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/* sql.vala
*
* Copyright © 2011 Collabora Ltd.
* By Siegfried-Angel Gevatter Pujals <siegfried@gevatter.com>
* By Seif Lotfy <seif@lotfy.com>
* Copyright © 2011 Manish Sinha <manishsinha@ubuntu.com>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 2.1 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
using Zeitgeist;
namespace Zeitgeist.SQLite
{
public enum EventViewRows
{
ID,
TIMESTAMP,
INTERPRETATION,
MANIFESTATION,
ACTOR,
PAYLOAD,
SUBJECT_URI,
SUBJECT_ID,
SUBJECT_INTERPRETATION,
SUBJECT_MANIFESTATION,
SUBJECT_ORIGIN,
SUBJECT_ORIGIN_URI,
SUBJECT_MIMETYPE,
SUBJECT_TEXT,
SUBJECT_STORAGE,
SUBJECT_STORAGE_STATE,
ORIGIN,
EVENT_ORIGIN_URI,
SUBJECT_CURRENT_URI,
SUBJECT_ID_CURRENT
}
public delegate void DeletionCallback (string table, int64 rowid);
public class ZeitgeistDatabase : Object
{
public Sqlite.Statement event_insertion_stmt;
public Sqlite.Statement id_retrieval_stmt;
public Sqlite.Statement move_handling_stmt;
public Sqlite.Statement payload_insertion_stmt;
// The DB should be accessible from engine for statement preperations
// as well as allowing extensions to add tables to it.
public Sqlite.Database database;
private DeletionCallback? deletion_callback = null;
public ZeitgeistDatabase () throws EngineError
{
int rc = Sqlite.Database.open_v2 (
Utils.get_database_file_path (),
out database);
assert_query_success (rc, "Can't open database");
DatabaseSchema.ensure_schema (database);
prepare_queries ();
// Register a data change notification callback to look for
// deletions, so we can keep the TableLookups up to date.
database.update_hook (update_callback);
}
public uint32 get_last_id () throws EngineError
{
int last_id = -1;
int rc = database.exec ("SELECT MAX(id) FROM event",
(n_columns, values, column_names) =>
{
if (values[0] == null)
last_id = 0;
else
last_id = int.parse (values[0]);
return 0;
}, null);
assert_query_success (rc, "Can't query database");
assert (last_id != -1);
return last_id;
}
public void set_deletion_callback (DeletionCallback? callback)
{
deletion_callback = callback;
}
/**
* Join all given event_ids into a comma-separated string suitable
* for use in a SQL query like "WHERE id IN (...)".
*/
public string get_sql_string_from_event_ids (uint32[] event_ids)
requires (event_ids.length > 0)
{
var sql_condition = new StringBuilder ();
sql_condition.append_printf ("%u", event_ids[0]);
for (int i = 1; i < event_ids.length; ++i) {
sql_condition.append_printf (", %u", event_ids[i]);
}
return sql_condition.str;
}
public TimeRange? get_time_range_for_event_ids (uint32[] event_ids)
throws EngineError
{
if (event_ids.length == 0)
return null;
string sql = """
SELECT MIN(timestamp), MAX(timestamp)
FROM event
WHERE id IN (%s)
""".printf (get_sql_string_from_event_ids (event_ids));
TimeRange? time_range = null;
int rc = database.exec (sql,
(n_columns, values, column_names) =>
{
if (values[0] != null)
{
int64 start = int64.parse (values[0]);
int64 end = int64.parse (values[1]);
time_range = new TimeRange (start, end);
}
return 0;
}, null);
assert_query_success (rc, "SQL Error");
return time_range;
}
public void insert_or_ignore_into_table (string table_name,
GenericArray<string> values) throws EngineError
{
int rc;
assert (values.length > 0);
var sql = new StringBuilder ();
sql.append ("INSERT OR IGNORE INTO ");
sql.append (table_name);
sql.append (" (value) SELECT ?");
for (int i = 1; i < values.length; ++i)
sql.append (" UNION SELECT ?");
Sqlite.Statement stmt;
rc = database.prepare_v2 (sql.str, -1, out stmt);
assert_query_success (rc, "SQL error");
for (int i = 0; i < values.length; ++i)
stmt.bind_text (i+1, values[i]);
rc = stmt.step ();
assert_query_success (rc, "SQL error", Sqlite.DONE);
}
public void begin_transaction () throws EngineError
{
int rc = database.exec ("BEGIN");
assert_query_success (rc, "Can't start transaction");
}
public void end_transaction () throws EngineError
{
int rc = database.exec ("COMMIT");
assert_query_success (rc, "Can't commit transaction");
}
public void close ()
{
// SQLite connection is implicitly closed upon destruction
database = null;
}
/**
* Ensure `rc' is SQLITE_OK. If it isn't, print an error message
* and throw an error.
*
* @param rc error code returned by a SQLite call
* @param msg message to print if `rc' indicates an error
* @throws EngineError
*/
public void assert_query_success (int rc, string msg,
int success_code=Sqlite.OK) throws EngineError
{
if (rc != success_code)
{
string error_message = "%s: %d, %s".printf(
msg, rc, database.errmsg ());
warning ("%s\n", error_message);
throw new EngineError.DATABASE_ERROR (error_message);
}
}
private void prepare_queries () throws EngineError
{
int rc;
string sql;
// Event insertion statement
sql = """
INSERT INTO event (
id, timestamp, interpretation, manifestation, actor,
origin, payload, subj_id, subj_id_current,
subj_interpretation, subj_manifestation, subj_origin,
subj_mimetype, subj_text, subj_storage
) VALUES (
?, ?, ?, ?, ?,
(SELECT id FROM uri WHERE value=?),
?,
(SELECT id FROM uri WHERE value=?),
(SELECT id FROM uri WHERE value=?),
?, ?,
(SELECT id FROM uri WHERE value=?),
?,
(SELECT id FROM text WHERE value=?),
(SELECT id FROM storage WHERE value=?)
)""";
rc = database.prepare_v2 (sql, -1, out event_insertion_stmt);
assert_query_success (rc, "Insertion query error");
// Event ID retrieval statement
sql = """
SELECT id FROM event
WHERE timestamp=? AND interpretation=? AND
manifestation=? AND actor=?
""";
rc = database.prepare_v2 (sql, -1, out id_retrieval_stmt);
assert_query_success (rc, "Event ID retrieval query error");
// Move handling statment
sql = """
UPDATE event
SET subj_id_current=(SELECT id FROM uri WHERE value=?)
WHERE subj_id_current=(SELECT id FROM uri WHERE value=?)
AND interpretation!=? AND timestamp<?
""";
rc = database.prepare_v2 (sql, -1, out move_handling_stmt);
assert_query_success (rc, "Move handling error");
// Payload insertion statment
sql = """
INSERT INTO payload (value) VALUES (?)
""";
rc = database.prepare_v2 (sql, -1, out payload_insertion_stmt);
assert_query_success (rc, "Payload insertion query error");
}
protected void update_callback (Sqlite.Action action,
string dbname, string table, int64 rowid)
{
if (action != Sqlite.Action.DELETE)
return;
if (deletion_callback != null)
deletion_callback (table, rowid);
//interpretations_table
// manifestations_
//mimetypes_table - mimetype table
// actors_ . actor table
// FIXME!
/*
stdout.printf ("%s", dbname); // = main
stdout.printf ("%s", table);
stdout.printf ("%li", (long) rowid);
*/
}
}
}
// vim:expandtab:ts=4:sw=4
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