Type mapping rules from this table are used by default when generating a model from a database with Entity Data Model Wizard in Visual Studio 2008 - 2022 and Create Model Wizard in Entity Developer.
You may override the default mapping for numeric types in Entity Data Model Wizard using the OracleConnection.NumberMappings property.
Oracle data types | SSDL1 | CSDL1 | .NET |
|---|---|---|---|
| NUMBER(1) | bool | Boolean | System.Boolean |
| NUMBER(2)..NUMBER(9)2 | int | Int32 | System.Int32 |
| NUMBER(10)..NUMBER(18)2 | int64 | Int64 | System.Int64 |
| NUMBER (p, s), where 0 < s < p < 162 | double | Double | System.Double |
| other NUMBERs | decimal | Decimal | System.Decimal |
| FLOAT, REAL, BINARY_FLOAT3, BINARY_DOUBLE3 | the same3 | Decimal | System.Decimal |
| DATE, TIMESTAMP, TIMESTAMP WITH TIME ZONE, TIMESTAMP WITH LOCAL TIME ZONE | the same4 | DateTime | System.DateTime |
| INTERVAL DAY TO SECOND | the same4 | Time | System.TimeSpan |
| CHAR, NCHAR, VARCHAR2, NVARCHAR2, CLOB, NCLOB, ROWID, UROWID, XMLTYPE, INTERVAL YEAR TO MONTH, LONG5 | the same4 | String | System.String |
| BLOB, RAW6, LONG RAW5 | the same4 | Binary | System.Byte[] |
| PL/SQL BOOLEAN | the same4 | Boolean | System.Boolean |
| RAW(16) | guid | Guid | System.Guid |
| PL/SQL BOOLEAN | the same4 | Boolean | System.Boolean |
| SDO_GEOMETRY7 | sdo_geometry4 | Geometry, GeometryCollection, GeometryLineString, GeometryMultiLineString, GeometryMultiPoint, GeometryMultiPolygon, GeometryPoint, GeometryPolygon | DbGeometry |
| SDO_GEOMETRY7 | sdo_geography4 | Geography, GeographyCollection, GeographyLineString, GeographyMultiLineString, GeographyMultiPoint, GeographyMultiPolygon, GeographyPoint, GeographyPolygon | DbGeography |
1 Applicable only to Entity Framework v1 - v6. Not applicable to Entity Framework Core, because Entity Framework Core does not support XML mapping.
2 The negative scale cases are taken into account.
3 BINARY_DOUBLE and BINARY_FLOAT data types appeared in Oracle 10g.
4 These SSDL types completely identical to the corresponding Oracle data types.
5 According to official Oracle recomendations, using of LONG and LONG RAW data types is not recommended.
6 All RAW types, except RAW(16).
7 Supported in Entity Framework v5 and v6.
.NET | CSDL1 | SSDL1 | Oracle data types |
|---|---|---|---|
| System.Boolean | Boolean | bool | NUMBER(1) |
| System.Byte | Byte | byte | NUMBER(3)2 |
| System.Byte[] | Binary | BLOB | BLOB |
| DbGeometry3 | Geometry | sdo_geometry | SDO_GEOMETRY |
| DbGeography3 | Geography | sdo_geography | SDO_GEOMETRY |
| System.DateTime | DateTime | TIMESTAMP | TIMESTAMP |
| System.DateTimeOffset | DateTimeOffset | datetimeoffset | TIMESTAMP WITH TIME ZONE |
| System.Decimal | Decimal | decimal | NUMBER4 |
| System.Double | Double | double | NUMBER |
| System.Guid | Guid | guid | RAW(16) |
| System.Int16 | Int16 | int16 | NUMBER(5)2 |
| System.Int32 | Int32 | int | NUMBER(10)2 |
| System.Int64 | Int64 | int64 | NUMBER(19)2 |
| System.SByte | SByte | sbyte | NUMBER(3)2 |
| System.Single | Single | single | NUMBER(15,5)2 |
| System.String | String | VARCHAR2 | VARCHAR2 |
| System.TimeSpan | Time | INTERVAL DAY TO SECOND | INTERVAL DAY TO SECOND |
1 Applicable only to Entity Framework v1 - v6. Not applicable to Entity Framework Core, because Entity Framework Core does not support XML mapping.
2 Note that when mapping corresponding database data type, you will need the .NET type with larger precision. That is because, for example, any Int32 value can be stored in the NUMBER(10) column, but largest NUMBER(10) column value cannot be stored in the Int32 field, it requires Int64 field.
3 Supported in Entity Framework v5 and v6.
4 Mapping of this type depends on the DecimalPropertyConvention. If this convention is enabled (it is enabled by default), System.Decimal is mapped to NUMBER(18,2). Otherwise, it is mapped to NUMBER.