mysql_store_result() - mysql/mysql.h

 After invoking mysql_query() or
        mysql_real_query(), you must
        call mysql_store_result() or
        mysql_use_result() for every
        statement that successfully produces a result set
        (SELECT,
        SHOW,
        DESCRIBE,
        EXPLAIN,
        CHECK TABLE, and so forth). You
        must also call
        mysql_free_result() after you
        are done with the result set.mysql_query()mysql_query()mysql_real_query()mysql_real_query()mysql_store_result()mysql_store_result()mysql_use_result()mysql_use_result()SELECTSELECTSHOWSHOWDESCRIBEDESCRIBEEXPLAINEXPLAINCHECK TABLECHECK TABLEmysql_free_result()mysql_free_result()You need not call
        mysql_store_result() or
        mysql_use_result() for other
        statements, but it does not do any harm or cause any notable
        performance degradation if you call
        mysql_store_result() in all
        cases. You can detect whether the statement has a result set by
        checking whether
        mysql_store_result() returns a
        nonzero value (more about this later).mysql_store_result()mysql_store_result()mysql_use_result()mysql_use_result()mysql_store_result()mysql_store_result()mysql_store_result()mysql_store_result()If you enable multiple-statement support, you should retrieve
        results from calls to
        mysql_query() or
        mysql_real_query() by using a
        loop that calls
        mysql_next_result() to determine
        whether there are more results. For an example, see
        Section 25.8.17, “C API Support for Multiple Statement Execution”.mysql_query()mysql_query()mysql_real_query()mysql_real_query()mysql_next_result()mysql_next_result()Section 25.8.17, “C API Support for Multiple Statement Execution”If you want to know whether a statement should return a result
        set, you can use
        mysql_field_count() to check for
        this. See Section 25.8.7.22, “mysql_field_count()”.mysql_field_count()mysql_field_count()Section 25.8.7.22, “mysql_field_count()”mysql_store_result() reads the
        entire result of a query to the client, allocates a
        MYSQL_RES structure, and places the result
        into this structure.mysql_store_result()mysql_store_result()MYSQL_RESmysql_store_result() returns a
        null pointer if the statement did not return a result set (for
        example, if it was an INSERT
        statement).mysql_store_result()mysql_store_result()INSERTINSERTmysql_store_result() also
        returns a null pointer if reading of the result set failed. You
        can check whether an error occurred by checking whether
        mysql_error() returns a nonempty
        string, mysql_errno() returns
        nonzero, or mysql_field_count()
        returns zero.mysql_store_result()mysql_store_result()mysql_error()mysql_error()mysql_errno()mysql_errno()mysql_field_count()mysql_field_count()An empty result set is returned if there are no rows returned.
        (An empty result set differs from a null pointer as a return
        value.)After you have called
        mysql_store_result() and gotten
        back a result that is not a null pointer, you can call
        mysql_num_rows() to find out how
        many rows are in the result set.mysql_store_result()mysql_store_result()mysql_num_rows()mysql_num_rows()You can call mysql_fetch_row()
        to fetch rows from the result set, or
        mysql_row_seek() and
        mysql_row_tell() to obtain or
        set the current row position within the result set.mysql_fetch_row()mysql_fetch_row()mysql_row_seek()mysql_row_seek()mysql_row_tell()mysql_row_tell()See Section 25.8.15.1, “Why mysql_store_result() Sometimes Returns NULL After mysql_query()
        Returns Success”.Section 25.8.15.1, “Why mysql_store_result() Sometimes Returns NULL After mysql_query()
        Returns Success”

Syntax

MYSQL_RES *mysql_store_result(MYSQL *mysql)

Example

Output / Return Value

 A MYSQL_RES result structure with the
        results. NULL (0) if an error occurred.MYSQL_RESNULL

Limitations

Alternatives / See Also

Reference