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Spring Data Relational support
/*
* Copyright 2020-2023 the original author or authors.
*
* 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
*
* https://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 org.springframework.data.relational.core.dialect;
import java.util.Collection;
import java.util.Collections;
import org.springframework.data.relational.core.sql.IdentifierProcessing;
import org.springframework.data.relational.core.sql.LockOptions;
/**
* An SQL dialect for DB2.
*
* @author Jens Schauder
* @since 2.0
*/
public class Db2Dialect extends AbstractDialect {
/**
* Singleton instance.
*/
public static final Db2Dialect INSTANCE = new Db2Dialect();
private static final IdGeneration ID_GENERATION = new IdGeneration() {
@Override
public boolean supportedForBatchOperations() {
return false;
}
};
protected Db2Dialect() {}
@Override
public IdGeneration getIdGeneration() {
return ID_GENERATION;
}
private static final LimitClause LIMIT_CLAUSE = new LimitClause() {
/*
* (non-Javadoc)
* @see org.springframework.data.relational.core.dialect.LimitClause#getLimit(long)
*/
@Override
public String getLimit(long limit) {
return "FETCH FIRST " + limit + " ROWS ONLY";
}
/*
* (non-Javadoc)
* @see org.springframework.data.relational.core.dialect.LimitClause#getOffset(long)
*/
@Override
public String getOffset(long offset) {
return "OFFSET " + offset + " ROWS";
}
/*
* (non-Javadoc)
* @see org.springframework.data.relational.core.dialect.LimitClause#getClause(long, long)
*/
@Override
public String getLimitOffset(long limit, long offset) {
return String.format("OFFSET %d ROWS FETCH FIRST %d ROWS ONLY", offset, limit);
}
/*
* (non-Javadoc)
* @see org.springframework.data.relational.core.dialect.LimitClause#getClausePosition()
*/
@Override
public Position getClausePosition() {
return Position.AFTER_ORDER_BY;
}
};
/*
* (non-Javadoc)
* @see org.springframework.data.relational.core.dialect.Dialect#limit()
*/
@Override
public LimitClause limit() {
return LIMIT_CLAUSE;
}
/*
* (non-Javadoc)
* @see org.springframework.data.relational.core.dialect.Dialect#lock()
*/
@Override
public LockClause lock() {
return new LockClause() {
@Override
public String getLock(LockOptions lockOptions) {
return "FOR UPDATE WITH RS USE AND KEEP EXCLUSIVE LOCKS";
}
@Override
public Position getClausePosition() {
return Position.AFTER_ORDER_BY;
}
};
}
/*
* (non-Javadoc)
* @see org.springframework.data.relational.core.dialect.Dialect#getIdentifierProcessing()
*/
@Override
public IdentifierProcessing getIdentifierProcessing() {
return IdentifierProcessing.ANSI;
}
@Override
public Collection