DataType Enumeration
Indicates the data type of columns in data flow components and the data flow buffer.
Namespace: Microsoft.SqlServer.Dts.Runtime.Wrapper
Assembly: Microsoft.SqlServer.DTSRuntimeWrap (in Microsoft.SqlServer.DTSRuntimeWrap.dll)
Syntax
'Declaration
Public Enumeration DataType
'Usage
Dim instance As DataType
public enum DataType
public enum class DataType
type DataType
public enum DataType
Members
Member name  Description  

DT_EMPTY  A data type that does not have a value. The numeric value is 0.  
DT_NULL  A data type with a value of NULL. The numeric value is 1.  
DT_I2  A 2byte, signed integer. The numeric value is 2.  
DT_I4  A 4byte, signed integer. The numeric value is 3.  
DT_R4  A singleprecision floatingpoint value. The numeric value is 4.  
DT_R8  A doubleprecision floatingpoint value. The numeric value is 5.  
DT_CY  A currency value. This data type is an 8byte value with a scale of 4 and a maximum precision of 19. The numeric value is 6.  
DT_DATE  A date structure that consists of year, month, day, and hour.
The DT_DATE data type is implemented using an 8byte floatingpoint number. Days are represented by whole number increments, starting with 30 December 1899, and midnight as time zero. Hour values are expressed as the absolute value of the fractional part of the number. This means that DT_DATE can represent minutes, seconds, and even milliseconds as well. However, floating point value cannot represent all real values; therefore, there are limits on the range of dates that can be presented in DT_DATE. On the other hand, DT_DBTIMESTAMP is represented by a structure that has individual fields for year, month, day, hours, minutes, seconds, and milliseconds, and this data type has no limits on ranges of the dates it can present. The numeric value is 7. 

DT_BOOL  A Boolean value. The numeric value is 11.  
DT_DECIMAL  An exact numeric value with a fixed precision and a fixed scale. This data type is a 12byte value with a separate sign, a scale of 0 to 28, and a maximum precision of 29. The numeric value is 14.  
DT_I1  A 1byte, signed integer. The numeric value is 16.  
DT_UI1  A 1byte, unsigned integer. The numeric value is 17.  
DT_UI2  A 2byte, unsigned integer. The numeric value is 18.  
DT_UI4  A 4byte, unsigned integer. The numeric value is 19.  
DT_I8  An 8byte, signed integer. The numeric value is 20.  
DT_UI8  An 8byte, unsigned integer. The numeric value is 21.  
DT_FILETIME  A 64bit value that represents the number of 100nanosecond intervals since January 1, 1601. The numeric value is 64.  
DT_GUID  A globally unique identifier (GUID). The numeric value is 72.  
DT_BYTES  A binary data value. The length is variable and the maximum length is 8,000 bytes. The numeric value is 128.  
DT_STR  A nullterminated ANSI/MBCS character string. The numeric value is 129.  
DT_WSTR  A nullterminated Unicode character string. The numeric value is 130.  
DT_NUMERIC  An exact numeric value with a fixed precision and scale. This data type is a 16byte value with a separate sign, a scale of 0 to 38, and a maximum precision of 38. The numeric value is 131.  
DT_DBDATE  A date structure that consists of year, month, and date. The numeric value is 133.  
DT_DBTIME  A time structure that consists of hour, minute, and second. The numeric value is 134.  
DT_DBTIMESTAMP  A timestamp structure that consists of year, month, day, hour, minute, second, and fractional seconds. The fractional seconds have a maximum scale of 3 digits. The numeric value is 135.  
DT_DBTIME2  A time structure that consists of hour, minute, second, and fractional seconds. The fractional seconds have a maximum scale of 7 digits. The numeric value is 145.  
DT_DBTIMESTAMPOFFSET  A timestamp structure that consists of year, month, day, hour, minute, second, and fractional seconds. The fractional seconds have a maximum scale of 7 digits.
The DT_DBTIMESTAMPOFFSET data type also has a time zone offset. This offset specifies the number of hours and minutes that the time is offset from the Coordinated Universal Time (UTC). The time zone offset is used by the system to obtain the local time. The numeric value is 146. 

DT_IMAGE  A binary value with a maximum size of 231–1 (2,147,483,647) bytes. The numeric value is 301.  
DT_TEXT  An ANSI/MBCS character string with a maximum length of 231–1 (2,147,483,647) characters. The numeric value is 302.  
DT_NTEXT  A Unicode character string with a maximum length of 2^30–1 (1,073,741,823) characters. The numeric value is 303.  
DT_DBTIMESTAMP2  A timestamp structure that consists of year, month, day, hour, minute, second, and fractional seconds. The fractional seconds have a maximum scale of 7 digits. The numeric value is 304.  
DT_BYREF_I2  A pointer to a 2byte, signed integer. The numeric value is 16386.  
DT_BYREF_I4  A pointer to a 4byte, signed integer. The numeric value is 16387.  
DT_BYREF_R4  A pointer to a singleprecision floatingpoint value. The numeric value is 16388.  
DT_BYREF_R8  A pointer to a doubleprecision floatingpoint value. The numeric value is 16389.  
DT_BYREF_CY  A pointer to a currency value. This data type is an 8byte value with a scale of 4 and a maximum precision of 19. The numeric value is 16390.  
DT_BYREF_DATE  A pointer to a date structure that consists of year, month, date, and hour. The numeric value is 16391.  
DT_BYREF_BOOL  A pointer to a Boolean value. The numeric value is 16395.  
DT_BYREF_DECIMAL  A pointer to an exact numeric value with a fixed precision and a fixed scale. This data type is a 12byte value with a separate sign, a scale of 0 to 28, and a maximum precision of 29. The numeric value is 16398.  
DT_BYREF_I1  A pointer to a 1byte, signed integer. The numeric value is 16400.  
DT_BYREF_UI1  A pointer to a 1byte, unsigned integer. The numeric value is 16401.  
DT_BYREF_UI2  A pointer to a 2byte, unsigned integer. The numeric value is 16402.  
DT_BYREF_UI4  A pointer to a 4byte, unsigned integer. The numeric value is 16403.  
DT_BYREF_I8  A pointer to an 8byte, signed integer. The numeric value is 16404.  
DT_BYREF_UI8  A pointer to an 8byte, unsigned integer. The numeric value is 16405.  
DT_BYREF_FILETIME  A pointer to a 64bit value that represents the number of 100nanosecond intervals since January 1, 1601. The numeric value is 16448.  
DT_BYREF_GUID  A pointer to a GUID. The numeric value is 16456.  
DT_BYREF_NUMERIC  A pointer to an exact numeric value with a fixed precision and scale. This data type is a 16byte value with a separate sign, a scale of 0 to 38, and a maximum precision of 38. The numeric value is 16515.  
DT_BYREF_DBDATE  A pointer to a date structure that consists of year, month, and date. The numeric value is 16517.  
DT_BYREF_DBTIME  A pointer to a time structure that consists of hour, minute, and second. The numeric value is 16518.  
DT_BYREF_DBTIMESTAMP  A pointer to a timestamp structure that consists of year, month, day, hour, minute, second, and fractional seconds. The fractional seconds have a maximum scale of 3 digits. The numeric value is 16519.  
DT_BYREF_DBTIME2  A pointer to a time structure that consists of hour, minute, second, and fractional seconds. The fractional seconds have a maximum scale of 7 digits. The numeric value is 16520.  
DT_BYREF_DBTIMESTAMPOFFSET  A pointer to a timestamp structure that consists of year, month, day, hour, minute, second, and fractional seconds. The fractional seconds have a maximum scale of 7 digits.
The DT_DBTIMESTAMPOFFSET data type also has a time zone offset. This offset specifies the number of hours and minutes that the time is offset from the Coordinated Universal Time (UTC). The time zone offset is used by the system to obtain the local time. The numeric value is 16521. 

DT_BYREF_DBTIMESTAMP2  A pointer to a timestamp structure that consists of year, month, day, hour, minute, second, and fractional seconds. The fractional seconds have a maximum scale of 7 digits. The numeric value is 16522. 
Remarks
Data types are divided into reference types and value types. Reference types point to an object of the specified type. Value types contain the actual data, not a pointer to the data.
For those data types that are value types, there are times where you need a pointer to their data, not the data itself. In the member table, the DT_BYREF* members are fields that were created to be pointers to value types.
For more information, see Working with Data Types in the Data Flow.
Note
Boolean values are logical values, not numbers. Although Boolean values may be displayed as numbers in some environments, they are not stored as numbers, and various programming languages represent Boolean values as numeric values differently, as do the .NET Framework methods.
For example, the conversion functions available in Visual Basic convert True to 1; however, the System.Convert.ToInt32 method in the .NET Framework converts True to +1. The Integration Services Expression Language converts True to 1.
To avoid errors or unexpected results, you should not write code that relies on particular numeric values for True and False. Wherever possible, you should restrict usage of Boolean variables to the logical values for which they are designed.
For more information about data types, see Integration Services Data Types.