2 * Copyright (C) 2015 Roland Haeder
4 * This program is free software: you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation, either version 3 of the License, or
7 * (at your option) any later version.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program. If not, see <http://www.gnu.org/licenses/>.
17 package org.mxchange.addressbook.database.backend;
19 import java.io.IOException;
20 import java.sql.SQLException;
21 import java.util.Iterator;
22 import org.mxchange.addressbook.FrameworkInterface;
23 import org.mxchange.addressbook.database.storage.Storeable;
24 import org.mxchange.addressbook.exceptions.BadTokenException;
27 * A generic interface for database frontends
29 * @author Roland Haeder
31 public interface DatabaseBackend extends FrameworkInterface {
34 * Tries a connection to the database
36 * @throws java.sql.SQLException If the connection attempt fails
38 public void connectToDatabase () throws SQLException;
41 * Shuts down this backend
43 public void doShutdown ();
46 * Some "getter" for total table row count
48 * @return Total row count
49 * @throws java.sql.SQLException If an SQL error occurs
51 public int getTotalCount () throws SQLException;
54 * Checks whether at least one row is found with given boolean value.
56 * @param columnName Column to check for boolean value
57 * @param bool Boolean value to check
58 * @return Whether boolean value is found and returns at least one row
59 * @throws java.sql.SQLException If an SQL error occurs
61 public boolean isRowFound (final String columnName, final boolean bool) throws SQLException;
66 public void rewind ();
69 * Get length of underlaying file
71 * @return Length of underlaying file
73 public long length ();
76 * Stores an object in the database.
78 * @param object Object to store in database
79 * @throws java.io.IOException From inner class
81 public void store (final Storeable object) throws IOException;
84 * Gets an iterator for contacts
86 * @return Iterator for contacts
87 * @throws org.mxchange.addressbook.exceptions.BadTokenException If the CSV token is badly formulated
89 public Iterator<? extends Storeable> iterator () throws BadTokenException;
92 * Reads a single row from database.
94 * @param rowIndex Row index (or how much to skip)
95 * @return A Storeable instance
97 public Storeable readRow (final int rowIndex);