List of usage examples for java.sql Statement CLOSE_CURRENT_RESULT
int CLOSE_CURRENT_RESULT
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ResultSet object should be closed when calling getMoreResults. From source file:com.alibaba.wasp.jdbc.JdbcStatement.java
/** * Move to the next result set. This method always returns false. * //from w ww .j a va 2s .c o m * @param current * Statement.CLOSE_CURRENT_RESULT, Statement.KEEP_CURRENT_RESULT, or * Statement.CLOSE_ALL_RESULTS * @return false */ @Override public boolean getMoreResults(int current) throws SQLException { try { switch (current) { case Statement.CLOSE_CURRENT_RESULT: case Statement.CLOSE_ALL_RESULTS: checkClosed(); closeOldResultSet(); break; case Statement.KEEP_CURRENT_RESULT: // nothing to do break; default: throw JdbcException.getInvalidValueException("current", current); } return false; } catch (Exception e) { throw Logger.logAndConvert(log, e); } }
From source file:com.alibaba.wasp.jdbc.TestPreparedStatement.java
public void testGetMoreResults() throws SQLException { Statement stat = conn.createStatement(); PreparedStatement prep;/*w w w . jav a 2 s . c o m*/ ResultSet rs; stat.execute("CREATE TABLE TEST(ID INT)"); stat.execute("INSERT INTO TEST VALUES(1)"); prep = conn.prepareStatement("SELECT * FROM TEST"); // just to check if it doesn't throw an exception - it may be null prep.getMetaData(); assertTrue(prep.execute()); rs = prep.getResultSet(); assertFalse(prep.getMoreResults()); assertEquals(-1, prep.getUpdateCount()); // supposed to be closed now assertThrows(SQLErrorCode.OBJECT_CLOSED, rs).next(); assertEquals(-1, prep.getUpdateCount()); prep = conn.prepareStatement("UPDATE TEST SET ID = 2"); assertFalse(prep.execute()); assertEquals(1, prep.getUpdateCount()); assertFalse(prep.getMoreResults(Statement.CLOSE_CURRENT_RESULT)); assertEquals(-1, prep.getUpdateCount()); // supposed to be closed now assertThrows(SQLErrorCode.OBJECT_CLOSED, rs).next(); assertEquals(-1, prep.getUpdateCount()); prep = conn.prepareStatement("DELETE FROM TEST"); prep.executeUpdate(); assertFalse(prep.getMoreResults()); assertEquals(-1, prep.getUpdateCount()); }
From source file:net.starschema.clouddb.jdbc.BQStatementRoot.java
/** * <p>// w ww. j a v a2 s . c o m * <h1>Implementation Details:</h1><br> * Multiple result sets are not supported currently. we check that the * result set is open, the parameter is acceptable, and close our current * resultset or throw a FeatureNotSupportedException * </p> * * @param current * - one of the following Statement constants indicating what * should happen to current ResultSet objects obtained using the * method getResultSet: Statement.CLOSE_CURRENT_RESULT, * Statement.KEEP_CURRENT_RESULT, or Statement.CLOSE_ALL_RESULTS * @throws BQSQLException */ public boolean getMoreResults(int current) throws SQLException { if (this.closed) { throw new BQSQLException("Statement is closed."); } if (current == Statement.CLOSE_CURRENT_RESULT || current == Statement.KEEP_CURRENT_RESULT || current == Statement.CLOSE_ALL_RESULTS) { if (BQDatabaseMetadata.multipleOpenResultsSupported && (current == Statement.KEEP_CURRENT_RESULT || current == Statement.CLOSE_ALL_RESULTS)) { throw new BQSQLFeatureNotSupportedException(); } // Statement.CLOSE_CURRENT_RESULT this.close(); return false; } else { throw new BQSQLException("Wrong parameter."); } }
From source file:org.apache.nifi.processors.standard.AbstractExecuteSQL.java
@Override public void onTrigger(final ProcessContext context, final ProcessSession session) throws ProcessException { FlowFile fileToProcess = null;//from ww w . j ava 2s . c o m if (context.hasIncomingConnection()) { fileToProcess = session.get(); // If we have no FlowFile, and all incoming connections are self-loops then we can continue on. // However, if we have no FlowFile and we have connections coming from other Processors, then // we know that we should run only if we have a FlowFile. if (fileToProcess == null && context.hasNonLoopConnection()) { return; } } final List<FlowFile> resultSetFlowFiles = new ArrayList<>(); final ComponentLog logger = getLogger(); final Integer queryTimeout = context.getProperty(QUERY_TIMEOUT).asTimePeriod(TimeUnit.SECONDS).intValue(); final Integer maxRowsPerFlowFile = context.getProperty(MAX_ROWS_PER_FLOW_FILE) .evaluateAttributeExpressions().asInteger(); final Integer outputBatchSizeField = context.getProperty(OUTPUT_BATCH_SIZE).evaluateAttributeExpressions() .asInteger(); final int outputBatchSize = outputBatchSizeField == null ? 0 : outputBatchSizeField; SqlWriter sqlWriter = configureSqlWriter(session, context, fileToProcess); final String selectQuery; if (context.getProperty(SQL_SELECT_QUERY).isSet()) { selectQuery = context.getProperty(SQL_SELECT_QUERY).evaluateAttributeExpressions(fileToProcess) .getValue(); } else { // If the query is not set, then an incoming flow file is required, and expected to contain a valid SQL select query. // If there is no incoming connection, onTrigger will not be called as the processor will fail when scheduled. final StringBuilder queryContents = new StringBuilder(); session.read(fileToProcess, in -> queryContents.append(IOUtils.toString(in, Charset.defaultCharset()))); selectQuery = queryContents.toString(); } int resultCount = 0; try (final Connection con = dbcpService .getConnection(fileToProcess == null ? Collections.emptyMap() : fileToProcess.getAttributes()); final PreparedStatement st = con.prepareStatement(selectQuery)) { st.setQueryTimeout(queryTimeout); // timeout in seconds if (fileToProcess != null) { JdbcCommon.setParameters(st, fileToProcess.getAttributes()); } logger.debug("Executing query {}", new Object[] { selectQuery }); int fragmentIndex = 0; final String fragmentId = UUID.randomUUID().toString(); final StopWatch executionTime = new StopWatch(true); boolean hasResults = st.execute(); long executionTimeElapsed = executionTime.getElapsed(TimeUnit.MILLISECONDS); boolean hasUpdateCount = st.getUpdateCount() != -1; while (hasResults || hasUpdateCount) { //getMoreResults() and execute() return false to indicate that the result of the statement is just a number and not a ResultSet if (hasResults) { final AtomicLong nrOfRows = new AtomicLong(0L); try { final ResultSet resultSet = st.getResultSet(); do { final StopWatch fetchTime = new StopWatch(true); FlowFile resultSetFF; if (fileToProcess == null) { resultSetFF = session.create(); } else { resultSetFF = session.create(fileToProcess); resultSetFF = session.putAllAttributes(resultSetFF, fileToProcess.getAttributes()); } try { resultSetFF = session.write(resultSetFF, out -> { try { nrOfRows.set(sqlWriter.writeResultSet(resultSet, out, getLogger(), null)); } catch (Exception e) { throw (e instanceof ProcessException) ? (ProcessException) e : new ProcessException(e); } }); long fetchTimeElapsed = fetchTime.getElapsed(TimeUnit.MILLISECONDS); // set attributes final Map<String, String> attributesToAdd = new HashMap<>(); attributesToAdd.put(RESULT_ROW_COUNT, String.valueOf(nrOfRows.get())); attributesToAdd.put(RESULT_QUERY_DURATION, String.valueOf(executionTimeElapsed + fetchTimeElapsed)); attributesToAdd.put(RESULT_QUERY_EXECUTION_TIME, String.valueOf(executionTimeElapsed)); attributesToAdd.put(RESULT_QUERY_FETCH_TIME, String.valueOf(fetchTimeElapsed)); attributesToAdd.put(RESULTSET_INDEX, String.valueOf(resultCount)); attributesToAdd.putAll(sqlWriter.getAttributesToAdd()); resultSetFF = session.putAllAttributes(resultSetFF, attributesToAdd); sqlWriter.updateCounters(session); // if fragmented ResultSet, determine if we should keep this fragment; set fragment attributes if (maxRowsPerFlowFile > 0) { // if row count is zero and this is not the first fragment, drop it instead of committing it. if (nrOfRows.get() == 0 && fragmentIndex > 0) { session.remove(resultSetFF); break; } resultSetFF = session.putAttribute(resultSetFF, FRAGMENT_ID, fragmentId); resultSetFF = session.putAttribute(resultSetFF, FRAGMENT_INDEX, String.valueOf(fragmentIndex)); } logger.info("{} contains {} records; transferring to 'success'", new Object[] { resultSetFF, nrOfRows.get() }); // Report a FETCH event if there was an incoming flow file, or a RECEIVE event otherwise if (context.hasIncomingConnection()) { session.getProvenanceReporter().fetch(resultSetFF, "Retrieved " + nrOfRows.get() + " rows", executionTimeElapsed + fetchTimeElapsed); } else { session.getProvenanceReporter().receive(resultSetFF, "Retrieved " + nrOfRows.get() + " rows", executionTimeElapsed + fetchTimeElapsed); } resultSetFlowFiles.add(resultSetFF); // If we've reached the batch size, send out the flow files if (outputBatchSize > 0 && resultSetFlowFiles.size() >= outputBatchSize) { session.transfer(resultSetFlowFiles, REL_SUCCESS); session.commit(); resultSetFlowFiles.clear(); } fragmentIndex++; } catch (Exception e) { // Remove the result set flow file and propagate the exception session.remove(resultSetFF); if (e instanceof ProcessException) { throw (ProcessException) e; } else { throw new ProcessException(e); } } } while (maxRowsPerFlowFile > 0 && nrOfRows.get() == maxRowsPerFlowFile); // If we are splitting results but not outputting batches, set count on all FlowFiles if (outputBatchSize == 0 && maxRowsPerFlowFile > 0) { for (int i = 0; i < resultSetFlowFiles.size(); i++) { resultSetFlowFiles.set(i, session.putAttribute(resultSetFlowFiles.get(i), FRAGMENT_COUNT, Integer.toString(fragmentIndex))); } } } catch (final SQLException e) { throw new ProcessException(e); } resultCount++; } // are there anymore result sets? try { hasResults = st.getMoreResults(Statement.CLOSE_CURRENT_RESULT); hasUpdateCount = st.getUpdateCount() != -1; } catch (SQLException ex) { hasResults = false; hasUpdateCount = false; } } // Transfer any remaining files to SUCCESS session.transfer(resultSetFlowFiles, REL_SUCCESS); resultSetFlowFiles.clear(); //If we had at least one result then it's OK to drop the original file, but if we had no results then // pass the original flow file down the line to trigger downstream processors if (fileToProcess != null) { if (resultCount > 0) { session.remove(fileToProcess); } else { fileToProcess = session.write(fileToProcess, out -> sqlWriter.writeEmptyResultSet(out, getLogger())); fileToProcess = session.putAttribute(fileToProcess, RESULT_ROW_COUNT, "0"); fileToProcess = session.putAttribute(fileToProcess, CoreAttributes.MIME_TYPE.key(), sqlWriter.getMimeType()); session.transfer(fileToProcess, REL_SUCCESS); } } else if (resultCount == 0) { //If we had no inbound FlowFile, no exceptions, and the SQL generated no result sets (Insert/Update/Delete statements only) // Then generate an empty Output FlowFile FlowFile resultSetFF = session.create(); resultSetFF = session.write(resultSetFF, out -> sqlWriter.writeEmptyResultSet(out, getLogger())); resultSetFF = session.putAttribute(resultSetFF, RESULT_ROW_COUNT, "0"); resultSetFF = session.putAttribute(resultSetFF, CoreAttributes.MIME_TYPE.key(), sqlWriter.getMimeType()); session.transfer(resultSetFF, REL_SUCCESS); } } catch (final ProcessException | SQLException e) { //If we had at least one result then it's OK to drop the original file, but if we had no results then // pass the original flow file down the line to trigger downstream processors if (fileToProcess == null) { // This can happen if any exceptions occur while setting up the connection, statement, etc. logger.error("Unable to execute SQL select query {} due to {}. No FlowFile to route to failure", new Object[] { selectQuery, e }); context.yield(); } else { if (context.hasIncomingConnection()) { logger.error("Unable to execute SQL select query {} for {} due to {}; routing to failure", new Object[] { selectQuery, fileToProcess, e }); fileToProcess = session.penalize(fileToProcess); } else { logger.error("Unable to execute SQL select query {} due to {}; routing to failure", new Object[] { selectQuery, e }); context.yield(); } session.transfer(fileToProcess, REL_FAILURE); } } }