Package org.h2.value

Class ValueLob

java.lang.Object

org.h2.value.VersionedValue<Value>

org.h2.value.Value

org.h2.value.ValueLob

All Implemented Interfaces:

HasSQL, Typed

Direct Known Subclasses:

ValueBlob, ValueClob

public abstract class ValueLob
extends Value

A implementation of the BINARY LARGE OBJECT and CHARACTER LARGE OBJECT data types. Small objects are kept in memory and stored in the record. Large objects are either stored in the database, or in temporary files.

Field Summary

Fields inherited from class org.h2.value.Value

ARRAY, ASSIGN_TO, BIGINT, BINARY, BLOB, BOOLEAN, CAST_TO, CHAR, CLOB, CONVERT_TO, DATE, DECFLOAT, DOUBLE, EMPTY_VALUES, ENUM, GEOMETRY, INTEGER, INTERVAL_DAY, INTERVAL_DAY_TO_HOUR, INTERVAL_DAY_TO_MINUTE, INTERVAL_DAY_TO_SECOND, INTERVAL_HOUR, INTERVAL_HOUR_TO_MINUTE, INTERVAL_HOUR_TO_SECOND, INTERVAL_MINUTE, INTERVAL_MINUTE_TO_SECOND, INTERVAL_MONTH, INTERVAL_SECOND, INTERVAL_YEAR, INTERVAL_YEAR_TO_MONTH, JAVA_OBJECT, JSON, MAX_LONG_DECIMAL, MIN_LONG_DECIMAL, NULL, NUMERIC, REAL, ROW, SMALLINT, TIME, TIME_TZ, TIMESTAMP, TIMESTAMP_TZ, TINYINT, TYPE_COUNT, UNKNOWN, UUID, VARBINARY, VARCHAR, VARCHAR_IGNORECASE

Fields inherited from interface org.h2.util.HasSQL

ADD_PLAN_INFORMATION, DEFAULT_SQL_FLAGS, NO_CASTS, QUOTE_ONLY_WHEN_REQUIRED, REPLACE_LOBS_FOR_TRACE, TRACE_SQL_FLAGS

Method Summary

Modifier and Type	Method	Description
abstract ValueLob	copy(DataHandler database, int tableId)	Copy a large value, to be used in the given table.
ValueLob	copyToResult()	Create an independent copy of this value, that will be bound to a result.
boolean	equals(Object other)	Check if the two values have the same hash code.
byte[]	getBytes()
byte[]	getBytesNoCopy()
LobData	getLobData()
int	getMemory()	Get the memory used by this object.
Reader	getReader()
TypeInfo	getType()	Returns the data type.
int	hashCode()
boolean	isLinkedToTable()	Check if this value is linked to a specific table.
protected static InputStream	rangeInputStream(InputStream inputStream, long oneBasedOffset, long length, long dataSize)	Create an input stream that is s subset of the given stream.
void	remove()	Remove the underlying resource, if any.

Methods inherited from class org.h2.value.Value

add, castTo, charLength, clearCache, compareTo, compareTypeSafe, compareWithNull, containsNull, convertForAssignTo, convertTo, convertTo, convertTo, convertTo, convertTo, convertToAnyArray, convertToAnyJson, convertToAnyRow, convertToBigint, convertToBoolean, convertToChar, convertToDate, convertToDouble, convertToEnum, convertToGeometry, convertToInt, convertToInt, convertToJavaObject, convertToJson, convertToReal, convertToSmallint, convertToTinyint, convertToUuid, divide, getBigDecimal, getBoolean, getByte, getDouble, getFloat, getHigherOrder, getInputStream, getInputStream, getInt, getLong, getReader, getShort, getSignum, getString, getTypeName, getUnsupportedExceptionForOperation, getValueType, getValueWithFirstNull, isFalse, isTrue, modulus, multiply, negate, octetLength, subtract, toString

Methods inherited from class org.h2.value.VersionedValue

getCommittedValue, getCurrentValue, getOperationId, isCommitted

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.h2.util.HasSQL

getSQL, getSQL, getTraceSQL

Method Details

rangeInputStream

protected static InputStream rangeInputStream(InputStream inputStream,
 long oneBasedOffset,
 long length,
 long dataSize)

Create an input stream that is s subset of the given stream.

Parameters:

inputStream - the source input stream

oneBasedOffset - the offset (1 means no offset)

length - the length of the result, in bytes

dataSize - the length of the input, in bytes

Returns:

the smaller input stream

isLinkedToTable

public boolean isLinkedToTable()

Check if this value is linked to a specific table. For values that are kept fully in memory, this method returns false.

Returns:

true if it is

remove

public void remove()

Remove the underlying resource, if any. For values that are kept fully in memory this method has no effect.

copy

public abstract ValueLob copy(DataHandler database,
 int tableId)

Copy a large value, to be used in the given table. For values that are kept fully in memory this method has no effect.

Parameters:

database - the data handler

tableId - the table where this object is used

Returns:

the new value or itself

getType

public TypeInfo getType()

Description copied from interface: Typed

Returns the data type.

Specified by:

getType in interface Typed

Specified by:

getType in class Value

Returns:

the data type

getReader

public Reader getReader()

Overrides:

getReader in class Value

getBytes

public byte[] getBytes()

Overrides:

getBytes in class Value

getBytesNoCopy

public byte[] getBytesNoCopy()

Overrides:

getBytesNoCopy in class Value

hashCode

public int hashCode()

Specified by:

hashCode in class Value

equals

public boolean equals(Object other)

Description copied from class: Value

Check if the two values have the same hash code. No data conversion is made; this method returns false if the other object is not of the same class. For some values, compareTo may return 0 even if equals return false. Example: ValueDecimal 0.0 and 0.00.

Specified by:

equals in class Value

Parameters:

other - the other value

Returns:

true if they are equal

getMemory

public int getMemory()

Description copied from class: Value

Get the memory used by this object.

Overrides:

getMemory in class Value

Returns:

the memory used in bytes

getLobData

public LobData getLobData()

copyToResult

public ValueLob copyToResult()

Create an independent copy of this value, that will be bound to a result.

Returns:

the value (this for small objects)