forked from s442783/HighNeed_projekt_inz
226 lines
9.7 KiB
Python
226 lines
9.7 KiB
Python
from django.db.backends.base.introspection import (
|
|
BaseDatabaseIntrospection, FieldInfo, TableInfo,
|
|
)
|
|
from django.db.models import Index
|
|
|
|
|
|
class DatabaseIntrospection(BaseDatabaseIntrospection):
|
|
# Maps type codes to Django Field types.
|
|
data_types_reverse = {
|
|
16: 'BooleanField',
|
|
17: 'BinaryField',
|
|
20: 'BigIntegerField',
|
|
21: 'SmallIntegerField',
|
|
23: 'IntegerField',
|
|
25: 'TextField',
|
|
700: 'FloatField',
|
|
701: 'FloatField',
|
|
869: 'GenericIPAddressField',
|
|
1042: 'CharField', # blank-padded
|
|
1043: 'CharField',
|
|
1082: 'DateField',
|
|
1083: 'TimeField',
|
|
1114: 'DateTimeField',
|
|
1184: 'DateTimeField',
|
|
1186: 'DurationField',
|
|
1266: 'TimeField',
|
|
1700: 'DecimalField',
|
|
2950: 'UUIDField',
|
|
3802: 'JSONField',
|
|
}
|
|
|
|
ignored_tables = []
|
|
|
|
def get_field_type(self, data_type, description):
|
|
field_type = super().get_field_type(data_type, description)
|
|
if description.default and 'nextval' in description.default:
|
|
if field_type == 'IntegerField':
|
|
return 'AutoField'
|
|
elif field_type == 'BigIntegerField':
|
|
return 'BigAutoField'
|
|
elif field_type == 'SmallIntegerField':
|
|
return 'SmallAutoField'
|
|
return field_type
|
|
|
|
def get_table_list(self, cursor):
|
|
"""Return a list of table and view names in the current database."""
|
|
cursor.execute("""
|
|
SELECT c.relname,
|
|
CASE WHEN {} THEN 'p' WHEN c.relkind IN ('m', 'v') THEN 'v' ELSE 't' END
|
|
FROM pg_catalog.pg_class c
|
|
LEFT JOIN pg_catalog.pg_namespace n ON n.oid = c.relnamespace
|
|
WHERE c.relkind IN ('f', 'm', 'p', 'r', 'v')
|
|
AND n.nspname NOT IN ('pg_catalog', 'pg_toast')
|
|
AND pg_catalog.pg_table_is_visible(c.oid)
|
|
""".format('c.relispartition' if self.connection.features.supports_table_partitions else 'FALSE'))
|
|
return [TableInfo(*row) for row in cursor.fetchall() if row[0] not in self.ignored_tables]
|
|
|
|
def get_table_description(self, cursor, table_name):
|
|
"""
|
|
Return a description of the table with the DB-API cursor.description
|
|
interface.
|
|
"""
|
|
# Query the pg_catalog tables as cursor.description does not reliably
|
|
# return the nullable property and information_schema.columns does not
|
|
# contain details of materialized views.
|
|
cursor.execute("""
|
|
SELECT
|
|
a.attname AS column_name,
|
|
NOT (a.attnotnull OR (t.typtype = 'd' AND t.typnotnull)) AS is_nullable,
|
|
pg_get_expr(ad.adbin, ad.adrelid) AS column_default
|
|
FROM pg_attribute a
|
|
LEFT JOIN pg_attrdef ad ON a.attrelid = ad.adrelid AND a.attnum = ad.adnum
|
|
JOIN pg_type t ON a.atttypid = t.oid
|
|
JOIN pg_class c ON a.attrelid = c.oid
|
|
JOIN pg_namespace n ON c.relnamespace = n.oid
|
|
WHERE c.relkind IN ('f', 'm', 'p', 'r', 'v')
|
|
AND c.relname = %s
|
|
AND n.nspname NOT IN ('pg_catalog', 'pg_toast')
|
|
AND pg_catalog.pg_table_is_visible(c.oid)
|
|
""", [table_name])
|
|
field_map = {line[0]: line[1:] for line in cursor.fetchall()}
|
|
cursor.execute("SELECT * FROM %s LIMIT 1" % self.connection.ops.quote_name(table_name))
|
|
return [
|
|
FieldInfo(
|
|
line.name,
|
|
line.type_code,
|
|
line.display_size,
|
|
line.internal_size,
|
|
line.precision,
|
|
line.scale,
|
|
*field_map[line.name],
|
|
)
|
|
for line in cursor.description
|
|
]
|
|
|
|
def get_sequences(self, cursor, table_name, table_fields=()):
|
|
cursor.execute("""
|
|
SELECT s.relname as sequence_name, col.attname
|
|
FROM pg_class s
|
|
JOIN pg_namespace sn ON sn.oid = s.relnamespace
|
|
JOIN pg_depend d ON d.refobjid = s.oid AND d.refclassid = 'pg_class'::regclass
|
|
JOIN pg_attrdef ad ON ad.oid = d.objid AND d.classid = 'pg_attrdef'::regclass
|
|
JOIN pg_attribute col ON col.attrelid = ad.adrelid AND col.attnum = ad.adnum
|
|
JOIN pg_class tbl ON tbl.oid = ad.adrelid
|
|
WHERE s.relkind = 'S'
|
|
AND d.deptype in ('a', 'n')
|
|
AND pg_catalog.pg_table_is_visible(tbl.oid)
|
|
AND tbl.relname = %s
|
|
""", [table_name])
|
|
return [
|
|
{'name': row[0], 'table': table_name, 'column': row[1]}
|
|
for row in cursor.fetchall()
|
|
]
|
|
|
|
def get_relations(self, cursor, table_name):
|
|
"""
|
|
Return a dictionary of {field_name: (field_name_other_table, other_table)}
|
|
representing all relationships to the given table.
|
|
"""
|
|
return {row[0]: (row[2], row[1]) for row in self.get_key_columns(cursor, table_name)}
|
|
|
|
def get_key_columns(self, cursor, table_name):
|
|
cursor.execute("""
|
|
SELECT a1.attname, c2.relname, a2.attname
|
|
FROM pg_constraint con
|
|
LEFT JOIN pg_class c1 ON con.conrelid = c1.oid
|
|
LEFT JOIN pg_class c2 ON con.confrelid = c2.oid
|
|
LEFT JOIN pg_attribute a1 ON c1.oid = a1.attrelid AND a1.attnum = con.conkey[1]
|
|
LEFT JOIN pg_attribute a2 ON c2.oid = a2.attrelid AND a2.attnum = con.confkey[1]
|
|
WHERE
|
|
c1.relname = %s AND
|
|
con.contype = 'f' AND
|
|
c1.relnamespace = c2.relnamespace AND
|
|
pg_catalog.pg_table_is_visible(c1.oid)
|
|
""", [table_name])
|
|
return cursor.fetchall()
|
|
|
|
def get_constraints(self, cursor, table_name):
|
|
"""
|
|
Retrieve any constraints or keys (unique, pk, fk, check, index) across
|
|
one or more columns. Also retrieve the definition of expression-based
|
|
indexes.
|
|
"""
|
|
constraints = {}
|
|
# Loop over the key table, collecting things as constraints. The column
|
|
# array must return column names in the same order in which they were
|
|
# created.
|
|
cursor.execute("""
|
|
SELECT
|
|
c.conname,
|
|
array(
|
|
SELECT attname
|
|
FROM unnest(c.conkey) WITH ORDINALITY cols(colid, arridx)
|
|
JOIN pg_attribute AS ca ON cols.colid = ca.attnum
|
|
WHERE ca.attrelid = c.conrelid
|
|
ORDER BY cols.arridx
|
|
),
|
|
c.contype,
|
|
(SELECT fkc.relname || '.' || fka.attname
|
|
FROM pg_attribute AS fka
|
|
JOIN pg_class AS fkc ON fka.attrelid = fkc.oid
|
|
WHERE fka.attrelid = c.confrelid AND fka.attnum = c.confkey[1]),
|
|
cl.reloptions
|
|
FROM pg_constraint AS c
|
|
JOIN pg_class AS cl ON c.conrelid = cl.oid
|
|
WHERE cl.relname = %s AND pg_catalog.pg_table_is_visible(cl.oid)
|
|
""", [table_name])
|
|
for constraint, columns, kind, used_cols, options in cursor.fetchall():
|
|
constraints[constraint] = {
|
|
"columns": columns,
|
|
"primary_key": kind == "p",
|
|
"unique": kind in ["p", "u"],
|
|
"foreign_key": tuple(used_cols.split(".", 1)) if kind == "f" else None,
|
|
"check": kind == "c",
|
|
"index": False,
|
|
"definition": None,
|
|
"options": options,
|
|
}
|
|
# Now get indexes
|
|
cursor.execute("""
|
|
SELECT
|
|
indexname, array_agg(attname ORDER BY arridx), indisunique, indisprimary,
|
|
array_agg(ordering ORDER BY arridx), amname, exprdef, s2.attoptions
|
|
FROM (
|
|
SELECT
|
|
c2.relname as indexname, idx.*, attr.attname, am.amname,
|
|
CASE
|
|
WHEN idx.indexprs IS NOT NULL THEN
|
|
pg_get_indexdef(idx.indexrelid)
|
|
END AS exprdef,
|
|
CASE am.amname
|
|
WHEN 'btree' THEN
|
|
CASE (option & 1)
|
|
WHEN 1 THEN 'DESC' ELSE 'ASC'
|
|
END
|
|
END as ordering,
|
|
c2.reloptions as attoptions
|
|
FROM (
|
|
SELECT *
|
|
FROM pg_index i, unnest(i.indkey, i.indoption) WITH ORDINALITY koi(key, option, arridx)
|
|
) idx
|
|
LEFT JOIN pg_class c ON idx.indrelid = c.oid
|
|
LEFT JOIN pg_class c2 ON idx.indexrelid = c2.oid
|
|
LEFT JOIN pg_am am ON c2.relam = am.oid
|
|
LEFT JOIN pg_attribute attr ON attr.attrelid = c.oid AND attr.attnum = idx.key
|
|
WHERE c.relname = %s AND pg_catalog.pg_table_is_visible(c.oid)
|
|
) s2
|
|
GROUP BY indexname, indisunique, indisprimary, amname, exprdef, attoptions;
|
|
""", [table_name])
|
|
for index, columns, unique, primary, orders, type_, definition, options in cursor.fetchall():
|
|
if index not in constraints:
|
|
basic_index = type_ == 'btree' and not index.endswith('_btree') and options is None
|
|
constraints[index] = {
|
|
"columns": columns if columns != [None] else [],
|
|
"orders": orders if orders != [None] else [],
|
|
"primary_key": primary,
|
|
"unique": unique,
|
|
"foreign_key": None,
|
|
"check": False,
|
|
"index": True,
|
|
"type": Index.suffix if basic_index else type_,
|
|
"definition": definition,
|
|
"options": options,
|
|
}
|
|
return constraints
|