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* Licensed to the Apache Software Foundation (ASF) under one
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* 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
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package org.apache.cayenne.merge;
import java.util.Collections;
import java.util.List;
import org.apache.cayenne.CayenneRuntimeException;
import org.apache.cayenne.dba.DbAdapter;
import org.apache.cayenne.dba.QuotingStrategy;
import org.apache.cayenne.dba.TypesMapping;
import org.apache.cayenne.map.DbAttribute;
import org.apache.cayenne.map.DbEntity;
public class AddColumnToDb extends AbstractToDbToken.EntityAndColumn {
public AddColumnToDb(DbEntity entity, DbAttribute column) {
super(entity, column);
}
/**
* append the part of the token before the actual column data type
*/
protected void appendPrefix(StringBuffer sqlBuffer, QuotingStrategy context) {
sqlBuffer.append("ALTER TABLE ");
sqlBuffer.append(context.quoteFullyQualifiedName(getEntity()));
sqlBuffer.append(" ADD COLUMN ");
sqlBuffer.append(context.quoteString(getColumn().getName()));
sqlBuffer.append(" ");
}
@Override
public List<String> createSql(DbAdapter adapter) {
StringBuffer sqlBuffer = new StringBuffer();
QuotingStrategy context = adapter.getQuotingStrategy(getEntity()
.getDataMap()
.isQuotingSQLIdentifiers());
appendPrefix(sqlBuffer, context);
// copied from JdbcAdapter.createTableAppendColumn
String[] types = adapter.externalTypesForJdbcType(getColumn().getType());
if (types == null || types.length == 0) {
String entityName = getColumn().getEntity() != null ? ((DbEntity) getColumn()
.getEntity()).getFullyQualifiedName() : "<null>";
throw new CayenneRuntimeException("Undefined type for attribute '"
+ entityName
+ "."
+ getColumn().getName()
+ "': "
+ getColumn().getType());
}
String type = types[0];
sqlBuffer.append(type);
// append size and precision (if applicable)
if (TypesMapping.supportsLength(getColumn().getType())) {
int len = getColumn().getMaxLength();
int scale = TypesMapping.isDecimal(getColumn().getType()) ? getColumn()
.getScale() : -1;
// sanity check
if (scale > len) {
scale = -1;
}
if (len > 0) {
sqlBuffer.append('(').append(len);
if (scale >= 0) {
sqlBuffer.append(", ").append(scale);
}
sqlBuffer.append(')');
}
}
// use separate token to set value and not null if needed
// sqlBuffer.append(" NULL");
return Collections.singletonList(sqlBuffer.toString());
}
public String getTokenName() {
return "Add Column";
}
public MergerToken createReverse(MergerFactory factory) {
return factory.createDropColumnToModel(getEntity(), getColumn());
}
}