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JDBC Driver for the Firebird RDBMS
/*
* $Id: GDSHelper.java 60362 2014-12-13 14:24:32Z mrotteveel $
*
* Public Firebird Java API.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. 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.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*/
package org.firebirdsql.gds.impl;
import java.sql.SQLException;
import java.util.Collections;
import java.util.List;
import org.firebirdsql.encodings.Encoding;
import org.firebirdsql.encodings.EncodingFactory;
import org.firebirdsql.gds.*;
import org.firebirdsql.logging.Logger;
import org.firebirdsql.logging.LoggerFactory;
/**
* Helper class for all GDS-related operations.
*/
public class GDSHelper {
public static final int DEFAULT_BLOB_BUFFER_SIZE = 16 * 1024;
/**
* Notification listener about any error that occured in this class.
*/
public interface GDSHelperErrorListener {
/**
* Notify about the error in this class.
*
* @param ex error that occured.
*/
void errorOccured(GDSException ex);
}
private static final Logger log = LoggerFactory.getLogger(GDSHelper.class, false);
private GDS gds;
private IscDbHandle currentDbHandle;
private AbstractIscTrHandle currentTr;
/**
* Needed from mcf when killing a db handle when a new tx cannot be started.
*/
protected DatabaseParameterBuffer dpb;
private boolean registerResultSets;
private GDSHelperErrorListener listener;
/**
* Create instance of this class.
*/
public GDSHelper(GDS gds, DatabaseParameterBuffer dpb, IscDbHandle dbHandle, GDSHelperErrorListener listener) {
this.gds = gds;
this.dpb = dpb;
this.currentDbHandle = dbHandle;
this.registerResultSets = !getDatabaseParameterBuffer().hasArgument(
DatabaseParameterBufferExtension.NO_RESULT_SET_TRACKING);
this.listener = listener;
}
private void notifyListeners(GDSException ex) {
if (listener != null)
listener.errorOccured(ex);
}
public synchronized AbstractIscTrHandle getCurrentTrHandle() {
return currentTr;
}
public synchronized void setCurrentTrHandle(AbstractIscTrHandle currentTr) {
this.currentTr = currentTr;
notify();
}
public IscDbHandle getCurrentDbHandle() {
return currentDbHandle;
}
public DatabaseParameterBuffer getDatabaseParameterBuffer() {
return dpb;
}
/**
* @return Connection dialect from DPB (or default if not specified)
*/
public int getDialect() {
if (dpb.hasArgument(ISCConstants.isc_dpb_sql_dialect))
return dpb.getArgumentAsInt(ISCConstants.isc_dpb_sql_dialect);
return ISCConstants.SQL_DIALECT_CURRENT;
}
/**
* Retrieve a newly allocated statment handle with the current connection.
*
* @return The new statement handle
* @throws GDSException
* if a database access error occurs
*/
public AbstractIscStmtHandle allocateStatement() throws GDSException {
try {
AbstractIscStmtHandle stmt = (AbstractIscStmtHandle)gds.createIscStmtHandle();
gds.iscDsqlAllocateStatement(getCurrentDbHandle(), stmt);
return stmt;
} catch(GDSException ex) {
notifyListeners(ex);
throw ex;
}
}
/**
* Retrieve whether this connection is currently involved in a transaction
*
* @return true if this connection is currently in a
* transaction, false otherwise.
*/
public boolean inTransaction() {
return currentTr != null;
}
public int getTransactionId(IscTrHandle trHandle)
throws GDSException {
try {
byte [] trInfo = gds.iscTransactionInformation(
trHandle, new byte[]{ ISCConstants.isc_info_tra_id}, 32);
if (trInfo.length < 3 || trInfo[0] != ISCConstants.isc_info_tra_id){
throw new GDSException("Unexpected response buffer");
}
int length = gds.iscVaxInteger(trInfo, 1, 2);
return gds.iscVaxInteger(trInfo, 3, length);
} catch(GDSException ex) {
notifyListeners(ex);
throw ex;
}
}
/**
* Prepare an SQL string for execution (within the database server) in the
* context of a statement handle.
*
* @param stmt
* The statement handle within which the SQL statement will be
* prepared
* @param sql
* The SQL statement to be prepared
* @param describeBind
* Send bind data to the database server
* @throws GDSException
* if a Firebird-specific error occurs
* @throws SQLException
* if a database access error occurs
*/
public void prepareStatement(AbstractIscStmtHandle stmt, String sql,
boolean describeBind) throws GDSException, SQLException {
try {
if (log != null) log.trace("preparing sql: " + sql);
String localEncoding =
dpb.getArgumentAsString(DatabaseParameterBufferExtension.LOCAL_ENCODING);
String mappingPath =
dpb.getArgumentAsString(DatabaseParameterBufferExtension.MAPPING_PATH);
Encoding encoding =
EncodingFactory.getEncoding(localEncoding, mappingPath);
int dialect = getDialect();
XSQLDA out = gds.iscDsqlPrepare(currentTr, stmt,
encoding.encodeToCharset(sql), dialect);
if (out.sqld != out.sqln)
throw new GDSException("Not all columns returned");
if (describeBind)
gds.iscDsqlDescribeBind(stmt, ISCConstants.SQLDA_VERSION1);
stmt.statement = sql;
} catch(GDSException ex) {
notifyListeners(ex);
throw ex;
}
}
/**
* Execute a statement in the database.
*
* @param stmt
* The handle to the statement to be executed
* @param sendOutSqlda
* Determines if the XSQLDA structure should be sent to the
* database
* @throws GDSException
* if a Firebird-specific error occurs
*/
public void executeStatement(AbstractIscStmtHandle stmt, boolean sendOutSqlda)
throws GDSException {
try {
if (log != null && log.isDebugEnabled())
log.debug("Executing " + stmt.statement);
// System.out.println("Executing " + stmt.statement);
gds.iscDsqlExecute2(currentTr, stmt, ISCConstants.SQLDA_VERSION1,
stmt.getInSqlda(), (sendOutSqlda) ? stmt.getOutSqlda() : null);
} catch(GDSException ex) {
notifyListeners(ex);
throw ex;
}
}
/**
* Execute a SQL statement directly with the current connection.
*
* @param statement
* The SQL statement to execute
* @throws GDSException
* if a Firebird-specific error occurs
*/
public void executeImmediate(String statement) throws GDSException {
try {
gds.iscDsqlExecImmed2(getIscDBHandle(), currentTr, statement, 3,
null, null);
} catch(GDSException ex) {
notifyListeners(ex);
throw ex;
}
}
/**
* Fetch data from a statement in the database.
*
* @param stmt
* handle to the statement from which data will be fetched
* @param fetchSize
* The number of records to fetch
* @throws GDSException
* if a Firebird-specific error occurs
*/
public void fetch(AbstractIscStmtHandle stmt, int fetchSize) throws GDSException {
try {
gds.iscDsqlFetch(stmt, ISCConstants.SQLDA_VERSION1,
stmt.getOutSqlda(), fetchSize);
if (registerResultSets)
currentTr.registerStatementWithTransaction(stmt);
} catch(GDSException ex) {
notifyListeners(ex);
throw ex;
}
}
/**
* Set the cursor name for a statement.
*
* @param stmt
* handle to statement for which the cursor name will be set
* @param cursorName
* the name for the cursor
* @throws GDSException
* if a Firebird-specific database access error occurs
*/
public void setCursorName(AbstractIscStmtHandle stmt, String cursorName)
throws GDSException {
try {
gds.iscDsqlSetCursorName(stmt, cursorName, 0);
} catch(GDSException ex) {
notifyListeners(ex);
throw ex;
}
}
/**
* Close a statement that is allocated in the database. The statement can be
* optionally deallocated.
*
* @param stmt
* handle to the statement to be closed
* @param deallocate
* if true, the statement will be deallocated,
* otherwise it will not be deallocated
* @throws GDSException
* if a Firebird-specific database access error occurs
*/
public void closeStatement(AbstractIscStmtHandle stmt, boolean deallocate)
throws GDSException {
try {
if (!deallocate && !stmt.hasOpenResultSet())
return;
try {
gds.iscDsqlFreeStatement(stmt, (deallocate) ? ISCConstants.DSQL_drop
: ISCConstants.DSQL_close);
} catch(GDSException ex) {
// we do not handle exceptions comming from statement closing
if (deallocate)
throw ex;
boolean recloseClosedCursorError = false;
GDSException tempEx = ex;
do {
if (tempEx.getIntParam() == ISCConstants.isc_dsql_cursor_close_err) {
recloseClosedCursorError = true;
break;
}
tempEx = tempEx.getNext();
} while(tempEx != null);
if (!recloseClosedCursorError)
throw ex;
}
} catch(GDSException ex) {
notifyListeners(ex);
throw ex;
}
}
/**
* Fetch the count information for a statement handle. The count information
* that is updated includes the counts for update, insert, delete and
* select, and it is set in the handle itself.
*
* @param stmt
* handle to the statement for which counts will be fetched
* @throws GDSException
* if a Firebird-specific database access error occurs
*/
public void getSqlCounts(AbstractIscStmtHandle stmt) throws GDSException {
try {
gds.getSqlCounts(stmt);
} catch(GDSException ex) {
notifyListeners(ex);
throw ex;
}
}
public void populateStatementInfo(AbstractIscStmtHandle fixedStmt) throws GDSException {
final byte [] REQUEST = new byte [] {
ISCConstants.isc_info_sql_get_plan,
ISCConstants.isc_info_sql_stmt_type,
ISCConstants.isc_info_end };
try {
int bufferSize = 1024;
byte[] buffer;
while (true){
buffer = gds.iscDsqlSqlInfo(fixedStmt, REQUEST, bufferSize);
if (buffer[0] != ISCConstants.isc_info_truncated){
break;
}
bufferSize *= 2;
}
if (buffer[0] == ISCConstants.isc_info_end){
throw new GDSException(ISCConstants.isc_req_sync);
}
String executionPlan = null;
int statementType = IscStmtHandle.TYPE_UNKNOWN;
int dataLength = -1;
for (int i = 0; i < buffer.length; i++){
switch(buffer[i]){
case ISCConstants.isc_info_sql_get_plan:
dataLength = gds.iscVaxInteger(buffer, ++i, 2);
i += 2;
// Skipping first char as it is a linefeed
executionPlan = new String(buffer, i + 1, dataLength - 1);
i += dataLength - 1;
break;
case ISCConstants.isc_info_sql_stmt_type:
dataLength = gds.iscVaxInteger(buffer, ++i, 2);
i += 2;
statementType = gds.iscVaxInteger(buffer, i, dataLength);
i += dataLength;
break;
case ISCConstants.isc_info_end:
case 0:
break;
default:
throw new GDSException(ISCConstants.isc_req_sync);
}
}
fixedStmt.setExecutionPlan(executionPlan);
fixedStmt.setStatementType(statementType);
} catch(GDSException ex) {
notifyListeners(ex);
throw ex;
}
}
/**
* Open a handle to a new blob within the current transaction with the given
* id.
*
* @param blob_id
* The identifier to be given to the blob
* @param segmented
* If true, the blob will be segmented, otherwise
* is will be streamed
* @throws GDSException
* if a Firebird-specific database error occurs
*/
public IscBlobHandle openBlob(long blob_id, boolean segmented)
throws GDSException {
try {
IscBlobHandle blob = gds.createIscBlobHandle();
blob.setBlobId(blob_id);
BlobParameterBuffer blobParameterBuffer = gds.createBlobParameterBuffer();
blobParameterBuffer.addArgument(BlobParameterBuffer.TYPE,
segmented ? BlobParameterBuffer.TYPE_SEGMENTED
: BlobParameterBuffer.TYPE_STREAM);
gds.iscOpenBlob2(currentDbHandle, currentTr, blob,
blobParameterBuffer);
return blob;
} catch(GDSException ex) {
notifyListeners(ex);
throw ex;
}
}
/**
* Create a new blob within the current transaction.
*
* @param segmented
* If true the blob will be segmented, otherwise
* it will be streamed
* @throws GDSException
* if a Firebird-specific database error occurs
*/
public IscBlobHandle createBlob(boolean segmented) throws GDSException {
try {
IscBlobHandle blob = gds.createIscBlobHandle();
BlobParameterBuffer blobParameterBuffer = gds.createBlobParameterBuffer();
blobParameterBuffer.addArgument(BlobParameterBuffer.TYPE,
segmented ? BlobParameterBuffer.TYPE_SEGMENTED
: BlobParameterBuffer.TYPE_STREAM);
gds.iscCreateBlob2(currentDbHandle, currentTr, blob,
blobParameterBuffer);
return blob;
} catch(GDSException ex) {
notifyListeners(ex);
throw ex;
}
}
/**
* Get a segment from a blob.
*
* @param blob
* Handle to the blob from which the segment is to be fetched
* @param len
* The maximum length to fetch
* @throws GDSException
* if a Firebird-specific database access error occurs
*/
public byte[] getBlobSegment(IscBlobHandle blob, int len)
throws GDSException {
try {
return gds.iscGetSegment(blob, len);
} catch(GDSException ex) {
notifyListeners(ex);
throw ex;
}
}
/**
* Close a blob that has been opened within the database.
*
* @param blob
* Handle to the blob to be closed
* @throws GDSException
* if a Firebird-specific database access error occurs
*/
public void closeBlob(IscBlobHandle blob) throws GDSException {
try {
gds.iscCloseBlob(blob);
} catch(GDSException ex) {
notifyListeners(ex);
throw ex;
}
}
public void seekBlob(IscBlobHandle blob, int position, int mode) throws GDSException {
try {
gds.iscSeekBlob(blob, position, mode);
} catch(GDSException ex) {
notifyListeners(ex);
throw ex;
}
}
/**
* Write a segment of data to a blob.
*
* @param blob
* handle to the blob to which data will be written
* @param buf
* segment of data to be written to the blob
* @throws GDSException
* if a Firebird-specific database access error occurs
*/
public void putBlobSegment(IscBlobHandle blob, byte[] buf)
throws GDSException {
try {
gds.iscPutSegment(blob, buf);
} catch(GDSException ex) {
notifyListeners(ex);
throw ex;
}
}
public byte[] getBlobInfo(IscBlobHandle blob, byte[] requestItems, int bufferLength) throws GDSException {
try {
return gds.iscBlobInfo(blob, requestItems, bufferLength);
} catch(GDSException ex) {
notifyListeners(ex);
throw ex;
}
}
public static final byte[] BLOB_LENGTH_REQUEST = new byte[]{ISCConstants.isc_info_blob_total_length};
public int getBlobLength(IscBlobHandle blob) throws GDSException {
try {
byte[] info = gds.iscBlobInfo(blob, BLOB_LENGTH_REQUEST, 20);
if (info.length == 0 || info[0] != ISCConstants.isc_info_blob_total_length)
throw new GDSException(ISCConstants.isc_req_sync);
int dataLength = gds.iscVaxInteger(info, 1, 2);
return gds.iscVaxInteger(info, 3, dataLength);
} catch(GDSException ex) {
notifyListeners(ex);
throw ex;
}
}
public AbstractIscTrHandle startTransaction(TransactionParameterBuffer tpb) throws GDSException {
try {
AbstractIscTrHandle trHandle = (AbstractIscTrHandle)gds.createIscTrHandle();
gds.iscStartTransaction(trHandle, currentDbHandle, tpb);
setCurrentTrHandle(trHandle);
return trHandle;
} catch(GDSException ex) {
notifyListeners(ex);
throw ex;
}
}
public void prepareTransaction(AbstractIscTrHandle trHandle, byte[] message) throws GDSException {
try {
gds.iscPrepareTransaction2(trHandle, message);
} catch(GDSException ex) {
notifyListeners(ex);
throw ex;
}
}
public void commitTransaction(AbstractIscTrHandle trHandle) throws GDSException {
try {
gds.iscCommitTransaction(trHandle);
} catch(GDSException ex) {
notifyListeners(ex);
throw ex;
}
}
public void rollbackTransaction(AbstractIscTrHandle trHandle) throws GDSException {
try {
gds.iscRollbackTransaction(trHandle);
} catch(GDSException ex) {
notifyListeners(ex);
throw ex;
}
}
public void detachDatabase() throws GDSException {
try {
gds.iscDetachDatabase(currentDbHandle);
} catch(GDSException ex) {
notifyListeners(ex);
throw ex;
}
}
/**
* Cancel the currently running operation.
*/
public void cancelOperation() throws GDSException {
try {
gds.fbCancelOperation(currentDbHandle, ISCConstants.fb_cancel_raise);
} catch(GDSException ex) {
notifyListeners(ex);
throw ex;
}
}
public int iscVaxInteger(byte[] buffer, int pos, int length) {
return gds.iscVaxInteger(buffer, pos, length);
}
// for DatabaseMetaData.
/**
* Get the name of the database product that we're connected to.
*
* @return The database product name (i.e. Firebird or Interbase)
*/
public String getDatabaseProductName() {
/** @todo add check if mc is not null */
return currentDbHandle.getDatabaseProductName();
}
/**
* Get the version of the the database that we're connected to
*
* @return the database product version
*/
public String getDatabaseProductVersion() {
/** @todo add check if mc is not null */
return currentDbHandle.getDatabaseProductVersion();
}
/**
* Get the major version number of the database that we're connected to.
*
* @return The major version number of the database
*/
public int getDatabaseProductMajorVersion() {
/** @todo add check if mc is not null */
return currentDbHandle.getDatabaseProductMajorVersion();
}
/**
* Get the minor version number of the database that we're connected to.
*
* @return The minor version number of the database
*/
public int getDatabaseProductMinorVersion() {
/** @todo add check if mc is not null */
return currentDbHandle.getDatabaseProductMinorVersion();
}
/**
* Compares the version of this database to the specified major and
* minor version.
*
* This method follows the semantics of {@link Comparable}: returns a
* negative value if the version of this database connection is smaller than
* the supplied arguments, 0 if they are equal or positive if its bigger.
*
*
* @param major
* Major version to compare
* @param minor
* Minor version to compare
* @return a negative integer, zero, or a positive integer as this database
* version is less than, equal to, or greater than the specified
* major and minor version
*/
public int compareToVersion(int major, int minor) {
int differenceMajor = getDatabaseProductMajorVersion() - major;
if (differenceMajor == 0) {
return getDatabaseProductMinorVersion() - minor;
}
return differenceMajor;
}
/**
* Get the database login name of the user that we're connected as.
*
* @return The username of the current database user
*/
public String getUserName() {
return dpb.getArgumentAsString(ISCConstants.isc_dpb_user);
}
/**
* Get the buffer length for blobs for this connection.
*
* @return The length of blob buffers
*/
public int getBlobBufferLength() {
if (dpb.hasArgument(DatabaseParameterBufferExtension.BLOB_BUFFER_SIZE))
return dpb.getArgumentAsInt(DatabaseParameterBufferExtension.BLOB_BUFFER_SIZE);
else
return DEFAULT_BLOB_BUFFER_SIZE;
}
/**
* Get the encoding used for this connection.
*
* @return The name of the encoding used
*/
public String getIscEncoding() {
try {
String result = dpb.getArgumentAsString(ISCConstants.isc_dpb_lc_ctype);
if (result == null) result = "NONE";
return result;
} catch (NullPointerException ex) {
return "NONE";
}
}
public String getJavaEncoding() {
return dpb.getArgumentAsString(DatabaseParameterBufferExtension.LOCAL_ENCODING);
}
public String getMappingPath() {
return dpb.getArgumentAsString(DatabaseParameterBufferExtension.MAPPING_PATH);
}
/**
* Get all warnings associated with current connection.
*
* @return list of {@link GDSException}instances representing warnings for
* this database connection.
*/
public List getWarnings() {
if (currentDbHandle == null)
return Collections.EMPTY_LIST;
else
return currentDbHandle.getWarnings();
}
/**
* Clear warnings for this database connection.
*/
public void clearWarnings() {
if (currentDbHandle != null) currentDbHandle.clearWarnings();
}
/**
* Get connection handle for direct Firebird API access
*
* @return internal handle for connection
*/
public IscDbHandle getIscDBHandle() {
return currentDbHandle;
}
/**
* Get Firebird API handler (sockets/native/embeded/etc)
*
* @return handler object for internal API calls
*/
public GDS getInternalAPIHandler() {
return gds;
}
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