package net.ktnx.mobileledger;
+import android.content.res.Resources;
+import android.database.Cursor;
+import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
+import android.util.Log;
+
+import java.io.BufferedReader;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.util.Locale;
class MobileLedgerDB {
static final String DATABASE_NAME = "accounts";
+ static final String OPT_DB_REVISION = "db_revision";
+ static final String ACCOUNTS_TABLE = "accounts";
+ static final String DESCRIPTION_HISTORY_TABLE = "description_history";
private static String db_filename;
static SQLiteDatabase db;
MobileLedgerDB.db_filename = db_filename;
}
- static void initDB() {
+ static void initDB(Resources rm, String pkg_name) {
db = SQLiteDatabase.openOrCreateDatabase(db_filename, null);
+ int cur_ver = Integer.parseInt(get_option_value(OPT_DB_REVISION, "-1"));
+
+ Log.d("db", "Current DB revision is "+String.valueOf(cur_ver));
+
+ while (applyRevision(rm, pkg_name, cur_ver+1)) {
+ cur_ver++;
+ }
+
+ Log.d("db", "Database revision is "+String.valueOf(cur_ver)+" now");
+ }
+ private static boolean applyRevision(Resources rm, String pkg_name, int rev_no) {
+ String rev_file = String.format(Locale.US, "sql_%d", rev_no);
+
+ int res_id = rm.getIdentifier(rev_file, "raw", pkg_name);
+ if (res_id == 0) {
+ Log.d("db", String.format(Locale.US, "No resource for revision %d", rev_no));
+ return false;
+ }
+ db.beginTransaction();
+ try (InputStream res = rm.openRawResource(res_id)) {
+ Log.d("db", "Applying revision " + String.valueOf(rev_no));
+ InputStreamReader isr = new InputStreamReader(res);
+ BufferedReader reader = new BufferedReader(isr);
+
+ String line;
+ while ((line = reader.readLine()) != null) {
+ db.execSQL(line);
+ }
+
+ set_option_value(OPT_DB_REVISION, rev_no);
+ db.setTransactionSuccessful();
+ } catch (Resources.NotFoundException e) {
+ Log.d("db", "SQL revision "+String.valueOf(rev_no)+" not found");
+ return false;
+ }
+ catch (SQLException e) {
+ Log.e("db", String.format(Locale.US, "Error applying revision %d: %s", rev_no, e.getMessage()));
+ return false;
+ }
+ catch (Exception e) {
+ Log.w("db", "Error reading revision" + String.valueOf(rev_no)+": "+e.getMessage());
+ return false;
+ }
+ finally {
+ db.endTransaction();
+ }
+
+ return true;
+ }
+
+ static int get_option_value(String name, int default_value) {
+ String s = get_option_value(name, String.valueOf(default_value));
+ try {
+ return Integer.parseInt(s);
+ }
+ catch (Exception e) {
+ return default_value;
+ }
+ }
+
+ static long get_option_value(String name, long default_value) {
+ String s = get_option_value(name, String.valueOf(default_value));
+ try {
+ return Long.parseLong(s);
+ }
+ catch (Exception e) {
+ Log.d("db", "returning default long value of "+name, e);
+ return default_value;
+ }
+ }
+
+ static String get_option_value(String name, String default_value) {
+ Log.d("db", "about fo fetch option "+name);
+ try (Cursor cursor = db.rawQuery("select value from options where name=?", new String[]{name})) {
+ if (cursor.moveToFirst()) {
+ String result = cursor.getString(0);
+
+ if (result == null ) result = default_value;
+
+ Log.d("db", "option "+name+"="+result);
+ return result;
+ }
+ else return default_value;
+ }
+ catch(Exception e) {
+ Log.d("db", "returning default value for "+name, e);
+ return default_value;
+ }
+ }
+
+ static void set_option_value(String name, String value) {
+ Log.d("db", "setting option "+name+"="+value);
+ db.execSQL("insert or replace into options(name, value) values(?, ?);", new String[]{name, value});
+ }
- db.execSQL("create table if not exists accounts(name varchar);");
- db.execSQL("create index if not exists idx_accounts_name on accounts(name);");
+ static void set_option_value(String name, long value) {
+ set_option_value(name, String.valueOf(value));
}
}