Examples with ResultInterface org.h2.result.ResultInterface used on opensource projects

Example 1 with ResultInterface

use of org.h2.result.ResultInterface in project h2database by h2database.

the class AlterTableAlterColumn method checkNoNullValues.

private void checkNoNullValues(Table table) {
    String sql = "SELECT COUNT(*) FROM " + table.getSQL() + " WHERE " + oldColumn.getSQL() + " IS NULL";
    Prepared command = session.prepare(sql);
    ResultInterface result = command.query(0);
    result.next();
    if (result.currentRow()[0].getInt() > 0) {
        throw DbException.get(ErrorCode.COLUMN_CONTAINS_NULL_VALUES_1, oldColumn.getSQL());
    }
}

Example 2 with ResultInterface

use of org.h2.result.ResultInterface in project h2database by h2database.

the class CommandContainer method query.

@Override
public ResultInterface query(int maxrows) {
    recompileIfRequired();
    setProgress(DatabaseEventListener.STATE_STATEMENT_START);
    start();
    prepared.checkParameters();
    ResultInterface result = prepared.query(maxrows);
    prepared.trace(startTimeNanos, result.isLazy() ? 0 : result.getRowCount());
    setProgress(DatabaseEventListener.STATE_STATEMENT_END);
    return result;
}

Example 3 with ResultInterface

use of org.h2.result.ResultInterface in project h2database by h2database.

the class Analyze method analyzeTable.

/**
 * Analyze this table.
 *
 * @param session the session
 * @param table the table
 * @param sample the number of sample rows
 * @param manual whether the command was called by the user
 */
public static void analyzeTable(Session session, Table table, int sample, boolean manual) {
    if (table.getTableType() != TableType.TABLE || table.isHidden() || session == null) {
        return;
    }
    if (!manual) {
        if (session.getDatabase().isSysTableLocked()) {
            return;
        }
        if (table.hasSelectTrigger()) {
            return;
        }
    }
    if (table.isTemporary() && !table.isGlobalTemporary() && session.findLocalTempTable(table.getName()) == null) {
        return;
    }
    if (table.isLockedExclusively() && !table.isLockedExclusivelyBy(session)) {
        return;
    }
    if (!session.getUser().hasRight(table, Right.SELECT)) {
        return;
    }
    if (session.getCancel() != 0) {
        // if the connection is closed and there is something to undo
        return;
    }
    Column[] columns = table.getColumns();
    if (columns.length == 0) {
        return;
    }
    Database db = session.getDatabase();
    StatementBuilder buff = new StatementBuilder("SELECT ");
    for (Column col : columns) {
        buff.appendExceptFirst(", ");
        int type = col.getType();
        if (type == Value.BLOB || type == Value.CLOB) {
            // can not index LOB columns, so calculating
            // the selectivity is not required
            buff.append("MAX(NULL)");
        } else {
            buff.append("SELECTIVITY(").append(col.getSQL()).append(')');
        }
    }
    buff.append(" FROM ").append(table.getSQL());
    if (sample > 0) {
        buff.append(" LIMIT ? SAMPLE_SIZE ? ");
    }
    String sql = buff.toString();
    Prepared command = session.prepare(sql);
    if (sample > 0) {
        ArrayList<Parameter> params = command.getParameters();
        params.get(0).setValue(ValueInt.get(1));
        params.get(1).setValue(ValueInt.get(sample));
    }
    ResultInterface result = command.query(0);
    result.next();
    for (int j = 0; j < columns.length; j++) {
        Value v = result.currentRow()[j];
        if (v != ValueNull.INSTANCE) {
            int selectivity = v.getInt();
            columns[j].setSelectivity(selectivity);
        }
    }
    db.updateMeta(session, table);
}

Example 4 with ResultInterface

use of org.h2.result.ResultInterface in project h2database by h2database.

the class ExecuteProcedure method query.

@Override
public ResultInterface query(int limit) {
    setParameters();
    Prepared prepared = procedure.getPrepared();
    return prepared.query(limit);
}

Example 5 with ResultInterface

use of org.h2.result.ResultInterface in project h2database by h2database.

the class Replace method update.

@Override
public int update() {
    int count;
    session.getUser().checkRight(table, Right.INSERT);
    session.getUser().checkRight(table, Right.UPDATE);
    setCurrentRowNumber(0);
    if (!list.isEmpty()) {
        count = 0;
        for (int x = 0, size = list.size(); x < size; x++) {
            setCurrentRowNumber(x + 1);
            Expression[] expr = list.get(x);
            Row newRow = table.getTemplateRow();
            for (int i = 0, len = columns.length; i < len; i++) {
                Column c = columns[i];
                int index = c.getColumnId();
                Expression e = expr[i];
                if (e != null) {
                    // e can be null (DEFAULT)
                    try {
                        Value v = c.convert(e.getValue(session));
                        newRow.setValue(index, v);
                    } catch (DbException ex) {
                        throw setRow(ex, count, getSQL(expr));
                    }
                }
            }
            replace(newRow);
            count++;
        }
    } else {
        ResultInterface rows = query.query(0);
        count = 0;
        table.fire(session, Trigger.UPDATE | Trigger.INSERT, true);
        table.lock(session, true, false);
        while (rows.next()) {
            count++;
            Value[] r = rows.currentRow();
            Row newRow = table.getTemplateRow();
            setCurrentRowNumber(count);
            for (int j = 0; j < columns.length; j++) {
                Column c = columns[j];
                int index = c.getColumnId();
                try {
                    Value v = c.convert(r[j]);
                    newRow.setValue(index, v);
                } catch (DbException ex) {
                    throw setRow(ex, count, getSQL(r));
                }
            }
            replace(newRow);
        }
        rows.close();
        table.fire(session, Trigger.UPDATE | Trigger.INSERT, false);
    }
    return count;
}