author | Lennard de Rijk <ljvderijk@gmail.com> |
Mon, 26 Jan 2009 16:11:50 +0000 | |
changeset 1001 | 2faa7f80e8b2 |
parent 323 | ff1a9aa48cfd |
permissions | -rw-r--r-- |
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import re |
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from django.db.backends import BaseDatabaseOperations |
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server_version_re = re.compile(r'PostgreSQL (\d{1,2})\.(\d{1,2})\.?(\d{1,2})?') |
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# This DatabaseOperations class lives in here instead of base.py because it's |
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# used by both the 'postgresql' and 'postgresql_psycopg2' backends. |
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class DatabaseOperations(BaseDatabaseOperations): |
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def __init__(self): |
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self._postgres_version = None |
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def _get_postgres_version(self): |
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if self._postgres_version is None: |
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from django.db import connection |
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cursor = connection.cursor() |
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cursor.execute("SELECT version()") |
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version_string = cursor.fetchone()[0] |
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m = server_version_re.match(version_string) |
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if not m: |
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raise Exception('Unable to determine PostgreSQL version from version() function string: %r' % version_string) |
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self._postgres_version = [int(val) for val in m.groups() if val] |
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return self._postgres_version |
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postgres_version = property(_get_postgres_version) |
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def date_extract_sql(self, lookup_type, field_name): |
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# http://www.postgresql.org/docs/8.0/static/functions-datetime.html#FUNCTIONS-DATETIME-EXTRACT |
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return "EXTRACT('%s' FROM %s)" % (lookup_type, field_name) |
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def date_trunc_sql(self, lookup_type, field_name): |
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# http://www.postgresql.org/docs/8.0/static/functions-datetime.html#FUNCTIONS-DATETIME-TRUNC |
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return "DATE_TRUNC('%s', %s)" % (lookup_type, field_name) |
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def deferrable_sql(self): |
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return " DEFERRABLE INITIALLY DEFERRED" |
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def lookup_cast(self, lookup_type): |
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lookup = '%s' |
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# Cast text lookups to text to allow things like filter(x__contains=4) |
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if lookup_type in ('iexact', 'contains', 'icontains', 'startswith', |
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'istartswith', 'endswith', 'iendswith'): |
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lookup = "%s::text" |
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# Use UPPER(x) for case-insensitive lookups; it's faster. |
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if lookup_type in ('iexact', 'icontains', 'istartswith', 'iendswith'): |
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lookup = 'UPPER(%s)' % lookup |
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return lookup |
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def field_cast_sql(self, db_type): |
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if db_type == 'inet': |
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return 'HOST(%s)' |
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return '%s' |
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def last_insert_id(self, cursor, table_name, pk_name): |
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cursor.execute("SELECT CURRVAL('\"%s_%s_seq\"')" % (table_name, pk_name)) |
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return cursor.fetchone()[0] |
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def no_limit_value(self): |
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return None |
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def quote_name(self, name): |
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if name.startswith('"') and name.endswith('"'): |
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return name # Quoting once is enough. |
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return '"%s"' % name |
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def sql_flush(self, style, tables, sequences): |
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if tables: |
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if self.postgres_version[0] >= 8 and self.postgres_version[1] >= 1: |
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# Postgres 8.1+ can do 'TRUNCATE x, y, z...;'. In fact, it *has to* |
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# in order to be able to truncate tables referenced by a foreign |
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# key in any other table. The result is a single SQL TRUNCATE |
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# statement. |
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sql = ['%s %s;' % \ |
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(style.SQL_KEYWORD('TRUNCATE'), |
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style.SQL_FIELD(', '.join([self.quote_name(table) for table in tables])) |
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)] |
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else: |
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# Older versions of Postgres can't do TRUNCATE in a single call, so |
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# they must use a simple delete. |
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sql = ['%s %s %s;' % \ |
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(style.SQL_KEYWORD('DELETE'), |
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style.SQL_KEYWORD('FROM'), |
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style.SQL_FIELD(self.quote_name(table)) |
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) for table in tables] |
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|
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# 'ALTER SEQUENCE sequence_name RESTART WITH 1;'... style SQL statements |
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# to reset sequence indices |
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for sequence_info in sequences: |
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table_name = sequence_info['table'] |
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column_name = sequence_info['column'] |
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if column_name and len(column_name) > 0: |
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sequence_name = '%s_%s_seq' % (table_name, column_name) |
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96 |
else: |
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sequence_name = '%s_id_seq' % table_name |
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sql.append("%s setval('%s', 1, false);" % \ |
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(style.SQL_KEYWORD('SELECT'), |
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style.SQL_FIELD(self.quote_name(sequence_name))) |
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101 |
) |
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102 |
return sql |
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103 |
else: |
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104 |
return [] |
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105 |
|
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106 |
def sequence_reset_sql(self, style, model_list): |
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from django.db import models |
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output = [] |
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qn = self.quote_name |
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for model in model_list: |
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# Use `coalesce` to set the sequence for each model to the max pk value if there are records, |
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# or 1 if there are none. Set the `is_called` property (the third argument to `setval`) to true |
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# if there are records (as the max pk value is already in use), otherwise set it to false. |
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for f in model._meta.local_fields: |
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if isinstance(f, models.AutoField): |
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output.append("%s setval('%s', coalesce(max(%s), 1), max(%s) %s null) %s %s;" % \ |
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117 |
(style.SQL_KEYWORD('SELECT'), |
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style.SQL_FIELD(qn('%s_%s_seq' % (model._meta.db_table, f.column))), |
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style.SQL_FIELD(qn(f.column)), |
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style.SQL_FIELD(qn(f.column)), |
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121 |
style.SQL_KEYWORD('IS NOT'), |
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122 |
style.SQL_KEYWORD('FROM'), |
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style.SQL_TABLE(qn(model._meta.db_table)))) |
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break # Only one AutoField is allowed per model, so don't bother continuing. |
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for f in model._meta.many_to_many: |
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output.append("%s setval('%s', coalesce(max(%s), 1), max(%s) %s null) %s %s;" % \ |
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127 |
(style.SQL_KEYWORD('SELECT'), |
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style.SQL_FIELD(qn('%s_id_seq' % f.m2m_db_table())), |
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style.SQL_FIELD(qn('id')), |
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style.SQL_FIELD(qn('id')), |
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style.SQL_KEYWORD('IS NOT'), |
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style.SQL_KEYWORD('FROM'), |
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style.SQL_TABLE(qn(f.m2m_db_table())))) |
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134 |
return output |
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135 |
|
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136 |
def savepoint_create_sql(self, sid): |
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return "SAVEPOINT %s" % sid |
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138 |
|
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def savepoint_commit_sql(self, sid): |
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return "RELEASE SAVEPOINT %s" % sid |
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141 |
|
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142 |
def savepoint_rollback_sql(self, sid): |
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return "ROLLBACK TO SAVEPOINT %s" % sid |
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144 |
|
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def prep_for_iexact_query(self, x): |
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return x |