The table below shows the ADO Data Type mapping between Access, SQL Server, and Oracle:
DataType Enum
Value
Access
SQLServer
Oracle
adBigInt
20
BigInt (SQL Server 2000 +)
adBinary
128
Binary
TimeStamp
Raw *
adBoolean
11
YesNo
Bit
adChar
129
Char
Char
adCurrency
6
Currency
Money
SmallMoney
adDate
7
Date
DateTime
adDBTimeStamp
135
DateTime (Access 97 (ODBC))
DateTime
SmallDateTime
Date
adDecimal
14
Decimal *
adDouble
5
Double
Float
Float
adGUID
72
ReplicationID (Access 97 (OLEDB)), (Access 2000 (OLEDB))
UniqueIdentifier (SQL Server 7.0 +)
adIDispatch
9
adInteger
3
AutoNumber
Integer
Long
Identity (SQL Server 6.5)
Int
Int *
adLongVarBinary
205
OLEObject
Image
Long Raw *
Blob (Oracle 8.1.x)
adLongVarChar
201
Memo (Access 97)
Hyperlink (Access 97)
Text
Long *
Clob (Oracle 8.1.x)
adLongVarWChar
203
Memo (Access 2000 (OLEDB))
Hyperlink (Access 2000 (OLEDB))
NText (SQL Server 7.0 +)
NClob (Oracle 8.1.x)
adNumeric
131
Decimal (Access 2000 (OLEDB))
Decimal
Numeric
Decimal
Integer
Number
SmallInt
adSingle
4
Single
Real
adSmallInt
2
Integer
SmallInt
adUnsignedTinyInt
17
Byte
TinyInt
adVarBinary
204
ReplicationID (Access 97)
VarBinary
adVarChar
200
Text (Access 97)
VarChar
VarChar
adVariant
12
Sql_Variant (SQL Server 2000 +)
VarChar2
adVarWChar
202
Text (Access 2000 (OLEDB))
NVarChar (SQL Server 7.0 +)
NVarChar2
adWChar
130
NChar (SQL Server 7.0 +)
* In Oracle 8.0.x - decimal and int are equal to number and number(10).
[url=http://blog.csdn.net/wukong777/archive/2004/10/09/128782.aspx][/url]