author | Lennard de Rijk <ljvderijk@gmail.com> |
Fri, 10 Apr 2009 15:32:11 +0000 | |
changeset 2146 | 57c74ce47fa3 |
parent 323 | ff1a9aa48cfd |
permissions | -rw-r--r-- |
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""" |
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MySQL database backend for Django. |
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|
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Requires MySQLdb: http://sourceforge.net/projects/mysql-python |
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""" |
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|
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import re |
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|
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try: |
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import MySQLdb as Database |
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except ImportError, e: |
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from django.core.exceptions import ImproperlyConfigured |
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raise ImproperlyConfigured("Error loading MySQLdb module: %s" % e) |
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|
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# We want version (1, 2, 1, 'final', 2) or later. We can't just use |
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# lexicographic ordering in this check because then (1, 2, 1, 'gamma') |
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# inadvertently passes the version test. |
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version = Database.version_info |
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if (version < (1,2,1) or (version[:3] == (1, 2, 1) and |
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(len(version) < 5 or version[3] != 'final' or version[4] < 2))): |
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from django.core.exceptions import ImproperlyConfigured |
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raise ImproperlyConfigured("MySQLdb-1.2.1p2 or newer is required; you have %s" % Database.__version__) |
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|
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from MySQLdb.converters import conversions |
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from MySQLdb.constants import FIELD_TYPE, FLAG |
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|
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from django.db.backends import * |
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from django.db.backends.mysql.client import DatabaseClient |
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from django.db.backends.mysql.creation import DatabaseCreation |
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from django.db.backends.mysql.introspection import DatabaseIntrospection |
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from django.db.backends.mysql.validation import DatabaseValidation |
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|
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# Raise exceptions for database warnings if DEBUG is on |
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from django.conf import settings |
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if settings.DEBUG: |
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from warnings import filterwarnings |
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filterwarnings("error", category=Database.Warning) |
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|
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DatabaseError = Database.DatabaseError |
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IntegrityError = Database.IntegrityError |
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|
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# MySQLdb-1.2.1 supports the Python boolean type, and only uses datetime |
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# module for time-related columns; older versions could have used mx.DateTime |
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# or strings if there were no datetime module. However, MySQLdb still returns |
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# TIME columns as timedelta -- they are more like timedelta in terms of actual |
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# behavior as they are signed and include days -- and Django expects time, so |
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# we still need to override that. |
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django_conversions = conversions.copy() |
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django_conversions.update({ |
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FIELD_TYPE.TIME: util.typecast_time, |
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FIELD_TYPE.DECIMAL: util.typecast_decimal, |
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FIELD_TYPE.NEWDECIMAL: util.typecast_decimal, |
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}) |
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# This should match the numerical portion of the version numbers (we can treat |
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# versions like 5.0.24 and 5.0.24a as the same). Based on the list of version |
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# at http://dev.mysql.com/doc/refman/4.1/en/news.html and |
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# http://dev.mysql.com/doc/refman/5.0/en/news.html . |
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server_version_re = re.compile(r'(\d{1,2})\.(\d{1,2})\.(\d{1,2})') |
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|
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# MySQLdb-1.2.1 and newer automatically makes use of SHOW WARNINGS on |
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# MySQL-4.1 and newer, so the MysqlDebugWrapper is unnecessary. Since the |
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# point is to raise Warnings as exceptions, this can be done with the Python |
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# warning module, and this is setup when the connection is created, and the |
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# standard util.CursorDebugWrapper can be used. Also, using sql_mode |
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# TRADITIONAL will automatically cause most warnings to be treated as errors. |
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class CursorWrapper(object): |
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""" |
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A thin wrapper around MySQLdb's normal cursor class so that we can catch |
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particular exception instances and reraise them with the right types. |
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Implemented as a wrapper, rather than a subclass, so that we aren't stuck |
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to the particular underlying representation returned by Connection.cursor(). |
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""" |
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codes_for_integrityerror = (1048,) |
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def __init__(self, cursor): |
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self.cursor = cursor |
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def execute(self, query, args=None): |
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try: |
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return self.cursor.execute(query, args) |
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except Database.OperationalError, e: |
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# Map some error codes to IntegrityError, since they seem to be |
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# misclassified and Django would prefer the more logical place. |
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if e[0] in self.codes_for_integrityerror: |
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raise Database.IntegrityError(tuple(e)) |
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raise |
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def executemany(self, query, args): |
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try: |
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return self.cursor.executemany(query, args) |
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except Database.OperationalError, e: |
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# Map some error codes to IntegrityError, since they seem to be |
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# misclassified and Django would prefer the more logical place. |
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if e[0] in self.codes_for_integrityerror: |
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raise Database.IntegrityError(tuple(e)) |
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raise |
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def __getattr__(self, attr): |
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if attr in self.__dict__: |
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return self.__dict__[attr] |
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else: |
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return getattr(self.cursor, attr) |
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def __iter__(self): |
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108 |
return iter(self.cursor) |
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109 |
|
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110 |
class DatabaseFeatures(BaseDatabaseFeatures): |
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111 |
empty_fetchmany_value = () |
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112 |
update_can_self_select = False |
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113 |
related_fields_match_type = True |
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114 |
|
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115 |
class DatabaseOperations(BaseDatabaseOperations): |
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116 |
def date_extract_sql(self, lookup_type, field_name): |
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117 |
# http://dev.mysql.com/doc/mysql/en/date-and-time-functions.html |
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118 |
return "EXTRACT(%s FROM %s)" % (lookup_type.upper(), field_name) |
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119 |
|
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120 |
def date_trunc_sql(self, lookup_type, field_name): |
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121 |
fields = ['year', 'month', 'day', 'hour', 'minute', 'second'] |
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122 |
format = ('%%Y-', '%%m', '-%%d', ' %%H:', '%%i', ':%%s') # Use double percents to escape. |
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123 |
format_def = ('0000-', '01', '-01', ' 00:', '00', ':00') |
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124 |
try: |
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125 |
i = fields.index(lookup_type) + 1 |
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126 |
except ValueError: |
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127 |
sql = field_name |
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128 |
else: |
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129 |
format_str = ''.join([f for f in format[:i]] + [f for f in format_def[i:]]) |
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130 |
sql = "CAST(DATE_FORMAT(%s, '%s') AS DATETIME)" % (field_name, format_str) |
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131 |
return sql |
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132 |
|
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133 |
def drop_foreignkey_sql(self): |
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134 |
return "DROP FOREIGN KEY" |
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135 |
|
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136 |
def fulltext_search_sql(self, field_name): |
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137 |
return 'MATCH (%s) AGAINST (%%s IN BOOLEAN MODE)' % field_name |
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138 |
|
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139 |
def no_limit_value(self): |
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140 |
# 2**64 - 1, as recommended by the MySQL documentation |
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141 |
return 18446744073709551615L |
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142 |
|
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143 |
def quote_name(self, name): |
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144 |
if name.startswith("`") and name.endswith("`"): |
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145 |
return name # Quoting once is enough. |
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146 |
return "`%s`" % name |
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147 |
|
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148 |
def random_function_sql(self): |
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149 |
return 'RAND()' |
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150 |
|
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151 |
def sql_flush(self, style, tables, sequences): |
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152 |
# NB: The generated SQL below is specific to MySQL |
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153 |
# 'TRUNCATE x;', 'TRUNCATE y;', 'TRUNCATE z;'... style SQL statements |
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154 |
# to clear all tables of all data |
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155 |
if tables: |
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156 |
sql = ['SET FOREIGN_KEY_CHECKS = 0;'] |
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157 |
for table in tables: |
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158 |
sql.append('%s %s;' % (style.SQL_KEYWORD('TRUNCATE'), style.SQL_FIELD(self.quote_name(table)))) |
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159 |
sql.append('SET FOREIGN_KEY_CHECKS = 1;') |
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160 |
|
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161 |
# 'ALTER TABLE table AUTO_INCREMENT = 1;'... style SQL statements |
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162 |
# to reset sequence indices |
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163 |
sql.extend(["%s %s %s %s %s;" % \ |
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164 |
(style.SQL_KEYWORD('ALTER'), |
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165 |
style.SQL_KEYWORD('TABLE'), |
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166 |
style.SQL_TABLE(self.quote_name(sequence['table'])), |
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167 |
style.SQL_KEYWORD('AUTO_INCREMENT'), |
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168 |
style.SQL_FIELD('= 1'), |
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169 |
) for sequence in sequences]) |
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170 |
return sql |
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171 |
else: |
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172 |
return [] |
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173 |
|
323
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174 |
def value_to_db_datetime(self, value): |
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175 |
if value is None: |
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176 |
return None |
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177 |
|
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178 |
# MySQL doesn't support tz-aware datetimes |
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179 |
if value.tzinfo is not None: |
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180 |
raise ValueError("MySQL backend does not support timezone-aware datetimes.") |
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181 |
|
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182 |
# MySQL doesn't support microseconds |
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|
183 |
return unicode(value.replace(microsecond=0)) |
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|
184 |
|
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|
185 |
def value_to_db_time(self, value): |
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186 |
if value is None: |
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|
187 |
return None |
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|
188 |
|
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189 |
# MySQL doesn't support tz-aware datetimes |
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190 |
if value.tzinfo is not None: |
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|
191 |
raise ValueError("MySQL backend does not support timezone-aware datetimes.") |
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|
192 |
|
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193 |
# MySQL doesn't support microseconds |
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|
194 |
return unicode(value.replace(microsecond=0)) |
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195 |
|
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196 |
def year_lookup_bounds(self, value): |
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197 |
# Again, no microseconds |
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198 |
first = '%s-01-01 00:00:00' |
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199 |
second = '%s-12-31 23:59:59.99' |
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200 |
return [first % value, second % value] |
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|
201 |
|
54
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202 |
class DatabaseWrapper(BaseDatabaseWrapper): |
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203 |
|
54
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204 |
operators = { |
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205 |
'exact': '= %s', |
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206 |
'iexact': 'LIKE %s', |
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207 |
'contains': 'LIKE BINARY %s', |
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208 |
'icontains': 'LIKE %s', |
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209 |
'regex': 'REGEXP BINARY %s', |
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210 |
'iregex': 'REGEXP %s', |
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211 |
'gt': '> %s', |
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212 |
'gte': '>= %s', |
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213 |
'lt': '< %s', |
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214 |
'lte': '<= %s', |
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215 |
'startswith': 'LIKE BINARY %s', |
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216 |
'endswith': 'LIKE BINARY %s', |
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217 |
'istartswith': 'LIKE %s', |
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218 |
'iendswith': 'LIKE %s', |
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} |
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|
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def __init__(self, **kwargs): |
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super(DatabaseWrapper, self).__init__(**kwargs) |
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self.server_version = None |
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|
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self.features = DatabaseFeatures() |
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self.ops = DatabaseOperations() |
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self.client = DatabaseClient() |
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self.creation = DatabaseCreation(self) |
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self.introspection = DatabaseIntrospection(self) |
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self.validation = DatabaseValidation() |
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|
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def _valid_connection(self): |
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if self.connection is not None: |
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try: |
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self.connection.ping() |
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return True |
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except DatabaseError: |
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self.connection.close() |
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self.connection = None |
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return False |
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|
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def _cursor(self, settings): |
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if not self._valid_connection(): |
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kwargs = { |
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'conv': django_conversions, |
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'charset': 'utf8', |
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'use_unicode': True, |
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} |
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if settings.DATABASE_USER: |
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kwargs['user'] = settings.DATABASE_USER |
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if settings.DATABASE_NAME: |
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kwargs['db'] = settings.DATABASE_NAME |
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if settings.DATABASE_PASSWORD: |
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kwargs['passwd'] = settings.DATABASE_PASSWORD |
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if settings.DATABASE_HOST.startswith('/'): |
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kwargs['unix_socket'] = settings.DATABASE_HOST |
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elif settings.DATABASE_HOST: |
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kwargs['host'] = settings.DATABASE_HOST |
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if settings.DATABASE_PORT: |
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kwargs['port'] = int(settings.DATABASE_PORT) |
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kwargs.update(self.options) |
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self.connection = Database.connect(**kwargs) |
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cursor = CursorWrapper(self.connection.cursor()) |
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return cursor |
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|
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def _rollback(self): |
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try: |
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BaseDatabaseWrapper._rollback(self) |
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except Database.NotSupportedError: |
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pass |
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|
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def get_server_version(self): |
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if not self.server_version: |
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if not self._valid_connection(): |
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self.cursor() |
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m = server_version_re.match(self.connection.get_server_info()) |
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if not m: |
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raise Exception('Unable to determine MySQL version from version string %r' % self.connection.get_server_info()) |
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self.server_version = tuple([int(x) for x in m.groups()]) |
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return self.server_version |