/**
* 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.
*/
package org.apache.mahout.cf.taste.impl.model.jdbc;
import javax.sql.DataSource;
import org.apache.mahout.cf.taste.common.TasteException;
import org.apache.mahout.cf.taste.impl.common.jdbc.AbstractJDBCComponent;
/**
* <p>
* See also {@link MySQLJDBCDataModel} -- same except deals with a table without preference info:
* </p>
*
* <p>
*
* <pre>
* CREATE TABLE taste_preferences (
* user_id BIGINT NOT NULL,
* item_id BIGINT NOT NULL,
* PRIMARY KEY (user_id, item_id),
* INDEX (user_id),
* INDEX (item_id)
* )
* </pre>
*
* </p>
*/
public class MySQLBooleanPrefJDBCDataModel extends AbstractBooleanPrefJDBCDataModel {
/**
* <p>
* Creates a using the default {@link javax.sql.DataSource} (named
* {@link #DEFAULT_DATASOURCE_NAME} and default table/column names.
* </p>
*
* @throws org.apache.mahout.cf.taste.common.TasteException
* if {@link javax.sql.DataSource} can't be found
*/
public MySQLBooleanPrefJDBCDataModel() throws TasteException {
this(DEFAULT_DATASOURCE_NAME);
}
/**
* <p>
* Creates a using the default {@link javax.sql.DataSource} found
* under the given name, and using default table/column names.
* </p>
*
* @param dataSourceName
* name of {@link javax.sql.DataSource} to look up
* @throws org.apache.mahout.cf.taste.common.TasteException
* if {@link javax.sql.DataSource} can't be found
*/
public MySQLBooleanPrefJDBCDataModel(String dataSourceName) throws TasteException {
this(AbstractJDBCComponent.lookupDataSource(dataSourceName),
DEFAULT_PREFERENCE_TABLE,
DEFAULT_USER_ID_COLUMN,
DEFAULT_ITEM_ID_COLUMN,
DEFAULT_PREFERENCE_TIME_COLUMN);
}
/**
* <p>
* Creates a using the given {@link javax.sql.DataSource} and default
* table/column names.
* </p>
*
* @param dataSource
* {@link javax.sql.DataSource} to use
*/
public MySQLBooleanPrefJDBCDataModel(DataSource dataSource) {
this(dataSource,
DEFAULT_PREFERENCE_TABLE,
DEFAULT_USER_ID_COLUMN,
DEFAULT_ITEM_ID_COLUMN,
DEFAULT_PREFERENCE_TIME_COLUMN);
}
/**
* <p>
* Creates a using the given {@link javax.sql.DataSource} and default
* table/column names.
* </p>
*
* @param dataSource
* {@link javax.sql.DataSource} to use
* @param preferenceTable
* name of table containing preference data
* @param userIDColumn
* user ID column name
* @param itemIDColumn
* item ID column name
* @param timestampColumn timestamp column name (may be null)
*/
public MySQLBooleanPrefJDBCDataModel(DataSource dataSource,
String preferenceTable,
String userIDColumn,
String itemIDColumn,
String timestampColumn) {
super(dataSource, preferenceTable, userIDColumn, itemIDColumn,
NO_SUCH_COLUMN,
// getPreferenceSQL
"SELECT 1 FROM " + preferenceTable + " WHERE " + userIDColumn + "=? AND " + itemIDColumn + "=?",
// getPreferenceTimeSQL
"SELECT " + timestampColumn + " FROM " + preferenceTable + " WHERE " + userIDColumn + "=? AND "
+ itemIDColumn + "=?",
// getUserSQL
"SELECT DISTINCT " + userIDColumn + ", " + itemIDColumn + " FROM " + preferenceTable + " WHERE "
+ userIDColumn + "=?",
// getAllUsersSQL
"SELECT DISTINCT " + userIDColumn + ", " + itemIDColumn + " FROM " + preferenceTable + " ORDER BY "
+ userIDColumn,
// getNumItemsSQL
"SELECT COUNT(DISTINCT " + itemIDColumn + ") FROM " + preferenceTable,
// getNumUsersSQL
"SELECT COUNT(DISTINCT " + userIDColumn + ") FROM " + preferenceTable,
// setPreferenceSQL
"INSERT IGNORE INTO " + preferenceTable + '(' + userIDColumn + ',' + itemIDColumn + ") VALUES (?,?)",
// removePreference SQL
"DELETE FROM " + preferenceTable + " WHERE " + userIDColumn + "=? AND " + itemIDColumn + "=?",
// getUsersSQL
"SELECT DISTINCT " + userIDColumn + " FROM " + preferenceTable + " ORDER BY " + userIDColumn,
// getItemsSQL
"SELECT DISTINCT " + itemIDColumn + " FROM " + preferenceTable + " ORDER BY " + itemIDColumn,
// getPrefsForItemSQL
"SELECT DISTINCT " + userIDColumn + ", " + itemIDColumn + " FROM " + preferenceTable + " WHERE "
+ itemIDColumn + "=? ORDER BY " + userIDColumn,
// getNumPreferenceForItemSQL
"SELECT COUNT(1) FROM " + preferenceTable + " WHERE " + itemIDColumn + "=?",
// getNumPreferenceForItemsSQL
"SELECT COUNT(1) FROM " + preferenceTable + " tp1 JOIN " + preferenceTable + " tp2 " + "USING ("
+ userIDColumn + ") WHERE tp1." + itemIDColumn + "=? and tp2." + itemIDColumn + "=?",
// getMaxPreferenceSQL
"SELECT 1.0",
// getMinPreferenceSQL
"SELECT 1.0");
}
@Override
protected int getFetchSize() {
// Need to return this for MySQL Connector/J to make it use streaming mode
return Integer.MIN_VALUE;
}
}