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Bug 741590 - Database migration to combine history entries with the same URL. r=rnewman

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This commit is contained in:
Margaret Leibovic 2012-04-09 17:28:59 -07:00
parent 22e6264f5b
commit 925676b3e1
1 changed files with 38 additions and 1 deletions
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39
mobile/android/base/db/BrowserProvider.java.in
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@ -66,7 +66,7 @@ public class BrowserProvider extends ContentProvider {
static final String DATABASE_NAME = "browser.db";
static final int DATABASE_VERSION = 7;
static final int DATABASE_VERSION = 8;
// Maximum age of deleted records to be cleaned up (20 days in ms)
static final long MAX_AGE_OF_DELETED_RECORDS = 86400000 * 20;
@ -810,6 +810,40 @@ public class BrowserProvider extends ContentProvider {
migrateImagesTable(db);
}
private void upgradeDatabaseFrom7to8(SQLiteDatabase db) {
debug("Combining history entries with the same URL");
final String TABLE_DUPES = "duped_urls";
final String TOTAL = "total";
final String LATEST = "latest";
final String WINNER = "winner";
db.execSQL("CREATE TEMP TABLE " + TABLE_DUPES + " AS" +
" SELECT " + History.URL + ", " +
"SUM(" + History.VISITS + ") AS " + TOTAL + ", " +
"MAX(" + History.DATE_MODIFIED + ") AS " + LATEST + ", " +
"MAX(" + History._ID + ") AS " + WINNER +
" FROM " + TABLE_HISTORY +
" GROUP BY " + History.URL +
" HAVING count(" + History.URL + ") > 1");
db.execSQL("CREATE UNIQUE INDEX " + TABLE_DUPES + "_url_index ON " +
TABLE_DUPES + " (" + History.URL + ")");
final String fromClause = " FROM " + TABLE_DUPES + " WHERE " +
qualifyColumn(TABLE_DUPES, History.URL) + " = " +
qualifyColumn(TABLE_HISTORY, History.URL);
db.execSQL("UPDATE " + TABLE_HISTORY +
" SET " + History.VISITS + " = (SELECT " + TOTAL + fromClause + "), " +
History.DATE_MODIFIED + " = (SELECT " + LATEST + fromClause + "), " +
History.IS_DELETED + " = " +
"(" + History._ID + " <> (SELECT " + WINNER + fromClause + "))" +
" WHERE " + History.URL + " IN (SELECT " + History.URL + " FROM " + TABLE_DUPES + ")");
db.execSQL("DROP TABLE " + TABLE_DUPES);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
debug("Upgrading browser.db: " + db.getPath() + " from " +
@ -844,6 +878,9 @@ public class BrowserProvider extends ContentProvider {
case 7:
upgradeDatabaseFrom6to7(db);
break;
case 8:
upgradeDatabaseFrom7to8(db);
}
}