author | Sverre Rabbelier <srabbelier@gmail.com> |
Fri, 06 Mar 2009 22:32:26 +0000 | |
changeset 1700 | 599a5ff8f422 |
parent 323 | ff1a9aa48cfd |
permissions | -rw-r--r-- |
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""" |
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SQLite3 backend for django. |
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Python 2.3 and 2.4 require pysqlite2 (http://pysqlite.org/). |
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Python 2.5 and later use the sqlite3 module in the standard library. |
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""" |
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from django.db.backends import * |
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from django.db.backends.sqlite3.client import DatabaseClient |
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from django.db.backends.sqlite3.creation import DatabaseCreation |
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from django.db.backends.sqlite3.introspection import DatabaseIntrospection |
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try: |
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try: |
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from sqlite3 import dbapi2 as Database |
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except ImportError, e1: |
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from pysqlite2 import dbapi2 as Database |
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except ImportError, exc: |
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import sys |
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from django.core.exceptions import ImproperlyConfigured |
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if sys.version_info < (2, 5, 0): |
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module = 'pysqlite2' |
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else: |
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module = 'sqlite3' |
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exc = e1 |
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raise ImproperlyConfigured, "Error loading %s module: %s" % (module, exc) |
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try: |
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import decimal |
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except ImportError: |
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from django.utils import _decimal as decimal # for Python 2.3 |
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DatabaseError = Database.DatabaseError |
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IntegrityError = Database.IntegrityError |
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Database.register_converter("bool", lambda s: str(s) == '1') |
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Database.register_converter("time", util.typecast_time) |
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Database.register_converter("date", util.typecast_date) |
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Database.register_converter("datetime", util.typecast_timestamp) |
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Database.register_converter("timestamp", util.typecast_timestamp) |
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Database.register_converter("TIMESTAMP", util.typecast_timestamp) |
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Database.register_converter("decimal", util.typecast_decimal) |
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Database.register_adapter(decimal.Decimal, util.rev_typecast_decimal) |
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if Database.version_info >= (2,4,1): |
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# Starting in 2.4.1, the str type is not accepted anymore, therefore, |
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# we convert all str objects to Unicode |
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# As registering a adapter for a primitive type causes a small |
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# slow-down, this adapter is only registered for sqlite3 versions |
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# needing it. |
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Database.register_adapter(str, lambda s:s.decode('utf-8')) |
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class DatabaseFeatures(BaseDatabaseFeatures): |
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# SQLite cannot handle us only partially reading from a cursor's result set |
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# and then writing the same rows to the database in another cursor. This |
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# setting ensures we always read result sets fully into memory all in one |
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# go. |
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can_use_chunked_reads = False |
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class DatabaseOperations(BaseDatabaseOperations): |
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def date_extract_sql(self, lookup_type, field_name): |
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# sqlite doesn't support extract, so we fake it with the user-defined |
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# function django_extract that's registered in connect(). |
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return 'django_extract("%s", %s)' % (lookup_type.lower(), field_name) |
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def date_trunc_sql(self, lookup_type, field_name): |
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# sqlite doesn't support DATE_TRUNC, so we fake it with a user-defined |
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# function django_date_trunc that's registered in connect(). |
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return 'django_date_trunc("%s", %s)' % (lookup_type.lower(), field_name) |
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def drop_foreignkey_sql(self): |
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return "" |
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def pk_default_value(self): |
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return 'NULL' |
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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 no_limit_value(self): |
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return -1 |
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def sql_flush(self, style, tables, sequences): |
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# NB: The generated SQL below is specific to SQLite |
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# Note: The DELETE FROM... SQL generated below works for SQLite databases |
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# because constraints don't exist |
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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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# Note: No requirement for reset of auto-incremented indices (cf. other |
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# sql_flush() implementations). Just return SQL at this point |
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return sql |
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def year_lookup_bounds(self, value): |
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first = '%s-01-01' |
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second = '%s-12-31 23:59:59.999999' |
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return [first % value, second % value] |
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102 |
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class DatabaseWrapper(BaseDatabaseWrapper): |
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104 |
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# SQLite requires LIKE statements to include an ESCAPE clause if the value |
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# being escaped has a percent or underscore in it. |
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# See http://www.sqlite.org/lang_expr.html for an explanation. |
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operators = { |
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'exact': '= %s', |
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110 |
'iexact': "LIKE %s ESCAPE '\\'", |
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111 |
'contains': "LIKE %s ESCAPE '\\'", |
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112 |
'icontains': "LIKE %s ESCAPE '\\'", |
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113 |
'regex': 'REGEXP %s', |
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114 |
'iregex': "REGEXP '(?i)' || %s", |
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115 |
'gt': '> %s', |
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116 |
'gte': '>= %s', |
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117 |
'lt': '< %s', |
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118 |
'lte': '<= %s', |
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119 |
'startswith': "LIKE %s ESCAPE '\\'", |
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120 |
'endswith': "LIKE %s ESCAPE '\\'", |
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121 |
'istartswith': "LIKE %s ESCAPE '\\'", |
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122 |
'iendswith': "LIKE %s ESCAPE '\\'", |
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123 |
} |
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124 |
|
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125 |
def __init__(self, *args, **kwargs): |
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126 |
super(DatabaseWrapper, self).__init__(*args, **kwargs) |
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127 |
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128 |
self.features = DatabaseFeatures() |
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129 |
self.ops = DatabaseOperations() |
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130 |
self.client = DatabaseClient() |
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131 |
self.creation = DatabaseCreation(self) |
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132 |
self.introspection = DatabaseIntrospection(self) |
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133 |
self.validation = BaseDatabaseValidation() |
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134 |
|
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135 |
def _cursor(self, settings): |
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136 |
if self.connection is None: |
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137 |
if not settings.DATABASE_NAME: |
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138 |
from django.core.exceptions import ImproperlyConfigured |
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139 |
raise ImproperlyConfigured, "Please fill out DATABASE_NAME in the settings module before using the database." |
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140 |
kwargs = { |
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141 |
'database': settings.DATABASE_NAME, |
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142 |
'detect_types': Database.PARSE_DECLTYPES | Database.PARSE_COLNAMES, |
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143 |
} |
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144 |
kwargs.update(self.options) |
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145 |
self.connection = Database.connect(**kwargs) |
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146 |
# Register extract, date_trunc, and regexp functions. |
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147 |
self.connection.create_function("django_extract", 2, _sqlite_extract) |
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148 |
self.connection.create_function("django_date_trunc", 2, _sqlite_date_trunc) |
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149 |
self.connection.create_function("regexp", 2, _sqlite_regexp) |
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150 |
return self.connection.cursor(factory=SQLiteCursorWrapper) |
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151 |
|
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152 |
def close(self): |
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153 |
from django.conf import settings |
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154 |
# If database is in memory, closing the connection destroys the |
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155 |
# database. To prevent accidental data loss, ignore close requests on |
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156 |
# an in-memory db. |
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157 |
if settings.DATABASE_NAME != ":memory:": |
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158 |
BaseDatabaseWrapper.close(self) |
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159 |
|
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160 |
class SQLiteCursorWrapper(Database.Cursor): |
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161 |
""" |
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162 |
Django uses "format" style placeholders, but pysqlite2 uses "qmark" style. |
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163 |
This fixes it -- but note that if you want to use a literal "%s" in a query, |
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|
164 |
you'll need to use "%%s". |
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165 |
""" |
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166 |
def execute(self, query, params=()): |
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167 |
query = self.convert_query(query, len(params)) |
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168 |
return Database.Cursor.execute(self, query, params) |
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169 |
|
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170 |
def executemany(self, query, param_list): |
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171 |
try: |
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|
172 |
query = self.convert_query(query, len(param_list[0])) |
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173 |
return Database.Cursor.executemany(self, query, param_list) |
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|
174 |
except (IndexError,TypeError): |
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175 |
# No parameter list provided |
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|
176 |
return None |
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|
177 |
|
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|
178 |
def convert_query(self, query, num_params): |
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|
179 |
return query % tuple("?" * num_params) |
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180 |
|
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181 |
def _sqlite_extract(lookup_type, dt): |
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182 |
try: |
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183 |
dt = util.typecast_timestamp(dt) |
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|
184 |
except (ValueError, TypeError): |
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|
185 |
return None |
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|
186 |
return unicode(getattr(dt, lookup_type)) |
54
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187 |
|
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|
188 |
def _sqlite_date_trunc(lookup_type, dt): |
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|
189 |
try: |
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|
190 |
dt = util.typecast_timestamp(dt) |
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|
191 |
except (ValueError, TypeError): |
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|
192 |
return None |
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|
193 |
if lookup_type == 'year': |
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|
194 |
return "%i-01-01 00:00:00" % dt.year |
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195 |
elif lookup_type == 'month': |
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|
196 |
return "%i-%02i-01 00:00:00" % (dt.year, dt.month) |
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|
197 |
elif lookup_type == 'day': |
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|
198 |
return "%i-%02i-%02i 00:00:00" % (dt.year, dt.month, dt.day) |
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199 |
|
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|
200 |
def _sqlite_regexp(re_pattern, re_string): |
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|
201 |
import re |
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|
202 |
try: |
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|
203 |
return bool(re.search(re_pattern, re_string)) |
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204 |
except: |
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|
205 |
return False |