git-svn-id: https://svn.berlios.de/svnroot/repos/yacy/trunk@4042 6c8d7289-2bf4-0310-a012-ef5d649a1542pull/1/head
orbiter
18 years ago
parent
5cf634a4a4
commit
3ca8f71cbb
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// kelondroSQLTable.java
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// this class was written by Martin Thelian
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// (the class was once a sub-class of dbtest.java)
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//
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// This is a part of YaCy, a peer-to-peer based web search engine
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//
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// $LastChangedDate: 2006-04-02 22:40:07 +0200 (So, 02 Apr 2006) $
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// $LastChangedRevision: 1986 $
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// $LastChangedBy: orbiter $
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//
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// LICENSE
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//
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 2 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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package de.anomic.kelondro;
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import java.io.IOException;
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import java.sql.Connection;
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import java.sql.DriverManager;
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import java.sql.PreparedStatement;
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import java.sql.ResultSet;
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import java.sql.SQLException;
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import java.util.Date;
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import java.util.Iterator;
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import java.util.List;
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import de.anomic.kelondro.kelondroRow.Entry;
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/*
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* Commands to create a database using mysql:
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*
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* CREATE database yacy;
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* USE yacy;
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* CREATE TABLE hash CHAR(12) not null primary key, value BLOB);
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* insert into user (Host, User, Password) values ('%','yacy',password('yacy'));
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* insert into db (User, Db, Select_priv, Insert_priv, Update_priv, Delete_priv) values ('yacy@%','yacy','Y','Y','Y','Y')
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* grant ALL on yacy.* to yacy;
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*/
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public class kelondroSQLTable implements kelondroIndex {
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private final String db_driver_str_mysql = "org.gjt.mm.mysql.Driver";
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private final String db_driver_str_pgsql = "org.postgresql.Driver";
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private final String db_conn_str_mysql = "jdbc:mysql://192.168.0.2:3306/yacy";
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private final String db_conn_str_pgsql = "jdbc:postgresql://192.168.0.2:5432";
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private final String db_usr_str = "yacy";
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private final String db_pwd_str = "yacy";
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private Connection theDBConnection = null;
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private final kelondroOrder order = new kelondroNaturalOrder(true);
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private kelondroRow rowdef;
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public kelondroSQLTable(String dbType, kelondroRow rowdef) throws Exception {
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this.rowdef = rowdef;
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openDatabaseConnection(dbType);
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}
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private void openDatabaseConnection(String dbType) throws Exception{
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if (dbType == null) throw new IllegalArgumentException();
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String dbDriverStr = null, dbConnStr = null;
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if (dbType.equalsIgnoreCase("mysql")) {
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dbDriverStr = db_driver_str_mysql;
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dbConnStr = db_conn_str_mysql;
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} else if (dbType.equalsIgnoreCase("pgsql")) {
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dbDriverStr = db_driver_str_pgsql;
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dbConnStr = db_conn_str_pgsql;
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}
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try {
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Class.forName(dbDriverStr).newInstance();
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} catch (Exception e) {
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throw new Exception ("Unable to load the jdbc driver: " + e.getMessage(),e);
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}
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try {
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this.theDBConnection = DriverManager.getConnection (dbConnStr,this.db_usr_str,this.db_pwd_str);
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} catch (Exception e) {
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throw new Exception ("Unable to establish a database connection: " + e.getMessage(),e);
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}
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}
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public String filename() {
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return "dbtest." + theDBConnection.hashCode();
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}
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public void close() {
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if (this.theDBConnection != null) try {
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this.theDBConnection.close();
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} catch (SQLException e) {
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e.printStackTrace();
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}
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this.theDBConnection = null;
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}
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public int size() {
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int size = -1;
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try {
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String sqlQuery = new String
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(
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"SELECT count(value) from test"
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);
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PreparedStatement sqlStatement = this.theDBConnection.prepareStatement(sqlQuery);
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ResultSet result = sqlStatement.executeQuery();
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while (result.next()) {
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size = result.getInt(1);
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}
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result.close();
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sqlStatement.close();
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return size;
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} catch (Exception e) {
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e.printStackTrace();
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return -1;
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}
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}
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public kelondroRow row() {
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return this.rowdef;
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}
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public boolean has(byte[] key) throws IOException {
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return (get(key) != null);
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}
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public kelondroRow.Entry get(byte[] key) throws IOException {
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try {
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String sqlQuery = new String
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(
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"SELECT value from test where hash = ?"
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);
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PreparedStatement sqlStatement = this.theDBConnection.prepareStatement(sqlQuery);
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sqlStatement.setString(1, new String(key));
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byte[] value = null;
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ResultSet result = sqlStatement.executeQuery();
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while (result.next()) {
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value = result.getBytes("value");
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}
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result.close();
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sqlStatement.close();
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if (value == null) return null;
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kelondroRow.Entry entry = this.rowdef.newEntry(value);
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return entry;
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} catch (Exception e) {
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throw new IOException(e.getMessage());
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}
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}
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public synchronized void putMultiple(List rows) throws IOException {
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Iterator i = rows.iterator();
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while (i.hasNext()) put((Entry) i.next());
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}
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public kelondroRow.Entry put(kelondroRow.Entry row, Date entryDate) throws IOException {
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return put(row);
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}
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public kelondroRow.Entry put(kelondroRow.Entry row) throws IOException {
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try {
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kelondroRow.Entry oldEntry = remove(row.getColBytes(0));
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String sqlQuery = new String
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(
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"INSERT INTO test (" +
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"hash, " +
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"value) " +
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"VALUES (?,?)"
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);
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PreparedStatement sqlStatement = this.theDBConnection.prepareStatement(sqlQuery);
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sqlStatement.setString(1, new String(row.getColString(0, null)));
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sqlStatement.setBytes(2, row.bytes());
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sqlStatement.execute();
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sqlStatement.close();
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return oldEntry;
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} catch (Exception e) {
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throw new IOException(e.getMessage());
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}
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}
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public synchronized void addUnique(kelondroRow.Entry row) throws IOException {
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throw new UnsupportedOperationException();
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}
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public synchronized void addUnique(kelondroRow.Entry row, Date entryDate) {
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throw new UnsupportedOperationException();
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}
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public synchronized void addUniqueMultiple(List rows) throws IOException {
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throw new UnsupportedOperationException();
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}
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public kelondroRow.Entry remove(byte[] key) throws IOException {
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try {
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kelondroRow.Entry entry = this.get(key);
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if (entry == null) return entry;
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String sqlQuery = new String
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(
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"DELETE FROM test WHERE hash = ?"
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);
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PreparedStatement sqlStatement = this.theDBConnection.prepareStatement(sqlQuery);
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sqlStatement.setString(1, new String(key));
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sqlStatement.execute();
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return entry;
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} catch (Exception e) {
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throw new IOException(e.getMessage());
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}
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}
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public kelondroRow.Entry removeOne() {
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return null;
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}
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public kelondroCloneableIterator rows(boolean up, byte[] startKey) throws IOException {
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// Objects are of type byte[][]
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return null;
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}
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public Iterator keys(boolean up, boolean rotating, byte[] startKey) {
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// Objects are of type String
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return null;
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}
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public int columns() {
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// TODO Auto-generated method stub
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return 0;
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}
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public int columnSize(int column) {
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// TODO Auto-generated method stub
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return 0;
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}
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public kelondroOrder order() {
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return this.order;
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}
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public int primarykey() {
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return 0;
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}
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public kelondroProfile profile() {
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return new kelondroProfile();
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}
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public final int cacheObjectChunkSize() {
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// dummy method
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return -1;
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}
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public long[] cacheObjectStatus() {
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// dummy method
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return null;
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}
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public final int cacheNodeChunkSize() {
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return -1;
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}
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public final int[] cacheNodeStatus() {
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return new int[]{0,0,0,0,0,0,0,0,0,0};
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}
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public void reset() {
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// TODO Auto-generated method stub
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}
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}
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