org.h2.value

Class ValueNull

java.lang.Object

org.h2.value.VersionedValue

org.h2.value.Value

org.h2.value.ValueNull

public class ValueNull
extends Value

Implementation of NULL. NULL is not a regular data type.

Field Summary

Fields

Modifier and Type	Field and Description
static ValueNull	DELETED This special instance is used as a marker for deleted entries in a map.
static ValueNull	INSTANCE The main NULL instance.

Fields inherited from class org.h2.value.Value

ARRAY, BLOB, BOOLEAN, BYTE, BYTES, CLOB, DATE, DECIMAL, DOUBLE, ENUM, FLOAT, GEOMETRY, INT, 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, LONG, MIN_LONG_DECIMAL, NULL, RESULT_SET, ROW, SHORT, STRING, STRING_FIXED, STRING_IGNORECASE, TIME, TIMESTAMP, TIMESTAMP_TZ, TYPE_COUNT, UNKNOWN, UUID

Fields inherited from class org.h2.value.VersionedValue

DUMMY

Method Summary

Methods

Modifier and Type	Method and Description
int	compareTypeSafe(Value v, CompareMode mode) Compare this value against another value given that the values are of the same data type.
boolean	containsNull() Returns true if this value is NULL or contains NULL value.
protected Value	convertTo(int type, Mode mode, java.lang.Object column, ExtTypeInfo extTypeInfo) Convert a value to the specified type.
boolean	equals(java.lang.Object other) Check if the two values have the same hash code.
java.math.BigDecimal	getBigDecimal()
boolean	getBoolean()
byte	getByte()
byte[]	getBytes()
java.sql.Date	getDate()
double	getDouble()
float	getFloat()
java.io.InputStream	getInputStream()
int	getInt()
long	getLong()
int	getMemory() Get the memory used by this object.
java.lang.Object	getObject() Get the value as an object.
java.io.Reader	getReader()
short	getShort()
java.lang.StringBuilder	getSQL(java.lang.StringBuilder builder) Appends the SQL expression for this value to the specified builder.
java.lang.String	getString() Get the value as a string.
java.sql.Time	getTime()
java.sql.Timestamp	getTimestamp()
TypeInfo	getType() Returns the data type.
int	getValueType() Get the value type.
int	hashCode()
void	set(java.sql.PreparedStatement prep, int parameterIndex) Set the value as a parameter in a prepared statement.

Methods inherited from class org.h2.value.Value

add, checkPrecision, clearCache, compareTo, compareWithNull, convertPrecision, convertScale, convertTo, convertTo, convertTo, convertToInt, copy, copyToResult, copyToTemp, divide, getBytesNoCopy, getDataHandler, getHigherOrder, getHigherType, getInputStream, getReader, getResult, getSignum, getSmall, getSQL, getTableId, getTraceSQL, getUnsupportedExceptionForOperation, isLinkedToTable, modulus, multiply, negate, remove, 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

Field Detail

INSTANCE

public static final ValueNull INSTANCE

The main NULL instance.

DELETED

public static final ValueNull DELETED

This special instance is used as a marker for deleted entries in a map. It should not be used anywhere else.

Method Detail

getSQL

public java.lang.StringBuilder getSQL(java.lang.StringBuilder builder)

Description copied from class: Value

Appends the SQL expression for this value to the specified builder.

Specified by:

getSQL in class Value

Parameters:

builder - string builder

Returns:

the specified string builder

getType

public TypeInfo getType()

Description copied from class: Value

Returns the data type.

Specified by:

getType in class Value

Returns:

the data type

getValueType

public int getValueType()

Description copied from class: Value

Get the value type.

Specified by:

getValueType in class Value

Returns:

the value type

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

getString

public java.lang.String getString()

Description copied from class: Value

Get the value as a string.

Specified by:

getString in class Value

Returns:

the string

getBoolean

public boolean getBoolean()

Overrides:

getBoolean in class Value

getDate

public java.sql.Date getDate()

Overrides:

getDate in class Value

getTime

public java.sql.Time getTime()

Overrides:

getTime in class Value

getTimestamp

public java.sql.Timestamp getTimestamp()

Overrides:

getTimestamp in class Value

getBytes

public byte[] getBytes()

Overrides:

getBytes in class Value

getByte

public byte getByte()

Overrides:

getByte in class Value

getShort

public short getShort()

Overrides:

getShort in class Value

getBigDecimal

public java.math.BigDecimal getBigDecimal()

Overrides:

getBigDecimal in class Value

getDouble

public double getDouble()

Overrides:

getDouble in class Value

getFloat

public float getFloat()

Overrides:

getFloat in class Value

getInt

public int getInt()

Overrides:

getInt in class Value

getLong

public long getLong()

Overrides:

getLong in class Value

getInputStream

public java.io.InputStream getInputStream()

Overrides:

getInputStream in class Value

getReader

public java.io.Reader getReader()

Overrides:

getReader in class Value

convertTo

protected Value convertTo(int type,
              Mode mode,
              java.lang.Object column,
              ExtTypeInfo extTypeInfo)

Description copied from class: Value

Convert a value to the specified type.

Overrides:

convertTo in class Value

Parameters:

type - the type of the returned value

mode - the conversion mode

column - the column (if any), used for to improve the error message if conversion fails

extTypeInfo - the extended data type information, or null

Returns:

the converted value

compareTypeSafe

public int compareTypeSafe(Value v,
                  CompareMode mode)

Description copied from class: Value

Compare this value against another value given that the values are of the same data type.

Specified by:

compareTypeSafe in class Value

Parameters:

v - the other value

mode - the compare mode

Returns:

0 if both values are equal, -1 if the other value is smaller, and 1 otherwise

containsNull

public boolean containsNull()

Description copied from class: Value

Returns true if this value is NULL or contains NULL value.

Overrides:

containsNull in class Value

Returns:

true if this value is NULL or contains NULL value

hashCode

public int hashCode()

Specified by:

hashCode in class Value

getObject

public java.lang.Object getObject()

Description copied from class: Value

Get the value as an object.

Specified by:

getObject in class Value

Returns:

the object

set

public void set(java.sql.PreparedStatement prep,
       int parameterIndex)
         throws java.sql.SQLException

Description copied from class: Value

Set the value as a parameter in a prepared statement.

Specified by:

set in class Value

Parameters:

prep - the prepared statement

parameterIndex - the parameter index

Throws:

java.sql.SQLException

equals

public boolean equals(java.lang.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