org.tentackle.sql.backends.AbstractSql2008Backend Maven / Gradle / Ivy
The newest version!
/*
* Tentackle - https://tentackle.org.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
package org.tentackle.sql.backends;
/**
* Common to all SQL2008 backends.
*
* @author harald
*/
public abstract class AbstractSql2008Backend extends AbstractSql2003Backend {
/** OFFSET string. */
public static final String SQL_OFFSET = " OFFSET ? ROWS";
/** FETCH FIRST string. */
public static final String SQL_FETCH_FIRST = " FETCH FIRST ? ROWS ONLY";
/**
* Parent constructor.
*/
public AbstractSql2008Backend() {
// see -Xlint:missing-explicit-ctor since Java 16
}
@Override
public void buildSelectSql(StringBuilder sqlBuilder, boolean writeLock, int limit, int offset) {
if (isLeadingSelectMissing(sqlBuilder)) {
sqlBuilder.insert(0, SQL_SELECT);
}
if (writeLock) {
sqlBuilder.append(SQL_FOR_UPDATE);
}
if (offset > 0) {
sqlBuilder.append(SQL_OFFSET);
}
if (limit > 0) {
sqlBuilder.append(SQL_FETCH_FIRST);
}
}
}