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Spring Data Relational support
/*
* Copyright 2019-2022 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 org.springframework.data.relational.core.sql.IdentifierProcessing;
import org.springframework.data.relational.core.sql.LockOptions;
import org.springframework.data.relational.core.sql.render.SelectRenderContext;
import org.springframework.data.util.Lazy;
/**
* An SQL dialect for Microsoft SQL Server.
*
* @author Mark Paluch
* @author Myeonghyeon Lee
* @author Jens Schauder
* @since 1.1
*/
public class SqlServerDialect extends AbstractDialect {
/**
* Singleton instance.
*/
public static final SqlServerDialect INSTANCE = new SqlServerDialect();
protected SqlServerDialect() {}
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 "OFFSET 0 ROWS FETCH NEXT " + 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 NEXT %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;
}
};
private static final LockClause LOCK_CLAUSE = new LockClause() {
/*
* (non-Javadoc)
* @see org.springframework.data.relational.core.dialect.LockClause#getLimit(LockOptions)
*/
@Override
public String getLock(LockOptions lockOptions) {
switch (lockOptions.getLockMode()) {
case PESSIMISTIC_WRITE:
return "WITH (UPDLOCK, ROWLOCK)";
case PESSIMISTIC_READ:
return "WITH (HOLDLOCK, ROWLOCK)";
default:
return "";
}
}
/*
* (non-Javadoc)
* @see org.springframework.data.relational.core.dialect.LimitClause#getClausePosition()
*/
@Override
public Position getClausePosition() {
return Position.AFTER_FROM_TABLE;
}
};
private final Lazy selectRenderContext = Lazy
.of(() -> new SqlServerSelectRenderContext(getAfterFromTable(), getAfterOrderBy()));
/*
* (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 LOCK_CLAUSE;
}
/*
* (non-Javadoc)
* @see org.springframework.data.relational.core.dialect.Dialect#getLikeEscaper()
*/
@Override
public Escaper getLikeEscaper() {
return Escaper.DEFAULT.withRewriteFor("[", "]");
}
/*
* (non-Javadoc)
* @see org.springframework.data.relational.core.dialect.AbstractDialect#getSelectContext()
*/
@Override
public SelectRenderContext getSelectContext() {
return selectRenderContext.get();
}
@Override
public IdentifierProcessing getIdentifierProcessing() {
return IdentifierProcessing.NONE;
}
}