Examples of org.lealone.value.Value

org.lealone.value.Value
This is the base class for all value classes. It provides conversion and comparison methods.

                if (!params) {
                    buff.append(" {");
                    params = true;
                }
                buff.appendExceptFirst(", ");
                Value v = p.getParamValue();
                buff.append(++i).append(": ").append(v.getTraceSQL());
            }
        }
        if (params) {
            buff.append('}');
        }

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        if (first) {
            // TODO optimization: this loops through NULL
            Cursor cursor = find(session, null, null);
            while (cursor.next()) {
                SearchRow row = cursor.getSearchRow();
                Value v = row.getValue(columnIds[0]);
                if (v != ValueNull.INSTANCE) {
                    return cursor;
                }
            }
            return cursor;
        }
        TreeNode x = root, n;
        while (x != null) {
            n = x.right;
            if (n == null) {
                break;
            }
            x = n;
        }
        TreeCursor cursor = new TreeCursor(this, x, null, null);
        if (x == null) {
            return cursor;
        }
        // TODO optimization: this loops through NULL elements
        do {
            SearchRow row = cursor.getSearchRow();
            if (row == null) {
                break;
            }
            Value v = row.getValue(columnIds[0]);
            if (v != ValueNull.INSTANCE) {
                return cursor;
            }
        } while (cursor.previous());
        return cursor;

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    public void truncate(Session session) {
        reset();
    }


    public void add(Session session, Row row) {
        Value key = row.getValue(indexColumn);
        Object old = rows.get(key);
        if (old != null) {
            // TODO index duplicate key for hash indexes: is this allowed?
            throw getDuplicateKeyException();
        }

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        ArrayList<Parameter> paramList = query.getParameters();
        if (originalParameters != null) {
            for (int i = 0, size = originalParameters.size(); i < size; i++) {
                Parameter orig = originalParameters.get(i);
                int idx = orig.getIndex();
                Value value = orig.getValue(session);
                setParameter(paramList, idx, value);
            }
        }
        int len;
        if (first != null) {
            len = first.getColumnCount();
        } else if (last != null) {
            len = last.getColumnCount();
        } else {
            len = 0;
        }
        int idx = originalParameters == null ? 0 : originalParameters.size();
        idx += view.getParameterOffset();
        for (int i = 0; i < len; i++) {
            if (first != null) {
                Value v = first.getValue(i);
                if (v != null) {
                    int x = idx++;
                    setParameter(paramList, x, v);
                }
            }
            // for equality, only one parameter is used (first == last)
            if (last != null && indexMasks[i] != IndexCondition.EQUALITY) {
                Value v = last.getValue(i);
                if (v != null) {
                    int x = idx++;
                    setParameter(paramList, x, v);
                }
            }

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    private void setKey(PreparedStatement prep, int start, Value[] current) throws SQLException {
        for (int i = 0, size = key.size(); i < size; i++) {
            String col = key.get(i);
            int idx = getColumnIndex(col);
            Value v = current[idx];
            if (v == null || v == ValueNull.INSTANCE) {
                // rows with a unique key containing NULL are not supported,
                // as multiple such rows could exist
                throw DbException.get(ErrorCode.NO_DATA_AVAILABLE);
            }
            v.set(prep, start + i);
        }
    }

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        // - like this optimistic ('no') locking is possible
        appendKeyCondition(buff);
        PreparedStatement prep = conn.prepareStatement(buff.toString());
        int j = 1;
        for (int i = 0; i < columnCount; i++) {
            Value v = updateRow[i];
            if (v == null) {
                v = current[i];
            }
            v.set(prep, j++);
        }
        setKey(prep, j, current);
        int count = prep.executeUpdate();
        if (count != 1) {
            // the row has been deleted

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        appendColumnList(buff, false);
        buff.append(")VALUES(");
        buff.resetCount();
        for (int i = 0; i < columnCount; i++) {
            buff.appendExceptFirst(",");
            Value v = row[i];
            if (v == null) {
                buff.append("DEFAULT");
            } else {
                buff.append('?');
            }
        }
        buff.append(')');
        PreparedStatement prep = conn.prepareStatement(buff.toString());
        for (int i = 0, j = 0; i < columnCount; i++) {
            Value v = row[i];
            if (v != null) {
                v.set(prep, j++ + 1);
            }
        }
        int count = prep.executeUpdate();
        if (count != 1) {
            throw DbException.get(ErrorCode.NO_DATA_AVAILABLE);

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                        break;
                    }
                    int len = columns.length;
                    Value[] values = new Value[len];
                    for (int i = 0; i < len; i++) {
                        Value v = transfer.readValue();
                        values[i] = v;
                    }
                    result.add(values);
                }
                if (rowOffset + result.size() >= rowCount) {

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     *             closed
     */
    public Object getObject(int columnIndex) throws SQLException {
        try {
            debugCodeCall("getObject", columnIndex);
            Value v = get(columnIndex);
            return conn.convertToDefaultObject(v);
        } catch (Exception e) {
            throw logAndConvert(e);
        }
    }

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     *             closed
     */
    public Object getObject(String columnLabel) throws SQLException {
        try {
            debugCodeCall("getObject", columnLabel);
            Value v = get(columnLabel);
            return conn.convertToDefaultObject(v);
        } catch (Exception e) {
            throw logAndConvert(e);
        }
    }

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Related Classes of org.lealone.value.Value

org.lealone.command.CommandContainer

org.lealone.command.CommandRemote

org.lealone.command.ddl.CreateConstant

org.lealone.command.dml.Call

org.lealone.command.dml.Delete

org.lealone.command.dml.Insert

org.lealone.command.dml.Merge

org.lealone.command.dml.Query

org.lealone.command.dml.ScriptCommand

org.lealone.command.dml.Select

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