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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
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*
* 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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package org.apache.cayenne.dba.firebird;
import java.util.Collections;
import java.util.List;
import org.apache.cayenne.dba.DbAdapter;
import org.apache.cayenne.dba.QuotingStrategy;
import org.apache.cayenne.map.DbAttribute;
import org.apache.cayenne.map.DbEntity;
import org.apache.cayenne.merge.MergerFactory;
import org.apache.cayenne.merge.MergerToken;
import org.apache.cayenne.merge.AddColumnToDb;
import org.apache.cayenne.merge.DropColumnToDb;
import org.apache.cayenne.merge.SetNotNullToDb;
import org.apache.cayenne.merge.SetAllowNullToDb;
public class FirebirdMergerFactory extends MergerFactory {
public MergerToken createDropColumnToDb(DbEntity entity, DbAttribute column) {
return new DropColumnToDb(entity, column) {
public List<String> createSql(DbAdapter adapter) {
QuotingStrategy quoting = adapter.getQuotingStrategy();
StringBuilder builder = new StringBuilder("ALTER TABLE ");
builder.append(quoting.quotedFullyQualifiedName(getEntity()));
builder.append(" DROP ").append(quoting.quotedName(getColumn()));
return Collections.singletonList(builder.toString());
}
};
}
@Override
public MergerToken createSetNotNullToDb(DbEntity entity, DbAttribute column) {
return new SetNotNullToDb(entity, column) {
public List<String> createSql(DbAdapter adapter) {
QuotingStrategy context = adapter.getQuotingStrategy();
String entityName = context.quotedFullyQualifiedName(getEntity()) ;
String columnName = context.quotedName(getColumn());
// Firebird doesn't support ALTER TABLE table_name ALTER column_name SET NOT NULL
// but this might be achived by modyfication of system tables
return Collections.singletonList(String.format("UPDATE RDB$RELATION_FIELDS SET RDB$NULL_FLAG = 1 "+
"WHERE RDB$FIELD_NAME = '%s' AND RDB$RELATION_NAME = '%s'", columnName, entityName));
}
};
}
@Override
public MergerToken createSetAllowNullToDb(DbEntity entity, DbAttribute column) {
return new SetAllowNullToDb(entity, column) {
public List<String> createSql(DbAdapter adapter) {
QuotingStrategy context = adapter.getQuotingStrategy();
String entityName = context.quotedFullyQualifiedName(getEntity()) ;
String columnName = context.quotedName(getColumn());
// Firebird doesn't support ALTER TABLE table_name ALTER column_name DROP NOT NULL
// but this might be achived by modyfication system tables
return Collections.singletonList(String.format("UPDATE RDB$RELATION_FIELDS SET RDB$NULL_FLAG = NULL "+
" WHERE RDB$FIELD_NAME = '%s' AND RDB$RELATION_NAME = '%s'", columnName, entityName));
}
};
}
public MergerToken createAddColumnToDb(DbEntity entity, DbAttribute column) {
return new AddColumnToDb(entity, column) {
protected void appendPrefix(StringBuffer sqlBuffer, QuotingStrategy context) {
sqlBuffer.append("ALTER TABLE ");
sqlBuffer.append(context.quotedFullyQualifiedName(getEntity()));
sqlBuffer.append(" ADD ");
sqlBuffer.append(context.quotedName(getColumn()));
sqlBuffer.append(" ");
}
};
}
}