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# 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 from .protobuf.mysqlx_datatypes_pb2 import * from .protobuf.mysqlx_expr_pb2 import * def escape_literal(string): return string.replace('"', '""') def scalar_to_string(s): if s.type == Scalar.V_SINT: return str(s.v_signed_int) elif s.type == Scalar.V_DOUBLE: return str(s.v_double) elif s.type == Scalar.V_BOOL: if s.v_bool: return "TRUE" else: return "FALSE" elif s.type == Scalar.V_STRING: return '"{0}"'.format(escape_literal(s.v_string.value)) elif s.type == Scalar.V_NULL: return "NULL" else: raise ValueError("Unknown type tag: {0}".format(s.type)) def column_identifier_to_string(id): s = quote_identifier(id.name) if id.HasField("table_name"): s = "{0}.{1}".format(quote_identifier(id.table_name), s) if id.HasField("schema_name"): s = "{0}.{1}".format(quote_identifier(id.schema_name), s) # if id.HasField("document_path"): # s = "{0}@{1}".format(s, id.document_path) return s def function_call_to_string(fc): s = quote_identifier(fc.name.name) + "(" if fc.name.HasField("schema_name"): s = quote_identifier(fc.name.schema_name) + "." + s for i in xrange(0, len(fc.param)): s = s + expr_to_string(fc.param[i]) if i + 1 < len(fc.param): s = s + ", " return s + ")" def operator_to_string(op): ps = op.param if op.name == "IN": s = expr_to_string(ps[0]) + " IN (" for i in xrange(1, len(ps)): s = s + expr_to_string(ps[i]) if i + 1 < len(ps): s = s + ", " return s + ")" elif op.name == "INTERVAL": return ("INTERVAL {0} {1}" "".format(expr_to_string(ps[0]), expr_to_string(ps[1]).replace('"', ''))) elif op.name == "BETWEEN": return "{0} BETWEEN {1} AND {2}".format(expr_to_string(ps[0]), expr_to_string(ps[1]), expr_to_string(ps[2])) elif op.name == "LIKE" and len(ps) == 3: return "{0} LIKE {1} ESCAPE {2}".format(expr_to_string(ps[0]), expr_to_string(ps[1]), expr_to_string(ps[2])) elif len(ps) == 2: return "{0} {1} {2}".format(expr_to_string(ps[0]), op.name, expr_to_string(ps[1])) elif len(ps) == 1: if len(op.name) == 1: return "{0}{1}".format(op.name, expr_to_string(ps[0])) else: # something like NOT return "{0} ({1})".format(op.name, expr_to_string(ps[0])) else: raise ValueError("Unknown operator structure: {0}".format(op)) def quote_identifier(id): if "`" in id or '"' in id or "'" in id or "@" in id or "." in id: return "`{0}`".format(id.replace("`", "``")) else: return id def expr_to_string(e): if e.type == Expr.LITERAL: return scalar_to_string(e.literal) elif e.type == Expr.IDENT: return column_identifier_to_string(e.identifier) elif e.type == Expr.FUNC_CALL: return function_call_to_string(e.function_call) elif e.type == Expr.OPERATOR: return operator_to_string(e.operator) elif e.type == Expr.VARIABLE: return "@{0}".format(quote_identifier(e.variable)) else: raise ValueError("Unknown expression type: {0}".format(e.type))
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