package org.apache.ddlutils.platform.derby; | |
/* | |
* 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. | |
*/ | |
import java.sql.SQLException; | |
import java.util.Map; | |
import org.apache.ddlutils.Platform; | |
import org.apache.ddlutils.model.Column; | |
import org.apache.ddlutils.model.ForeignKey; | |
import org.apache.ddlutils.model.Index; | |
import org.apache.ddlutils.model.Table; | |
import org.apache.ddlutils.model.TypeMap; | |
import org.apache.ddlutils.platform.DatabaseMetaDataWrapper; | |
import org.apache.ddlutils.platform.JdbcModelReader; | |
/** | |
* Reads a database model from a Derby database. | |
* | |
* @version $Revision: $ | |
*/ | |
public class DerbyModelReader extends JdbcModelReader | |
{ | |
/** | |
* Creates a new model reader for Derby databases. | |
* | |
* @param platform The platform that this model reader belongs to | |
*/ | |
public DerbyModelReader(Platform platform) | |
{ | |
super(platform); | |
} | |
/** | |
* {@inheritDoc} | |
*/ | |
protected Column readColumn(DatabaseMetaDataWrapper metaData, Map values) throws SQLException | |
{ | |
Column column = super.readColumn(metaData, values); | |
String defaultValue = column.getDefaultValue(); | |
if (defaultValue != null) | |
{ | |
// we check for these strings | |
// GENERATED_BY_DEFAULT -> 'GENERATED BY DEFAULT AS IDENTITY' | |
// AUTOINCREMENT: start 1 increment 1 -> 'GENERATED ALWAYS AS IDENTITY' | |
if ("GENERATED_BY_DEFAULT".equals(defaultValue) || defaultValue.startsWith("AUTOINCREMENT:")) | |
{ | |
column.setDefaultValue(null); | |
column.setAutoIncrement(true); | |
} | |
else if (TypeMap.isTextType(column.getTypeCode())) | |
{ | |
column.setDefaultValue(unescape(defaultValue, "'", "''")); | |
} | |
} | |
return column; | |
} | |
/** | |
* {@inheritDoc} | |
*/ | |
protected boolean isInternalForeignKeyIndex(DatabaseMetaDataWrapper metaData, Table table, ForeignKey fk, Index index) | |
{ | |
return isInternalIndex(index); | |
} | |
/** | |
* {@inheritDoc} | |
*/ | |
protected boolean isInternalPrimaryKeyIndex(DatabaseMetaDataWrapper metaData, Table table, Index index) | |
{ | |
return isInternalIndex(index); | |
} | |
/** | |
* Determines whether the index is an internal index, i.e. one created by Derby. | |
* | |
* @param index The index to check | |
* @return <code>true</code> if the index seems to be an internal one | |
*/ | |
private boolean isInternalIndex(Index index) | |
{ | |
String name = index.getName(); | |
// Internal names normally have the form "SQL051228005030780" | |
if ((name != null) && name.startsWith("SQL")) | |
{ | |
try | |
{ | |
Long.parseLong(name.substring(3)); | |
return true; | |
} | |
catch (NumberFormatException ex) | |
{ | |
// we ignore it | |
} | |
} | |
return false; | |
} | |
} |