Examples with JDBCStatement org.jkiss.dbeaver.model.exec.jdbc.JDBCStatement used on opensource projects

Example 16 with JDBCStatement

use of org.jkiss.dbeaver.model.exec.jdbc.JDBCStatement in project dbeaver by serge-rider.

the class JDBCObjectCache method loadObjects.

protected synchronized void loadObjects(DBRProgressMonitor monitor, OWNER owner) throws DBException {
    if (isFullyCached() || monitor.isCanceled()) {
        return;
    }
    List<OBJECT> tmpObjectList = new ArrayList<>();
    DBPDataSource dataSource = owner.getDataSource();
    if (dataSource == null) {
        throw new DBException("Not connected to database");
    }
    try {
        try (JDBCSession session = DBUtils.openMetaSession(monitor, dataSource, "Load objects from " + owner.getName())) {
            try (JDBCStatement dbStat = prepareObjectsStatement(session, owner)) {
                monitor.subTask("Execute query");
                dbStat.setFetchSize(DBConstants.METADATA_FETCH_SIZE);
                dbStat.executeStatement();
                JDBCResultSet dbResult = dbStat.getResultSet();
                if (dbResult != null) {
                    try {
                        while (dbResult.next()) {
                            if (monitor.isCanceled()) {
                                break;
                            }
                            OBJECT object = fetchObject(session, owner, dbResult);
                            if (object == null) {
                                continue;
                            }
                            tmpObjectList.add(object);
                            //monitor.subTask(object.getName());
                            if (tmpObjectList.size() == maximumCacheSize) {
                                log.warn("Maximum cache size exceeded (" + maximumCacheSize + ") in " + this);
                                break;
                            }
                        }
                    } finally {
                        dbResult.close();
                    }
                }
            }
        } catch (SQLException ex) {
            throw new DBException(ex, dataSource);
        }
    } catch (DBException e) {
        if (!handleCacheReadError(e)) {
            throw e;
        }
    }
    Comparator<OBJECT> comparator = getListOrderComparator();
    if (comparator != null) {
        Collections.sort(tmpObjectList, comparator);
    }
    detectCaseSensitivity(owner);
    mergeCache(tmpObjectList);
    this.invalidateObjects(monitor, owner, new CacheIterator());
}

Example 17 with JDBCStatement

use of org.jkiss.dbeaver.model.exec.jdbc.JDBCStatement in project dbeaver by serge-rider.

the class JDBCStructLookupCache method reloadObject.

protected OBJECT reloadObject(@NotNull DBRProgressMonitor monitor, @NotNull OWNER owner, @Nullable OBJECT object, @Nullable String objectName) throws DBException {
    DBPDataSource dataSource = owner.getDataSource();
    if (dataSource == null) {
        throw new DBException("Not connected to database");
    }
    try (JDBCSession session = DBUtils.openMetaSession(monitor, dataSource, object == null ? "Load object '" + objectName + "' from " + owner.getName() : "Reload object '" + object + "' from " + owner.getName())) {
        try (JDBCStatement dbStat = prepareLookupStatement(session, owner, object, objectName)) {
            dbStat.setFetchSize(1);
            dbStat.executeStatement();
            JDBCResultSet dbResult = dbStat.getResultSet();
            if (dbResult != null) {
                try {
                    if (dbResult.next()) {
                        return fetchObject(session, owner, dbResult);
                    }
                } finally {
                    dbResult.close();
                }
            }
            return null;
        }
    } catch (SQLException ex) {
        throw new DBException("Error loading object metadata from database", ex, dataSource);
    }
}

Example 18 with JDBCStatement

use of org.jkiss.dbeaver.model.exec.jdbc.JDBCStatement in project dbeaver by serge-rider.

the class JDBCTable method readData.

@NotNull
@Override
public DBCStatistics readData(@NotNull DBCExecutionSource source, @NotNull DBCSession session, @NotNull DBDDataReceiver dataReceiver, @Nullable DBDDataFilter dataFilter, long firstRow, long maxRows, long flags) throws DBCException {
    DBCStatistics statistics = new DBCStatistics();
    boolean hasLimits = firstRow >= 0 && maxRows > 0;
    DBPDataSource dataSource = session.getDataSource();
    DBRProgressMonitor monitor = session.getProgressMonitor();
    try {
        readRequiredMeta(monitor);
    } catch (DBException e) {
        log.warn(e);
    }
    DBDPseudoAttribute rowIdAttribute = (flags & FLAG_READ_PSEUDO) != 0 ? DBUtils.getRowIdAttribute(this) : null;
    // Always use alias if we have criteria or ROWID.
    // Some criteria doesn't work without alias
    // (e.g. structured attributes in Oracle requires table alias)
    String tableAlias = null;
    if ((dataFilter != null && dataFilter.hasConditions()) || rowIdAttribute != null) {
        if (dataSource instanceof SQLDataSource) {
            if (((SQLDataSource) dataSource).getSQLDialect().supportsAliasInSelect()) {
                tableAlias = DEFAULT_TABLE_ALIAS;
            }
        }
    }
    if (rowIdAttribute != null && tableAlias == null) {
        log.warn("Can't query ROWID - table alias not supported");
        rowIdAttribute = null;
    }
    StringBuilder query = new StringBuilder(100);
    query.append("SELECT ");
    appendSelectSource(monitor, query, tableAlias, rowIdAttribute);
    query.append(" FROM ").append(getFullyQualifiedName(DBPEvaluationContext.DML));
    if (tableAlias != null) {
        //$NON-NLS-1$
        query.append(" ").append(tableAlias);
    }
    appendQueryConditions(query, tableAlias, dataFilter);
    appendQueryOrder(query, tableAlias, dataFilter);
    String sqlQuery = query.toString();
    statistics.setQueryText(sqlQuery);
    monitor.subTask(ModelMessages.model_jdbc_fetch_table_data);
    try (DBCStatement dbStat = DBUtils.makeStatement(source, session, DBCStatementType.SCRIPT, sqlQuery, firstRow, maxRows)) {
        if (monitor.isCanceled()) {
            return statistics;
        }
        if (dbStat instanceof JDBCStatement && maxRows > 0) {
            boolean useFetchSize = getDataSource().getContainer().getPreferenceStore().getBoolean(ModelPreferences.RESULT_SET_USE_FETCH_SIZE);
            if (useFetchSize) {
                try {
                    ((JDBCStatement) dbStat).setFetchSize(firstRow < 0 || maxRows <= 0 ? DEFAULT_READ_FETCH_SIZE : (int) (firstRow + maxRows));
                } catch (Exception e) {
                    log.warn(e);
                }
            }
        }
        long startTime = System.currentTimeMillis();
        boolean executeResult = dbStat.executeStatement();
        statistics.setExecuteTime(System.currentTimeMillis() - startTime);
        if (executeResult) {
            DBCResultSet dbResult = dbStat.openResultSet();
            if (dbResult != null && !monitor.isCanceled()) {
                try {
                    dataReceiver.fetchStart(session, dbResult, firstRow, maxRows);
                    startTime = System.currentTimeMillis();
                    long rowCount = 0;
                    while (dbResult.nextRow()) {
                        if (monitor.isCanceled() || (hasLimits && rowCount >= maxRows)) {
                            // Fetch not more than max rows
                            break;
                        }
                        dataReceiver.fetchRow(session, dbResult);
                        rowCount++;
                        if (rowCount % 100 == 0) {
                            monitor.subTask(rowCount + ModelMessages.model_jdbc__rows_fetched);
                            monitor.worked(100);
                        }
                    }
                    statistics.setFetchTime(System.currentTimeMillis() - startTime);
                    statistics.setRowsFetched(rowCount);
                } finally {
                    // First - close cursor
                    try {
                        dbResult.close();
                    } catch (Throwable e) {
                        //$NON-NLS-1$
                        log.error("Error closing result set", e);
                    }
                    // Then - signal that fetch was ended
                    try {
                        dataReceiver.fetchEnd(session, dbResult);
                    } catch (Throwable e) {
                        //$NON-NLS-1$
                        log.error("Error while finishing result set fetch", e);
                    }
                }
            }
        }
        return statistics;
    } finally {
        dataReceiver.close();
    }
}