# ADO CreateParameter Method

Complete Command Object Reference

The CreateParameter method creates and returns a Parameter object containing the specified properties like name, type, direction, size, and value.

Note: This method does not automatically add the new Parameter to the collection. To add the Parameter to the Parameters Collection, use the Append property.

### Syntax

Set objparameter=objcommand.CreateParameter (name,type,direction,size,value)

Parameter | Description
--- | ---
name | Optional. The name of the Parameter object.
type | Optional. One of the DataTypeEnum constants that specifies the data type for the Parameter object. Default is adEmpty. If you choose a variable-length data type, you will also need to specify the Size parameter or the Size property. If you specify adDecimal or adNumeric data type, you must also set the NumericScale and the Precision properties of the Parameter object.
direction | Optional. One of the ParameterDirectionEnum constants that defines the direction of the Parameter object. Default is adParamInput.
size | Optional. Specifies the length of a variable-length data type, if such a type was declared in the Type parameter. Default is zero.
value | Optional. The value of the Parameter object

### DataTypeEnum Values

Specifies the data type of a Field, Parameter, or Property object

Constant | Value | Description
--- | --- | ---
adEmpty | 0 | No value
adSmallInt | 2 | A 2-byte signed integer.
adInteger | 3 | A 4-byte signed integer.
adSingle | 4 | A single-precision floating-point value.
adDouble | 5 | A double-precision floating-point value.
adCurrency | 6 | A currency value
adDate | 7 | The number of days since December 30, 1899 + the fraction of a day.
adBSTR | 8 | A null-terminated character string.
adIDispatch | 9 | A pointer to an IDispatch interface on a COM object. Note: Currently not supported by ADO.
adError | 10 | A 32-bit error code
adBoolean | 11 | A boolean value.
adVariant | 12 | An Automation Variant. Note: Currently not supported by ADO.
adIUnknown | 13 | A pointer to an IUnknown interface on a COM object. Note: Currently not supported by ADO.
adDecimal | 14 | An exact numeric value with a fixed precision and scale.
adTinyInt | 16 | A 1-byte signed integer.
adUnsignedTinyInt | 17 | A 1-byte unsigned integer.
adUnsignedSmallInt | 18 | A 2-byte unsigned integer.
adUnsignedInt | 19 | A 4-byte unsigned integer.
adBigInt | 20 | An 8-byte signed integer.
adUnsignedBigInt | 21 | An 8-byte unsigned integer.
adFileTime | 64 | The number of 100-nanosecond intervals since January 1,1601
adGUID | 72 | A globally unique identifier (GUID)
adBinary | 128 | A binary value.
adChar | 129 | A string value.
adWChar | 130 | A null-terminated Unicode character string.
adNumeric | 131 | An exact numeric value with a fixed precision and scale.
adUserDefined | 132 | A user-defined variable.
adDBDate | 133 | A date value (yyyymmdd).
adDBTime | 134 | A time value (hhmmss).
adDBTimeStamp | 135 | A date/time stamp (yyyymmddhhmmss plus a fraction in billionths).
adChapter | 136 | A 4-byte chapter value that identifies rows in a child rowset
adPropVariant | 138 | An Automation PROPVARIANT.
adVarNumeric | 139 | A numeric value (Parameter object only).
adVarChar | 200 | A string value (Parameter object only).
adLongVarChar | 201 | A long string value.
adVarWChar | 202 | A null-terminated Unicode character string.
adLongVarWChar | 203 | A long null-terminated Unicode string value.
adVarBinary | 204 | A binary value (Parameter object only).
adLongVarBinary | 205 | A long binary value.
AdArray | 0x2000 | A flag value combined with another data type constant. Indicates an array of that other data type.

### ParameterDirectionEnum Values

Specifies whether the Parameter represents an input parameter, an output parameter, both an input and an output parameter, or the return value from a stored procedure.

Constant | Value | Description
--- | --- | ---
adParamUnknown | 0 | Direction is unknown
adParamInput | 1 | Input parameter
adParamOutput | 2 | Output parameter
adParamInputOutput | 3 | Both input and output parameter
adParamReturnValue | 4 | Return value

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