(mysql.info) mysql-fetch-field

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 22.2.3.17 `mysql_fetch_field()'
 ...............................
 
 `MYSQL_FIELD *mysql_fetch_field(MYSQL_RES *result)'
 
 *Description*
 
 Returns the definition of one column of a result set as a `MYSQL_FIELD'
 structure. Call this function repeatedly to retrieve information about
 all columns in the result set. `mysql_fetch_field()' returns `NULL'
 when no more fields are left.
 
 `mysql_fetch_field()' is reset to return information about the first
 field each time you execute a new `SELECT' query. The field returned by
 `mysql_fetch_field()' is also affected by calls to `mysql_field_seek()'.
 
 If you've called `mysql_query()' to perform a `SELECT' on a table but
 have not called `mysql_store_result()', MySQL returns the default blob
 length (8KB) if you call `mysql_fetch_field()' to ask for the length of
 a `BLOB' field. (The 8KB size is chosen because MySQL doesn't know the
 maximum length for the `BLOB'. This should be made configurable
 sometime.) Once you've retrieved the result set, `field->max_length'
 contains the length of the largest value for this column in the
 specific query.
 
 *Return Values*
 
 The `MYSQL_FIELD' structure for the current column. `NULL' if no
 columns are left.
 
 *Errors*
 
 None.
 
 *Example*
 
      MYSQL_FIELD *field;
 
      while((field = mysql_fetch_field(result)))
      {
          printf("field name %s\n", field->name);
      }
 

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