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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
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* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
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package org.apache.cayenne.access.translator.batch;
import java.util.Iterator;
import java.util.List;
import org.apache.cayenne.access.translator.DbAttributeBinding;
import org.apache.cayenne.access.types.ExtendedType;
import org.apache.cayenne.dba.DbAdapter;
import org.apache.cayenne.dba.QuotingStrategy;
import org.apache.cayenne.map.DbAttribute;
import org.apache.cayenne.query.BatchQueryRow;
import org.apache.cayenne.query.UpdateBatchQuery;
/**
* A translator for UpdateBatchQueries that produces parameterized SQL.
*/
public class UpdateBatchTranslator extends DefaultBatchTranslator {
public UpdateBatchTranslator(UpdateBatchQuery query, DbAdapter adapter, String trimFunction) {
super(query, adapter, trimFunction);
}
@Override
protected String createSql() {
UpdateBatchQuery updateBatch = (UpdateBatchQuery) query;
QuotingStrategy strategy = adapter.getQuotingStrategy();
List<DbAttribute> qualifierAttributes = updateBatch.getQualifierAttributes();
List<DbAttribute> updatedDbAttributes = updateBatch.getUpdatedAttributes();
StringBuilder buffer = new StringBuilder("UPDATE ");
buffer.append(strategy.quotedFullyQualifiedName(query.getDbEntity()));
buffer.append(" SET ");
int len = updatedDbAttributes.size();
for (int i = 0; i < len; i++) {
if (i > 0) {
buffer.append(", ");
}
DbAttribute attribute = updatedDbAttributes.get(i);
buffer.append(strategy.quotedName(attribute));
buffer.append(" = ?");
}
buffer.append(" WHERE ");
Iterator<DbAttribute> i = qualifierAttributes.iterator();
while (i.hasNext()) {
DbAttribute attribute = i.next();
appendDbAttribute(buffer, attribute);
buffer.append(updateBatch.isNull(attribute) ? " IS NULL" : " = ?");
if (i.hasNext()) {
buffer.append(" AND ");
}
}
return buffer.toString();
}
@Override
protected DbAttributeBinding[] createBindings() {
UpdateBatchQuery updateBatch = (UpdateBatchQuery) query;
List<DbAttribute> updatedDbAttributes = updateBatch.getUpdatedAttributes();
List<DbAttribute> qualifierAttributes = updateBatch.getQualifierAttributes();
int ul = updatedDbAttributes.size();
int ql = qualifierAttributes.size();
DbAttributeBinding[] bindings = new DbAttributeBinding[ul + ql];
for (int i = 0; i < ul; i++) {
bindings[i] = new DbAttributeBinding(updatedDbAttributes.get(i));
}
for (int i = 0; i < ql; i++) {
bindings[ul + i] = new DbAttributeBinding(qualifierAttributes.get(i));
}
return bindings;
}
@Override
protected DbAttributeBinding[] doUpdateBindings(BatchQueryRow row) {
UpdateBatchQuery updateBatch = (UpdateBatchQuery) query;
List<DbAttribute> updatedDbAttributes = updateBatch.getUpdatedAttributes();
List<DbAttribute> qualifierAttributes = updateBatch.getQualifierAttributes();
int ul = updatedDbAttributes.size();
int ql = qualifierAttributes.size();
int j = 1;
for (int i = 0; i < ul; i++) {
Object value = row.getValue(i);
ExtendedType extendedType = value != null
? adapter.getExtendedTypes().getRegisteredType(value.getClass())
: adapter.getExtendedTypes().getDefaultType();
bindings[i].include(j++, value, extendedType);
}
for (int i = 0; i < ql; i++) {
DbAttribute a = qualifierAttributes.get(i);
// skip null attributes... they are translated as "IS NULL"
if (updateBatch.isNull(a)) {
continue;
}
Object value = row.getValue(ul + i);
ExtendedType extendedType = value != null
? adapter.getExtendedTypes().getRegisteredType(value.getClass())
: adapter.getExtendedTypes().getDefaultType();
bindings[ul + i].include(j++, value, extendedType);
}
return bindings;
}
}