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Java Source Code / Java Documentation » Database DBMS » db derby 10.2 » org.apache.derby.iapi.types

Source Cross Reference

Class Diagram

Java Document (Java Doc)

java.lang .Object

org.apache.derby.iapi.types .DataType

org.apache.derby.iapi.types .NumberDataType

org.apache.derby.iapi.types .SQLReal

SQLReal

final public class SQLReal extends NumberDataType (Code)

SQLReal satisfies the DataValueDescriptor interfaces (i.e., OrderableDataType). It implements a real column, e.g. for storing a column value; it can be specified when constructed to not allow nulls. Nullability cannot be changed after construction, as it affects the storage size and mechanism.

Because OrderableDataType is a subtype of ValueColumn, SQLReal can play a role in either a ValueColumn/Row or a OrderableDataType/Row, interchangeably.

We assume the store has a flag for nullness of the value, and simply return a 0-length array for the stored form when the value is null.

PERFORMANCE: There are likely alot of performance improvements possible for this implementation -- it new's Float more than it probably wants to.

This is called SQLReal even though it maps to the Java float type, to avoid confusion with whether it maps to the SQL float type or not. It doesn't, it maps to the SQL real type.

This is modeled after SQLSmallint.
See Also: SQLSmallint
author:
ames

Field Summary
final static int	REAL_LENGTH

Constructor Summary
public	SQLReal() no-arg constructor, required by Formattable.
public	SQLReal(float val)
public	SQLReal(Float obj)

Method Summary
public NumberDataValue	divide(NumberDataValue dividend, NumberDataValue divisor, NumberDataValue result) This method implements the / operator for "real / real".
public BooleanDataValue	equals(DataValueDescriptor left, DataValueDescriptor right) The = operator as called from the language module, as opposed to the storage module.
public int	estimateMemoryUsage()
public boolean	getBoolean()
public byte	getByte()
public DataValueDescriptor	getClone()
public double	getDouble()
public float	getFloat()
public int	getInt()
public int	getLength()
public long	getLong()
public DataValueDescriptor	getNewNull()
public Object	getObject()
public short	getShort()
public String	getString()
public int	getTypeFormatId() Return my format identifier.
public String	getTypeName()
public BooleanDataValue	greaterOrEquals(DataValueDescriptor left, DataValueDescriptor right) The >= operator as called from the language module, as opposed to the storage module.
public BooleanDataValue	greaterThan(DataValueDescriptor left, DataValueDescriptor right) The > operator as called from the language module, as opposed to the storage module.
public int	hashCode()
protected boolean	isNegative() This method implements the isNegative method. Note: This method will return true for -0.0f. A boolean.
public boolean	isNull()
public BooleanDataValue	lessOrEquals(DataValueDescriptor left, DataValueDescriptor right) The <= operator as called from the language module, as opposed to the storage module.
public BooleanDataValue	lessThan(DataValueDescriptor left, DataValueDescriptor right) The < operator as called from the language module, as opposed to the storage module.
public NumberDataValue	minus(NumberDataValue left, NumberDataValue right, NumberDataValue result) This method implements the - operator for "real - real".
public NumberDataValue	minus(NumberDataValue result) This method implements the unary minus operator for real.
public BooleanDataValue	notEquals(DataValueDescriptor left, DataValueDescriptor right) The <> operator as called from the language module, as opposed to the storage module.
public NumberDataValue	plus(NumberDataValue addend1, NumberDataValue addend2, NumberDataValue result) This method implements the + operator for "real + real".
public void	readExternal(ObjectInput in)
public void	readExternalFromArray(ArrayInputStream in)
public void	restoreToNull()
public void	setBigDecimal(Number bigDecimal)
protected void	setFrom(DataValueDescriptor theValue)
final public void	setInto(PreparedStatement ps, int position) Set the value into a PreparedStatement.
final public void	setInto(ResultSet rs, int position) Set this value into a ResultSet for a subsequent ResultSet.insertRow or ResultSet.updateRow.
void	setObject(Object theValue) Set the value from a correctly typed Float object.
public void	setValue(String theValue)
public void	setValue(Number theValue)
public void	setValue(float theValue)
public void	setValue(int theValue)
public void	setValue(long theValue)
public void	setValue(double theValue)
public void	setValue(boolean theValue)
public void	setValueFromResultSet(ResultSet resultSet, int colNumber, boolean isNullable)
public NumberDataValue	times(NumberDataValue left, NumberDataValue right, NumberDataValue result) This method implements the * operator for "real * real".
public String	toString()
protected int	typeCompare(DataValueDescriptor arg)
public int	typePrecedence()
public int	typeToBigDecimal() DOUBLE implementation.
public void	writeExternal(ObjectOutput out)

Field Detail

REAL_LENGTH
final static int REAL_LENGTH(Code)

Constructor Detail

SQLReal
public SQLReal()(Code)
	no-arg constructor, required by Formattable.

SQLReal
public SQLReal(float val) throws StandardException(Code)

SQLReal
public SQLReal(Float obj) throws StandardException(Code)

Method Detail

divide
public NumberDataValue divide(NumberDataValue dividend, NumberDataValue divisor, NumberDataValue result) throws StandardException(Code)
	This method implements the / operator for "real / real". The operator uses DOUBLE aritmetic as DB2 does. Parameters: dividend - The numerator Parameters: divisor - The denominator Parameters: result - The result of a previous call to this method, nullif not called yet A SQLReal containing the result of the division exception: StandardException - Thrown on error

equals
public BooleanDataValue equals(DataValueDescriptor left, DataValueDescriptor right) throws StandardException(Code)
	The = operator as called from the language module, as opposed to the storage module. Parameters: left - The value on the left side of the = Parameters: right - The value on the right side of the = A SQL boolean value telling whether the two parameters are equal exception: StandardException - Thrown on error

estimateMemoryUsage
public int estimateMemoryUsage()(Code)

getBoolean
public boolean getBoolean()(Code)
	See Also: DataValueDescriptor.getBoolean See Also:

getByte
public byte getByte() throws StandardException(Code)
	See Also: DataValueDescriptor.getByte See Also: exception: StandardException - thrown on failure to convert

getClone
public DataValueDescriptor getClone()(Code)
	See Also: DataValueDescriptor.getClone See Also:

getDouble
public double getDouble()(Code)
	See Also: DataValueDescriptor.getDouble See Also:

getFloat
public float getFloat()(Code)
	See Also: DataValueDescriptor.getFloat See Also:

getInt
public int getInt() throws StandardException(Code)
	See Also: DataValueDescriptor.getInt See Also: exception: StandardException - thrown on failure to convert

getLength
public int getLength()(Code)
	See Also: DataValueDescriptor.getLength See Also:

getLong
public long getLong() throws StandardException(Code)
	See Also: DataValueDescriptor.getLong See Also: exception: StandardException - thrown on failure to convert

getNewNull
public DataValueDescriptor getNewNull()(Code)
	See Also: DataValueDescriptor.getNewNull

getObject
public Object getObject()(Code)
	See Also: DataValueDescriptor.getObject See Also:

getShort
public short getShort() throws StandardException(Code)
	exception: StandardException - thrown on failure to convert See Also: DataValueDescriptor.getShort See Also:

getString
public String getString()(Code)
	See Also: DataValueDescriptor.getString See Also:

getTypeFormatId
public int getTypeFormatId()(Code)
	Return my format identifier. See Also: org.apache.derby.iapi.services.io.TypedFormat.getTypeFormatId

getTypeName
public String getTypeName()(Code)

greaterOrEquals
public BooleanDataValue greaterOrEquals(DataValueDescriptor left, DataValueDescriptor right) throws StandardException(Code)
	The >= operator as called from the language module, as opposed to the storage module. Parameters: left - The value on the left side of the >= Parameters: right - The value on the right side of the >= A SQL boolean value telling whether the first operand is greaterthan or equal to the second operand exception: StandardException - Thrown on error

greaterThan
public BooleanDataValue greaterThan(DataValueDescriptor left, DataValueDescriptor right) throws StandardException(Code)
	The > operator as called from the language module, as opposed to the storage module. Parameters: left - The value on the left side of the > Parameters: right - The value on the right side of the > A SQL boolean value telling whether the first operand is greaterthan the second operand exception: StandardException - Thrown on error

hashCode
public int hashCode()(Code)

isNegative
protected boolean isNegative()(Code)
	This method implements the isNegative method. Note: This method will return true for -0.0f. A boolean. If this.value is negative, return true.For positive values or null, return false.

isNull
public boolean isNull()(Code)
	See Also: Storable.isNull See Also:

lessOrEquals
public BooleanDataValue lessOrEquals(DataValueDescriptor left, DataValueDescriptor right) throws StandardException(Code)
	The <= operator as called from the language module, as opposed to the storage module. Parameters: left - The value on the left side of the <= Parameters: right - The value on the right side of the <= A SQL boolean value telling whether the first operand is lessthan or equal to the second operand exception: StandardException - Thrown on error

lessThan
public BooleanDataValue lessThan(DataValueDescriptor left, DataValueDescriptor right) throws StandardException(Code)
	The < operator as called from the language module, as opposed to the storage module. Parameters: left - The value on the left side of the < Parameters: right - The value on the right side of the < A SQL boolean value telling whether the first operand is lessthan the second operand exception: StandardException - Thrown on error

minus
public NumberDataValue minus(NumberDataValue left, NumberDataValue right, NumberDataValue result) throws StandardException(Code)
	This method implements the - operator for "real - real". The operator uses DOUBLE aritmetic as DB2 does. Parameters: left - The value to be subtracted from Parameters: right - The value to be subtracted Parameters: result - The result of a previous call to this method, nullif not called yet A SQLReal containing the result of the subtraction exception: StandardException - Thrown on error

minus
public NumberDataValue minus(NumberDataValue result) throws StandardException(Code)
	This method implements the unary minus operator for real. Parameters: result - The result of a previous call to this method, nullif not called yet A SQLSmalllint containing the result of the division exception: StandardException - Thrown on error

notEquals
public BooleanDataValue notEquals(DataValueDescriptor left, DataValueDescriptor right) throws StandardException(Code)
	The <> operator as called from the language module, as opposed to the storage module. Parameters: left - The value on the left side of the <> Parameters: right - The value on the right side of the <> A SQL boolean value telling whether the two parametersare not equal exception: StandardException - Thrown on error

plus
public NumberDataValue plus(NumberDataValue addend1, NumberDataValue addend2, NumberDataValue result) throws StandardException(Code)
	This method implements the + operator for "real + real". The operator uses DOUBLE aritmetic as DB2 does. Parameters: addend1 - One of the addends Parameters: addend2 - The other addend Parameters: result - The result of a previous call to this method, nullif not called yet A SQLReal containing the result of the addition exception: StandardException - Thrown on error

readExternal
public void readExternal(ObjectInput in) throws IOException(Code)
	See Also: java.io.Externalizable.readExternal See Also:

readExternalFromArray
public void readExternalFromArray(ArrayInputStream in) throws IOException(Code)

restoreToNull
public void restoreToNull()(Code)
	See Also: Storable.restoreToNull

setBigDecimal
public void setBigDecimal(Number bigDecimal) throws StandardException(Code)
	Called for an application setting this value using a BigDecimal

setFrom
protected void setFrom(DataValueDescriptor theValue) throws StandardException(Code)

setInto
final public void setInto(PreparedStatement ps, int position) throws SQLException(Code)
	Set the value into a PreparedStatement. exception: SQLException - Error setting value in PreparedStatement

setInto
final public void setInto(ResultSet rs, int position) throws SQLException, StandardException(Code)
	Set this value into a ResultSet for a subsequent ResultSet.insertRow or ResultSet.updateRow. This method will only be called for non-null values. exception: SQLException - thrown by the ResultSet object exception: StandardException - thrown by me accessing my value.

setObject
void setObject(Object theValue) throws StandardException(Code)
	Set the value from a correctly typed Float object. throws: StandardException -

setValue
public void setValue(String theValue) throws StandardException(Code)
	exception: StandardException - thrown if string not accepted

setValue
public void setValue(Number theValue) throws StandardException(Code)

setValue
public void setValue(float theValue) throws StandardException(Code)

setValue
public void setValue(int theValue)(Code)

setValue
public void setValue(long theValue)(Code)

setValue
public void setValue(double theValue) throws StandardException(Code)
	exception: StandardException - if outsideRangeForReal

setValue
public void setValue(boolean theValue)(Code)
	See Also: NumberDataValue.setValue

setValueFromResultSet
public void setValueFromResultSet(ResultSet resultSet, int colNumber, boolean isNullable) throws StandardException, SQLException(Code)
	See Also: DataValueDescriptor.setValueFromResultSet See Also: exception: StandardException - Thrown on error exception: SQLException - Thrown on error

times
public NumberDataValue times(NumberDataValue left, NumberDataValue right, NumberDataValue result) throws StandardException(Code)
	This method implements the * operator for "real * real". The operator uses DOUBLE aritmetic as DB2 does. Parameters: left - The first value to be multiplied Parameters: right - The second value to be multiplied Parameters: result - The result of a previous call to this method, nullif not called yet A SQLReal containing the result of the multiplication exception: StandardException - Thrown on error

toString
public String toString()(Code)

typeCompare
protected int typeCompare(DataValueDescriptor arg) throws StandardException(Code)
	exception: StandardException - Thrown on error

typePrecedence
public int typePrecedence()(Code)
	See Also: DataValueDescriptor.typePrecedence See Also:

typeToBigDecimal
public int typeToBigDecimal()(Code)
	DOUBLE implementation. Convert to a BigDecimal using getString.

writeExternal
public void writeExternal(ObjectOutput out) throws IOException(Code)

Fields inherited from org.apache.derby.iapi.types.NumberDataType

static Comparable MAXLONG_PLUS_ONE(Code)(Java Doc)
static Comparable MINLONG_MINUS_ONE(Code)(Java Doc)
static DataValueDescriptor ZERO_DECIMAL(Code)(Java Doc)

Methods inherited from org.apache.derby.iapi.types.NumberDataType

final public NumberDataValue absolute(NumberDataValue result) throws StandardException(Code)(Java Doc)
final public int compare(DataValueDescriptor arg) throws StandardException(Code)(Java Doc)
final public boolean compare(int op, DataValueDescriptor other, boolean orderedNulls, boolean unknownRV) throws StandardException(Code)(Java Doc)
public NumberDataValue divide(NumberDataValue dividend, NumberDataValue divisor, NumberDataValue result) throws StandardException(Code)(Java Doc)
public NumberDataValue divide(NumberDataValue dividend, NumberDataValue divisor, NumberDataValue result, int scale) throws StandardException(Code)(Java Doc)
public int getDecimalValuePrecision()(Code)(Java Doc)
public int getDecimalValueScale()(Code)(Java Doc)
abstract protected boolean isNegative()(Code)(Java Doc)
public NumberDataValue minus(NumberDataValue left, NumberDataValue right, NumberDataValue result) throws StandardException(Code)(Java Doc)
public NumberDataValue mod(NumberDataValue dividend, NumberDataValue divisor, NumberDataValue result) throws StandardException(Code)(Java Doc)
public static double normalizeDOUBLE(double v) throws StandardException(Code)(Java Doc)
public static float normalizeREAL(float v) throws StandardException(Code)(Java Doc)
public static float normalizeREAL(double v) throws StandardException(Code)(Java Doc)
final protected boolean objectNull(Object o)(Code)(Java Doc)
public NumberDataValue plus(NumberDataValue addend1, NumberDataValue addend2, NumberDataValue result) throws StandardException(Code)(Java Doc)
public void setBigDecimal(Number bigDecimal) throws StandardException(Code)(Java Doc)
void setObject(Object theValue) throws StandardException(Code)(Java Doc)
public void setValue(short theValue) throws StandardException(Code)(Java Doc)
public void setValue(byte theValue) throws StandardException(Code)(Java Doc)
public void setValue(Number theValue) throws StandardException(Code)(Java Doc)
public NumberDataValue sqrt(NumberDataValue result) throws StandardException(Code)(Java Doc)
abstract protected int typeCompare(DataValueDescriptor arg) throws StandardException(Code)(Java Doc)
public int typeToBigDecimal()(Code)(Java Doc)

Methods inherited from org.apache.derby.iapi.types.DataType

public void checkHostVariable(int declaredLength) throws StandardException(Code)(Java Doc)
public Object cloneObject()(Code)(Java Doc)
public DataValueDescriptor coalesce(DataValueDescriptor[] argumentsList, DataValueDescriptor returnValue) throws StandardException(Code)(Java Doc)
public boolean compare(int op, DataValueDescriptor other, boolean orderedNulls, boolean unknownRV) throws StandardException(Code)(Java Doc)
final protected StandardException dataTypeConversion(String targetType)(Code)(Java Doc)
public BooleanDataValue equals(DataValueDescriptor left, DataValueDescriptor right) throws StandardException(Code)(Java Doc)
public boolean equals(Object other)(Code)(Java Doc)
protected static int flip(int operator)(Code)(Java Doc)
void genericSetObject(Object theValue) throws StandardException(Code)(Java Doc)
public boolean getBoolean() throws StandardException(Code)(Java Doc)
public byte getByte() throws StandardException(Code)(Java Doc)
public byte[] getBytes() throws StandardException(Code)(Java Doc)
public Date getDate(Calendar cal) throws StandardException(Code)(Java Doc)
public double getDouble() throws StandardException(Code)(Java Doc)
public float getFloat() throws StandardException(Code)(Java Doc)
public int getInt() throws StandardException(Code)(Java Doc)
public long getLong() throws StandardException(Code)(Java Doc)
protected String getNationalString(LocaleFinder localeFinder) throws StandardException(Code)(Java Doc)
public Object getObject() throws StandardException(Code)(Java Doc)
public short getShort() throws StandardException(Code)(Java Doc)
public InputStream getStream() throws StandardException(Code)(Java Doc)
public Time getTime(Calendar cal) throws StandardException(Code)(Java Doc)
public Timestamp getTimestamp(Calendar cal) throws StandardException(Code)(Java Doc)
public String getTraceString() throws StandardException(Code)(Java Doc)
String getTypeName(String className)(Code)(Java Doc)
public BooleanDataValue greaterOrEquals(DataValueDescriptor left, DataValueDescriptor right) throws StandardException(Code)(Java Doc)
public BooleanDataValue greaterThan(DataValueDescriptor left, DataValueDescriptor right) throws StandardException(Code)(Java Doc)
public BooleanDataValue in(DataValueDescriptor left, DataValueDescriptor[] inList, boolean orderedList) throws StandardException(Code)(Java Doc)
final protected StandardException invalidFormat()(Code)(Java Doc)
final public BooleanDataValue isNotNull()(Code)(Java Doc)
final public BooleanDataValue isNullOp()(Code)(Java Doc)
public BooleanDataValue lessOrEquals(DataValueDescriptor left, DataValueDescriptor right) throws StandardException(Code)(Java Doc)
public BooleanDataValue lessThan(DataValueDescriptor left, DataValueDescriptor right) throws StandardException(Code)(Java Doc)
public void normalize(DataTypeDescriptor desiredType, DataValueDescriptor source) throws StandardException(Code)(Java Doc)
public BooleanDataValue notEquals(DataValueDescriptor left, DataValueDescriptor right) throws StandardException(Code)(Java Doc)
final protected StandardException outOfRange()(Code)(Java Doc)
public void setBigDecimal(Number bigDecimal) throws StandardException(Code)(Java Doc)
protected void setFrom(DataValueDescriptor dvd) throws StandardException(Code)(Java Doc)
public void setInto(PreparedStatement ps, int position) throws SQLException, StandardException(Code)(Java Doc)
public void setInto(ResultSet rs, int position) throws SQLException, StandardException(Code)(Java Doc)
void setObject(Object theValue) throws StandardException(Code)(Java Doc)
public void setObjectForCast(Object theValue, boolean instanceOfResultType, String resultTypeClassName) throws StandardException(Code)(Java Doc)
public void setToNull()(Code)(Java Doc)
public void setValue(Time theValue) throws StandardException(Code)(Java Doc)
public void setValue(Time theValue, Calendar cal) throws StandardException(Code)(Java Doc)
public void setValue(Timestamp theValue) throws StandardException(Code)(Java Doc)
public void setValue(Timestamp theValue, Calendar cal) throws StandardException(Code)(Java Doc)
public void setValue(Date theValue) throws StandardException(Code)(Java Doc)
public void setValue(Date theValue, Calendar cal) throws StandardException(Code)(Java Doc)
public void setValue(String theValue) throws StandardException(Code)(Java Doc)
public void setValue(int theValue) throws StandardException(Code)(Java Doc)
public void setValue(double theValue) throws StandardException(Code)(Java Doc)
public void setValue(float theValue) throws StandardException(Code)(Java Doc)
public void setValue(short theValue) throws StandardException(Code)(Java Doc)
public void setValue(long theValue) throws StandardException(Code)(Java Doc)
public void setValue(byte theValue) throws StandardException(Code)(Java Doc)
public void setValue(boolean theValue) throws StandardException(Code)(Java Doc)
public void setValue(byte[] theValue) throws StandardException(Code)(Java Doc)
final public void setValue(DataValueDescriptor dvd) throws StandardException(Code)(Java Doc)
public void setValue(InputStream theStream, int valueLength) throws StandardException(Code)(Java Doc)
public void throwLangSetMismatch(Object value) throws StandardException(Code)(Java Doc)
void throwLangSetMismatch(String argTypeName) throws StandardException(Code)(Java Doc)
public int typePrecedence()(Code)(Java Doc)
public int typeToBigDecimal() throws StandardException(Code)(Java Doc)

Methods inherited from java.lang.Object

native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc)
public boolean equals(Object obj)(Code)(Java Doc)
protected void finalize() throws Throwable(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
native public int hashCode()(Code)(Java Doc)
final native public void notify()(Code)(Java Doc)
final native public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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