File size: 4,838 Bytes
66b3b8e | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 | from itertools import zip_longest
from sqlalchemy import schema
from sqlalchemy.sql.elements import ClauseList
class CompareTable:
def __init__(self, table):
self.table = table
def __eq__(self, other):
if self.table.name != other.name or self.table.schema != other.schema:
return False
for c1, c2 in zip_longest(self.table.c, other.c):
if (c1 is None and c2 is not None) or (
c2 is None and c1 is not None
):
return False
if CompareColumn(c1) != c2:
return False
return True
# TODO: compare constraints, indexes
def __ne__(self, other):
return not self.__eq__(other)
class CompareColumn:
def __init__(self, column):
self.column = column
def __eq__(self, other):
return (
self.column.name == other.name
and self.column.nullable == other.nullable
)
# TODO: datatypes etc
def __ne__(self, other):
return not self.__eq__(other)
class CompareIndex:
def __init__(self, index, name_only=False):
self.index = index
self.name_only = name_only
def __eq__(self, other):
if self.name_only:
return self.index.name == other.name
else:
return (
str(schema.CreateIndex(self.index))
== str(schema.CreateIndex(other))
and self.index.dialect_kwargs == other.dialect_kwargs
)
def __ne__(self, other):
return not self.__eq__(other)
def __repr__(self):
expr = ClauseList(*self.index.expressions)
try:
expr_str = expr.compile().string
except Exception:
expr_str = str(expr)
return f"<CompareIndex {self.index.name}({expr_str})>"
class CompareCheckConstraint:
def __init__(self, constraint):
self.constraint = constraint
def __eq__(self, other):
return (
isinstance(other, schema.CheckConstraint)
and self.constraint.name == other.name
and (str(self.constraint.sqltext) == str(other.sqltext))
and (other.table.name == self.constraint.table.name)
and other.table.schema == self.constraint.table.schema
)
def __ne__(self, other):
return not self.__eq__(other)
class CompareForeignKey:
def __init__(self, constraint):
self.constraint = constraint
def __eq__(self, other):
r1 = (
isinstance(other, schema.ForeignKeyConstraint)
and self.constraint.name == other.name
and (other.table.name == self.constraint.table.name)
and other.table.schema == self.constraint.table.schema
)
if not r1:
return False
for c1, c2 in zip_longest(self.constraint.columns, other.columns):
if (c1 is None and c2 is not None) or (
c2 is None and c1 is not None
):
return False
if CompareColumn(c1) != c2:
return False
return True
def __ne__(self, other):
return not self.__eq__(other)
class ComparePrimaryKey:
def __init__(self, constraint):
self.constraint = constraint
def __eq__(self, other):
r1 = (
isinstance(other, schema.PrimaryKeyConstraint)
and self.constraint.name == other.name
and (other.table.name == self.constraint.table.name)
and other.table.schema == self.constraint.table.schema
)
if not r1:
return False
for c1, c2 in zip_longest(self.constraint.columns, other.columns):
if (c1 is None and c2 is not None) or (
c2 is None and c1 is not None
):
return False
if CompareColumn(c1) != c2:
return False
return True
def __ne__(self, other):
return not self.__eq__(other)
class CompareUniqueConstraint:
def __init__(self, constraint):
self.constraint = constraint
def __eq__(self, other):
r1 = (
isinstance(other, schema.UniqueConstraint)
and self.constraint.name == other.name
and (other.table.name == self.constraint.table.name)
and other.table.schema == self.constraint.table.schema
)
if not r1:
return False
for c1, c2 in zip_longest(self.constraint.columns, other.columns):
if (c1 is None and c2 is not None) or (
c2 is None and c1 is not None
):
return False
if CompareColumn(c1) != c2:
return False
return True
def __ne__(self, other):
return not self.__eq__(other)
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