org.apache.jena.sdb.layout2.hash.FmtLayout2HashMySQL Maven / Gradle / Ivy

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SDB is a persistence layer for use with Apache Jena that uses an SQL database to store triples/quads.
There is a newer version: 3.17.0
/*
 * 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.jena.sdb.layout2.hash;

import static org.apache.jena.sdb.sql.SQLUtils.sqlStr ;

import java.sql.SQLException;

import org.apache.jena.sdb.SDBException ;
import org.apache.jena.sdb.layout2.* ;
import org.apache.jena.sdb.sql.MySQLEngineType ;
import org.apache.jena.sdb.sql.SDBConnection ;
import org.apache.jena.sdb.sql.SDBExceptionSQL ;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;


public class FmtLayout2HashMySQL extends FmtLayout2
{
    static private Logger log = LoggerFactory.getLogger(FmtLayout2HashMySQL.class) ;
    protected MySQLEngineType engineType ;
    
    public FmtLayout2HashMySQL(SDBConnection connection, MySQLEngineType tableType)
    { 
        super(connection) ;
        engineType = tableType ;
        if ( engineType == null )
        {
            log.error("Engine type is null") ;
            throw new SDBException("Engine type is null") ;
        }
    }

    @Override
    protected void formatTableTriples()
    {
        dropTable(TableDescTriples.name()) ;
        try { 
            connection().exec(sqlStr(
                                 "CREATE TABLE "+TableDescTriples.name()+" (",
                                 "    s BIGINT  NOT NULL ,",
                                 "    p BIGINT  NOT NULL ,",
                                 "    o BIGINT  NOT NULL ,",
                                 "    PRIMARY KEY (s, p, o)",
                                 ") ENGINE="+engineType.getEngineName()                
                    )) ;
        } catch (SQLException ex)
        {
            throw new SDBExceptionSQL("SQLException formatting table '"+TableDescTriples.name()+"'",ex) ;
        }
    }
    
    @Override
    protected void formatTableQuads()
    {
        dropTable(TableDescQuads.name()) ;
        try { 
            connection().exec(sqlStr(
                                 "CREATE TABLE "+TableDescQuads.name()+" (",
                                 "    g BIGINT  NOT NULL ,",
                                 "    s BIGINT  NOT NULL ,",
                                 "    p BIGINT  NOT NULL ,",
                                 "    o BIGINT  NOT NULL ,",
                                 "    PRIMARY KEY (g, s, p, o)",
                                 ") ENGINE="+engineType.getEngineName()                
                    )) ;
        } catch (SQLException ex)
        {
            throw new SDBExceptionSQL("SQLException formatting table '"+TableDescTriples.name()+"'",ex) ;
        }
    }
  
    @Override
    protected String syntaxDropIndex(String indexName, String table)
    {
        return String.format("DROP INDEX %s ON %s", indexName, table) ;
    }
    
    @Override
    protected void formatTableNodes()
    {
        dropTable(TableDescNodes.name()) ;
        try { 
            connection().exec(sqlStr ("CREATE TABLE "+TableDescNodes.name()+" (",
                                 "   hash BIGINT NOT NULL DEFAULT 0,",
                                 "   lex LONGTEXT BINARY CHARACTER SET utf8 ,",
                                 "   lang VARCHAR(10) BINARY CHARACTER SET utf8 NOT NULL default '',",
                                 "   datatype VARCHAR("+TableDescNodes.DatatypeUriLength+") BINARY CHARACTER SET utf8 NOT NULL default '',",
                                 "   type int unsigned NOT NULL default '0',",
                                 "   PRIMARY KEY Hash  (hash)",
                                 ") ENGINE="+engineType.getEngineName()+" DEFAULT CHARSET=utf8;"  
                    )) ;
        } catch (SQLException ex)
        {
            throw new SDBExceptionSQL("SQLException formatting table '"+TableDescNodes.name()+"'",ex) ;
        }
    }

    @Override
    protected void formatTablePrefixes()
    {
        dropTable(TablePrefixes.name()) ;
        try { 
            connection().exec(sqlStr(
                                 "CREATE TABLE "+TablePrefixes.name()+" (",
                                 "    prefix VARCHAR("+TablePrefixes.prefixColWidth+") BINARY NOT NULL ,",
                                 "    uri VARCHAR("+TablePrefixes.uriColWidth+") BINARY NOT NULL ,", 
                                 "    PRIMARY KEY  (prefix)",
                                 ") ENGINE="+engineType.getEngineName()+" DEFAULT CHARSET=utf8"            
                    )) ;
        } catch (SQLException ex)
        {
            throw new SDBExceptionSQL("SQLException resetting table '"+TablePrefixes.name()+"'",ex) ;
        }
    }
    
    @Override
    protected void truncateTable(String tableName)
    { 
        try { 
            // MySQL note: DELETE FROM is transactional, TRUNCATE is not
            connection().exec("TRUNCATE "+tableName) ;
        } catch (SQLException ex)
        { throw new SDBExceptionSQL("SQLException : Can't truncate table: "+tableName, ex) ; }
    }
    
    @Override
    protected void dropTable(String tableName)
    {
        try { 
            connection().exec("DROP TABLE IF EXISTS "+tableName) ;
        } catch (SQLException ex)
        { throw new SDBExceptionSQL("SQLException : Can't drop table: "+tableName, ex) ; }
    }

}