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package net.sourceforge.subsonic.backend.dao;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.core.RowMapper;
import java.util.List;
/**
* Abstract superclass for all DAO's.
*
* @author Sindre Mehus
*/
public class AbstractDao {
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;
StringBuffer buf = new StringBuffer();
for (int i = 0; i < count; i++) {
buf.append('?');
if (i < count - 1) {
buf.append(", ");
}
}
return buf.toString();
}
protected int update(String sql, Object... args) {
return getJdbcTemplate().update(sql, args);
}
protected <T> List<T> query(String sql, RowMapper rowMapper, Object... args) {
return getJdbcTemplate().query(sql, args, rowMapper);
}
protected <T> T queryOne(String sql, RowMapper rowMapper, Object... args) {
List<T> result = query(sql, rowMapper, args);
return result.isEmpty() ? null : result.get(0);
}
protected Integer queryForInt(String sql, Integer defaultValue, Object... args) {
List<Integer> result = getJdbcTemplate().queryForList(sql, args, Integer.class);
return result.isEmpty() ? defaultValue : result.get(0) == null ? defaultValue : result.get(0);
}
public void setDaoHelper(DaoHelper daoHelper) {
this.daoHelper = daoHelper;
}
}
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