Examples of org.lealone.value.ValueLob

org.lealone.value.ValueLob
Implementation of the BLOB and CLOB data types. Small objects are kept in memory and stored in the record. Large objects are stored in their own files. When large objects are set in a prepared statement, they are first stored as 'temporary' files. Later, when they are used in a record, and when the record is stored, the lob files are linked: the file is renamed using the file format (tableId).(objectId). There is one exception: large variables are stored in the file (-1).(objectId). When lobs are deleted, they are first renamed to a temp file, and if the delete operation is committed the file is deleted. Data compression is supported.

        }
        case Value.BLOB:
        case Value.CLOB: {
            writeByte((byte) type);
            if (v instanceof ValueLob) {
                ValueLob lob = (ValueLob) v;
                lob.convertToFileIfRequired(handler);
                byte[] small = lob.getSmall();
                if (small == null) {
                    int t = -1;
                    if (!lob.isLinked()) {
                        t = -2;
                    }
                    writeVarInt(t);
                    writeVarInt(lob.getTableId());
                    writeVarInt(lob.getObjectId());
                    writeVarLong(lob.getPrecision());
                    writeByte((byte) (lob.useCompression() ? 1 : 0));
                    if (t == -2) {
                        writeString(lob.getFileName());
                    }
                } else {
                    writeVarInt(small.length);
                    write(small, 0, small.length);
                }
            } else {
                ValueLobDb lob = (ValueLobDb) v;
                byte[] small = lob.getSmall();
                if (small == null) {
                    writeVarInt(-3);
                    writeVarInt(lob.getTableId());
                    writeVarLong(lob.getLobId());
                    writeVarLong(lob.getPrecision());
                } else {
                    writeVarInt(small.length);
                    write(small, 0, small.length);
                }
            }

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                // -2: regular, but not linked (in this case: including file name)
                if (smallLen == -1 || smallLen == -2) {
                    precision = readVarLong();
                    compression = readByte() == 1;
                }
                ValueLob lob = ValueLob.open(type, handler, tableId, objectId, precision, compression);
                if (smallLen == -2) {
                    lob.setFileName(readString(), false);
                }
                return lob;
            }
        }
        case Value.ARRAY: {

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            return 1 + LENGTH_LONG + LENGTH_LONG;
        case Value.BLOB:
        case Value.CLOB: {
            int len = 1;
            if (v instanceof ValueLob) {
                ValueLob lob = (ValueLob) v;
                lob.convertToFileIfRequired(handler);
                byte[] small = lob.getSmall();
                if (small == null) {
                    int t = -1;
                    if (!lob.isLinked()) {
                        t = -2;
                    }
                    len += getVarIntLen(t);
                    len += getVarIntLen(lob.getTableId());
                    len += getVarIntLen(lob.getObjectId());
                    len += getVarLongLen(lob.getPrecision());
                    len += 1;
                    if (t == -2) {
                        len += getStringLen(lob.getFileName());
                    }
                } else {
                    len += getVarIntLen(small.length);
                    len += small.length;
                }
            } else {
                ValueLobDb lob = (ValueLobDb) v;
                byte[] small = lob.getSmall();
                if (small == null) {
                    len += getVarIntLen(-3);
                    len += getVarIntLen(lob.getTableId());
                    len += getVarLongLen(lob.getLobId());
                    len += getVarLongLen(lob.getPrecision());
                } else {
                    len += getVarIntLen(small.length);
                    len += small.length;
                }
            }

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Related Classes of org.lealone.value.ValueLob

org.lealone.store.Data

org.lealone.store.FileStore

org.lealone.store.FileStoreInputStream

org.lealone.store.FileStoreOutputStream

java.io.ByteArrayInputStream

java.io.BufferedInputStream

java.io.File

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