Added float type to support real/double precision/float8/etc sql data types. Added columns.py as unit test. Modified sqlite.py, postgres.py and mysql.py to use the new type where appropriate (note -Oracle is unchanged at present).

4 files changed, 25 insertions, 3 deletions

diff --git a/lib/sqlalchemy/databases/mysql.py b/lib/sqlalchemy/databases/mysql.py
index 45d85187a..429ffc0fd 100644
--- a/lib/sqlalchemy/databases/mysql.py
+++ b/lib/sqlalchemy/databases/mysql.py
@@ -33,6 +33,9 @@ except:
 class MSNumeric(sqltypes.Numeric):
     def get_col_spec(self):
         return "NUMERIC(%(precision)s, %(length)s)" % {'precision': self.precision, 'length' : self.length}
+class MSFloat(sqltypes.Float):
+    def get_col_spec(self):
+        return "FLOAT(%(precision)s)" % {'precision': self.precision}
 class MSInteger(sqltypes.Integer):
     def get_col_spec(self):
         return "INTEGER"
@@ -58,6 +61,7 @@ class MSBoolean(sqltypes.Boolean):
 colspecs = {
     sqltypes.Integer : MSInteger,
     sqltypes.Numeric : MSNumeric,
+    sqltypes.Float : MSFloat,
     sqltypes.DateTime : MSDateTime,
     sqltypes.String : MSString,
     sqltypes.Binary : MSBinary,
@@ -72,6 +76,7 @@ ischema_names = {
     'char' : MSChar,
     'text' : MSText,
     'decimal' : MSNumeric,
+    'float' : MSFloat,
     'timestamp' : MSDateTime,
     'binary' : MSBinary,
 }
diff --git a/lib/sqlalchemy/databases/postgres.py b/lib/sqlalchemy/databases/postgres.py
index c8e742fe4..75b9e1aee 100644
--- a/lib/sqlalchemy/databases/postgres.py
+++ b/lib/sqlalchemy/databases/postgres.py
@@ -36,6 +36,9 @@ except:
 class PGNumeric(sqltypes.Numeric):
     def get_col_spec(self):
         return "NUMERIC(%(precision)s, %(length)s)" % {'precision': self.precision, 'length' : self.length}
+class PGFloat(sqltypes.Float):
+    def get_col_spec(self):
+        return "FLOAT(%(precision)s)" % {'precision': self.precision}
 class PGInteger(sqltypes.Integer):
     def get_col_spec(self):
         return "INTEGER"
@@ -70,6 +73,7 @@ class PGBoolean(sqltypes.Boolean):
 pg2_colspecs = {
     sqltypes.Integer : PGInteger,
     sqltypes.Numeric : PGNumeric,
+    sqltypes.Float : PGFloat,
     sqltypes.DateTime : PG2DateTime,
     sqltypes.String : PGString,
     sqltypes.Binary : PGBinary,
@@ -82,12 +86,17 @@ pg1_colspecs[sqltypes.DateTime] = PG1DateTime
 
 pg2_ischema_names = {
     'integer' : PGInteger,
+    'bigint' : PGInteger,
     'character varying' : PGString,
     'character' : PGChar,
     'text' : PGText,
     'numeric' : PGNumeric,
+    'float' : PGFloat,
+    'real' : PGFloat,
+    'double precision' : PGFloat,
     'timestamp without time zone' : PG2DateTime,
     'bytea' : PGBinary,
+    'boolean' : PGBoolean,
 }
 pg1_ischema_names = pg2_ischema_names.copy()
 pg1_ischema_names['timestamp without time zone'] = PG1DateTime
diff --git a/lib/sqlalchemy/databases/sqlite.py b/lib/sqlalchemy/databases/sqlite.py
index 1a00c555b..845efdf33 100644
--- a/lib/sqlalchemy/databases/sqlite.py
+++ b/lib/sqlalchemy/databases/sqlite.py
@@ -68,6 +68,7 @@ class SLBoolean(sqltypes.Boolean):
 colspecs = {
     sqltypes.Integer : SLInteger,
     sqltypes.Numeric : SLNumeric,
+    sqltypes.Float : SLNumeric,
     sqltypes.DateTime : SLDateTime,
     sqltypes.String : SLString,
     sqltypes.Binary : SLBinary,
@@ -82,6 +83,7 @@ pragma_names = {
     'CHAR' : SLChar,
     'TEXT' : SLText,
     'NUMERIC' : SLNumeric,
+    'FLOAT' : SLNumeric,
     'TIMESTAMP' : SLDateTime,
     'BLOB' : SLBinary,
 }
diff --git a/lib/sqlalchemy/types.py b/lib/sqlalchemy/types.py
index fc29f8056..520e379a2 100644
--- a/lib/sqlalchemy/types.py
+++ b/lib/sqlalchemy/types.py
@@ -17,7 +17,7 @@
 
 __all__ = [ 'TypeEngine', 'TypeDecorator', 'NullTypeEngine',
             'INT', 'CHAR', 'VARCHAR', 'TEXT', 'FLOAT', 'DECIMAL', 
-            'TIMESTAMP', 'DATETIME', 'CLOB', 'BLOB', 'BOOLEAN', 'String', 'Integer', 'Numeric', 'DateTime', 'Binary', 'Boolean', 'NULLTYPE'
+            'TIMESTAMP', 'DATETIME', 'CLOB', 'BLOB', 'BOOLEAN', 'String', 'Integer', 'Numeric', 'Float', 'DateTime', 'Binary', 'Boolean', 'NULLTYPE'
             ]
 
 
@@ -89,6 +89,12 @@ class Numeric(NullTypeEngine):
     def adapt(self, typeobj):
         return typeobj(self.precision, self.length)
 
+class Float(NullTypeEngine):
+    def __init__(self, precision = 10):
+        self.precision = precision
+    def adapt(self, typeobj):
+        return typeobj(self.precision)
+
 class DateTime(NullTypeEngine):
     pass
 
@@ -98,7 +104,7 @@ class Binary(NullTypeEngine):
 class Boolean(NullTypeEngine):
     pass
 
-class FLOAT(Numeric):pass
+class FLOAT(Float):pass
 class TEXT(String):pass
 class DECIMAL(Numeric):pass
 class INT(Integer):pass
@@ -111,4 +117,4 @@ class CHAR(String):pass
 class BLOB(Binary): pass
 class BOOLEAN(Boolean): pass
 
-NULLTYPE = NullTypeEngine()
\ No newline at end of file
+NULLTYPE = NullTypeEngine()