http://hsqldb.org: HSQLDB - Lightweight 100% Java SQL Database Engine
(The HSQL Development Group)
- Blaine Simpson
/* Copyright (c) 2001-2019, The HSQL Development Group
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*
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* modification, are permitted provided that the following conditions are met:
*
* Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
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* contributors may be used to endorse or promote products derived from this
* software without specific prior written permission.
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package org.hsqldb.persist;
import java.io.EOFException;
import org.hsqldb.ColumnSchema;
import org.hsqldb.Database;
import org.hsqldb.HsqlException;
import org.hsqldb.HsqlNameManager.HsqlName;
import org.hsqldb.Row;
import org.hsqldb.Session;
import org.hsqldb.Statement;
import org.hsqldb.StatementDML;
import org.hsqldb.StatementSchema;
import org.hsqldb.StatementTypes;
import org.hsqldb.Table;
import org.hsqldb.error.Error;
import org.hsqldb.error.ErrorCode;
import org.hsqldb.lib.IntKeyHashMap;
import org.hsqldb.map.ValuePool;
import org.hsqldb.result.Result;
import org.hsqldb.scriptio.ScriptReaderBase;
import org.hsqldb.scriptio.ScriptReaderDecode;
import org.hsqldb.scriptio.ScriptReaderText;
import org.hsqldb.scriptio.StatementLineTypes;
import org.hsqldb.types.Type;
Restores the state of a Database instance from an SQL log file.
If there is an error, processing stops at that line and the message is
logged to the application log. If memory runs out, an exception is thrown.
Author: Fred Toussi (fredt@users dot sourceforge.net) Version: 2.5.0 Since: 1.7.2
/**
* Restores the state of a Database instance from an SQL log file. <p>
*
* If there is an error, processing stops at that line and the message is
* logged to the application log. If memory runs out, an exception is thrown.
*
* @author Fred Toussi (fredt@users dot sourceforge.net)
* @version 2.5.0
* @since 1.7.2
*/
public class ScriptRunner {
This is used to read the *.log file and manage any necessary
transaction rollback.
/**
* This is used to read the *.log file and manage any necessary
* transaction rollback.
*/
public static void runScript(Database database, String logFilename,
boolean fullReplay) {
Crypto crypto = database.logger.getCrypto();
ScriptReaderBase scr;
try {
if (crypto == null) {
scr = new ScriptReaderText(database, logFilename, false);
} else {
scr = new ScriptReaderDecode(database, logFilename, crypto,
true);
}
} catch (Throwable e) {
// catch out-of-memory errors and terminate
if (e instanceof EOFException) {
// end of file - normal end
} else {
// stop processing on bad script line
database.logger.logSevereEvent("opening log file", e);
}
return;
}
runScript(database, scr, fullReplay);
}
private static void runScript(Database database, ScriptReaderBase scr,
boolean fullReplay) {
IntKeyHashMap sessionMap = new IntKeyHashMap();
Session current = null;
int currentId = 0;
String statement;
int statementType;
Statement dummy = new StatementDML(StatementTypes.UPDATE_CURSOR,
StatementTypes.X_SQL_DATA_CHANGE,
null);
String databaseFile = database.getCanonicalPath();
String action = fullReplay ? "open aborted"
: "open continued";
dummy.setCompileTimestamp(Long.MAX_VALUE);
database.setReferentialIntegrity(false);
try {
while (scr.readLoggedStatement(current)) {
int sessionId = scr.getSessionNumber();
if (current == null || currentId != sessionId) {
currentId = sessionId;
current = (Session) sessionMap.get(currentId);
if (current == null) {
// note the sessionId does not match the sessionId of
// new session
current =
database.getSessionManager().newSessionForLog(
database);
sessionMap.put(currentId, current);
}
}
Result result = null;
statementType = scr.getStatementType();
switch (statementType) {
case StatementLineTypes.SET_FILES_CHECK_STATEMENT :
result = null;
// fall through
case StatementLineTypes.ANY_STATEMENT :
statement = scr.getLoggedStatement();
Statement cs;
try {
cs = current.compileStatement(statement);
if (database.getProperties().isVersion18()) {
// convert BIT columns in .log to BOOLEAN
if (cs.getType()
== StatementTypes.CREATE_TABLE) {
Table table =
(Table) ((StatementSchema) cs)
.getArguments()[0];
for (int i = 0; i < table.getColumnCount();
i++) {
ColumnSchema column =
table.getColumn(i);
if (column.getDataType().isBitType()) {
column.setType(Type.SQL_BOOLEAN);
}
}
}
}
result = current.executeCompiledStatement(cs,
ValuePool.emptyObjectArray, 0);
} catch (Throwable e) {
result = Result.newErrorResult(e);
}
if (result != null && result.isError()) {
if (result.getException() != null) {
throw result.getException();
}
throw Error.error(result);
}
break;
case StatementLineTypes.COMMIT_STATEMENT :
current.commit(false);
break;
case StatementLineTypes.INSERT_STATEMENT : {
current.sessionContext.currentStatement = dummy;
current.beginAction(dummy);
Object[] data = scr.getData();
scr.getCurrentTable().insertNoCheckFromLog(current,
data);
current.endAction(Result.updateOneResult);
break;
}
case StatementLineTypes.DELETE_STATEMENT : {
current.sessionContext.currentStatement = dummy;
current.beginAction(dummy);
Table table = scr.getCurrentTable();
PersistentStore store = table.getRowStore(current);
Object[] data = scr.getData();
Row row = table.getDeleteRowFromLog(current, data);
if (row != null) {
current.addDeleteAction(table, store, row, null);
}
current.endAction(Result.updateOneResult);
break;
}
case StatementLineTypes.SET_SCHEMA_STATEMENT : {
HsqlName name =
database.schemaManager.findSchemaHsqlName(
scr.getCurrentSchema());
current.setCurrentSchemaHsqlName(name);
break;
}
case StatementLineTypes.SESSION_ID : {
break;
}
default :
throw Error.error(ErrorCode.ERROR_IN_LOG_FILE);
}
if (current.isClosed()) {
current = null;
sessionMap.remove(currentId);
}
}
} catch (HsqlException e) {
if (e.getErrorCode() == -ErrorCode.ERROR_IN_LOG_FILE) {
throw e;
}
// stop processing on bad log line
String error = "statement error processing log - " + action + " "
+ scr.getFileNamePath() + " line: "
+ scr.getLineNumber();
database.logger.logSevereEvent(error, e);
if (fullReplay) {
throw Error.error(e, ErrorCode.ERROR_IN_LOG_FILE, error);
}
} catch (OutOfMemoryError e) {
String error = "out of memory processing log - " + databaseFile
+ " line: " + scr.getLineNumber();
// catch out-of-memory errors and terminate
database.logger.logSevereEvent(error, e);
throw Error.error(ErrorCode.OUT_OF_MEMORY);
} catch (Throwable t) {
HsqlException e =
Error.error(t, ErrorCode.ERROR_IN_LOG_FILE,
ErrorCode.M_DatabaseScriptReader_read,
new String[] {
scr.getLineNumber() + " " + databaseFile, t.getMessage()
});
// stop processing on bad script line
String error = "statement error processing log - " + action
+ scr.getFileNamePath() + " line: "
+ scr.getLineNumber();
database.logger.logSevereEvent(error, e);
if (fullReplay) {
throw e;
}
} finally {
if (scr != null) {
scr.close();
}
database.getSessionManager().closeAllSessions();
database.setReferentialIntegrity(true);
}
}
}