ArcGIS Field Type /esriFieldTypeDate(转)

ArcGIS Field Type

 

The following table outlines the equivalent field data types in ArcCatalog, ArcObjects, Visual Basic and a selection of DBMSs:

ArcCatalog	esriFieldType (IField::Type)	VB Variable Type (IField::VarType)	Access	SQL Server	Oracle
Short Integer	esriFieldTypeSmallInteger	vbInteger	Number (Integer)	smallint	NUMBER
Long Integer	esriFieldTypeInteger	vbLong	Number (Long Integer)	int	NUMBER
Float	esriFieldTypeSingle	vbSingle	Number (Single)	float	NUMBER
Double	esriFieldTypeDouble	vbDouble	Number (Double)	float	NUMBER
Text	esriFieldTypeString	vbString	Text	varchar	VARCHAR2
Date	esriFieldTypeDate	vbDate	Date/Time	datetime	DATE
Object ID	esriFieldTypeOID	vbLong	AutoNumber (Long Integer)	int	NUMBER(38)
Geometry	esriFieldTypeGeometry	vbDataObject	OLE Object	int	NUMBER(38) or SDO_GEOMETRY
Blob	esriFieldTypeBlob	vbObject	OLE Object	image	NUMBER(38) or SDO_GEOMETRY
Raster	esriFieldTypeRaster	vbDataObject	Number (Long Integer)	int	NUMBER
GUID	esriFieldTypeGUID	vbString	Number (Replication ID)	uniqueidentifier	CHAR
GlobalID	esriFieldTypeGlobalID	vbString	Number (Replication ID)	uniqueidentifier	CHAR

The following table outlines the Coverage, INFO Item to Geodatabase field mapping:

Item type	Item width	Geodatabase field type (esriFieldType)
B	4	esriFieldTypeInteger
C	1-320	esriFieldTypeString
D	8	esriFieldTypeDate
F	4	esriFieldTypeSingle
F	8	esriFieldTypeDouble
I	1-4	esriFieldTypeSmallInteger
I	5-9	esriFieldTypeInteger
I	10-16	esriFieldTypeDouble
N	1-9	esriFieldTypeSingle
N	10-16	esriFieldTypeDouble

The following table outlines the Shapefile, dBASE field to Geodatabase field mapping:

Field type	Field width	Geodatabase field type (esriFieldType)
Date	-	esriFieldTypeDate
String	1-255	esriFieldTypeString
Boolean	-	esriFieldTypeString
Number	1-16 (decimals = 0)	esriFieldTypeInteger
Number	1-16 (decimals > 0)	esriFieldTypeDouble

Note: Shapefiles only support date fields. Time is not supported. Geodatabases support date\time fields. If a shapefiles date field is queried for the time a default value of "12:00:00 AM" will be returned.