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Spring Data Relational support
/*
* Copyright 2019-2023 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 org.springframework.data.relational.core.sql.IdentifierProcessing;
import org.springframework.data.relational.core.sql.LockOptions;
import org.springframework.util.Assert;
import org.springframework.util.ClassUtils;
/**
* An SQL dialect for the ANSI SQL standard.
*
* @author Milan Milanov
* @author Myeonghyeon Lee
* @since 2.0
*/
public class AnsiDialect extends AbstractDialect {
/**
* Singleton instance.
*/
public static final AnsiDialect INSTANCE = new AnsiDialect();
protected AnsiDialect() {}
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 String.format("FETCH FIRST %d ROWS ONLY", limit);
}
/*
* (non-Javadoc)
* @see org.springframework.data.relational.core.dialect.LimitClause#getOffset(long)
*/
@Override
public String getOffset(long offset) {
return String.format("OFFSET %d ROWS", offset);
}
/*
* (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;
}
};
static final LockClause LOCK_CLAUSE = new LockClause() {
/*
* (non-Javadoc)
* @see org.springframework.data.relational.core.dialect.LockClause#getLock(LockOptions)
*/
@Override
public String getLock(LockOptions lockOptions) {
return "FOR UPDATE";
}
/*
* (non-Javadoc)
* @see org.springframework.data.relational.core.dialect.LimitClause#getClausePosition()
*/
@Override
public Position getClausePosition() {
return Position.AFTER_ORDER_BY;
}
};
private final AnsiArrayColumns ARRAY_COLUMNS = new AnsiArrayColumns();
/*
* (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#getArraySupport()
*/
@Override
public ArrayColumns getArraySupport() {
return ARRAY_COLUMNS;
}
static class AnsiArrayColumns implements ArrayColumns {
/*
* (non-Javadoc)
* @see org.springframework.data.relational.core.dialect.ArrayColumns#isSupported()
*/
@Override
public boolean isSupported() {
return true;
}
/*
* (non-Javadoc)
* @see org.springframework.data.relational.core.dialect.ArrayColumns#getArrayType(java.lang.Class)
*/
@Override
public Class getArrayType(Class userType) {
Assert.notNull(userType, "Array component type must not be null");
return ClassUtils.resolvePrimitiveIfNecessary(userType);
}
}
@Override
public IdentifierProcessing getIdentifierProcessing() {
return IdentifierProcessing.ANSI;
}
}