How to: Use Data-at-Execution Parameters (ODBC)

新建日期： 2006 年 4 月 14 日

To use data-at-execution text, ntext, or image parameters

When calling SQLBindParameter to bind a program buffer to the statement parameter:
- For the last parameter, use SQL_LEN_DATA_AT_EXEC(length) where length is the total length of the text, ntext, or image parameter data in bytes.
- Use an rgbValue (eighth parameter) of a program-defined parameter identifier.
Calling SQLExecDirect or SQLExecute returns SQL_NEED_DATA, which indicates that data-at-execution parameters are ready for processing.
For each data-at-execution parameter:
- Call SQLParamData to get the program-defined parameter ID. It will return SQL_NEED_DATA if there is another data-at-execution parameter.
- Call SQLPutData one or more times, to send the parameter data, until length is sent.
Call SQLParamData to indicate that all the data for the final data-at-execution parameter is sent. It will not return SQL_NEED_DATA.