hardcoresushi/DroidFS
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Fix database upgrade

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This commit is contained in:
Matéo Duparc 2023-09-17 19:11:52 +02:00
parent ac71ad887d
commit f1a9c1383c
Signed by: hardcoresushi
GPG Key ID: AFE384344A45E13A
1 changed files with 13 additions and 11 deletions
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24
app/src/main/java/sushi/hardcore/droidfs/VolumeDatabase.kt
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@ -95,21 +95,23 @@ class VolumeDatabase(private val context: Context): SQLiteOpenHelper(context, Co
}
}
if (oldVersion < 6) {
val volumeCount = db.rawQuery("SELECT COUNT(*) FROM $TABLE_NAME", null).let { cursor ->
cursor.moveToNext()
cursor.getInt(0).also {
val cursor = db.rawQuery("SELECT $COLUMN_NAME FROM $TABLE_NAME;", null)
val volumeNames = arrayOfNulls<String>(cursor.count)
var i = 0
while (cursor.moveToNext()) {
volumeNames[i++] = cursor.getString(0)
}
cursor.close()
}
}
db.execSQL("ALTER TABLE $TABLE_NAME RENAME TO OLD;")
createTable(db)
val uuids = (0 until volumeCount).joinToString(", ") { "('${VolumeData.newUuid()}')" }
val baseColumns = "$COLUMN_NAME, $COLUMN_HIDDEN, $COLUMN_TYPE, $COLUMN_HASH, $COLUMN_IV"
val uuidsValues = volumeNames.indices.joinToString(", ") { "('${VolumeData.newUuid()}', ?)" }
// add uuids to old data
db.execSQL("INSERT INTO $TABLE_NAME " +
"SELECT uuid, $baseColumns FROM " +
"(SELECT $baseColumns, ROW_NUMBER() OVER () i FROM OLD) NATURAL JOIN " +
"(SELECT column1 uuid, ROW_NUMBER() OVER () i FROM (VALUES $uuids));")
db.execSQL(
"INSERT INTO $TABLE_NAME " +
"WITH uuids($COLUMN_UUID, $COLUMN_NAME) AS (VALUES $uuidsValues) " +
"SELECT * FROM OLD NATURAL JOIN uuids;",
volumeNames
)
db.execSQL("DROP TABLE OLD;")
}
}