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/*
This file is part of Subsonic.
Subsonic is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Subsonic is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with Subsonic. If not, see <http://www.gnu.org/licenses/>.
Copyright 2009 (C) Sindre Mehus
*/
package net.sourceforge.subsonic.dao;
import java.util.Date;
import java.util.List;
import org.springframework.jdbc.core.*;
import net.sourceforge.subsonic.Logger;
/**
* Abstract superclass for all DAO's.
*
* @author Sindre Mehus
*/
public class AbstractDao {
private static final Logger LOG = Logger.getLogger(AbstractDao.class);
private DaoHelper daoHelper;
/**
* Returns a JDBC template for performing database operations.
* @return A JDBC template.
*/
public JdbcTemplate getJdbcTemplate() {
return daoHelper.getJdbcTemplate();
}
protected String questionMarks(String columns) {
int count = columns.split(", ").length;
StringBuilder builder = new StringBuilder();
for (int i = 0; i < count; i++) {
builder.append('?');
if (i < count - 1) {
builder.append(", ");
}
}
return builder.toString();
}
protected String prefix(String columns, String prefix) {
StringBuilder builder = new StringBuilder();
for (String s : columns.split(", ")) {
builder.append(prefix).append(".").append(s).append(",");
}
if (builder.length() > 0) {
builder.setLength(builder.length() - 1);
}
return builder.toString();
}
protected int update(String sql, Object... args) {
long t = System.nanoTime();
int result = getJdbcTemplate().update(sql, args);
log(sql, t);
return result;
}
private void log(String sql, long startTimeNano) {
// long micros = (System.nanoTime() - startTimeNano) / 1000L;
// LOG.debug(micros + " " + sql);
}
protected <T> List<T> query(String sql, RowMapper rowMapper, Object... args) {
long t = System.nanoTime();
List<T> result = getJdbcTemplate().query(sql, args, rowMapper);
log(sql, t);
return result;
}
protected List<String> queryForStrings(String sql, Object... args) {
long t = System.nanoTime();
List<String> result = getJdbcTemplate().queryForList(sql, args, String.class);
log(sql, t);
return result;
}
protected Integer queryForInt(String sql, Integer defaultValue, Object... args) {
long t = System.nanoTime();
List<Integer> list = getJdbcTemplate().queryForList(sql, args, Integer.class);
Integer result = list.isEmpty() ? defaultValue : list.get(0) == null ? defaultValue : list.get(0);
log(sql, t);
return result;
}
protected Date queryForDate(String sql, Date defaultValue, Object... args) {
long t = System.nanoTime();
List<Date> list = getJdbcTemplate().queryForList(sql, args, Date.class);
Date result = list.isEmpty() ? defaultValue : list.get(0) == null ? defaultValue : list.get(0);
log(sql, t);
return result;
}
protected Long queryForLong(String sql, Long defaultValue, Object... args) {
long t = System.nanoTime();
List<Long> list = getJdbcTemplate().queryForList(sql, args, Long.class);
Long result = list.isEmpty() ? defaultValue : list.get(0) == null ? defaultValue : list.get(0);
log(sql, t);
return result;
}
protected <T> T queryOne(String sql, RowMapper rowMapper, Object... args) {
List<T> list = query(sql, rowMapper, args);
return list.isEmpty() ? null : list.get(0);
}
public void setDaoHelper(DaoHelper daoHelper) {
this.daoHelper = daoHelper;
}
}
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