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    1. General Information
    2. MySQL Installation
    3. Tutorial Introduction
    4. Database Administration
    5. MySQL Optimisation
    6. MySQL Language Reference
    7. MySQL Table Types
    8. MySQL APIs
    9. Extending MySQL
    Chapter 8:  MySQL APIs 575 Return Values A MYSQL_ROW structure for the next row.  NULL if there are no more rows to retrieve or if an error occurred. Errors CR_SERVER_LOST The connection to the server was lost during the query. CR_UNKNOWN_ERROR An unknown error occurred. Example MYSQL_ROW row; unsigned int num_fields; unsigned int i; num_fields = mysql_num_fields(result); while ((row = mysql_fetch_row(result))) { unsigned long *lengths; lengths = mysql_fetch_lengths(result); for(i = 0; i < num_fields; i++) { printf("[%.*s] ", (int) lengths[i], row[i] ? row[i] : "NULL"); } printf("\n"); } 8.4.3.20  mysql_field_count() unsigned int mysql_field_count(MYSQL *mysql) If you are using a version of MySQL earlier than Version 3.22.24, you should use unsigned int mysql_num_fields(MYSQL *mysql) instead. Description Returns the number of columns for the most recent query on the connection. The normal use of this function is when mysql_store_result() returned NULL (and thus you have  no result  set  pointer).   In this case,  you can  call  mysql_field_count()  to de- termine whether mysql_store_result() should have produced a non-empty result.  This allows the client program to take proper action without knowing whether the query was a SELECT  (or  SELECT-like) statement.  The example shown here illustrates how this may be done. See Section 8.4.6.1 [NULL mysql_store_result()], page 602.
     

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