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-rw-r--r--lib/sqlalchemy/databases/sqlite.py22
1 files changed, 22 insertions, 0 deletions
diff --git a/lib/sqlalchemy/databases/sqlite.py b/lib/sqlalchemy/databases/sqlite.py
index 77eb30ff8..b77a315b8 100644
--- a/lib/sqlalchemy/databases/sqlite.py
+++ b/lib/sqlalchemy/databases/sqlite.py
@@ -557,12 +557,34 @@ class SQLiteCompiler(compiler.DefaultCompiler):
}
)
+ extract_map = compiler.DefaultCompiler.extract_map.copy()
+ extract_map.update({
+ 'month': '%m',
+ 'day': '%d',
+ 'year': '%Y',
+ 'second': '%S',
+ 'hour': '%H',
+ 'doy': '%j',
+ 'minute': '%M',
+ 'epoch': '%s',
+ 'dow': '%w',
+ 'week': '%W'
+ })
+
def visit_cast(self, cast, **kwargs):
if self.dialect.supports_cast:
return super(SQLiteCompiler, self).visit_cast(cast)
else:
return self.process(cast.clause)
+ def visit_extract(self, extract):
+ try:
+ return "CAST(STRFTIME('%s', %s) AS INTEGER)" % (
+ self.extract_map[extract.field], self.process(extract.expr))
+ except KeyError:
+ raise exc.ArgumentError(
+ "%s is not a valid extract argument." % extract.field)
+
def limit_clause(self, select):
text = ""
if select._limit is not None: