/*
* Copyright 2013, Mysema Ltd
*
* Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
* 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.mysema.query.sql;
import com.mysema.query.QueryFlag;
import com.mysema.query.QueryFlag.Position;
import com.mysema.query.QueryMetadata;
import com.mysema.query.QueryModifiers;
import com.mysema.query.support.Expressions;
/**
* SQLServer2012Templates is an SQL dialect for Microsoft SQL Server 2012 and later
*
* @author tiwe
*
*/
public class SQLServer2012Templates extends SQLServerTemplates {
private String topTemplate = "top {0s} ";
private String limitOffsetTemplate = "\noffset {1} rows fetch next {0} rows only";
private String offsetTemplate = "\noffset {0} rows";
public static Builder builder() {
return new Builder() {
@Override
protected SQLTemplates build(char escape, boolean quote) {
return new SQLServer2012Templates(escape, quote);
}
};
}
public SQLServer2012Templates() {
this('\\',false);
}
public SQLServer2012Templates(boolean quote) {
this('\\',quote);
}
public SQLServer2012Templates(char escape, boolean quote) {
super(escape, quote);
}
@Override
public void serialize(QueryMetadata metadata, boolean forCountRow, SQLSerializer context) {
if (!forCountRow && metadata.getModifiers().isRestricting() && metadata.getOrderBy().isEmpty()
&& !metadata.getJoins().isEmpty()) {
QueryModifiers mod = metadata.getModifiers();
// use top if order by is empty
if (mod.getOffset() == null) {
// select top ...
metadata = metadata.clone();
metadata.addFlag(new QueryFlag(QueryFlag.Position.AFTER_SELECT,
Expressions.template(Integer.class, topTemplate, mod.getLimit())));
context.serializeForQuery(metadata, forCountRow);
} else {
throw new IllegalStateException("offset not supported without order by");
}
} else {
context.serializeForQuery(metadata, forCountRow);
}
if (!metadata.getFlags().isEmpty()) {
context.serialize(Position.END, metadata.getFlags());
}
}
@Override
protected void serializeModifiers(QueryMetadata metadata, SQLSerializer context) {
if (!metadata.getOrderBy().isEmpty()) {
QueryModifiers mod = metadata.getModifiers();
if (mod.getLimit() == null) {
context.handle(offsetTemplate, mod.getOffset());
} else if (mod.getOffset() == null) {
context.handle(limitOffsetTemplate, mod.getLimit(), 0);
} else {
context.handle(limitOffsetTemplate, mod.getLimit(), mod.getOffset());
}
}
}
}