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SQLServerQueryRewriter.java
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SQLServerQueryRewriter.java
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/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 org.apache.metamodel.jdbc.dialects;
import java.text.DateFormat;
import java.util.Date;
import org.apache.metamodel.jdbc.JdbcDataContext;
import org.apache.metamodel.query.FilterItem;
import org.apache.metamodel.query.OperatorType;
import org.apache.metamodel.query.Query;
import org.apache.metamodel.query.SelectClause;
import org.apache.metamodel.query.SelectItem;
import org.apache.metamodel.schema.Column;
import org.apache.metamodel.schema.ColumnType;
import org.apache.metamodel.util.DateUtils;
public class SQLServerQueryRewriter extends OffsetFetchQueryRewriter {
public static final int FIRST_FETCH_SUPPORTING_VERSION = 11;
public SQLServerQueryRewriter(JdbcDataContext dataContext) {
super(dataContext, FIRST_FETCH_SUPPORTING_VERSION, true);
}
@Override
public boolean isMaxRowsSupported() {
return true;
}
/**
* SQL server expects the fully qualified column name, including schema, in
* select items.
*/
@Override
public boolean isSchemaIncludedInColumnPaths() {
return true;
}
@Override
protected String rewriteSelectClause(Query query, SelectClause selectClause) {
String result = super.rewriteSelectClause(query, selectClause);
Integer maxRows = query.getMaxRows();
if (maxRows != null) {
if (query.getSelectClause().isDistinct()) {
result = "SELECT DISTINCT TOP " + maxRows + " " + result.substring("SELECT DISTINCT ".length());
} else {
result = "SELECT TOP " + maxRows + " " + result.substring("SELECT ".length());
}
}
return result;
}
@Override
public String rewriteColumnType(ColumnType columnType, Integer columnSize) {
if (columnType == ColumnType.DOUBLE) {
return "FLOAT";
}
if (columnType == ColumnType.BOOLEAN) {
return "BIT";
}
if (columnType.isLiteral() && columnSize == null) {
// SQL server provides the convenient MAX parameter. If not
// specified, the default size of e.g. a VARCHAR is 1!
return rewriteColumnTypeInternal(columnType.getName(), "MAX");
}
return super.rewriteColumnType(columnType, columnSize);
}
@Override
public String rewriteFilterItem(FilterItem item) {
if (item.isCompoundFilter()) {
return super.rewriteFilterItem(item);
}
final SelectItem selectItem = item.getSelectItem();
final Object operand = item.getOperand();
final OperatorType operator = item.getOperator();
if (selectItem == null || operand == null || operator == null) {
return super.rewriteFilterItem(item);
}
final Column column = selectItem.getColumn();
if (column == null) {
return super.rewriteFilterItem(item);
}
if (operand instanceof Date) {
final String nativeType = column.getNativeType();
if ("TIMESTAMP".equalsIgnoreCase(nativeType) || "DATETIME".equalsIgnoreCase(nativeType)) {
final StringBuilder sb = new StringBuilder();
sb.append(selectItem.getSameQueryAlias(true));
FilterItem.appendOperator(sb, operand, operator);
final Date date = (Date) operand;
final DateFormat format = DateUtils.createDateFormat("yyyyMMdd HH:mm:ss");
final String dateTimeValue = "CAST('" + format.format(date) + "' AS DATETIME)";
sb.append(dateTimeValue);
return sb.toString();
}
}
return super.rewriteFilterItem(item);
}
}