author | Todd Larsen <tlarsen@google.com> |
Thu, 28 Aug 2008 22:27:40 +0000 | |
changeset 118 | d2e61a490969 |
parent 54 | 03e267d67478 |
child 323 | ff1a9aa48cfd |
permissions | -rw-r--r-- |
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""" |
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Oracle database backend for Django. |
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|
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Requires cx_Oracle: http://www.python.net/crew/atuining/cx_Oracle/ |
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""" |
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|
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import os |
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|
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from django.db.backends import BaseDatabaseWrapper, BaseDatabaseFeatures, BaseDatabaseOperations, util |
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from django.db.backends.oracle import query |
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from django.utils.datastructures import SortedDict |
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from django.utils.encoding import smart_str, force_unicode |
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|
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# Oracle takes client-side character set encoding from the environment. |
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os.environ['NLS_LANG'] = '.UTF8' |
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try: |
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import cx_Oracle 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 cx_Oracle module: %s" % e) |
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|
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DatabaseError = Database.Error |
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IntegrityError = Database.IntegrityError |
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|
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class DatabaseFeatures(BaseDatabaseFeatures): |
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allows_group_by_ordinal = False |
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allows_unique_and_pk = False # Suppress UNIQUE/PK for Oracle (ORA-02259) |
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empty_fetchmany_value = () |
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needs_datetime_string_cast = False |
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needs_upper_for_iops = True |
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supports_tablespaces = True |
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uses_case_insensitive_names = True |
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uses_custom_query_class = True |
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|
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class DatabaseOperations(BaseDatabaseOperations): |
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def autoinc_sql(self, table, column): |
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# To simulate auto-incrementing primary keys in Oracle, we have to |
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# create a sequence and a trigger. |
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sq_name = get_sequence_name(table) |
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tr_name = get_trigger_name(table) |
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tbl_name = self.quote_name(table) |
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col_name = self.quote_name(column) |
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sequence_sql = 'CREATE SEQUENCE %s;' % sq_name |
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trigger_sql = """ |
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CREATE OR REPLACE TRIGGER %(tr_name)s |
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BEFORE INSERT ON %(tbl_name)s |
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FOR EACH ROW |
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WHEN (new.%(col_name)s IS NULL) |
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BEGIN |
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SELECT %(sq_name)s.nextval |
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INTO :new.%(col_name)s FROM dual; |
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END; |
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/""" % locals() |
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return sequence_sql, trigger_sql |
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|
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def date_extract_sql(self, lookup_type, field_name): |
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# http://download-east.oracle.com/docs/cd/B10501_01/server.920/a96540/functions42a.htm#1017163 |
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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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# Oracle uses TRUNC() for both dates and numbers. |
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# http://download-east.oracle.com/docs/cd/B10501_01/server.920/a96540/functions155a.htm#SQLRF06151 |
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if lookup_type == 'day': |
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sql = 'TRUNC(%s)' % field_name |
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else: |
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sql = "TRUNC(%s, '%s')" % (field_name, lookup_type) |
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return sql |
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def datetime_cast_sql(self): |
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return "TO_TIMESTAMP(%s, 'YYYY-MM-DD HH24:MI:SS.FF')" |
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def deferrable_sql(self): |
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return " DEFERRABLE INITIALLY DEFERRED" |
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|
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def drop_sequence_sql(self, table): |
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return "DROP SEQUENCE %s;" % self.quote_name(get_sequence_name(table)) |
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def field_cast_sql(self, db_type): |
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if db_type and db_type.endswith('LOB'): |
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return "DBMS_LOB.SUBSTR(%s)" |
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else: |
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return "%s" |
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|
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def last_insert_id(self, cursor, table_name, pk_name): |
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sq_name = util.truncate_name(table_name, self.max_name_length() - 3) |
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cursor.execute('SELECT %s_sq.currval FROM dual' % sq_name) |
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return cursor.fetchone()[0] |
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|
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def limit_offset_sql(self, limit, offset=None): |
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# Limits and offset are too complicated to be handled here. |
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# Instead, they are handled in django/db/backends/oracle/query.py. |
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return "" |
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|
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def lookup_cast(self, lookup_type): |
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if lookup_type in ('iexact', 'icontains', 'istartswith', 'iendswith'): |
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return "UPPER(%s)" |
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return "%s" |
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|
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def max_name_length(self): |
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return 30 |
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|
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def query_class(self, DefaultQueryClass): |
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return query.query_class(DefaultQueryClass, Database) |
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|
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def quote_name(self, name): |
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# SQL92 requires delimited (quoted) names to be case-sensitive. When |
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# not quoted, Oracle has case-insensitive behavior for identifiers, but |
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# always defaults to uppercase. |
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# We simplify things by making Oracle identifiers always uppercase. |
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if not name.startswith('"') and not name.endswith('"'): |
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name = '"%s"' % util.truncate_name(name.upper(), self.max_name_length()) |
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return name.upper() |
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113 |
|
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114 |
def random_function_sql(self): |
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115 |
return "DBMS_RANDOM.RANDOM" |
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116 |
|
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117 |
def regex_lookup_9(self, lookup_type): |
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118 |
raise NotImplementedError("Regexes are not supported in Oracle before version 10g.") |
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119 |
|
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120 |
def regex_lookup_10(self, lookup_type): |
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121 |
if lookup_type == 'regex': |
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122 |
match_option = "'c'" |
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123 |
else: |
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124 |
match_option = "'i'" |
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125 |
return 'REGEXP_LIKE(%%s, %%s, %s)' % match_option |
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126 |
|
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127 |
def regex_lookup(self, lookup_type): |
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128 |
# If regex_lookup is called before it's been initialized, then create |
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129 |
# a cursor to initialize it and recur. |
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130 |
from django.db import connection |
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131 |
connection.cursor() |
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132 |
return connection.ops.regex_lookup(lookup_type) |
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133 |
|
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134 |
def sql_flush(self, style, tables, sequences): |
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135 |
# Return a list of 'TRUNCATE x;', 'TRUNCATE y;', |
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136 |
# 'TRUNCATE z;'... style SQL statements |
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137 |
if tables: |
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138 |
# Oracle does support TRUNCATE, but it seems to get us into |
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139 |
# FK referential trouble, whereas DELETE FROM table works. |
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140 |
sql = ['%s %s %s;' % \ |
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141 |
(style.SQL_KEYWORD('DELETE'), |
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142 |
style.SQL_KEYWORD('FROM'), |
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143 |
style.SQL_FIELD(self.quote_name(table)) |
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144 |
) for table in tables] |
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145 |
# Since we've just deleted all the rows, running our sequence |
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146 |
# ALTER code will reset the sequence to 0. |
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147 |
for sequence_info in sequences: |
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148 |
table_name = sequence_info['table'] |
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149 |
seq_name = get_sequence_name(table_name) |
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150 |
column_name = self.quote_name(sequence_info['column'] or 'id') |
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151 |
query = _get_sequence_reset_sql() % {'sequence': seq_name, |
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152 |
'table': self.quote_name(table_name), |
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153 |
'column': column_name} |
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154 |
sql.append(query) |
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155 |
return sql |
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156 |
else: |
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157 |
return [] |
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158 |
|
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159 |
def sequence_reset_sql(self, style, model_list): |
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160 |
from django.db import models |
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161 |
output = [] |
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162 |
query = _get_sequence_reset_sql() |
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163 |
for model in model_list: |
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164 |
for f in model._meta.fields: |
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165 |
if isinstance(f, models.AutoField): |
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166 |
sequence_name = get_sequence_name(model._meta.db_table) |
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167 |
column_name = self.quote_name(f.db_column or f.name) |
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168 |
output.append(query % {'sequence': sequence_name, |
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169 |
'table': model._meta.db_table, |
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170 |
'column': column_name}) |
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171 |
break # Only one AutoField is allowed per model, so don't bother continuing. |
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172 |
for f in model._meta.many_to_many: |
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173 |
sequence_name = get_sequence_name(f.m2m_db_table()) |
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174 |
output.append(query % {'sequence': sequence_name, |
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175 |
'table': f.m2m_db_table(), |
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176 |
'column': self.quote_name('id')}) |
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177 |
return output |
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178 |
|
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179 |
def start_transaction_sql(self): |
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180 |
return '' |
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181 |
|
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182 |
def tablespace_sql(self, tablespace, inline=False): |
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183 |
return "%sTABLESPACE %s" % ((inline and "USING INDEX " or ""), self.quote_name(tablespace)) |
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184 |
|
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185 |
class DatabaseWrapper(BaseDatabaseWrapper): |
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186 |
features = DatabaseFeatures() |
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187 |
ops = DatabaseOperations() |
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188 |
operators = { |
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189 |
'exact': '= %s', |
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190 |
'iexact': '= UPPER(%s)', |
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191 |
'contains': "LIKEC %s ESCAPE '\\'", |
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192 |
'icontains': "LIKEC UPPER(%s) ESCAPE '\\'", |
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193 |
'gt': '> %s', |
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194 |
'gte': '>= %s', |
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195 |
'lt': '< %s', |
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196 |
'lte': '<= %s', |
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197 |
'startswith': "LIKEC %s ESCAPE '\\'", |
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198 |
'endswith': "LIKEC %s ESCAPE '\\'", |
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199 |
'istartswith': "LIKEC UPPER(%s) ESCAPE '\\'", |
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200 |
'iendswith': "LIKEC UPPER(%s) ESCAPE '\\'", |
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201 |
} |
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202 |
oracle_version = None |
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203 |
|
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204 |
def _valid_connection(self): |
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205 |
return self.connection is not None |
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206 |
|
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207 |
def _cursor(self, settings): |
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208 |
cursor = None |
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209 |
if not self._valid_connection(): |
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210 |
if len(settings.DATABASE_HOST.strip()) == 0: |
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211 |
settings.DATABASE_HOST = 'localhost' |
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212 |
if len(settings.DATABASE_PORT.strip()) != 0: |
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213 |
dsn = Database.makedsn(settings.DATABASE_HOST, int(settings.DATABASE_PORT), settings.DATABASE_NAME) |
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214 |
self.connection = Database.connect(settings.DATABASE_USER, settings.DATABASE_PASSWORD, dsn, **self.options) |
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215 |
else: |
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216 |
conn_string = "%s/%s@%s" % (settings.DATABASE_USER, settings.DATABASE_PASSWORD, settings.DATABASE_NAME) |
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217 |
self.connection = Database.connect(conn_string, **self.options) |
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218 |
cursor = FormatStylePlaceholderCursor(self.connection) |
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219 |
# Set oracle date to ansi date format. This only needs to execute |
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220 |
# once when we create a new connection. |
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221 |
cursor.execute("ALTER SESSION SET NLS_DATE_FORMAT = 'YYYY-MM-DD' " |
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222 |
"NLS_TIMESTAMP_FORMAT = 'YYYY-MM-DD HH24:MI:SS.FF'") |
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223 |
try: |
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224 |
self.oracle_version = int(self.connection.version.split('.')[0]) |
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225 |
# There's no way for the DatabaseOperations class to know the |
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226 |
# currently active Oracle version, so we do some setups here. |
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227 |
# TODO: Multi-db support will need a better solution (a way to |
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# communicate the current version). |
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229 |
if self.oracle_version <= 9: |
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self.ops.regex_lookup = self.ops.regex_lookup_9 |
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231 |
else: |
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232 |
self.ops.regex_lookup = self.ops.regex_lookup_10 |
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233 |
except ValueError: |
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234 |
pass |
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235 |
try: |
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236 |
self.connection.stmtcachesize = 20 |
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237 |
except: |
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238 |
# Django docs specify cx_Oracle version 4.3.1 or higher, but |
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239 |
# stmtcachesize is available only in 4.3.2 and up. |
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240 |
pass |
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241 |
if not cursor: |
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242 |
cursor = FormatStylePlaceholderCursor(self.connection) |
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243 |
# Default arraysize of 1 is highly sub-optimal. |
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cursor.arraysize = 100 |
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245 |
return cursor |
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246 |
|
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class FormatStylePlaceholderCursor(Database.Cursor): |
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""" |
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249 |
Django uses "format" (e.g. '%s') style placeholders, but Oracle uses ":var" |
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250 |
style. This fixes it -- but note that if you want to use a literal "%s" in |
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251 |
a query, you'll need to use "%%s". |
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252 |
|
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We also do automatic conversion between Unicode on the Python side and |
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254 |
UTF-8 -- for talking to Oracle -- in here. |
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255 |
""" |
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256 |
charset = 'utf-8' |
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257 |
|
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258 |
def _format_params(self, params): |
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if isinstance(params, dict): |
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result = {} |
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charset = self.charset |
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262 |
for key, value in params.items(): |
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result[smart_str(key, charset)] = smart_str(value, charset) |
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return result |
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265 |
else: |
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return tuple([smart_str(p, self.charset, True) for p in params]) |
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267 |
|
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268 |
def _guess_input_sizes(self, params_list): |
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# Mark any string parameter greater than 4000 characters as an NCLOB. |
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270 |
if isinstance(params_list[0], dict): |
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sizes = {} |
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iterators = [params.iteritems() for params in params_list] |
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273 |
else: |
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274 |
sizes = [None] * len(params_list[0]) |
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iterators = [enumerate(params) for params in params_list] |
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276 |
for iterator in iterators: |
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277 |
for key, value in iterator: |
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278 |
if isinstance(value, basestring) and len(value) > 4000: |
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279 |
sizes[key] = Database.NCLOB |
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280 |
if isinstance(sizes, dict): |
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281 |
self.setinputsizes(**sizes) |
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282 |
else: |
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283 |
self.setinputsizes(*sizes) |
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284 |
|
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285 |
def execute(self, query, params=None): |
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286 |
if params is None: |
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287 |
params = [] |
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288 |
else: |
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289 |
params = self._format_params(params) |
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args = [(':arg%d' % i) for i in range(len(params))] |
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291 |
# cx_Oracle wants no trailing ';' for SQL statements. For PL/SQL, it |
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292 |
# it does want a trailing ';' but not a trailing '/'. However, these |
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293 |
# characters must be included in the original query in case the query |
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294 |
# is being passed to SQL*Plus. |
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295 |
if query.endswith(';') or query.endswith('/'): |
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296 |
query = query[:-1] |
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297 |
query = smart_str(query, self.charset) % tuple(args) |
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298 |
self._guess_input_sizes([params]) |
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299 |
return Database.Cursor.execute(self, query, params) |
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300 |
|
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301 |
def executemany(self, query, params=None): |
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302 |
try: |
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303 |
args = [(':arg%d' % i) for i in range(len(params[0]))] |
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304 |
except (IndexError, TypeError): |
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305 |
# No params given, nothing to do |
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306 |
return None |
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307 |
# cx_Oracle wants no trailing ';' for SQL statements. For PL/SQL, it |
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308 |
# it does want a trailing ';' but not a trailing '/'. However, these |
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309 |
# characters must be included in the original query in case the query |
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310 |
# is being passed to SQL*Plus. |
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311 |
if query.endswith(';') or query.endswith('/'): |
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312 |
query = query[:-1] |
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313 |
query = smart_str(query, self.charset) % tuple(args) |
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314 |
new_param_list = [self._format_params(i) for i in params] |
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315 |
self._guess_input_sizes(new_param_list) |
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316 |
return Database.Cursor.executemany(self, query, new_param_list) |
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317 |
|
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318 |
def fetchone(self): |
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319 |
row = Database.Cursor.fetchone(self) |
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320 |
if row is None: |
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321 |
return row |
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322 |
return tuple([to_unicode(e) for e in row]) |
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323 |
|
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324 |
def fetchmany(self, size=None): |
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325 |
if size is None: |
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326 |
size = self.arraysize |
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327 |
return tuple([tuple([to_unicode(e) for e in r]) for r in Database.Cursor.fetchmany(self, size)]) |
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328 |
|
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329 |
def fetchall(self): |
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330 |
return tuple([tuple([to_unicode(e) for e in r]) for r in Database.Cursor.fetchall(self)]) |
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331 |
|
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332 |
def to_unicode(s): |
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333 |
""" |
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334 |
Convert strings to Unicode objects (and return all other data types |
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335 |
unchanged). |
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336 |
""" |
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337 |
if isinstance(s, basestring): |
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338 |
return force_unicode(s) |
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339 |
return s |
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340 |
|
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341 |
def _get_sequence_reset_sql(): |
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# TODO: colorize this SQL code with style.SQL_KEYWORD(), etc. |
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343 |
return """ |
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344 |
DECLARE |
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345 |
startvalue integer; |
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346 |
cval integer; |
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347 |
BEGIN |
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LOCK TABLE %(table)s IN SHARE MODE; |
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SELECT NVL(MAX(%(column)s), 0) INTO startvalue FROM %(table)s; |
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SELECT %(sequence)s.nextval INTO cval FROM dual; |
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cval := startvalue - cval; |
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IF cval != 0 THEN |
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EXECUTE IMMEDIATE 'ALTER SEQUENCE %(sequence)s MINVALUE 0 INCREMENT BY '||cval; |
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SELECT %(sequence)s.nextval INTO cval FROM dual; |
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EXECUTE IMMEDIATE 'ALTER SEQUENCE %(sequence)s INCREMENT BY 1'; |
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END IF; |
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COMMIT; |
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END; |
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/""" |
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360 |
|
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def get_sequence_name(table): |
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name_length = DatabaseOperations().max_name_length() - 3 |
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return '%s_SQ' % util.truncate_name(table, name_length).upper() |
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364 |
|
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def get_trigger_name(table): |
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name_length = DatabaseOperations().max_name_length() - 3 |
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return '%s_TR' % util.truncate_name(table, name_length).upper() |