package org.apache.hawq.pxf.plugins.jdbc.utils; | |
/* | |
* 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. | |
*/ | |
/** | |
* A tool class to process data types that must have different form in different databases. | |
* Such processing is required to create correct constraints (WHERE statements). | |
*/ | |
public abstract class DbProduct { | |
/** | |
* Get an instance of some class - the database product | |
* | |
* @param String dbName A full name of the database | |
* @return a DbProduct of the required class | |
*/ | |
public static DbProduct getDbProduct(String dbName) { | |
if (dbName.toUpperCase().contains("MYSQL")) | |
return new MysqlProduct(); | |
else if (dbName.toUpperCase().contains("ORACLE")) | |
return new OracleProduct(); | |
else if (dbName.toUpperCase().contains("POSTGRES")) | |
return new PostgresProduct(); | |
else if (dbName.toUpperCase().contains("MICROSOFT")) | |
return new MicrosoftProduct(); | |
else | |
return new CommonProduct(); | |
} | |
/** | |
* Wraps a given date value the way required by a target database | |
* | |
* @param val {@link java.sql.Date} object to wrap | |
* @return a string with a properly wrapped date object | |
*/ | |
public abstract String wrapDate(Object val); | |
/** | |
* Wraps a given timestamp value the way required by a target database | |
* | |
* @param val {@link java.sql.Timestamp} object to wrap | |
* @return a string with a properly wrapped timestamp object | |
*/ | |
public abstract String wrapTimestamp(Object val); | |
} | |
/** | |
* Common product. Used when no other products are avalibale | |
*/ | |
class CommonProduct extends DbProduct { | |
@Override | |
public String wrapDate(Object val) { | |
return "date'" + val + "'"; | |
} | |
@Override | |
public String wrapTimestamp(Object val) { | |
return "'" + val + "'"; | |
} | |
} |