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C API Prepared Statement Function Descriptions
2217
Errors
•
CR_COMMANDS_OUT_OF_SYNC
[2942]
Commands were executed in an improper order.
•
CR_SERVER_GONE_ERROR
[2942]
The MySQL server has gone away.
•
CR_SERVER_LOST
[2942]
The connection to the server was lost during the query
•
CR_UNKNOWN_ERROR
[2941]
An unknown error occurred.
20.6.10.22.
mysql_stmt_result_metadata()
MYSQL_RES *mysql_stmt_result_metadata(MYSQL_STMT *stmt)
Description
If a statement passed to
mysql_stmt_prepare()
is one that produces a result set,
mysql_stmt_result_metadata()
returns the result set metadata in the form of a pointer to a
MYSQL_RES
structure that can be used to process the meta information such as number of fields and
individual field information. This result set pointer can be passed as an argument to any of the field-
based API functions that process result set metadata, such as:
•
mysql_num_fields()
•
mysql_fetch_field()
•
mysql_fetch_field_direct()
•
mysql_fetch_fields()
•
mysql_field_count()
•
mysql_field_seek()
•
mysql_field_tell()
•
mysql_free_result()
The result set structure should be freed when you are done with it, which you can do by passing it
to
mysql_free_result()
. This is similar to the way you free a result set obtained from a call to
mysql_store_result()
.
The result set returned by
mysql_stmt_result_metadata()
contains only metadata. It
does not contain any row results. The rows are obtained by using the statement handle with
mysql_stmt_fetch()
.
Return Values
A
MYSQL_RES
result structure.
NULL
if no meta information exists for the prepared query.
Errors
•
CR_OUT_OF_MEMORY
[2942]
Out of memory.
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