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h2/src/main/org/h2/fulltext/FullTextLucene.java.txt 0 → 100644
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/*
* Copyright 2004-2007 H2 Group. Licensed under the H2 License, Version 1.0 (http://h2database.com/html/license.html).
* Initial Developer: H2 Group
*/
package org.h2.fulltext;
import java.io.IOException;
import java.sql.Connection;
import java.sql.DatabaseMetaData;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.sql.Types;
import java.util.ArrayList;
import java.util.HashMap;
import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.analysis.standard.StandardAnalyzer;
import org.apache.lucene.document.DateTools;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;
import org.apache.lucene.index.IndexModifier;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.index.Term;
import org.apache.lucene.queryParser.QueryParser;
import org.apache.lucene.search.Hits;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.search.Query;
import org.apache.lucene.search.Searcher;
import org.h2.api.Trigger;
import org.h2.tools.SimpleResultSet;
import org.h2.util.ByteUtils;
import org.h2.util.FileUtils;
import org.h2.util.StringUtils;
public class FullTextLucene implements Trigger {
private static HashMap indexers = new HashMap();
private static final String FIELD_DATA = "data";
private static final String FIELD_QUERY = "query";
private static final String FIELD_COLUMN_PREFIX = "_";
private static final String TRIGGER_PREFIX = "FTL_";
private static final String SCHEMA = "FTL";
private IndexModifier indexer;
private String schemaName;
private String tableName;
private int[] keys;
private int[] indexColumns;
private String[] columnNames;
private int[] dataTypes;
/**
* Create a new full text index for a table and column list. Each table may only have one index at any time.
*
* @param conn the connection
* @param name the name of the index (must be unique)
* @param schema the schema name of the table
* @param table the table name
* @param columnList the column list (null for all columns)
*/
public static void createIndex(Connection conn, String schema, String table, String columnList) throws SQLException {
init(conn);
PreparedStatement prep = conn.prepareStatement("INSERT INTO "+SCHEMA+".INDEXES(SCHEMA, TABLE, COLUMNS) VALUES(?, ?, ?)");
prep.setString(1, schema);
prep.setString(2, table);
prep.setString(3, columnList);
prep.execute();
createTrigger(conn, schema, table);
indexExistingRows(conn, schema, table);
}
private static void createTrigger(Connection conn, String schema, String table) throws SQLException {
Statement stat = conn.createStatement();
String trigger = StringUtils.quoteIdentifier(schema) + "." + StringUtils.quoteIdentifier(TRIGGER_PREFIX + table);
stat.execute("DROP TRIGGER IF EXISTS " + trigger);
StringBuffer buff = new StringBuffer("CREATE TRIGGER IF NOT EXISTS ");
buff.append(trigger);
buff.append(" AFTER INSERT, UPDATE, DELETE ON ");
buff.append(StringUtils.quoteIdentifier(schema) + "." + StringUtils.quoteIdentifier(table));
buff.append(" FOR EACH ROW CALL \"");
buff.append(FullTextLucene.class.getName());
buff.append("\"");
stat.execute(buff.toString());
}
private static void indexExistingRows(Connection conn, String schema, String table) throws SQLException {
FullTextLucene existing = new FullTextLucene();
existing.init(conn, schema, null, table);
StringBuffer buff = new StringBuffer("SELECT * FROM ");
buff.append(StringUtils.quoteIdentifier(schema) + "." + StringUtils.quoteIdentifier(table));
ResultSet rs = conn.createStatement().executeQuery(buff.toString());
int columnCount = rs.getMetaData().getColumnCount();
while (rs.next()) {
Object[] row = new Object[columnCount];
for (int i = 0; i < columnCount; i++) {
row[i] = rs.getObject(i + 1);
}
existing.fire(conn, null, row);
}
}
/**
* Re-creates the full text index for this database
*
* @param conn the connection
*/
public static void reindex(Connection conn) throws SQLException {
init(conn);
removeAllTriggers(conn);
removeIndexFiles(conn);
Statement stat = conn.createStatement();
ResultSet rs = stat.executeQuery("SELECT * FROM "+SCHEMA+".INDEXES");
while (rs.next()) {
String schema = rs.getString("SCHEMA");
String table = rs.getString("TABLE");
createTrigger(conn, schema, table);
indexExistingRows(conn, schema, table);
}
}
private static void removeAllTriggers(Connection conn) throws SQLException {
Statement stat = conn.createStatement();
ResultSet rs = stat.executeQuery("SELECT * FROM INFORMATION_SCHEMA.TRIGGERS");
Statement stat2 = conn.createStatement();
while (rs.next()) {
String schema = rs.getString("TRIGGER_SCHEMA");
String name = rs.getString("TRIGGER_NAME");
if (name.startsWith(TRIGGER_PREFIX)) {
name = StringUtils.quoteIdentifier(schema) + "." + StringUtils.quoteIdentifier(name);
stat2.execute("DROP TRIGGER " + name);
}
}
}
private static void removeIndexFiles(Connection conn) throws SQLException {
String path = getIndexPath(conn);
IndexModifier index = (IndexModifier) indexers.get(path);
if (index != null) {
indexers.remove(path);
try {
index.flush();
index.close();
} catch (IOException e) {
throw convertException(e);
}
}
FileUtils.deleteRecursive(path);
}
/**
* Drops all full text indexes from the database.
*
* @param conn the connection
*/
public static void dropAll(Connection conn) throws SQLException {
Statement stat = conn.createStatement();
stat.execute("DROP SCHEMA IF EXISTS " + SCHEMA);
removeAllTriggers(conn);
removeIndexFiles(conn);
}
/**
* Initializes full text search functionality for this database. This adds the following Java functions to the
* database:
* <ul>
* <li>FTL_CREATE_INDEX(schemaNameString, tableNameString, columnListString)
* </li><li>FTL_SEARCH(queryString, limitInt, offsetInt): result set
* </li><li>FTL_REINDEX()
* </li><li>FTL_DROP_ALL()
* </li></ul>
* It also adds a schema FTL to the database where bookkeeping information is stored. This function may be
* called from a Java application, or by using the SQL statements:
*
* <pre>
* CREATE ALIAS IF NOT EXISTS FTL_INIT FOR &quot;org.h2.fulltext.FullTextLucene.init&quot;;
* CALL FTL_INIT();
* </pre>
*
* @param conn
*/
public static void init(Connection conn) throws SQLException {
Statement stat = conn.createStatement();
stat.execute("CREATE SCHEMA IF NOT EXISTS " + SCHEMA);
stat.execute("CREATE TABLE IF NOT EXISTS "+SCHEMA+".INDEXES(SCHEMA VARCHAR, TABLE VARCHAR, COLUMNS VARCHAR, PRIMARY KEY(SCHEMA, TABLE))");
stat.execute("CREATE ALIAS IF NOT EXISTS FTL_CREATE_INDEX FOR \"" + FullTextLucene.class.getName() + ".createIndex\"");
stat.execute("CREATE ALIAS IF NOT EXISTS FTL_SEARCH FOR \"" + FullTextLucene.class.getName() + ".search\"");
stat.execute("CREATE ALIAS IF NOT EXISTS FTL_REINDEX FOR \"" + FullTextLucene.class.getName() + ".reindex\"");
stat.execute("CREATE ALIAS IF NOT EXISTS FTL_DROP_ALL FOR \"" + FullTextLucene.class.getName() + ".dropAll\"");
}
private static IndexModifier getIndexModifier(Connection conn) throws SQLException {
try {
String path = getIndexPath(conn);
IndexModifier indexer;
synchronized (indexers) {
indexer = (IndexModifier) indexers.get(path);
if (indexer == null) {
// TODO: create flag = true means re-create
indexer = new IndexModifier(path, new StandardAnalyzer(), true);
indexers.put(path, indexer);
}
}
return indexer;
} catch (IOException e) {
throw convertException(e);
}
}
private static String getIndexPath(Connection conn) throws SQLException {
Statement stat = conn.createStatement();
ResultSet rs = stat.executeQuery("CALL DATABASE_PATH()");
rs.next();
String path = rs.getString(1);
if (path == null) {
throw new SQLException("FULLTEXT", "Fulltext search for in-memory databases is not supported.");
}
rs.close();
return path;
}
/**
* INTERNAL
*/
public void init(Connection conn, String schemaName, String triggerName, String tableName) throws SQLException {
init(conn);
this.schemaName = schemaName;
this.tableName = tableName;
this.indexer = getIndexModifier(conn);
ArrayList keyList = new ArrayList();
DatabaseMetaData meta = conn.getMetaData();
ResultSet rs = meta.getColumns(null, schemaName, tableName, null);
ArrayList columnList = new ArrayList();
while (rs.next()) {
columnList.add(rs.getString("COLUMN_NAME"));
}
dataTypes = new int[columnList.size()];
columnNames = new String[columnList.size()];
columnList.toArray(columnNames);
rs = meta.getColumns(null, schemaName, tableName, null);
for (int i = 0; rs.next(); i++) {
dataTypes[i] = rs.getInt("DATA_TYPE");
}
if (keyList.size() == 0) {
rs = meta.getPrimaryKeys(null, schemaName, tableName);
while (rs.next()) {
keyList.add(rs.getString("COLUMN_NAME"));
}
}
if (keyList.size() == 0) {
throw new SQLException("No primary key for table " + tableName);
}
ArrayList indexList = new ArrayList();
PreparedStatement prep = conn.prepareStatement("SELECT COLUMNS FROM "+SCHEMA+".INDEXES WHERE SCHEMA=? AND TABLE=?");
prep.setString(1, schemaName);
prep.setString(2, tableName);
rs = prep.executeQuery();
if (rs.next()) {
String columns = rs.getString(1);
if (columns != null) {
String[] list = StringUtils.arraySplit(columns, ',', true);
for (int i = 0; i < list.length; i++) {
indexList.add(list[i]);
}
}
}
if (indexList.size() == 0) {
indexList.addAll(columnList);
}
keys = new int[keyList.size()];
setColumns(keys, keyList, columnList);
indexColumns = new int[indexList.size()];
setColumns(indexColumns, indexList, columnList);
}
private void setColumns(int[] index, ArrayList keys, ArrayList columns) throws SQLException {
for (int i = 0; i < keys.size(); i++) {
String key = (String) keys.get(i);
int found = -1;
for (int j = 0; found == -1 && j < columns.size(); j++) {
String column = (String) columns.get(j);
if (column.equals(key)) {
found = j;
}
}
if (found < 0) {
throw new SQLException("FULLTEXT", "Column not found: " + key);
}
index[i] = found;
}
}
/**
* INTERNAL
*/
public void fire(Connection conn, Object[] oldRow, Object[] newRow) throws SQLException {
if (oldRow != null) {
delete(oldRow);
}
if (newRow != null) {
insert(newRow);
}
}
private String getQuery(Object[] row) throws SQLException {
StringBuffer buff = new StringBuffer();
if (schemaName != null) {
buff.append(StringUtils.quoteIdentifier(schemaName));
buff.append(".");
}
buff.append(StringUtils.quoteIdentifier(tableName));
buff.append(" WHERE ");
for (int i = 0; i < keys.length; i++) {
if (i > 0) {
buff.append(" AND ");
}
int columnIndex = keys[i];
buff.append(StringUtils.quoteIdentifier(columnNames[columnIndex]));
Object o = row[columnIndex];
if (o == null) {
buff.append(" IS NULL");
} else {
buff.append("=");
buff.append(quoteSQL(o, dataTypes[columnIndex]));
}
}
String key = buff.toString();
return key;
}
private String quoteString(String data) {
if (data.indexOf('\'') < 0) {
return "'" + data + "'";
}
StringBuffer buff = new StringBuffer(data.length() + 2);
buff.append('\'');
for (int i = 0; i < data.length(); i++) {
char ch = data.charAt(i);
if (ch == '\'') {
buff.append(ch);
}
buff.append(ch);
}
buff.append('\'');
return buff.toString();
}
private String quoteBinary(byte[] data) {
return "'" + ByteUtils.convertBytesToString(data) + "'";
}
private String asString(Object data, int type) throws SQLException {
if (data == null) {
return "NULL";
}
switch (type) {
case Types.BIT:
case Types.BOOLEAN:
case Types.INTEGER:
case Types.BIGINT:
case Types.DECIMAL:
case Types.DOUBLE:
case Types.FLOAT:
case Types.NUMERIC:
case Types.REAL:
case Types.SMALLINT:
case Types.TINYINT:
case Types.DATE:
case Types.TIME:
case Types.TIMESTAMP:
case Types.LONGVARCHAR:
case Types.CHAR:
case Types.VARCHAR:
return data.toString();
case Types.VARBINARY:
case Types.LONGVARBINARY:
case Types.BINARY:
case Types.JAVA_OBJECT:
case Types.CLOB:
case Types.OTHER:
case Types.BLOB:
case Types.STRUCT:
case Types.REF:
case Types.NULL:
case Types.ARRAY:
case Types.DATALINK:
case Types.DISTINCT:
throw new SQLException("FULLTEXT", "Unsupported column data type: " + type);
}
return "";
}
private String quoteSQL(Object data, int type) throws SQLException {
if (data == null) {
return "NULL";
}
switch (type) {
case Types.BIT:
case Types.BOOLEAN:
case Types.INTEGER:
case Types.BIGINT:
case Types.DECIMAL:
case Types.DOUBLE:
case Types.FLOAT:
case Types.NUMERIC:
case Types.REAL:
case Types.SMALLINT:
case Types.TINYINT:
return data.toString();
case Types.DATE:
case Types.TIME:
case Types.TIMESTAMP:
case Types.LONGVARCHAR:
case Types.CHAR:
case Types.VARCHAR:
return quoteString(data.toString());
case Types.VARBINARY:
case Types.LONGVARBINARY:
case Types.BINARY:
return quoteBinary((byte[]) data);
case Types.JAVA_OBJECT:
case Types.CLOB:
case Types.OTHER:
case Types.BLOB:
case Types.STRUCT:
case Types.REF:
case Types.NULL:
case Types.ARRAY:
case Types.DATALINK:
case Types.DISTINCT:
throw new SQLException("FULLTEXT", "Unsupported key data type: " + type);
}
return "";
}
private void insert(Object[] row) throws SQLException {
String query = getQuery(row);
Document doc = new Document();
doc.add(new Field(FIELD_QUERY, query, Field.Store.YES, Field.Index.UN_TOKENIZED));
long time = System.currentTimeMillis();
doc.add(new Field("modified", DateTools.timeToString(time, DateTools.Resolution.SECOND), Field.Store.YES, Field.Index.UN_TOKENIZED));
StringBuffer allData = new StringBuffer();
for (int i = 0; i < indexColumns.length; i++) {
int index = indexColumns[i];
String columnName = columnNames[index];
String data = asString(row[index], dataTypes[index]);
doc.add(new Field(FIELD_COLUMN_PREFIX + columnName, data, Field.Store.NO, Field.Index.TOKENIZED));
if (i > 0) {
allData.append(" ");
}
allData.append(data);
}
doc.add(new Field(FIELD_DATA, allData.toString(), Field.Store.NO, Field.Index.TOKENIZED));
try {
indexer.addDocument(doc);
} catch (IOException e) {
throw convertException(e);
}
}
private void delete(Object[] row) throws SQLException {
String query = getQuery(row);
try {
Term term = new Term(FIELD_QUERY, query);
indexer.deleteDocuments(term);
} catch (IOException e) {
throw convertException(e);
}
}
private static SQLException convertException(Exception e) {
SQLException e2 = new SQLException("FULLTEXT", "Error while indexing document");
e2.initCause(e);
return e2;
}
/**
* Searches from the full text index for this database.
*
* @param conn the connection
* @param text the search query
* @param limit the maximum number of rows or 0 for no limit
* @param offset the offset or 0 for no offset
* @return the result set
*/
public static ResultSet search(Connection conn, String text, int limit, int offset) throws SQLException {
SimpleResultSet rs = new SimpleResultSet();
rs.addColumn(FIELD_QUERY, Types.VARCHAR, 0, 0);
if (text == null) {
// this is just to query the result set columns
return rs;
}
String path = getIndexPath(conn);
try {
IndexModifier indexer = getIndexModifier(conn);
indexer.flush();
IndexReader reader = IndexReader.open(path);
Analyzer analyzer = new StandardAnalyzer();
Searcher searcher = new IndexSearcher(reader);
QueryParser parser = new QueryParser(FIELD_DATA, analyzer);
Query query = parser.parse(text);
Hits hits = searcher.search(query);
int max = hits.length();
if (limit == 0) {
limit = max;
}
for (int i = 0; i < limit && i + offset < max; i++) {
Document doc = hits.doc(i + offset);
String q = doc.get(FIELD_QUERY);
rs.addRow(new Object[] { q });
}
// TODO keep it open if possible
reader.close();
} catch (Exception e) {
throw convertException(e);
}
return rs;
}
}
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