewStatement object. """ self._algorithm = algorithm return self def security(self, security): """Sets the SQL security mode. Args: mysqlx.constants.SECURITIES: The SQL security mode. Returns: mysqlx.CreateViewStatement: CreateViewStatement object. """ self._security = security return self def definer(self, definer): """Sets the definer. Args: definer (string): The definer. Returns: mysqlx.CreateViewStatement: CreateViewStatement object. """ self._definer = definer return self def defined_as(self, statement): """Sets the SelectStatement statement for describing the view. Args: mysqlx.SelectStatement: SelectStatement object. Returns: mysqlx.CreateViewStatement: CreateViewStatement object. """ self._defined_as = statement return self def with_check_option(self, check_option): """Sets the check option. Args: mysqlx.constants.CHECK_OPTIONS: The check option. Returns: mysqlx.CreateViewStatement: CreateViewStatement object. """ self._check_option = check_option return self def execute(self): """Execute the statement to create a view. Returns: mysqlx.View: View object. """ replace = " OR REPLACE" if self._replace else "" definer = " DEFINER = {0}".format(self._definer) \ if self._definer else "" columns = " ({0})".format(", ".join(self._columns)) \ if self._columns else "" view_name = quote_multipart_identifier((self._schema.name, self._name)) check_option = " WITH {0} CHECK OPTION".format(self._check_option) \ if self._check_option else "" sql = ("CREATE{replace} ALGORITHM = {algorithm}{definer} " "SQL SECURITY {security} VIEW {view_name}{columns} " "AS {defined_as}{check_option}" "".format(replace=replace, algorithm=self._algorithm, definer=definer, security=self._security, view_name=view_name, columns=columns, defined_as=self._defined_as, check_option=check_option)) self._connection.execute_nonquery("sql", sql) return self._view class AlterViewStatement(CreateViewStatement): """A statement for alter views. Args: view (mysqlx.View): The View object. """ def __init__(self, view): super(AlterViewStatement, self).__init__(view) def execute(self): """Execute the statement to alter a view. Returns: mysqlx.View: View object. """ definer = " DEFINER = {0}".format(self._definer) \ if self._definer else "" columns = " ({0})".format(", ".join(self._columns)) \ if self._columns else "" view_name = quote_multipart_identifier((self._schema.name, self._name)) check_option = " WITH {0} CHECK OPTION".format(self._check_option) \ if self._check_option else "" sql = ("ALTER ALGORITHM = {algorithm}{definer} " "SQL SECURITY {security} VIEW {view_name}{columns} " "AS {defined_as}{check_option}" "".format(algorithm=self._algorithm, definer=definer, security=self._security, view_name=view_name, columns=columns, defined_as=self._defined_as, check_option=check_option)) self._connection.execute_nonquery("sql", sql) return self._view class CreateTableStatement(Statement): """A statement that creates a new table if it doesn't exist already. Args: collection (mysqlx.Schema): The Schema object. table_name (string): The name for the new table. """ tbl_frmt = re.compile(r"(from\s+)([`\"].+[`\"]|[^\.]+)(\s|$)", re.IGNORECASE) def __init__(self, schema, table_name): super(CreateTableStatement, self).__init__(schema) self._charset = None self._collation = None self._comment = None self._as = None self._like = None self._temp = False self._columns = [] self._f_keys = [] self._indices = [] self._p_keys = [] self._u_indices = [] self._auto_inc = 0 self._name = table_name self._tbl_repl = r"\1{0}.\2\3".format(self.schema.get_name()) @property def table_name(self): """string: The fully qualified name of the Table. """ return quote_multipart_identifier(parse_table_name( self.schema.name, self._name)) def _get_table_opts(self): options = [] options.append("AUTO_INCREMENT = {inc}") if self._charset: options.append("DEFAULT CHARACTER SET = {charset}") if self._collation: options.append("DEFAULT COLLATE = {collation}") if self._comment: options.append("COMMENT = '{comment}'") table_opts = ",".join(options) return table_opts.format(inc=self._auto_inc, charset=self._charset, collation=self._collation, comment=self._comment) def _get_create_def(self): defs = [] if self._p_keys: defs.append("PRIMARY KEY ({0})".format(",".join(self._p_keys))) for col in self._columns: defs.append(col.get_sql()) for key in self._f_keys: defs.append(key.get_sql()) for index in self._indices: defs.append(index.get_sql()) for index in self._u_indices: defs.append(index.get_sql()) return ",".join(defs) def like(self, table_name): """Create table with the definition of another existing Table. Args: table_name (string): Name of the source table. Returns: mysqlx.CreateTableStatement: CreateTableStatement object. """ self._like = quote_multipart_identifier( parse_table_name(self.schema.name, table_name)) return self def as_select(self, select): """Create the Table and fill it with values from a Select Statement. Args: select (object): Select Statement. Can be a string or an instance of :class`mysqlx.SelectStatement`. Returns: mysqlx.CreateTableStatement: CreateTableStatement object. """ if isinstance(select, STRING_TYPES): self._as = CreateTableStatement.tbl_frmt.sub(self._tbl_repl, select) elif isinstance(select, SelectStatement): self._as = select.get_sql() return self def add_column(self, column_def): """Add a Column to the Table. Args: column_def (MySQLx.ColumnDef): Column Definition object. Returns: mysqlx.CreateTableStatement: CreateTableStatement object. """ column_def.set_schema(self.schema.get_name()) self._columns.append(column_def) return self def add_primary_key(self, *keys): """Add multiple Primary Keys to the Table. Args: *keys: Fields to be used as Primary Keys. Returns: mysqlx.CreateTableStatement: CreateTableStatement object. """ keys = flexible_params(*keys) self._p_keys.extend(keys) return self def add_index(self, index_name, *cols): """Adds an Index to the Table. Args: index_name (string): Name of the Index. *cols: Fields to be used as an Index. Returns: mysqlx.CreateTableStatement: CreateTableStatement object. """ self._indices.append(TableIndex(index_name, TableIndex.INDEX, flexible_params(*cols))) return self def add_unique_index(self, index_name, *cols): """Adds a Unique Index to the Table. Args: index_name (string): Name of the Unique Index. *cols: Fields to be used as a Unique Index. Returns: mysqlx.CreateTableStatement: CreateTableStatement object. """ self._u_indices.append(TableIndex(index_name, TableIndex.UNIQUE_INDEX, flexible_params(*cols))) return self def add_foreign_key(self, name, key): """Adds a Foreign Key to the Table. Args: key (MySQLx.ForeignKeyDef): The Foreign Key Definition object. Returns: mysqlx.CreateTableStatement: CreateTableStatement object. """ key.set_schema(self.schema.get_name()) key.set_name(name) self._f_keys.append(key) return self def set_initial_auto_increment(self, inc): """Set the initial Auto Increment value for the table. Args: inc (int): The initial AUTO_INCREMENT value for the table. Returns: mysqlx.CreateTableStatement: CreateTableStatement object. """ self._auto_inc = inc return self def set_default_charset(self, charset): """Sets the default Charset type for the Table. Args: charset (string): Charset type. Returns: mysqlx.CreateTableStatement: CreateTableStatement object. """ self._charset = charset return self def set_default_collation(self, collation): """Sets the default Collation type for the Table. Args: collation (string): Collation type. Returns: mysqlx.CreateTableStatement: CreateTableStatement object. """ self._collation = collation return self def set_comment(self, comment): """Add a comment to the Table. Args: comment (string): Comment to be added to the Table. Returns: mysqlx.CreateTableStatement: CreateTableStatement object. """ self._comment = comment return self def temporary(self): """Set the Table to be Temporary. Returns: mysqlx.CreateTableStatement: CreateTableStatement object. """ self._temp = True return self def execute(self): """Execute the statement. Returns: mysqlx.Table: Table object. """ create = "CREATE {table_type} {name}".format(name=self.table_name, table_type="TEMPORARY TABLE" if self._temp else "TABLE") if self._like: stmt = "{create} LIKE {query}" else: stmt = "{create} ({create_def}) {table_opts} {query}" stmt = stmt.format( create=create, query=self._like or self._as or "", create_def=self._get_create_def(), table_opts=self._get_table_opts()) self._connection.execute_nonquery("sql", stmt, False) return self.schema.get_table(self._name) class ColumnDefBase(object): """A Base class defining the basic parameters required to define a column. Args: name (string): Name of the column. type (MySQLx.ColumnType): Type of the column. size (int): Size of the column. """ def __init__(self, name, type, size): self._default_schema = None self._not_null = False self._p_key = False self._u_index = False self._name = name self._size = size self._comment = "" self._type = type def not_null(self): """Disable NULL values for this column. Returns: mysqlx.ColumnDefBase: ColumnDefBase object. """ self._not_null = True return self def unique_index(self): """Set current column as a Unique Index. Returns: mysqlx.ColumnDefBase: ColumnDefBase object. """ self._u_index = True return self def comment(self, comment): """Add a comment to the column. Args: comment (string): Comment to be added to the column. Returns: mysqlx.ColumnDefBase: ColumnDefBase object. """ self._comment = comment return self def primary(self): """Sets the Column as a Primary Key. Returns: mysqlx.ColumnDefBase: ColumnDefBase object. """ self._p_key = True return self def set_schema(self, schema): self._default_schema = schema class ColumnDef(ColumnDefBase): """Class containing the complete definition of the Column. Args: name (string): Name of the column. type (MySQL.ColumnType): Type of the column. size (int): Size of the column. """ def __init__(self, name, type, size=None): super(ColumnDef, self).__init__(name, type, size) self._ref = None self._default = None self._decimals = None self._ref_table = None self._binary = False self._auto_inc = False self._unsigned = False self._values = [] self._ref_fields = [] self._charset = None self._collation = None def _data_type(self): type_def = "" if self._size and (ColumnType.is_numeric(self._type) or \ ColumnType.is_char(self._type) or ColumnType.is_binary(self._type)): type_def = "({0})".format(self._size) elif ColumnType.is_decimals(self._type) and self._size: type_def = "({0}, {1})".format(self._size, self._decimals or 0) elif ColumnType.is_finite_set(self._type): type_def = "({0})".format(",".join(self._values)) if self._unsigned: type_def = "{0} UNSIGNED".format(type_def) if self._binary: type_def = "{0} BINARY".format(type_def) if self._charset: type_def = "{0} CHARACTER SET {1}".format(type_def, self._charset) if self._collation: type_def = "{0} COLLATE {1}".format(type_def, self._collation) return "{0} {1}".format(ColumnType.to_string(self._type), type_def) def _col_definition(self): null = " NOT NULL" if self._not_null else " NULL" auto_inc = " AUTO_INCREMENT" if self._auto_inc else "" default = " DEFAULT {default}" if self._default else "" comment = " COMMENT '{comment}'" if self._comment else "" defn = "{0}{1}{2}{3}{4}".format(self._data_type(), null, default, auto_inc, comment) if self._p_key: defn = "{0} PRIMARY KEY".format(defn) elif self._u_index: defn = "{0} UNIQUE KEY".format(defn) if self._ref_table and self._ref_fields: ref_table = quote_multipart_identifier(parse_table_name( self._default_schema, self._ref_table)) defn = "{0} REFERENCES {1} ({2})".format(defn, ref_table, ",".join(self._ref_fields)) return defn.format(default=self._default, comment=self._comment) def set_default(self, default_val): """Sets the default value of this Column. Args: default_val (object): The default value of the Column. Can be a string, number or :class`MySQLx.Expr`. Returns: mysqlx.ColumnDef: ColumnDef object. """ if isinstance(default_val, Expr): self._default = default_val.expr elif default_val is None: self._default = "NULL" else: self._default = repr(default_val) return self def auto_increment(self): """Set the Column to Auto Increment. Returns: mysqlx.ColumnDef: ColumnDef object. """ self._auto_inc = True return self def foreign_key(self, name, *refs): """Sets the Column as a Foreign Key. Args: name (string): Name of the referenced Table. *refs: Fields this Column references. Returns: mysqlx.ColumnDef: ColumnDef object. """ self._ref_fields = flexible_params(*refs) self._ref_table = name return self def unsigned(self): """Set the Column as unsigned. Returns: mysqlx.ColumnDef: ColumnDef object. """ self._unsigned = True return self def decimals(self, size): """Set the size of the decimal Column. Args: size (int): Size of the decimal. Returns: mysqlx.ColumnDef: ColumnDef object. """ self._decimals = size return self def charset(self, charset): """Set the Charset type of the Column. Args: charset (string): Charset type. Returns: mysqlx.ColumnDef: ColumnDef object. """ self._charset = charset return self def collation(self, collation): """Set the Collation type of the Column. Args: collation (string): Collation type. Returns: mysqlx.ColumnDef: ColumnDef object. """ self._collation = collation return self def binary(self): """Set the current column to binary type. Returns: mysqlx.ColumnDef: ColumnDef object. """ self._binary = True return self def values(self, *values): """Set the Enum/Set values. Args: *values: Values for Enum/Set type Column. Returns: mysqlx.ColumnDef: ColumnDef object. """ self._values = map(repr, flexible_params(*values)) return self def get_sql(self): return "{0} {1}".format(self._name, self._col_definition()) class GeneratedColumnDef(ColumnDef): """Class used to describe a Generated Column. Args: name: Name of the column. col_type: Type of the column. expr: The Expression used to generate the value of this column. """ def __init__(self, name, col_type, expr): super(GeneratedColumnDef, self).__init__(name, col_type) assert isinstance(expr, Expr) self._stored = False self._expr = expr.expr def stored(self): """Set the Generated Column to be stored. Returns: mysqlx.GeneratedColumnDef: GeneratedColumnDef object. """ self._stored = True return self def get_sql(self): return "{0} GENERATED ALWAYS AS ({1}){2}".format( super(GeneratedColumnDef, self).get_sql(), self._expr, " STORED" if self._stored else "") class ForeignKeyDef(object): """Class describing a Foreign Key.""" NO_ACTION = 1 RESTRICT = 2 CASCADE = 3 SET_NULL = 4 def __init__(self): self._fields = [] self._f_fields = [] self._name = None self._f_table = None self._default_schema = None self._update_action = self._action(ForeignKeyDef.NO_ACTION) self._delete_action = self._action(ForeignKeyDef.NO_ACTION) def _action(self, action): if action is ForeignKeyDef.RESTRICT: return "RESTRICT" elif action is ForeignKeyDef.CASCADE: return "CASCADE" elif action is ForeignKeyDef.SET_NULL: return "SET NULL" return "NO ACTION" def set_name(self, name): self._name = name def set_schema(self, schema): self._default_schema = schema def fields(self, *fields): """Add a list of fields in the parent table. Args: *fields: Fields in the given table which constitute the Foreign Key. Returns: mysqlx.ForeignKeyDef: ForeignKeyDef object. """ self._fields = flexible_params(*fields) return self def refers_to(self, name, *refs): """Add the child table name and the fields. Args: name (string): Name of the referenced table. *refs: A list fields in the referenced table. Returns: mysqlx.ForeignKeyDef: ForeignKeyDef object. """ self._f_fields = flexible_params(*refs) self._f_table = name return self def on_update(self, action): """Define the action on updating a Foreign Key. Args: action (int): Action to be performed on updating the reference. Can be any of the following values: 1. ForeignKeyDef.NO_ACTION 2. ForeignKeyDef.RESTRICT 3. ForeignKeyDef.CASCADE 4. ForeignKeyDef.SET_NULL Returns: mysqlx.ForeignKeyDef: ForeignKeyDef object. """ self._update_action = self._action(action) return self def on_delete(self, action): """Define the action on deleting a Foreign Key. Args: action (int): Action to be performed on updating the reference. Can be any of the following values: 1. ForeignKeyDef.NO_ACTION 2. ForeignKeyDef.RESTRICT 3. ForeignKeyDef.CASCADE 4. ForeignKeyDef.SET_NULL Returns: mysqlx.ForeignKeyDef: ForeignKeyDef object. """ self._delete_action = self._action(action) return self def get_sql(self): update = "ON UPDATE {0}".format(self._update_action) delete = "ON DELETE {0}".format(self._delete_action) key = "FOREIGN KEY {0}({1}) REFERENCES {2} ({3})".format( self._name, ",".join(self._fields), quote_multipart_identifier( parse_table_name(self._default_schema, self._f_table)), ",".join(self._f_fields)) return "{0} {1} {2}".format(key, update, delete)
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