RAD Studio VCL Reference
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Returns the number of bytes needed to hold the parameter's value in the format used by the corresponding type of database field.
function GetDataSize: Integer;
__fastcall int GetDataSize();
Call GetDataSize to determine the number of bytes used to represent the parameter's value. GetDataSize indicates the buffer size needed before calling the GetData method. The value returned by GetDataSize depends on the Value of the parameter. For some values of DataType, this is always the same:
Value of DataSize | |
ftBoolean |
2 |
ftSmallint |
2 |
ftWord |
2 |
ftAutoInc |
4 |
ftDate |
4 |
ftInteger |
4 |
ftTime |
4 |
ftCurrency |
8 |
ftDateTime |
8 |
ftFloat |
8 |
ftTimeStamp |
16 |
ftBCD |
34 |
ftString |
length of the string + 1 |
ftFixedChar |
length of the string + 1 |
ftVarBytes |
If the value is a Variant array, the number of elements in the array, else 0 |
ftBytes |
If the value is a Variant array, the number of elements in the array, else 0 |
ftBlob |
number of bytes of blob data |
ftFmtMemo |
number of bytes of blob data |
ftGraphic |
number of bytes of blob data |
ftMemo |
length of memo string + 1 |
ftDBaseOle |
number of bytes of blob data |
ftParadoxOle |
number of bytes of blob data |
ftOraBlob |
number of bytes of blob data |
ftOraClob |
number of bytes of blob data |
ftTypedBinary |
number of bytes of data |
ftADT |
0 |
ftArray |
0 |
ftDataSet |
0 |
ftReference |
0 |
ftCursor |
0 |
ftUnknown |
raises an EDatabaseError exception |
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