com.jn.sqlhelper.dialect.internal.MaxDBDialect Maven / Gradle / Ivy
/*
* Copyright 2019 the original author or authors.
*
* Licensed under the LGPL, Version 3.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at http://www.gnu.org/licenses/lgpl-3.0.html
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.jn.sqlhelper.dialect.internal;
import com.jn.langx.annotation.Name;
import com.jn.sqlhelper.dialect.pagination.RowSelection;
import com.jn.sqlhelper.dialect.internal.limit.AbstractLimitHandler;
import com.jn.sqlhelper.dialect.internal.limit.LimitHelper;
@Name("maxdb")
public class MaxDBDialect extends AbstractDialect {
public MaxDBDialect() {
super();
setLimitHandler(new AbstractLimitHandler() {
@Override
public String processSql(String sql, boolean isSubquery, boolean useLimitVariable, RowSelection selection) {
boolean hasOffset = LimitHelper.hasFirstRow(selection);
if(useLimitVariable && isUseLimitInVariableMode(isSubquery)) {
sql = "select * from (" + sql + ") where rowno < ? ";
if (hasOffset) {
sql = sql + " and rowno >= ?";
}
}else{
int firstRow = (int)convertToFirstRowValue(LimitHelper.getFirstRow(selection));
int lastRow = getMaxOrLimit(selection);
sql = "select * from (" + sql + ") where rowno < " + lastRow;
if (hasOffset) {
sql = sql + " and rowno >= " + firstRow;
}
}
return sql;
}
});
}
@Override
public boolean isSupportsLimit() {
return true;
}
@Override
public boolean isSupportsLimitOffset() {
return true;
}
@Override
public boolean isBindLimitParametersInReverseOrder() {
return false;
}
}