ADO CreateParameter Yöntemi
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CreateParameter yöntemi, ad, tür, yön, boyut ve değer gibi belirtilen özellikleri içeren bir Parameter nesnesi oluşturur ve döndürür.
Not: Bu yöntem, yeni Parametreyi koleksiyona otomatik olarak eklemez. Parametreyi Parametreler Koleksiyonuna eklemek için Ekle özelliğini kullanın.
Sözdizimi
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 Değerleri
Alan, Parametre veya Özellik nesnesinin veri türünü belirtir
| 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 Değerleri
Parametrenin bir giriş parametresini mi, bir çıkış parametresini mi, hem giriş hem de çıkış parametresini mi yoksa saklı bir yordamdan dönüş değerini mi temsil ettiğini belirtir.
| 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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