]> Query results 3 REDLAND Library Query results RDF query results. typedef librdf_query_results; librdf_stream* librdf_query_results_as_stream (librdf_query_results *query_results); int librdf_query_results_get_count (librdf_query_results *query_results); int librdf_query_results_next (librdf_query_results *query_results); int librdf_query_results_finished (librdf_query_results *query_results); int librdf_query_results_get_bindings (librdf_query_results *query_results, const char ***names, librdf_node **values); librdf_node* librdf_query_results_get_binding_value (librdf_query_results *query_results, int offset); const char* librdf_query_results_get_binding_name (librdf_query_results *query_results, int offset); librdf_node* librdf_query_results_get_binding_value_by_name (librdf_query_results *query_results, const char *name); int librdf_query_results_get_bindings_count (librdf_query_results *query_results); unsigned char* librdf_query_results_to_counted_string (librdf_query_results *query_results, librdf_uri *format_uri, librdf_uri *base_uri, size_t *length_p); unsigned char* librdf_query_results_to_string (librdf_query_results *query_results, librdf_uri *format_uri, librdf_uri *base_uri); int librdf_query_results_to_file_handle (librdf_query_results *query_results, FILE *handle, librdf_uri *format_uri, librdf_uri *base_uri); int librdf_query_results_to_file (librdf_query_results *query_results, const char *name, librdf_uri *format_uri, librdf_uri *base_uri); void librdf_free_query_results (librdf_query_results *query_results); int librdf_query_results_is_bindings (librdf_query_results *query_results); int librdf_query_results_is_boolean (librdf_query_results *query_results); int librdf_query_results_is_graph (librdf_query_results *query_results); int librdf_query_results_get_boolean (librdf_query_results *query_results); The results of an librdf_query execution as a sequence of individual results, an RDF graph as a sequence of triples or a boolean. For variable binding results, the binding names and values can be read in multiple forms and the number of results returned as well as the current result moved to the next. For an RDF graph result, the stream of triples can be returned. For a boolean result, the value can be returned. All results can be turned into a string XML format based on the SPARQL XML results format which can also be written to a file. librdf_query_resultstypedef struct librdf_query_results_s librdf_query_results; Redland query results class. librdf_query_results_as_streamlibrdf_stream* librdf_query_results_as_stream (librdf_query_results *query_results); The return value is only meaningful if this is an RDF graph query result - see librdf_query_results_is_graph query_results : librdf_query_results query_results Returns : RDF graph query result or NULL on error librdf_query_results_get_countint librdf_query_results_get_count (librdf_query_results *query_results); Get number of bindings so far. query_results : librdf_query_results query results Returns : number of bindings found so far librdf_query_results_nextint librdf_query_results_next (librdf_query_results *query_results); Move to the next result. query_results : librdf_query_results query results Returns : non-0 if failed or results exhausted librdf_query_results_finishedint librdf_query_results_finished (librdf_query_results *query_results); Find out if binding results are exhausted. query_results : librdf_query_results query results Returns : non-0 if results are finished or query failed librdf_query_results_get_bindingsint librdf_query_results_get_bindings (librdf_query_results *query_results, const char ***names, librdf_node **values); Get all binding names, values for current result. If names is not NULL, it is set to the address of a shared array of names of the bindings (an output parameter). These names are shared and must not be freed by the caller If values is not NULL, it is used as an array to store pointers to the librdf_node* of the results. These nodes must be freed by the caller. The size of the array is determined by the number of names of bindings, returned by librdf_query_get_bindings_count dynamically or will be known in advanced if hard-coded into the query string. Example const char **names=NULL; librdf_node* values[10]; if(librdf_query_results_get_bindings(results, &names, values)) ... query_results : librdf_query_results query results names : pointer to an array of binding names (or NULL) values : pointer to an array of binding value librdf_node (or NULL) Returns : non-0 if the assignment failed librdf_query_results_get_binding_valuelibrdf_node* librdf_query_results_get_binding_value (librdf_query_results *query_results, int offset); Get one binding value for the current result. query_results : librdf_query_results query results offset : offset of binding name into array of known names Returns : a new librdf_node binding value or NULL on failure librdf_query_results_get_binding_nameconst char* librdf_query_results_get_binding_name (librdf_query_results *query_results, int offset); Get binding name for the current result. query_results : librdf_query_results query results offset : offset of binding name into array of known names Returns : a pointer to a shared copy of the binding name or NULL on failure librdf_query_results_get_binding_value_by_namelibrdf_node* librdf_query_results_get_binding_value_by_name (librdf_query_results *query_results, const char *name); Get one binding value for a given name in the current result. query_results : librdf_query_results query results name : variable name Returns : a new librdf_node binding value or NULL on failure librdf_query_results_get_bindings_countint librdf_query_results_get_bindings_count (librdf_query_results *query_results); Get the number of bound variables in the result. query_results : librdf_query_results query results Returns : <0 if failed or results exhausted librdf_query_results_to_counted_stringunsigned char* librdf_query_results_to_counted_string (librdf_query_results *query_results, librdf_uri *format_uri, librdf_uri *base_uri, size_t *length_p); Turn a query results into a string. Values of format_uri currently supported (via Rasqal) are: http://www.w3.org/TR/2004/WD-rdf-sparql-XMLres-20041221/ The base URI may be used for the generated syntax, depending on the format. The returned string must be freed by the caller query_results : librdf_query_results object format_uri : URI of syntax to format to base_uri : Base URI of output formatted syntax or NULL length_p : Pointer to where to store length of string or NULL Returns : new string value or NULL on failure librdf_query_results_to_stringunsigned char* librdf_query_results_to_string (librdf_query_results *query_results, librdf_uri *format_uri, librdf_uri *base_uri); Turn a query results into a string. See librdf_query_results_to_counted_string for information on the format_uri and base_uri parameters. The returned string must be freed by the caller query_results : librdf_query_results object format_uri : URI of syntax to format to base_uri : Base URI of output formatted syntax Returns : new string value or NULL on failure librdf_query_results_to_file_handleint librdf_query_results_to_file_handle (librdf_query_results *query_results, FILE *handle, librdf_uri *format_uri, librdf_uri *base_uri); Write a query results to a FILE*. See librdf_query_results_to_counted_string for information on the format_uri and base_uri parameters. query_results : librdf_query_results object handle : file handle to write to format_uri : URI of syntax to format to base_uri : Base URI of output formatted syntax Returns : non 0 on failure librdf_query_results_to_fileint librdf_query_results_to_file (librdf_query_results *query_results, const char *name, librdf_uri *format_uri, librdf_uri *base_uri); Write a query results to a file. See librdf_query_results_to_counted_string for information on the format_uri and base_uri parameters. query_results : librdf_query_results object name : filename to write to format_uri : URI of syntax to format to base_uri : Base URI of output formatted syntax Returns : non 0 on failure librdf_free_query_resultsvoid librdf_free_query_results (librdf_query_results *query_results); Destructor - destroy a librdf_query_results object. query_results : librdf_query_results object librdf_query_results_is_bindingsint librdf_query_results_is_bindings (librdf_query_results *query_results); Test if librdf_query_results is variable bindings format. query_results : librdf_query_results object Returns : non-0 if true librdf_query_results_is_booleanint librdf_query_results_is_boolean (librdf_query_results *query_results); Test if librdf_query_results is boolean format. query_results : librdf_query_results object Returns : non-0 if true librdf_query_results_is_graphint librdf_query_results_is_graph (librdf_query_results *query_results); Test if librdf_query_results is RDF graph format. query_results : librdf_query_results object Returns : non-0 if true librdf_query_results_get_booleanint librdf_query_results_get_boolean (librdf_query_results *query_results); Get boolean query result. The return value is only meaningful if this is a boolean query result - see librdf_query_results_is_boolean query_results : librdf_query_results query_results Returns : boolean query result - >0 is true, 0 is false, <0 on error or finished