Difference between revisions of "OpenDBX/C API/odbx row fetch"
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Moreover, it is necessary to fetch all rows from a result set until zero is returned indicating that no more rows are available. Otherwise - depending on the backend - an error may occur after calling [[OpenDBX/API/odbx_result|odbx_result]]() the next time or the outstanding rows will be returned within the next result. | Moreover, it is necessary to fetch all rows from a result set until zero is returned indicating that no more rows are available. Otherwise - depending on the backend - an error may occur after calling [[OpenDBX/API/odbx_result|odbx_result]]() the next time or the outstanding rows will be returned within the next result. | ||
| − | [[OpenDBX/API/odbx_row_fetch|odbx_row_fetch]]() requires a valid '''''result''''' object which was created by [[OpenDBX/API/odbx_result|odbx_result]](). It must not have been feed to [[OpenDBX/API/ | + | [[OpenDBX/API/odbx_row_fetch|odbx_row_fetch]]() requires a valid '''''result''''' object which was created by [[OpenDBX/API/odbx_result|odbx_result]](). It must not have been feed to [[OpenDBX/API/odbx_result_finish|odbx_result_finish]]() before. |
== Return value == | == Return value == | ||
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== Errors == | == Errors == | ||
| − | ; -ODBX_ERR_PARAM : The '''''result''''' parameter is either NULL or the object is invalid. This is usually the case if result has been already feed to [[OpenDBX/API/ | + | ; -ODBX_ERR_PARAM : The '''''result''''' parameter is either NULL or the object is invalid. This is usually the case if result has been already feed to [[OpenDBX/API/odbx_result_finish|odbx_result_finish]](). |
== See also == | == See also == | ||
Revision as of 00:49, 24 May 2008
Retrieve rows from the result set
#include <opendbx/api.h>
int odbx_row_fetch(
odbx_result_t* result )
Description
Retrieves the values of a row from the current result set returned by odbx_result(). Until this function is invoked, no row and field data is available via odbx_field_length() or odbx_field_value() and these functions will return zero respectively NULL.
Moreover, it is necessary to fetch all rows from a result set until zero is returned indicating that no more rows are available. Otherwise - depending on the backend - an error may occur after calling odbx_result() the next time or the outstanding rows will be returned within the next result.
odbx_row_fetch() requires a valid result object which was created by odbx_result(). It must not have been feed to odbx_result_finish() before.
Return value
odbx_row_fetch() will return ODBX_ROW_NEXT ("1") as long as rows are available from the result set. After the last row has been made available, further calls to this function will return ODBX_ROW_DONE ("0") indicating that the result set doesn't contain more rows. The named constants are available since OpenDBX 1.3.2 and the numbers in brackets have to be used instead if a previous release is is the basis for the application development.
In case of an error, values less than zero are returned encodeing the reason why the error occurred.
Errors
- -ODBX_ERR_PARAM
- The result parameter is either NULL or the object is invalid. This is usually the case if result has been already feed to odbx_result_finish().
