85 lines
2.7 KiB
Java
85 lines
2.7 KiB
Java
/*
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* Copyright (C) 2017 Schürmann & Breitmoser GbR
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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package sushi.hardcore.droidfs.util;
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import androidx.sqlite.db.SupportSQLiteDatabase;
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import android.database.Cursor;
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import android.text.TextUtils;
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/**
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* Borrowed from OpenKeyChain
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*/
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/**
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* Shamelessly copied from android.database.DatabaseUtils
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*/
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public class DatabaseUtil {
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/**
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* Concatenates two SQL WHERE clauses, handling empty or null values.
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*/
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public static String concatenateWhere(String a, String b) {
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if (TextUtils.isEmpty(a)) {
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return b;
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}
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if (TextUtils.isEmpty(b)) {
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return a;
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}
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return "(" + a + ") AND (" + b + ")";
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}
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/**
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* Appends one set of selection args to another. This is useful when adding a selection
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* argument to a user provided set.
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*/
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public static String[] appendSelectionArgs(String[] originalValues, String[] newValues) {
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if (originalValues == null || originalValues.length == 0) {
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return newValues;
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}
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String[] result = new String[originalValues.length + newValues.length ];
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System.arraycopy(originalValues, 0, result, 0, originalValues.length);
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System.arraycopy(newValues, 0, result, originalValues.length, newValues.length);
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return result;
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}
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public static void explainQuery(SupportSQLiteDatabase db, String sql) {
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Cursor explainCursor = db.query("EXPLAIN QUERY PLAN " + sql, new String[0]);
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// this is a debugging feature, we can be a little careless
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explainCursor.moveToFirst();
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StringBuilder line = new StringBuilder();
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for (int i = 0; i < explainCursor.getColumnCount(); i++) {
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line.append(explainCursor.getColumnName(i)).append(", ");
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}
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while (!explainCursor.isAfterLast()) {
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line = new StringBuilder();
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for (int i = 0; i < explainCursor.getColumnCount(); i++) {
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line.append(explainCursor.getString(i)).append(", ");
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}
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explainCursor.moveToNext();
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}
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explainCursor.close();
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}
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}
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