HSQLDB example source code file (Session.java)
The HSQLDB Session.java source code/*
* For work developed by the HSQL Development Group:
*
* Copyright (c) 2001-2010, The HSQL Development Group
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* 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.
*
* Neither the name of the HSQL Development Group nor the names of its
* contributors may be used to endorse or promote products derived from this
* software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL HSQL DEVELOPMENT GROUP, HSQLDB.ORG,
* OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*
*
* For work originally developed by the Hypersonic SQL Group:
*
* Copyright (c) 1995-2000, The Hypersonic SQL Group.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* 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.
*
* Neither the name of the Hypersonic SQL Group nor the names of its
* contributors may be used to endorse or promote products derived from this
* software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE HYPERSONIC SQL GROUP,
* OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* This software consists of voluntary contributions made by many individuals
* on behalf of the Hypersonic SQL Group.
*/
package org.hsqldb;
import java.sql.Date;
import java.sql.Time;
import java.sql.Timestamp;
import org.hsqldb.HsqlNameManager.HsqlName;
import org.hsqldb.jdbc.jdbcConnection;
import org.hsqldb.lib.ArrayUtil;
import org.hsqldb.lib.HashMappedList;
import org.hsqldb.lib.HsqlArrayList;
import org.hsqldb.lib.IntKeyHashMap;
import org.hsqldb.lib.SimpleLog;
import org.hsqldb.lib.java.JavaSystem;
import org.hsqldb.store.ValuePool;
// fredt@users 20020320 - doc 1.7.0 - update
// fredt@users 20020315 - patch 1.7.0 - switch for scripting
// fredt@users 20020130 - patch 476694 by velichko - transaction savepoints
// additions in different parts to support savepoint transactions
// fredt@users 20020910 - patch 1.7.1 by fredt - database readonly enforcement
// fredt@users 20020912 - patch 1.7.1 by fredt - permanent internal connection
// boucherb@users 20030512 - patch 1.7.2 - compiled statements
// - session becomes execution hub
// boucherb@users 20050510 - patch 1.7.2 - generalized Result packet passing
// based command execution
// - batch execution handling
// fredt@users 20030628 - patch 1.7.2 - session proxy support
// fredt@users 20040509 - patch 1.7.2 - SQL conformance for CURRENT_TIMESTAMP and other datetime functions
/**
* Implementation of a user session with the database. In 1.7.2 Session
* becomes the public interface to an HSQLDB database, accessed locally or
* remotely via SessionInterface.
*
* When as Session is closed, all references to internal engine objects are
* set to null. But the session id and scripting mode may still be used for
* scripting
*
* New class based based on original Hypersonic code.
* Extensively rewritten and extended in successive versions of HSQLDB.
*
* @author Thomas Mueller (Hypersonic SQL Group)
* @version 1.8.0
* @since 1.7.0
*/
public class Session implements SessionInterface {
//
private volatile boolean isAutoCommit;
private volatile boolean isReadOnly;
private volatile boolean isClosed;
//
Database database;
private User user;
HsqlArrayList rowActionList;
private boolean isNestedTransaction;
private int nestedOldTransIndex;
int isolationMode = SessionInterface.TX_READ_COMMITTED;
long actionTimestamp;
long transactionTimestamp;
private int currentMaxRows;
private int sessionMaxRows;
private Number lastIdentity = ValuePool.getInt(0);
private final int sessionId;
HashMappedList savepoints;
private boolean script;
private Tokenizer tokenizer;
private Parser parser;
static final Result emptyUpdateCount =
new Result(ResultConstants.UPDATECOUNT);
//
private jdbcConnection intConnection;
// schema
public HsqlName currentSchema;
public HsqlName loggedSchema;
private HsqlName oldSchema;
// query processing
boolean isProcessingScript;
boolean isProcessingLog;
// two types of temp tables
private IntKeyHashMap indexArrayMap;
private IntKeyHashMap indexArrayKeepMap;
/** @todo fredt - clarify in which circumstances Session has to disconnect */
Session getSession() {
return this;
}
/**
* Constructs a new Session object.
*
* @param db the database to which this represents a connection
* @param user the initial user
* @param autocommit the initial autocommit value
* @param readonly the initial readonly value
* @param id the session identifier, as known to the database
*/
Session(Database db, User user, boolean autocommit, boolean readonly,
int id) {
sessionId = id;
database = db;
this.user = user;
rowActionList = new HsqlArrayList(true);
savepoints = new HashMappedList(4);
isAutoCommit = autocommit;
isReadOnly = readonly;
dbCommandInterpreter = new DatabaseCommandInterpreter(this);
compiledStatementExecutor = new CompiledStatementExecutor(this);
compiledStatementManager = db.compiledStatementManager;
tokenizer = new Tokenizer();
parser = new Parser(this, database, tokenizer);
resetSchema();
}
void resetSchema() {
HsqlName initialSchema = user.getInitialSchema();
currentSchema = ((initialSchema == null)
? database.schemaManager.getDefaultSchemaHsqlName()
: initialSchema);
}
/**
* Retrieves the session identifier for this Session.
*
* @return the session identifier for this Session
*/
public int getId() {
return sessionId;
}
/**
* Closes this Session.
*/
public void close() {
if (isClosed) {
return;
}
synchronized (database) {
// test again inside block
if (isClosed) {
return;
}
database.sessionManager.removeSession(this);
rollback();
try {
database.logger.writeToLog(this, Token.T_DISCONNECT);
} catch (HsqlException e) {}
clearIndexRoots();
clearIndexRootsKeep();
compiledStatementManager.removeSession(sessionId);
database.closeIfLast();
database = null;
user = null;
rowActionList = null;
savepoints = null;
intConnection = null;
compiledStatementExecutor = null;
compiledStatementManager = null;
dbCommandInterpreter = null;
lastIdentity = null;
isClosed = true;
}
}
/**
* Retrieves whether this Session is closed.
*
* @return true if this Session is closed
*/
public boolean isClosed() {
return isClosed;
}
public void setIsolation(int level) throws HsqlException {
isolationMode = level;
}
public int getIsolation() throws HsqlException {
return isolationMode;
}
/**
* Setter for iLastIdentity attribute.
*
* @param i the new value
*/
void setLastIdentity(Number i) {
lastIdentity = i;
}
/**
* Getter for iLastIdentity attribute.
*
* @return the current value
*/
Number getLastIdentity() {
return lastIdentity;
}
/**
* Retrieves the Database instance to which this
* Session represents a connection.
*
* @return the Database object to which this Session is connected
*/
Database getDatabase() {
return database;
}
/**
* Retrieves the name, as known to the database, of the
* user currently controlling this Session.
*
* @return the name of the user currently connected within this Session
*/
String getUsername() {
return user.getName();
}
/**
* Retrieves the User object representing the user currently controlling
* this Session.
*
* @return this Session's User object
*/
public User getUser() {
return user;
}
/**
* Sets this Session's User object to the one specified by the
* user argument.
*
* @param user the new User object for this session
*/
void setUser(User user) {
this.user = user;
}
int getMaxRows() {
return currentMaxRows;
}
int getSQLMaxRows() {
return sessionMaxRows;
}
/**
* The SQL command SET MAXROWS n will override the Statement.setMaxRows(n)
* until SET MAXROWS 0 is issued.
*
* NB this is dedicated to the SET MAXROWS sql statement and should not
* otherwise be called. (fredt@users)
*/
void setSQLMaxRows(int rows) {
currentMaxRows = sessionMaxRows = rows;
}
/**
* Checks whether this Session's current User has the privileges of
* the ADMIN role.
*
* @throws HsqlException if this Session's User does not have the
* privileges of the ADMIN role.
*/
void checkAdmin() throws HsqlException {
user.checkAdmin();
}
/**
* Checks whether this Session's current User has the set of rights
* specified by the right argument, in relation to the database
* object identifier specified by the object argument.
*
* @param object the database object to check
* @param right the rights to check for
* @throws HsqlException if the Session User does not have such rights
*/
void check(HsqlName object, int right) throws HsqlException {
user.check(object, right);
}
/**
* Checks the rights on a function
*
* @param object the function
* @throws HsqlException if the Session User does not have such rights
*/
void check(String object) throws HsqlException {
user.check(object);
}
/**
* This is used for reading - writing to existing tables.
* @throws HsqlException
*/
void checkReadWrite() throws HsqlException {
if (isReadOnly) {
throw Trace.error(Trace.DATABASE_IS_READONLY);
}
}
/**
* This is used for creating new database objects such as tables.
* @throws HsqlException
*/
void checkDDLWrite() throws HsqlException {
if (database.isFilesReadOnly() && !user.isSys()) {
throw Trace.error(Trace.DATABASE_IS_READONLY);
}
checkReadWrite();
}
/**
* Adds a single-row deletion step to the transaction UNDO buffer.
*
* @param table the table from which the row was deleted
* @param row the deleted row
* @throws HsqlException
*/
boolean addDeleteAction(Table table, Row row) throws HsqlException {
if (!isAutoCommit || isNestedTransaction) {
Transaction t = new Transaction(true, table, row, actionTimestamp);
rowActionList.add(t);
database.txManager.addTransaction(this, t);
return true;
} else {
table.removeRowFromStore(row);
}
return false;
}
/**
* Adds a single-row insertion step to the transaction UNDO buffer.
*
* @param table the table into which the row was inserted
* @param row the inserted row
* @throws HsqlException
*/
boolean addInsertAction(Table table, Row row) throws HsqlException {
if (!isAutoCommit || isNestedTransaction) {
Transaction t = new Transaction(false, table, row,
actionTimestamp);
rowActionList.add(t);
database.txManager.addTransaction(this, t);
return true;
} else {
table.commitRowToStore(row);
}
return false;
}
/**
* Setter for the autocommit attribute.
*
* @param autocommit the new value
* @throws HsqlException
*/
public void setAutoCommit(boolean autocommit) {
if (isClosed) {
return;
}
synchronized (database) {
if (autocommit != isAutoCommit) {
commit();
isAutoCommit = autocommit;
try {
database.logger.writeToLog(this, getAutoCommitStatement());
} catch (HsqlException e) {}
}
}
}
public void startPhasedTransaction() throws HsqlException {}
public void prepareCommit() throws HsqlException {}
/**
* Commits any uncommited transaction this Session may have open
*
* @throws HsqlException
*/
public void commit() {
if (isClosed) {
return;
}
synchronized (database) {
if (!rowActionList.isEmpty()) {
try {
database.logger.writeCommitStatement(this);
} catch (HsqlException e) {}
}
database.txManager.commit(this);
clearIndexRoots();
}
}
/**
* Rolls back any uncommited transaction this Session may have open.
*
* @throws HsqlException
*/
public void rollback() {
if (isClosed) {
return;
}
synchronized (database) {
if (rowActionList.size() != 0) {
try {
database.logger.writeToLog(this, Token.T_ROLLBACK);
} catch (HsqlException e) {}
}
database.txManager.rollback(this);
clearIndexRoots();
}
}
/**
* No-op in this implementation
*/
public void resetSession() throws HsqlException {
throw new HsqlException("", "", 0);
}
/**
* Implements a transaction SAVEPOINT. A new SAVEPOINT with the
* name of an existing one replaces the old SAVEPOINT.
*
* @param name of the savepoint
* @throws HsqlException if there is no current transaction
*/
void savepoint(String name) throws HsqlException {
savepoints.remove(name);
savepoints.add(name, ValuePool.getInt(rowActionList.size()));
try {
database.logger.writeToLog(this, Token.T_SAVEPOINT + " " + name);
} catch (HsqlException e) {}
}
/**
* Implements a partial transaction ROLLBACK.
*
* @param name Name of savepoint that was marked before by savepoint()
* call
* @throws HsqlException
*/
void rollbackToSavepoint(String name) throws HsqlException {
if (isClosed) {
return;
}
try {
database.logger.writeToLog(this,
Token.T_ROLLBACK + " " + Token.T_TO
+ " " + Token.T_SAVEPOINT + " " + name);
} catch (HsqlException e) {}
database.txManager.rollbackSavepoint(this, name);
}
/**
* Implements release of named SAVEPOINT.
*
* @param name Name of savepoint that was marked before by savepoint()
* call
* @throws HsqlException if name does not correspond to a savepoint
*/
void releaseSavepoint(String name) throws HsqlException {
// remove this and all later savepoints
int index = savepoints.getIndex(name);
Trace.check(index >= 0, Trace.SAVEPOINT_NOT_FOUND, name);
while (savepoints.size() > index) {
savepoints.remove(savepoints.size() - 1);
}
}
/**
* Starts a nested transaction.
*
* @throws HsqlException
*/
void beginNestedTransaction() throws HsqlException {
if (isNestedTransaction) {
Trace.doAssert(false, "beginNestedTransaction");
}
nestedOldTransIndex = rowActionList.size();
isNestedTransaction = true;
if (isAutoCommit) {
try {
database.logger.writeToLog(this, "SET AUTOCOMMIT FALSE");
} catch (HsqlException e) {}
}
}
/**
* @todo -- fredt 20050604 - if this method is called after an out of memory
* error during update, the next block might throw out of memory too and as
* a result inNestedTransaction remains true and no further update
* is possible. The session must be closed at that point by the user
* application.
*/
/**
* Ends a nested transaction.
*
* @param rollback true to roll back or false to commit the nested transaction
* @throws HsqlException
*/
void endNestedTransaction(boolean rollback) throws HsqlException {
if (!isNestedTransaction) {
Trace.doAssert(false, "endNestedTransaction");
}
if (rollback) {
database.txManager.rollbackTransactions(this, nestedOldTransIndex,
true);
}
// reset after the rollback
isNestedTransaction = false;
if (isAutoCommit) {
database.txManager.commit(this);
try {
database.logger.writeToLog(this, "SET AUTOCOMMIT TRUE");
} catch (HsqlException e) {}
}
}
/**
* Setter for readonly attribute.
*
* @param readonly the new value
*/
public void setReadOnly(boolean readonly) throws HsqlException {
if (!readonly && database.databaseReadOnly) {
throw Trace.error(Trace.DATABASE_IS_READONLY);
}
isReadOnly = readonly;
}
/**
* Getter for readonly attribute.
*
* @return the current value
*/
public boolean isReadOnly() {
return isReadOnly;
}
/**
* Getter for nestedTransaction attribute.
*
* @return the current value
*/
boolean isNestedTransaction() {
return isNestedTransaction;
}
/**
* Getter for autoCommit attribute.
*
* @return the current value
*/
public boolean isAutoCommit() {
return isAutoCommit;
}
/**
* A switch to set scripting on the basis of type of statement executed.
* A method in DatabaseCommandInterpreter.java sets this value to false
* before other methods are called to act on an SQL statement, which may
* set this to true. Afterwards the method reponsible for logging uses
* getScripting() to determine if logging is required for the executed
* statement. (fredt@users)
*
* @param script The new scripting value
*/
void setScripting(boolean script) {
this.script = script;
}
/**
* Getter for scripting attribute.
*
* @return scripting for the last statement.
*/
boolean getScripting() {
return script;
}
public String getAutoCommitStatement() {
return isAutoCommit ? "SET AUTOCOMMIT TRUE"
: "SET AUTOCOMMIT FALSE";
}
/**
* Retrieves an internal Connection object equivalent to the one
* that created this Session.
*
* @return internal connection.
*/
jdbcConnection getInternalConnection() throws HsqlException {
if (intConnection == null) {
intConnection = new jdbcConnection(this);
}
return intConnection;
}
// boucherb@users 20020810 metadata 1.7.2
//----------------------------------------------------------------
private final long connectTime = System.currentTimeMillis();
// more effecient for MetaData concerns than checkAdmin
/**
* Getter for admin attribute.
*
* @ return the current value
*/
boolean isAdmin() {
return user.isAdmin();
}
/**
* Getter for connectTime attribute.
*
* @return the value
*/
long getConnectTime() {
return connectTime;
}
/**
* Getter for transactionSise attribute.
*
* @return the current value
*/
int getTransactionSize() {
return rowActionList.size();
}
/**
* Retrieves whether the database object identifier by the dbobject
* argument is accessible by the current Session User.
*
* @return true if so, else false
*/
boolean isAccessible(String dbobject) throws HsqlException {
return user.isAccessible(dbobject);
}
boolean isAccessible(HsqlName dbobject) throws HsqlException {
return user.isAccessible(dbobject);
}
// boucherb@users 20030417 - patch 1.7.2 - compiled statement support
//-------------------------------------------------------------------
DatabaseCommandInterpreter dbCommandInterpreter;
CompiledStatementExecutor compiledStatementExecutor;
CompiledStatementManager compiledStatementManager;
CompiledStatement sqlCompileStatement(String sql) throws HsqlException {
parser.reset(sql);
CompiledStatement cs;
int brackets = 0;
String token = tokenizer.getString();
int cmd = Token.get(token);
switch (cmd) {
case Token.OPENBRACKET : {
brackets = parser.parseOpenBracketsSelect() + 1;
}
case Token.SELECT : {
cs = parser.compileSelectStatement(brackets);
break;
}
case Token.INSERT : {
cs = parser.compileInsertStatement();
break;
}
case Token.UPDATE : {
cs = parser.compileUpdateStatement();
break;
}
case Token.DELETE : {
cs = parser.compileDeleteStatement();
break;
}
case Token.CALL : {
cs = parser.compileCallStatement();
break;
}
default : {
// DDL statements
cs = new CompiledStatement(currentSchema);
break;
}
}
// In addition to requiring that the compilation was successful,
// we also require that the submitted sql represents a _single_
// valid DML or DDL statement. We do not check the DDL yet.
// fredt - now accepts semicolon and whitespace at the end of statement
// fredt - investigate if it should or not for prepared statements
if (cs.type != CompiledStatement.DDL) {
while (tokenizer.getPosition() < tokenizer.getLength()) {
token = tokenizer.getString();
if (token.length() != 0 && !token.equals(Token.T_SEMICOLON)) {
throw Trace.error(Trace.UNEXPECTED_TOKEN, token);
}
}
}
// - need to be able to key cs against its sql in statement pool
// - also need to be able to revalidate its sql occasionally
cs.sql = sql;
return cs;
}
/**
* Executes the command encapsulated by the cmd argument.
*
* @param cmd the command to execute
* @return the result of executing the command
*/
public Result execute(Result cmd) {
try {
if (isClosed) {
Trace.check(false, Trace.ACCESS_IS_DENIED,
Trace.getMessage(Trace.Session_execute));
}
} catch (Throwable t) {
return new Result(t, null);
}
synchronized (database) {
int type = cmd.mode;
if (sessionMaxRows == 0) {
currentMaxRows = cmd.updateCount;
}
// we simply get the next system change number - no matter what type of query
actionTimestamp = database.txManager.nextActionTimestamp();
JavaSystem.gc();
switch (type) {
case ResultConstants.SQLEXECUTE : {
Result resultout = sqlExecute(cmd);
resultout = performPostExecute(resultout);
return resultout;
}
case ResultConstants.BATCHEXECUTE : {
Result resultout = sqlExecuteBatch(cmd);
resultout = performPostExecute(resultout);
return resultout;
}
case ResultConstants.SQLEXECDIRECT : {
Result resultout =
sqlExecuteDirectNoPreChecks(cmd.getMainString());
resultout = performPostExecute(resultout);
return resultout;
}
case ResultConstants.BATCHEXECDIRECT : {
Result resultout = sqlExecuteBatchDirect(cmd);
resultout = performPostExecute(resultout);
return resultout;
}
case ResultConstants.SQLPREPARE : {
CompiledStatement cs;
try {
cs = compiledStatementManager.compile(
this, cmd.getMainString());
} catch (Throwable t) {
return new Result(t, cmd.getMainString());
}
Result rmd = cs.describeResult();
Result pmd = cs.describeParameters();
return Result.newPrepareResponse(cs.id, rmd, pmd);
}
case ResultConstants.SQLFREESTMT : {
compiledStatementManager.freeStatement(
cmd.getStatementID(), sessionId, false);
return emptyUpdateCount;
}
case ResultConstants.GETSESSIONATTR : {
return getAttributes();
}
case ResultConstants.SETSESSIONATTR : {
return setAttributes(cmd);
}
case ResultConstants.SQLENDTRAN : {
switch (cmd.getEndTranType()) {
case ResultConstants.COMMIT :
commit();
break;
case ResultConstants.ROLLBACK :
rollback();
break;
case ResultConstants.SAVEPOINT_NAME_RELEASE :
try {
String name = cmd.getMainString();
releaseSavepoint(name);
} catch (Throwable t) {
return new Result(t, null);
}
break;
case ResultConstants.SAVEPOINT_NAME_ROLLBACK :
try {
rollbackToSavepoint(cmd.getMainString());
} catch (Throwable t) {
return new Result(t, null);
}
break;
// not yet
// case ResultConstants.COMMIT_AND_CHAIN :
// case ResultConstants.ROLLBACK_AND_CHAIN :
}
return emptyUpdateCount;
}
case ResultConstants.SQLSETCONNECTATTR : {
switch (cmd.getConnectionAttrType()) {
case ResultConstants.SQL_ATTR_SAVEPOINT_NAME :
try {
savepoint(cmd.getMainString());
} catch (Throwable t) {
return new Result(t, null);
}
// case ResultConstants.SQL_ATTR_AUTO_IPD
// - always true
// default: throw - case never happens
}
return emptyUpdateCount;
}
case ResultConstants.SQLDISCONNECT : {
close();
return emptyUpdateCount;
}
default : {
return new Result(
Trace.runtimeError(
Trace.UNSUPPORTED_INTERNAL_OPERATION,
"Session.execute()"), null);
}
}
}
}
private Result performPostExecute(Result r) {
try {
if (database != null) {
database.schemaManager.logSequences(this, database.logger);
if (isAutoCommit) {
clearIndexRoots();
database.logger.synchLog();
}
}
return r;
} catch (Exception e) {
return new Result(e, null);
} finally {
if (database != null && database.logger.needsCheckpoint()) {
try {
database.logger.checkpoint(false);
} catch (HsqlException e) {
database.logger.appLog.logContext(
SimpleLog.LOG_ERROR, "checkpoint did not complete");
}
}
}
}
public Result sqlExecuteDirectNoPreChecks(String sql) {
synchronized (database) {
return dbCommandInterpreter.execute(sql);
}
}
Result sqlExecuteCompiledNoPreChecks(CompiledStatement cs,
Object[] pvals) {
return compiledStatementExecutor.execute(cs, pvals);
}
private Result sqlExecuteBatch(Result cmd) {
int csid;
Record record;
Result out;
CompiledStatement cs;
Expression[] parameters;
int[] updateCounts;
int count;
csid = cmd.getStatementID();
cs = database.compiledStatementManager.getStatement(this, csid);
if (cs == null) {
// invalid sql has been removed already
return new Result(
Trace.runtimeError(Trace.INVALID_PREPARED_STATEMENT, null),
null);
}
parameters = cs.parameters;
count = 0;
updateCounts = new int[cmd.getSize()];
record = cmd.rRoot;
while (record != null) {
Result in;
Object[] pvals = record.data;
in = sqlExecuteCompiledNoPreChecks(cs, pvals);
// On the client side, iterate over the vals and throw
// a BatchUpdateException if a batch status value of
// esultConstants.EXECUTE_FAILED is encountered in the result
if (in.mode == ResultConstants.UPDATECOUNT) {
updateCounts[count++] = in.updateCount;
} else if (in.isData()) {
// FIXME: we don't have what it takes yet
// to differentiate between things like
// stored procedure calls to methods with
// void return type and select statements with
// a single row/column containg null
updateCounts[count++] = ResultConstants.SUCCESS_NO_INFO;
} else {
updateCounts = ArrayUtil.arraySlice(updateCounts, 0, count);
break;
}
record = record.next;
}
out = new Result(ResultConstants.SQLEXECUTE, updateCounts, 0);
return out;
}
private Result sqlExecuteBatchDirect(Result cmd) {
Record record;
Result out;
int[] updateCounts;
int count;
count = 0;
updateCounts = new int[cmd.getSize()];
record = cmd.rRoot;
while (record != null) {
Result in;
String sql = (String) record.data[0];
try {
in = dbCommandInterpreter.execute(sql);
} catch (Throwable t) {
in = new Result(ResultConstants.ERROR);
// if (t instanceof OutOfMemoryError) {
// System.gc();
// }
// "in" alread equals "err"
// maybe test for OOME and do a gc() ?
// t.printStackTrace();
}
// On the client side, iterate over the colType vals and throw
// a BatchUpdateException if a batch status value of
// ResultConstants.EXECUTE_FAILED is encountered
if (in.mode == ResultConstants.UPDATECOUNT) {
updateCounts[count++] = in.updateCount;
} else if (in.isData()) {
// FIXME: we don't have what it takes yet
// to differentiate between things like
// stored procedure calls to methods with
// void return type and select statements with
// a single row/column containg null
updateCounts[count++] = ResultConstants.SUCCESS_NO_INFO;
} else {
updateCounts = ArrayUtil.arraySlice(updateCounts, 0, count);
break;
}
record = record.next;
}
out = new Result(ResultConstants.SQLEXECUTE, updateCounts, 0);
return out;
}
/**
* Retrieves the result of executing the prepared statement whose csid
* and parameter values/types are encapsulated by the cmd argument.
*
* @return the result of executing the statement
*/
private Result sqlExecute(Result cmd) {
int csid = cmd.getStatementID();
CompiledStatement cs = compiledStatementManager.getStatement(this,
csid);
if (cs == null) {
// invalid sql has been removed already
return new Result(
Trace.runtimeError(Trace.INVALID_PREPARED_STATEMENT, null),
null);
}
Object[] pvals = cmd.getParameterData();
return sqlExecute(cs, pvals);
}
private Result sqlExecute(CompiledStatement cs, Object[] pvals) {
return sqlExecuteCompiledNoPreChecks(cs, pvals);
}
// session DATETIME functions
long currentDateTimeSCN;
long currentMillis;
Date currentDate;
Time currentTime;
Timestamp currentTimestamp;
/**
* Returns the current date, unchanged for the duration of the current
* execution unit (statement).<p>
*
* SQL standards require that CURRENT_DATE, CURRENT_TIME and
* CURRENT_TIMESTAMP are all evaluated at the same point of
* time in the duration of each SQL statement, no matter how long the
* SQL statement takes to complete.<p>
*
* When this method or a corresponding method for CURRENT_TIME or
* CURRENT_TIMESTAMP is first called in the scope of a system change
* number, currentMillis is set to the current system time. All further
* CURRENT_XXXX calls in this scope will use this millisecond value.
* (fredt@users)
*/
Date getCurrentDate() {
if (currentDateTimeSCN != actionTimestamp) {
currentDateTimeSCN = actionTimestamp;
currentMillis = System.currentTimeMillis();
currentDate = HsqlDateTime.getCurrentDate(currentMillis);
currentTime = null;
currentTimestamp = null;
} else if (currentDate == null) {
currentDate = HsqlDateTime.getCurrentDate(currentMillis);
}
return currentDate;
}
/**
* Returns the current time, unchanged for the duration of the current
* execution unit (statement)
*/
Time getCurrentTime() {
if (currentDateTimeSCN != actionTimestamp) {
currentDateTimeSCN = actionTimestamp;
currentMillis = System.currentTimeMillis();
currentDate = null;
currentTime =
new Time(HsqlDateTime.getNormalisedTime(currentMillis));
currentTimestamp = null;
} else if (currentTime == null) {
currentTime =
new Time(HsqlDateTime.getNormalisedTime(currentMillis));
}
return currentTime;
}
/**
* Returns the current timestamp, unchanged for the duration of the current
* execution unit (statement)
*/
Timestamp getCurrentTimestamp() {
if (currentDateTimeSCN != actionTimestamp) {
currentDateTimeSCN = actionTimestamp;
currentMillis = System.currentTimeMillis();
currentDate = null;
currentTime = null;
currentTimestamp = HsqlDateTime.getTimestamp(currentMillis);
} else if (currentTimestamp == null) {
currentTimestamp = HsqlDateTime.getTimestamp(currentMillis);
}
return currentTimestamp;
}
Result getAttributes() {
Result r = Result.newSessionAttributesResult();
Object[] row = new Object[] {
database.getURI(), getUsername(), ValuePool.getInt(sessionId),
ValuePool.getInt(isolationMode),
ValuePool.getBoolean(isAutoCommit),
ValuePool.getBoolean(database.databaseReadOnly),
ValuePool.getBoolean(isReadOnly)
};
r.add(row);
return r;
}
Result setAttributes(Result r) {
Object[] row = r.rRoot.data;
for (int i = 0; i < row.length; i++) {
Object value = row[i];
if (value == null) {
continue;
}
try {
switch (i) {
case SessionInterface.INFO_AUTOCOMMIT : {
this.setAutoCommit(((Boolean) value).booleanValue());
break;
}
case SessionInterface.INFO_CONNECTION_READONLY :
this.setReadOnly(((Boolean) value).booleanValue());
break;
}
} catch (HsqlException e) {
return new Result(e, null);
}
}
return emptyUpdateCount;
}
// DatabaseMetaData.getURL should work as specified for
// internal connections too.
public String getInternalConnectionURL() {
return DatabaseURL.S_URL_PREFIX + database.getURI();
}
boolean isProcessingScript() {
return isProcessingScript;
}
boolean isProcessingLog() {
return isProcessingLog;
}
boolean isSchemaDefintion() {
return oldSchema != null;
}
void startSchemaDefinition(String schema) throws HsqlException {
if (isProcessingScript) {
setSchema(schema);
return;
}
oldSchema = currentSchema;
setSchema(schema);
}
void endSchemaDefinition() throws HsqlException {
if (oldSchema == null) {
return;
}
currentSchema = oldSchema;
oldSchema = null;
database.logger.writeToLog(this,
"SET SCHEMA "
+ currentSchema.statementName);
}
// schema object methods
public void setSchema(String schema) throws HsqlException {
currentSchema = database.schemaManager.getSchemaHsqlName(schema);
}
/**
* If schemaName is null, return the current schema name, else return
* the HsqlName object for the schema. If schemaName does not exist,
* throw.
*/
HsqlName getSchemaHsqlName(String name) throws HsqlException {
return name == null ? currentSchema
: database.schemaManager.getSchemaHsqlName(name);
}
/**
* Same as above, but return string
*/
public String getSchemaName(String name) throws HsqlException {
return name == null ? currentSchema.name
: database.schemaManager.getSchemaName(name);
}
/**
* If schemaName is null, return the current schema name, else return
* the HsqlName object for the schema. If schemaName does not exist, or
* schema readonly, throw.
*/
HsqlName getSchemaHsqlNameForWrite(String name) throws HsqlException {
HsqlName schema = getSchemaHsqlName(name);
if (database.schemaManager.isSystemSchema(schema)) {
throw Trace.error(Trace.INVALID_SCHEMA_NAME_NO_SUBCLASS);
}
return schema;
}
/**
* Same as above, but return string
*/
public String getSchemaNameForWrite(String name) throws HsqlException {
HsqlName schema = getSchemaHsqlNameForWrite(name);
return schema.name;
}
/**
* get the root for a temp table index
*/
Node getIndexRoot(HsqlName index, boolean preserve) {
if (preserve) {
if (indexArrayKeepMap == null) {
return null;
}
return (Node) indexArrayKeepMap.get(index.hashCode());
} else {
if (indexArrayMap == null) {
return null;
}
return (Node) indexArrayMap.get(index.hashCode());
}
}
/**
* set the root for a temp table index
*/
void setIndexRoot(HsqlName index, boolean preserve, Node root) {
if (preserve) {
if (indexArrayKeepMap == null) {
if (root == null) {
return;
}
indexArrayKeepMap = new IntKeyHashMap();
}
indexArrayKeepMap.put(index.hashCode(), root);
} else {
if (indexArrayMap == null) {
if (root == null) {
return;
}
indexArrayMap = new IntKeyHashMap();
}
indexArrayMap.put(index.hashCode(), root);
}
}
void dropIndex(HsqlName index, boolean preserve) {
if (preserve) {
if (indexArrayKeepMap != null) {
indexArrayKeepMap.remove(index.hashCode());
}
} else {
if (indexArrayMap != null) {
indexArrayMap.remove(index.hashCode());
}
}
}
/**
* clear default temp table contents for this session
*/
void clearIndexRoots() {
if (indexArrayMap != null) {
indexArrayMap.clear();
}
}
/**
* clear ON COMMIT PRESERVE temp table contents for this session
*/
void clearIndexRootsKeep() {
if (indexArrayKeepMap != null) {
indexArrayKeepMap.clear();
}
}
// warnings
HsqlArrayList sqlWarnings;
public void addWarning(HsqlException warning) {
if (sqlWarnings == null) {
sqlWarnings = new HsqlArrayList(true);
}
sqlWarnings.add(warning);
}
public HsqlException[] getAndClearWarnings() {
if (sqlWarnings == null) {
return new HsqlException[0];
}
HsqlException[] array = new HsqlException[sqlWarnings.size()];
sqlWarnings.toArray(array);
sqlWarnings.clear();
return array;
}
}
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