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Factored create_fk_sql, create_unique_sql, and delete_constraint_sql.

This commit is contained in:
Sergey Fedoseev 2014-09-16 16:46:50 +06:00 committed by Tim Graham
parent 3c6ac0bab8
commit 0bea6c8749
1 changed files with 46 additions and 110 deletions
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156
django/db/backends/schema.py
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@ -231,17 +231,7 @@ class BaseDatabaseSchemaEditor(object):
to_table = field.rel.to._meta.db_table
to_column = field.rel.to._meta.get_field(field.rel.field_name).column
if self.connection.features.supports_foreign_keys:
self.deferred_sql.append(
self.sql_create_fk % {
"name": self._create_index_name(
model, [field.column], suffix="_fk_%s_%s" % (to_table, to_column)
),
"table": self.quote_name(model._meta.db_table),
"column": self.quote_name(field.column),
"to_table": self.quote_name(to_table),
"to_column": self.quote_name(to_column),
}
)
self.deferred_sql.append(self._create_fk_sql(model, field, "_fk_%(to_table)s_%(to_column)s"))
elif self.sql_create_inline_fk:
definition += " " + self.sql_create_inline_fk % {
"to_table": self.quote_name(to_table),
@ -310,20 +300,11 @@ class BaseDatabaseSchemaEditor(object):
model._meta.db_table,
", ".join(columns),
))
self.execute(
self.sql_delete_unique % {
"table": self.quote_name(model._meta.db_table),
"name": constraint_names[0],
},
)
self.execute(self._delete_constraint_sql(self.sql_delete_unique, model, constraint_names[0]))
# Created uniques
for fields in news.difference(olds):
columns = [model._meta.get_field_by_name(field)[0].column for field in fields]
self.execute(self.sql_create_unique % {
"table": self.quote_name(model._meta.db_table),
"name": self._create_index_name(model, columns, suffix="_uniq"),
"columns": ", ".join(self.quote_name(column) for column in columns),
})
self.execute(self._create_unique_sql(model, columns))
def alter_index_together(self, model, old_index_together, new_index_together):
"""
@ -343,12 +324,7 @@ class BaseDatabaseSchemaEditor(object):
model._meta.db_table,
", ".join(columns),
))
self.execute(
self.sql_delete_index % {
"table": self.quote_name(model._meta.db_table),
"name": constraint_names[0],
},
)
self.execute(self._delete_constraint_sql(self.sql_delete_index, model, constraint_names[0]))
# Created indexes
for field_names in news.difference(olds):
fields = [model._meta.get_field_by_name(field)[0] for field in field_names]
@ -415,17 +391,7 @@ class BaseDatabaseSchemaEditor(object):
self.deferred_sql.append(self._create_index_sql(model, [field]))
# Add any FK constraints later
if field.rel and self.connection.features.supports_foreign_keys and field.db_constraint:
to_table = field.rel.to._meta.db_table
to_column = field.rel.to._meta.get_field(field.rel.field_name).column
self.deferred_sql.append(
self.sql_create_fk % {
"name": self._create_index_name(model, [field.column], suffix="_fk_%s_%s" % (to_table, to_column)),
"table": self.quote_name(model._meta.db_table),
"column": self.quote_name(field.column),
"to_table": self.quote_name(to_table),
"to_column": self.quote_name(to_column),
}
)
self.deferred_sql.append(self._create_fk_sql(model, field, "_fk_%(to_table)s_%(to_column)s"))
# Reset connection if required
if self.connection.features.connection_persists_old_columns:
self.connection.close()
@ -445,12 +411,7 @@ class BaseDatabaseSchemaEditor(object):
if field.rel:
fk_names = self._constraint_names(model, [field.column], foreign_key=True)
for fk_name in fk_names:
self.execute(
self.sql_delete_fk % {
"table": self.quote_name(model._meta.db_table),
"name": fk_name,
}
)
self.execute(self._delete_constraint_sql(self.sql_delete_fk, model, fk_name))
# Delete the column
sql = self.sql_delete_column % {
"table": self.quote_name(model._meta.db_table),
@ -516,12 +477,7 @@ class BaseDatabaseSchemaEditor(object):
old_field.column,
))
for constraint_name in constraint_names:
self.execute(
self.sql_delete_unique % {
"table": self.quote_name(model._meta.db_table),
"name": constraint_name,
},
)
self.execute(self._delete_constraint_sql(self.sql_delete_unique, model, constraint_name))
# Drop any FK constraints, we'll remake them later
fks_dropped = set()
if old_field.rel and old_field.db_constraint:
@ -534,24 +490,14 @@ class BaseDatabaseSchemaEditor(object):
))
for fk_name in fk_names:
fks_dropped.add((old_field.column,))
self.execute(
self.sql_delete_fk % {
"table": self.quote_name(model._meta.db_table),
"name": fk_name,
}
)
self.execute(self._delete_constraint_sql(self.sql_delete_fk, model, fk_name))
# Drop incoming FK constraints if we're a primary key and things are going
# to change.
if old_field.primary_key and new_field.primary_key and old_type != new_type:
for rel in new_field.model._meta.get_all_related_objects():
rel_fk_names = self._constraint_names(rel.model, [rel.field.column], foreign_key=True)
for fk_name in rel_fk_names:
self.execute(
self.sql_delete_fk % {
"table": self.quote_name(rel.model._meta.db_table),
"name": fk_name,
}
)
self.execute(self._delete_constraint_sql(self.sql_delete_fk, rel.model, fk_name))
# Removed an index?
if (old_field.db_index and not new_field.db_index and
not old_field.unique and not
@ -565,12 +511,7 @@ class BaseDatabaseSchemaEditor(object):
old_field.column,
))
for index_name in index_names:
self.execute(
self.sql_delete_index % {
"table": self.quote_name(model._meta.db_table),
"name": index_name,
}
)
self.execute(self._delete_constraint_sql(self.sql_delete_index, model, index_name))
# Change check constraints?
if old_db_params['check'] != new_db_params['check'] and old_db_params['check']:
constraint_names = self._constraint_names(model, [old_field.column], check=True)
@ -581,12 +522,7 @@ class BaseDatabaseSchemaEditor(object):
old_field.column,
))
for constraint_name in constraint_names:
self.execute(
self.sql_delete_check % {
"table": self.quote_name(model._meta.db_table),
"name": constraint_name,
}
)
self.execute(self._delete_constraint_sql(self.sql_delete_check, model, constraint_name))
# Have they renamed the column?
if old_field.column != new_field.column:
self.execute(self.sql_rename_column % {
@ -671,13 +607,7 @@ class BaseDatabaseSchemaEditor(object):
self.execute(sql, params)
# Added a unique?
if not old_field.unique and new_field.unique:
self.execute(
self.sql_create_unique % {
"table": self.quote_name(model._meta.db_table),
"name": self._create_index_name(model, [new_field.column], suffix="_uniq"),
"columns": self.quote_name(new_field.column),
}
)
self.execute(self._create_unique_sql(model, [new_field.column]))
# Added an index?
if (not old_field.db_index and new_field.db_index and
not new_field.unique and not
@ -700,12 +630,7 @@ class BaseDatabaseSchemaEditor(object):
model._meta.db_table,
))
for constraint_name in constraint_names:
self.execute(
self.sql_delete_pk % {
"table": self.quote_name(model._meta.db_table),
"name": constraint_name,
},
)
self.execute(self._delete_constraint_sql(self.sql_delete_pk, model, constraint_name))
# Make the new one
self.execute(
self.sql_create_pk % {
@ -733,31 +658,11 @@ class BaseDatabaseSchemaEditor(object):
if new_field.rel and \
(fks_dropped or (old_field.rel and not old_field.db_constraint)) and \
new_field.db_constraint:
to_table = new_field.rel.to._meta.db_table
to_column = new_field.rel.get_related_field().column
self.execute(
self.sql_create_fk % {
"table": self.quote_name(model._meta.db_table),
"name": self._create_index_name(
model, [new_field.column], suffix="_fk_%s_%s" % (to_table, to_column)
),
"column": self.quote_name(new_field.column),
"to_table": self.quote_name(to_table),
"to_column": self.quote_name(to_column),
}
)
self.execute(self._create_fk_sql(model, new_field, "_fk_%(to_table)s_%(to_column)s"))
# Rebuild FKs that pointed to us if we previously had to drop them
if old_field.primary_key and new_field.primary_key and old_type != new_type:
for rel in new_field.model._meta.get_all_related_objects():
self.execute(
self.sql_create_fk % {
"table": self.quote_name(rel.model._meta.db_table),
"name": self._create_index_name(rel.model, [rel.field.column], suffix="_fk"),
"column": self.quote_name(rel.field.column),
"to_table": self.quote_name(model._meta.db_table),
"to_column": self.quote_name(new_field.column),
}
)
self.execute(self._create_fk_sql(rel.model, rel.field, "_fk"))
# Does it have check constraints we need to add?
if old_db_params['check'] != new_db_params['check'] and new_db_params['check']:
self.execute(
@ -861,6 +766,37 @@ class BaseDatabaseSchemaEditor(object):
"extra": "",
}
def _create_fk_sql(self, model, field, suffix):
from_table = model._meta.db_table
from_column = field.column
to_table = field.related_field.model._meta.db_table
to_column = field.related_field.column
suffix = suffix % {
"to_table": to_table,
"to_column": to_column,
}
return self.sql_create_fk % {
"table": self.quote_name(from_table),
"name": self._create_index_name(model, [from_column], suffix=suffix),
"column": self.quote_name(from_column),
"to_table": self.quote_name(to_table),
"to_column": self.quote_name(to_column),
}
def _create_unique_sql(self, model, columns):
return self.sql_create_unique % {
"table": self.quote_name(model._meta.db_table),
"name": self._create_index_name(model, columns, suffix="_uniq"),
"columns": ", ".join(self.quote_name(column) for column in columns),
}
def _delete_constraint_sql(self, template, model, name):
return template % {
"table": self.quote_name(model._meta.db_table),
"name": name,
}
def _constraint_names(self, model, column_names=None, unique=None,
primary_key=None, index=None, foreign_key=None,
check=None):