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TrackerSparqlStatement

TrackerSparqlStatement — Prepared statements

Stability Level

Stable, unless otherwise indicated

Functions

Properties

TrackerSparqlConnection * connection Read / Write / Construct Only
gchar * sparql Read / Write / Construct Only

Types and Values

Object Hierarchy

    GObject
    ╰── TrackerSparqlStatement

Includes

#include <tracker-sparql.h>

Description

The TrackerSparqlStatement object represents a SPARQL query. This query may contain parameterized variables (expressed as ~var in the syntax), which may be mapped to arbitrary values prior to execution. This statement may be reused for future queries with different values.

The argument bindings may be changed through tracker_sparql_statement_bind_int(), tracker_sparql_statement_bind_boolean(), tracker_sparql_statement_bind_double() and tracker_sparql_statement_bind_string(). Those functions receive a name argument corresponding for the variable name in the SPARQL query (eg. "var" for ~var) and a value to map the variable to.

Once all arguments have a value, the query may be executed through tracker_sparql_statement_execute() or tracker_sparql_statement_execute_async().

This object was added in Tracker 2.2.

Functions

tracker_sparql_statement_execute ()

TrackerSparqlCursor *
tracker_sparql_statement_execute (TrackerSparqlStatement *stmt,
                                  GCancellable *cancellable,
                                  GError **error);

Executes the SPARQL query with the currently bound values.

Parameters

stmt

a TrackerSparqlStatement

 

cancellable

a GCancellable used to cancel the operation

 

error

GError for error reporting.

 

Returns

A TrackerSparqlCursor.

[transfer full]


tracker_sparql_statement_execute_async ()

void
tracker_sparql_statement_execute_async
                               (TrackerSparqlStatement *stmt,
                                GCancellable *cancellable,
                                GAsyncReadyCallback callback,
                                gpointer user_data);

Asynchronously executes the SPARQL query with the currently bound values.

Parameters

stmt

a TrackerSparqlStatement

 

cancellable

a GCancellable used to cancel the operation

 

callback

user-defined GAsyncReadyCallback to be called when asynchronous operation is finished.

 

user_data

user-defined data to be passed to callback

 

tracker_sparql_statement_execute_finish ()

TrackerSparqlCursor *
tracker_sparql_statement_execute_finish
                               (TrackerSparqlStatement *stmt,
                                GAsyncResult *res,
                                GError **error);

Finishes the asynchronous operation started through tracker_sparql_statement_execute_async().

Parameters

stmt

a TrackerSparqlStatement

 

res

The GAsyncResult from the callback used to return the TrackerSparqlCursor

 

error

The error which occurred or NULL

 

Returns

A TrackerSparqlCursor.

[transfer full]


tracker_sparql_statement_bind_int ()

void
tracker_sparql_statement_bind_int (TrackerSparqlStatement *stmt,
                                   const gchar *name,
                                   gint64 value);

Binds the integer value to variable name .

Parameters

stmt

a TrackerSparqlStatement

 

name

variable name

 

value

value

 

tracker_sparql_statement_bind_double ()

void
tracker_sparql_statement_bind_double (TrackerSparqlStatement *stmt,
                                      const gchar *name,
                                      gdouble value);

Binds the double value to variable name .

Parameters

stmt

a TrackerSparqlStatement

 

name

variable name

 

value

value

 

tracker_sparql_statement_bind_string ()

void
tracker_sparql_statement_bind_string (TrackerSparqlStatement *stmt,
                                      const gchar *name,
                                      const gchar *value);

Binds the string value to variable name .

Parameters

stmt

a TrackerSparqlStatement

 

name

variable name

 

value

value

 

tracker_sparql_statement_bind_boolean ()

void
tracker_sparql_statement_bind_boolean (TrackerSparqlStatement *stmt,
                                       const gchar *name,
                                       gboolean value);

Binds the boolean value to variable name .

Parameters

stmt

a TrackerSparqlStatement

 

name

variable name

 

value

value

 

tracker_sparql_statement_clear_bindings ()

void
tracker_sparql_statement_clear_bindings
                               (TrackerSparqlStatement *stmt);

Clears all boolean/string/integer/double bindings.

Parameters

Since: 3.0


tracker_sparql_statement_get_connection ()

TrackerSparqlConnection *
tracker_sparql_statement_get_connection
                               (TrackerSparqlStatement *stmt);

Returns the TrackerSparqlConnection that this statement was created from.

Parameters

Returns

The SPARQL connection of this statement.

[transfer none]


tracker_sparql_statement_get_sparql ()

const gchar *
tracker_sparql_statement_get_sparql (TrackerSparqlStatement *stmt);

Returns the SPARQL string that this prepared statement holds.

Parameters

Returns

The contained SPARQL query

Types and Values

TrackerSparqlStatement

typedef struct _TrackerSparqlStatement TrackerSparqlStatement;

The TrackerSparqlStatement object represents a prepared query statement.

Property Details

The “connection” property

  “connection”               TrackerSparqlConnection *

The TrackerSparqlConnection used to perform the query.

Owner: TrackerSparqlStatement

Flags: Read / Write / Construct Only


The “sparql” property

  “sparql”                   gchar *

SPARQL query stored in this statement.

Owner: TrackerSparqlStatement

Flags: Read / Write / Construct Only

Default value: NULL