org.h2.value

类 ValueNull

java.lang.Object

org.h2.value.VersionedValue<Value>

org.h2.value.Value

org.h2.value.ValueNull

所有已实现的接口:

HasSQL, Typed

public final class ValueNull
extends Value

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

字段概要

字段

限定符和类型	字段和说明
static ValueNull	INSTANCE The main NULL instance.

从类继承的字段 org.h2.value.Value

ARRAY, BIGINT, BINARY, BLOB, BOOLEAN, CHAR, CLOB, 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, MIN_LONG_DECIMAL, NULL, NUMERIC, REAL, ROW, SMALLINT, TIME, TIME_TZ, TIMESTAMP, TIMESTAMP_TZ, TINYINT, TYPE_COUNT, UNKNOWN, UUID, VARBINARY, VARCHAR, VARCHAR_IGNORECASE

从接口继承的字段 org.h2.util.HasSQL

ADD_PLAN_INFORMATION, DEFAULT_SQL_FLAGS, NO_CASTS, QUOTE_ONLY_WHEN_REQUIRED, REPLACE_LOBS_FOR_TRACE, TRACE_SQL_FLAGS

方法概要

限定符和类型	方法和说明
int	compareTypeSafe(Value v, CompareMode mode, CastDataProvider provider) 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.
boolean	equals(Object other) Check if the two values have the same hash code.
BigDecimal	getBigDecimal()
boolean	getBoolean() Returns this value as a Java boolean value.
byte	getByte() Returns this value as a Java byte value.
byte[]	getBytes()
double	getDouble() Returns this value as a Java double value.
float	getFloat() Returns this value as a Java float value.
InputStream	getInputStream()
InputStream	getInputStream(long oneBasedOffset, long length) Get the input stream
int	getInt() Returns this value as a Java int value.
long	getLong() Returns this value as a Java long value.
int	getMemory() Get the memory used by this object.
Reader	getReader()
Reader	getReader(long oneBasedOffset, long length) Get the reader
short	getShort() Returns this value as a Java short value.
StringBuilder	getSQL(StringBuilder builder, int sqlFlags) Appends the SQL statement of this object to the specified builder.
String	getString() Get the value as a string.
TypeInfo	getType() Returns the data type.
int	getValueType() Get the value type.
int	hashCode()

从类继承的方法 org.h2.value.Value

add, castTo, charLength, clearCache, compareTo, compareWithNull, convertForAssignTo, convertTo, convertTo, convertTo, convertTo, convertTo, convertToAnyArray, convertToAnyRow, convertToBigint, convertToBoolean, convertToChar, convertToDate, convertToDouble, convertToEnum, convertToGeometry, convertToInt, convertToInt, convertToJavaObject, convertToReal, convertToSmallint, convertToTinyint, convertToUuid, divide, getBytesNoCopy, getHigherOrder, getSignum, getTypeName, getUnsupportedExceptionForOperation, isFalse, isTrue, modulus, multiply, negate, octetLength, subtract, toString

从类继承的方法 org.h2.value.VersionedValue

getCommittedValue, getCurrentValue, getOperationId, isCommitted

从类继承的方法 java.lang.Object

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

从接口继承的方法 org.h2.util.HasSQL

getSQL, getTraceSQL

字段详细资料

INSTANCE

public static final ValueNull INSTANCE

The main NULL instance.

方法详细资料

getSQL

public StringBuilder getSQL(StringBuilder builder,
                            int sqlFlags)

从接口复制的说明: HasSQL

Appends the SQL statement of this object to the specified builder.

参数:

builder - string builder

sqlFlags - formatting flags

返回:

the specified string builder

getType

public TypeInfo getType()

从接口复制的说明: Typed

Returns the data type.

指定者:

getType 在接口中 Typed

指定者:

getType 在类中 Value

返回:

the data type

getValueType

public int getValueType()

从类复制的说明: Value

Get the value type.

指定者:

getValueType 在类中 Value

返回:

the value type

getMemory

public int getMemory()

从类复制的说明: Value

Get the memory used by this object.

覆盖:

getMemory 在类中 Value

返回:

the memory used in bytes

getString

public String getString()

从类复制的说明: Value

Get the value as a string.

指定者:

getString 在类中 Value

返回:

the string

getReader

public Reader getReader()

覆盖:

getReader 在类中 Value

getReader

public Reader getReader(long oneBasedOffset,
                        long length)

从类复制的说明: Value

Get the reader

覆盖:

getReader 在类中 Value

参数:

oneBasedOffset - the offset (1 means no offset)

length - the requested length

返回:

the new reader

getBytes

public byte[] getBytes()

覆盖:

getBytes 在类中 Value

getInputStream

public InputStream getInputStream()

覆盖:

getInputStream 在类中 Value

getInputStream

public InputStream getInputStream(long oneBasedOffset,
                                  long length)

从类复制的说明: Value

Get the input stream

覆盖:

getInputStream 在类中 Value

参数:

oneBasedOffset - the offset (1 means no offset)

length - the requested length

返回:

the new input stream

getBoolean

public boolean getBoolean()

从类复制的说明: Value

Returns this value as a Java boolean value.

覆盖:

getBoolean 在类中 Value

返回:

value

另请参阅:

Value.isTrue(), Value.isFalse()

getByte

public byte getByte()

从类复制的说明: Value

Returns this value as a Java byte value.

覆盖:

getByte 在类中 Value

返回:

value

getShort

public short getShort()

从类复制的说明: Value

Returns this value as a Java short value.

覆盖:

getShort 在类中 Value

返回:

value

getInt

public int getInt()

从类复制的说明: Value

Returns this value as a Java int value.

覆盖:

getInt 在类中 Value

返回:

value

getLong

public long getLong()

从类复制的说明: Value

Returns this value as a Java long value.

覆盖:

getLong 在类中 Value

返回:

value

getBigDecimal

public BigDecimal getBigDecimal()

覆盖:

getBigDecimal 在类中 Value

getFloat

public float getFloat()

从类复制的说明: Value

Returns this value as a Java float value.

覆盖:

getFloat 在类中 Value

返回:

value

getDouble

public double getDouble()

从类复制的说明: Value

Returns this value as a Java double value.

覆盖:

getDouble 在类中 Value

返回:

value

compareTypeSafe

public int compareTypeSafe(Value v,
                           CompareMode mode,
                           CastDataProvider provider)

从类复制的说明: Value

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

指定者:

compareTypeSafe 在类中 Value

参数:

v - the other value

mode - the compare mode

provider - the cast information provider

返回:

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

containsNull

public boolean containsNull()

从类复制的说明: Value

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

覆盖:

containsNull 在类中 Value

返回:

true if this value is NULL or contains NULL value

hashCode

public int hashCode()

指定者:

hashCode 在类中 Value

equals

public boolean equals(Object other)

从类复制的说明: 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.

指定者:

equals 在类中 Value

参数:

other - the other value

返回:

true if they are equal