Examples with ValueResultSet org.h2.value.ValueResultSet used on opensource projects

Example 6 with ValueResultSet

use of org.h2.value.ValueResultSet in project h2database by h2database.

the class ValueDataType method writeValue.

private void writeValue(WriteBuffer buff, Value v) {
    if (v == ValueNull.INSTANCE) {
        buff.put((byte) 0);
        return;
    }
    int type = v.getType();
    switch(type) {
        case Value.BOOLEAN:
            buff.put((byte) (v.getBoolean() ? BOOLEAN_TRUE : BOOLEAN_FALSE));
            break;
        case Value.BYTE:
            buff.put((byte) type).put(v.getByte());
            break;
        case Value.SHORT:
            buff.put((byte) type).putShort(v.getShort());
            break;
        case Value.ENUM:
        case Value.INT:
            {
                int x = v.getInt();
                if (x < 0) {
                    buff.put((byte) INT_NEG).putVarInt(-x);
                } else if (x < 16) {
                    buff.put((byte) (INT_0_15 + x));
                } else {
                    buff.put((byte) type).putVarInt(x);
                }
                break;
            }
        case Value.LONG:
            {
                long x = v.getLong();
                if (x < 0) {
                    buff.put((byte) LONG_NEG).putVarLong(-x);
                } else if (x < 8) {
                    buff.put((byte) (LONG_0_7 + x));
                } else {
                    buff.put((byte) type).putVarLong(x);
                }
                break;
            }
        case Value.DECIMAL:
            {
                BigDecimal x = v.getBigDecimal();
                if (BigDecimal.ZERO.equals(x)) {
                    buff.put((byte) DECIMAL_0_1);
                } else if (BigDecimal.ONE.equals(x)) {
                    buff.put((byte) (DECIMAL_0_1 + 1));
                } else {
                    int scale = x.scale();
                    BigInteger b = x.unscaledValue();
                    int bits = b.bitLength();
                    if (bits <= 63) {
                        if (scale == 0) {
                            buff.put((byte) DECIMAL_SMALL_0).putVarLong(b.longValue());
                        } else {
                            buff.put((byte) DECIMAL_SMALL).putVarInt(scale).putVarLong(b.longValue());
                        }
                    } else {
                        byte[] bytes = b.toByteArray();
                        buff.put((byte) type).putVarInt(scale).putVarInt(bytes.length).put(bytes);
                    }
                }
                break;
            }
        case Value.TIME:
            {
                ValueTime t = (ValueTime) v;
                long nanos = t.getNanos();
                long millis = nanos / 1000000;
                nanos -= millis * 1000000;
                buff.put((byte) type).putVarLong(millis).putVarLong(nanos);
                break;
            }
        case Value.DATE:
            {
                long x = ((ValueDate) v).getDateValue();
                buff.put((byte) type).putVarLong(x);
                break;
            }
        case Value.TIMESTAMP:
            {
                ValueTimestamp ts = (ValueTimestamp) v;
                long dateValue = ts.getDateValue();
                long nanos = ts.getTimeNanos();
                long millis = nanos / 1000000;
                nanos -= millis * 1000000;
                buff.put((byte) type).putVarLong(dateValue).putVarLong(millis).putVarLong(nanos);
                break;
            }
        case Value.TIMESTAMP_TZ:
            {
                ValueTimestampTimeZone ts = (ValueTimestampTimeZone) v;
                long dateValue = ts.getDateValue();
                long nanos = ts.getTimeNanos();
                long millis = nanos / 1000000;
                nanos -= millis * 1000000;
                buff.put((byte) type).putVarLong(dateValue).putVarLong(millis).putVarLong(nanos).putVarInt(ts.getTimeZoneOffsetMins());
                break;
            }
        case Value.JAVA_OBJECT:
            {
                byte[] b = v.getBytesNoCopy();
                buff.put((byte) type).putVarInt(b.length).put(b);
                break;
            }
        case Value.BYTES:
            {
                byte[] b = v.getBytesNoCopy();
                int len = b.length;
                if (len < 32) {
                    buff.put((byte) (BYTES_0_31 + len)).put(b);
                } else {
                    buff.put((byte) type).putVarInt(b.length).put(b);
                }
                break;
            }
        case Value.UUID:
            {
                ValueUuid uuid = (ValueUuid) v;
                buff.put((byte) type).putLong(uuid.getHigh()).putLong(uuid.getLow());
                break;
            }
        case Value.STRING:
            {
                String s = v.getString();
                int len = s.length();
                if (len < 32) {
                    buff.put((byte) (STRING_0_31 + len)).putStringData(s, len);
                } else {
                    buff.put((byte) type);
                    writeString(buff, s);
                }
                break;
            }
        case Value.STRING_IGNORECASE:
        case Value.STRING_FIXED:
            buff.put((byte) type);
            writeString(buff, v.getString());
            break;
        case Value.DOUBLE:
            {
                double x = v.getDouble();
                if (x == 1.0d) {
                    buff.put((byte) (DOUBLE_0_1 + 1));
                } else {
                    long d = Double.doubleToLongBits(x);
                    if (d == ValueDouble.ZERO_BITS) {
                        buff.put((byte) DOUBLE_0_1);
                    } else {
                        buff.put((byte) type).putVarLong(Long.reverse(d));
                    }
                }
                break;
            }
        case Value.FLOAT:
            {
                float x = v.getFloat();
                if (x == 1.0f) {
                    buff.put((byte) (FLOAT_0_1 + 1));
                } else {
                    int f = Float.floatToIntBits(x);
                    if (f == ValueFloat.ZERO_BITS) {
                        buff.put((byte) FLOAT_0_1);
                    } else {
                        buff.put((byte) type).putVarInt(Integer.reverse(f));
                    }
                }
                break;
            }
        case Value.BLOB:
        case Value.CLOB:
            {
                buff.put((byte) type);
                ValueLobDb lob = (ValueLobDb) v;
                byte[] small = lob.getSmall();
                if (small == null) {
                    buff.putVarInt(-3).putVarInt(lob.getTableId()).putVarLong(lob.getLobId()).putVarLong(lob.getPrecision());
                } else {
                    buff.putVarInt(small.length).put(small);
                }
                break;
            }
        case Value.ARRAY:
            {
                Value[] list = ((ValueArray) v).getList();
                buff.put((byte) type).putVarInt(list.length);
                for (Value x : list) {
                    writeValue(buff, x);
                }
                break;
            }
        case Value.RESULT_SET:
            {
                buff.put((byte) type);
                try {
                    ResultSet rs = ((ValueResultSet) v).getResultSet();
                    rs.beforeFirst();
                    ResultSetMetaData meta = rs.getMetaData();
                    int columnCount = meta.getColumnCount();
                    buff.putVarInt(columnCount);
                    for (int i = 0; i < columnCount; i++) {
                        writeString(buff, meta.getColumnName(i + 1));
                        buff.putVarInt(meta.getColumnType(i + 1)).putVarInt(meta.getPrecision(i + 1)).putVarInt(meta.getScale(i + 1));
                    }
                    while (rs.next()) {
                        buff.put((byte) 1);
                        for (int i = 0; i < columnCount; i++) {
                            int t = org.h2.value.DataType.getValueTypeFromResultSet(meta, i + 1);
                            Value val = org.h2.value.DataType.readValue(null, rs, i + 1, t);
                            writeValue(buff, val);
                        }
                    }
                    buff.put((byte) 0);
                    rs.beforeFirst();
                } catch (SQLException e) {
                    throw DbException.convert(e);
                }
                break;
            }
        case Value.GEOMETRY:
            {
                byte[] b = v.getBytes();
                int len = b.length;
                buff.put((byte) type).putVarInt(len).put(b);
                break;
            }
        default:
            if (JdbcUtils.customDataTypesHandler != null) {
                byte[] b = v.getBytesNoCopy();
                buff.put((byte) CUSTOM_DATA_TYPE).putVarInt(type).putVarInt(b.length).put(b);
                break;
            }
            DbException.throwInternalError("type=" + v.getType());
    }
}

Example 7 with ValueResultSet

use of org.h2.value.ValueResultSet in project h2database by h2database.

the class ValueResultSet method getCopy.

/**
 * Create a result set value for the given result set. The result set will
 * be fully read in memory. The original result set is not closed.
 *
 * @param rs the result set
 * @param maxrows the maximum number of rows to read (0 to just read the
 *            meta data)
 * @return the value
 */
public static ValueResultSet getCopy(ResultSet rs, int maxrows) {
    try {
        ResultSetMetaData meta = rs.getMetaData();
        int columnCount = meta.getColumnCount();
        SimpleResultSet simple = new SimpleResultSet();
        simple.setAutoClose(false);
        ValueResultSet val = new ValueResultSet(simple);
        for (int i = 0; i < columnCount; i++) {
            String name = meta.getColumnLabel(i + 1);
            int sqlType = meta.getColumnType(i + 1);
            int precision = meta.getPrecision(i + 1);
            int scale = meta.getScale(i + 1);
            simple.addColumn(name, sqlType, precision, scale);
        }
        for (int i = 0; i < maxrows && rs.next(); i++) {
            Object[] list = new Object[columnCount];
            for (int j = 0; j < columnCount; j++) {
                list[j] = rs.getObject(j + 1);
            }
            simple.addRow(list);
        }
        return val;
    } catch (SQLException e) {
        throw DbException.convert(e);
    }
}