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org.apache.derby.iapi.types
Class SQLDate  

java.lang.Object
  org.apache.derby.iapi.types.DataType
      org.apache.derby.iapi.types.SQLDate

All Implemented Interfaces:

CloneableObject, DataValueDescriptor, DateTimeDataValue, java.io.Externalizable, org.apache.derby.iapi.services.io.Formatable, Orderable, java.io.Serializable, org.apache.derby.iapi.services.io.Storable, org.apache.derby.iapi.services.io.TypedFormat

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public final class SQLDate

extends DataType

implements DateTimeDataValue

This contains an instance of a SQL Date.

The date is stored as int (year << 16 + month << 8 + day) Null is represented by an encodedDate value of 0. Some of the static methods in this class are also used by SQLTime and SQLTimestamp so check those classes if you change the date encoding PERFORMANCE OPTIMIZATION: The java.sql.Date object is only instantiated when needed do to the overhead of Date.valueOf(), etc. methods.

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Field Summary
private static int	BASE_MEMORY_USAGE
private  int	encodedDate
private static char[]	END_OF_STRING
private static char	IBM_EUR_SEPARATOR
private static char[]	IBM_EUR_SEPARATOR_ONLY
private static char	IBM_USA_SEPARATOR
private static char[]	IBM_USA_SEPARATOR_ONLY
(package private) static char	ISO_SEPARATOR
private static char[]	ISO_SEPARATOR_ONLY
private  java.lang.String	valueString

 

Fields inherited from interface org.apache.derby.iapi.types.DateTimeDataValue

DAY_FIELD, DAY_INTERVAL, FRAC_SECOND_INTERVAL, HOUR_FIELD, HOUR_INTERVAL, MINUTE_FIELD, MINUTE_INTERVAL, MONTH_FIELD, MONTH_INTERVAL, QUARTER_INTERVAL, SECOND_FIELD, SECOND_INTERVAL, WEEK_INTERVAL, YEAR_FIELD, YEAR_INTERVAL

 

Fields inherited from interface org.apache.derby.iapi.types.Orderable

ORDER_OP_EQUALS, ORDER_OP_GREATEROREQUALS, ORDER_OP_GREATERTHAN, ORDER_OP_LESSOREQUALS, ORDER_OP_LESSTHAN

 

Constructor Summary
	SQLDate()           no-arg constructor required by Formattable
	SQLDate(java.sql.Date value)
private	SQLDate(int encodedDate)
	SQLDate(java.lang.String dateStr, boolean isJdbcEscape, org.apache.derby.iapi.services.i18n.LocaleFinder localeFinder)           Construct a date from a string.
	SQLDate(java.lang.String dateStr, boolean isJdbcEscape, org.apache.derby.iapi.services.i18n.LocaleFinder localeFinder, java.util.Calendar cal)           Construct a date from a string.

 

Method Summary
int	compare(DataValueDescriptor other)           Orderable interface
boolean	compare(int op, DataValueDescriptor other, boolean orderedNulls, boolean unknownRV)           Compare this Orderable with a given Orderable for the purpose of qualification and sorting.
static DateTimeDataValue	computeDateFunction(DataValueDescriptor operand, DataValueFactory dvf)           Implement the date SQL function: construct a SQL date from a string, number, or timestamp.
(package private) static int	computeEncodedDate(java.util.Calendar cal)           computeEncodedDate extracts the year, month and date from a Calendar value and encodes them as year << 16 + month << 8 + date Use this function will help to remember to add 1 to month which is 0 based in the Calendar class
private static int	computeEncodedDate(java.util.Date value)           Compute the encoded date given a date
(package private) static int	computeEncodedDate(java.util.Date value, java.util.Calendar currentCal)
(package private) static int	computeEncodedDate(int y, int m, int d)
(package private) static void	dateToString(int year, int month, int day, java.lang.StringBuffer sb)           Convert a date to the JDBC representation and append it to a string buffer.
(package private) static java.lang.String	encodedDateToString(int encodedDate)           Get the String version from the encodedDate.
int	estimateMemoryUsage()           Estimate the memory usage in bytes of the data value and the overhead of the class.
DataValueDescriptor	getClone()           Clone this DataValueDescriptor.
java.sql.Date	getDate(java.util.Calendar cal)           Get the value field.
NumberDataValue	getDate(NumberDataValue result)           Get the day of the month.
(package private) static int	getDay(int encodedDate)           Get the day from the encodedDate.
(package private)  int	getEncodedDate()
NumberDataValue	getHours(NumberDataValue result)           Get the hour of the day out of a time or timestamp.
int	getLength()           Gets the length of the data value.
NumberDataValue	getMinutes(NumberDataValue result)           Get the minute of the hour out of a time or timestamp.
(package private) static int	getMonth(int encodedDate)           Get the month from the encodedDate.
NumberDataValue	getMonth(NumberDataValue result)           Get the month number out of a date.
protected  java.lang.String	getNationalString(org.apache.derby.iapi.services.i18n.LocaleFinder localeFinder)           International version of getString().
DataValueDescriptor	getNewNull()           Get a new null value of the same type as this data value.
java.lang.Object	getObject()           getObject returns the date value
NumberDataValue	getSeconds(NumberDataValue result)           Get the second of the minute out of a time or timestamp.
java.lang.String	getString()           Gets the value in the data value descriptor as a String.
private  long	getTimeInMillis(java.util.Calendar cal)
java.sql.Timestamp	getTimestamp(java.util.Calendar cal)           getTimestamp returns a timestamp with the date value time is set to 00:00:00.0
int	getTypeFormatId()           Return my format identifier.
java.lang.String	getTypeName()           Get the SQL name of the datatype
(package private) static int	getYear(int encodedDate)           Get the year from the encodedDate.
NumberDataValue	getYear(NumberDataValue result)           Get the year number out of a date.
int	hashCode()           Get a value that represents this Object, as uniquely as possible within the confines of an int.
boolean	isNull()           Check if the value is null.
private  java.sql.Timestamp	newTimestamp(java.util.Calendar cal)
private  void	parseDate(java.util.Date value)
private  void	parseDate(java.lang.String dateStr, boolean isJdbcEscape, org.apache.derby.iapi.services.i18n.LocaleFinder localeFinder, java.util.Calendar cal)
void	readExternal(java.io.ObjectInput in)           This method restores an object's state by reading in the instance data for the object from the passed in stream.
void	readExternalFromArray(org.apache.derby.iapi.services.io.ArrayInputStream in)           Read the DataValueDescriptor from the stream.
void	restoreToNull()           Restore this object to its (SQL)null value.
protected  void	setFrom(DataValueDescriptor theValue)
void	setInto(java.sql.PreparedStatement ps, int position)           Adding this method to ensure that super class' setInto method doesn't get called that leads to the violation of JDBC spec( untyped nulls ) when batching is turned on.
(package private) static NumberDataValue	setSource(int value, NumberDataValue source)           This helper routine tests the nullability of various parameters and sets up the result appropriately.
void	setValue(java.sql.Date value, java.util.Calendar cal)           Set the value of this DataValueDescriptor.
void	setValue(java.lang.Object theValue)           Set the value of this DataValueDescriptor to the given value
void	setValue(java.lang.String theValue)           Set the value of this DataValueDescriptor.
void	setValue(java.sql.Timestamp value, java.util.Calendar cal)           Set the value of this DataValueDescriptor.
void	setValueFromResultSet(java.sql.ResultSet resultSet, int colNumber, boolean isNullable)           Set the value based on the value for the specified DataValueDescriptor from the specified ResultSet.
DateTimeDataValue	timestampAdd(int intervalType, NumberDataValue intervalCount, java.sql.Date currentDate, DateTimeDataValue resultHolder)           Add a number of intervals to a datetime value.
NumberDataValue	timestampDiff(int intervalType, DateTimeDataValue time1, java.sql.Date currentDate, NumberDataValue resultHolder)           Finds the difference between two datetime values as a number of intervals.
java.lang.String	toString()           Convert this Object to a human-readable String.
private  SQLTimestamp	toTimestamp()
int	typePrecedence()           Each built-in type in JSQL has a precedence.
void	writeExternal(java.io.ObjectOutput out)           This method is responsible for writing the instance data of an object to the passed in stream.

 

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

checkHostVariable, cloneObject, coalesce, dataTypeConversion, equals, equals, flip, genericSetObject, getBoolean, getByte, getBytes, getDouble, getFloat, getInt, getLong, getShort, getStream, getTime, greaterOrEquals, greaterThan, in, invalidFormat, isNotNull, isNullOp, lessOrEquals, lessThan, normalize, notEquals, outOfRange, setBigDecimal, setInto, setObjectForCast, setToNull, setValue, setValue, setValue, setValue, setValue, setValue, setValue, setValue, setValue, setValue, setValue, setValue, setValue, setValue, throwLangSetMismatch, throwLangSetMismatch, typeToBigDecimal

 

Methods inherited from class java.lang.Object

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

 

Methods inherited from interface org.apache.derby.iapi.types.DataValueDescriptor

checkHostVariable, coalesce, equals, getBoolean, getByte, getBytes, getDouble, getFloat, getInt, getLong, getShort, getStream, getTime, greaterOrEquals, greaterThan, in, isNotNull, isNullOp, lessOrEquals, lessThan, normalize, notEquals, setBigDecimal, setInto, setObjectForCast, setToNull, setValue, setValue, setValue, setValue, setValue, setValue, setValue, setValue, setValue, setValue, setValue, setValue, setValue, setValue, typeToBigDecimal

 

Field Detail

encodedDate

private int encodedDate

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valueString

private java.lang.String valueString

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BASE_MEMORY_USAGE

private static final int BASE_MEMORY_USAGE

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ISO_SEPARATOR

static final char ISO_SEPARATOR

See Also:

Constant Field Values

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ISO_SEPARATOR_ONLY

private static final char[] ISO_SEPARATOR_ONLY

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IBM_USA_SEPARATOR

private static final char IBM_USA_SEPARATOR

See Also:

Constant Field Values

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IBM_USA_SEPARATOR_ONLY

private static final char[] IBM_USA_SEPARATOR_ONLY

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IBM_EUR_SEPARATOR

private static final char IBM_EUR_SEPARATOR

See Also:

Constant Field Values

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IBM_EUR_SEPARATOR_ONLY

private static final char[] IBM_EUR_SEPARATOR_ONLY

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END_OF_STRING

private static final char[] END_OF_STRING

Constructor Detail

SQLDate

public SQLDate()

no-arg constructor required by Formattable

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SQLDate

public SQLDate(java.sql.Date value)
        throws org.apache.derby.iapi.error.StandardException

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SQLDate

private SQLDate(int encodedDate)

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SQLDate

public SQLDate(java.lang.String dateStr,
               boolean isJdbcEscape,
               org.apache.derby.iapi.services.i18n.LocaleFinder localeFinder)
        throws org.apache.derby.iapi.error.StandardException

Construct a date from a string. The allowed date formats are:

1. ISO: yyyy-mm-dd
2. IBM USA standard: mm/dd/yyyy
3. IBM European standard: dd.mm.yyyy

Trailing blanks may be included; leading zeros may be omitted from the month and day portions.

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SQLDate

public SQLDate(java.lang.String dateStr,
               boolean isJdbcEscape,
               org.apache.derby.iapi.services.i18n.LocaleFinder localeFinder,
               java.util.Calendar cal)
        throws org.apache.derby.iapi.error.StandardException

Construct a date from a string. The allowed date formats are:

1. ISO: yyyy-mm-dd
2. IBM USA standard: mm/dd/yyyy
3. IBM European standard: dd.mm.yyyy

Trailing blanks may be included; leading zeros may be omitted from the month and day portions.

Method Detail

estimateMemoryUsage

public int estimateMemoryUsage()

Description copied from interface: DataValueDescriptor

Estimate the memory usage in bytes of the data value and the overhead of the class.

Specified by:

estimateMemoryUsage in interface DataValueDescriptor

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getEncodedDate

int getEncodedDate()

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getString

public java.lang.String getString()

Description copied from interface: DataValueDescriptor

Gets the value in the data value descriptor as a String. Throws an exception if the data value is not a string.

Specified by:

getString in interface DataValueDescriptor

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getTimestamp

public java.sql.Timestamp getTimestamp(java.util.Calendar cal)

getTimestamp returns a timestamp with the date value time is set to 00:00:00.0

Specified by:

getTimestamp in interface DataValueDescriptor

Overrides:

getTimestamp in class DataType

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getTimeInMillis

private long getTimeInMillis(java.util.Calendar cal)

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newTimestamp

private java.sql.Timestamp newTimestamp(java.util.Calendar cal)

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getObject

public java.lang.Object getObject()

getObject returns the date value

Specified by:

getObject in interface DataValueDescriptor

Overrides:

getObject in class DataType

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getLength

public int getLength()

Description copied from interface: DataValueDescriptor

Gets the length of the data value. The meaning of this is implementation-dependent. For string types, it is the number of characters in the string. For numeric types, it is the number of bytes used to store the number. This is the actual length of this value, not the length of the type it was defined as. For example, a VARCHAR value may be shorter than the declared VARCHAR (maximum) length.

Specified by:

getLength in interface DataValueDescriptor

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getTypeName

public java.lang.String getTypeName()

Description copied from interface: DataValueDescriptor

Get the SQL name of the datatype

Specified by:

getTypeName in interface DataValueDescriptor

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getTypeFormatId

public int getTypeFormatId()

Return my format identifier.

Specified by:

getTypeFormatId in interface org.apache.derby.iapi.services.io.TypedFormat

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writeExternal

public void writeExternal(java.io.ObjectOutput out)
                   throws java.io.IOException

Description copied from interface: java.io.Externalizable

This method is responsible for writing the instance data of an object to the passed in stream. Note that this stream is not a subclass of OutputStream, but rather is a class that implements the ObjectOutput interface. That interface provides a number of methods for writing Java data values to a stream.

Not that the implementation of this method must be coordinated with the implementation of readExternal.

Specified by:

writeExternal in interface java.io.Externalizable

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readExternal

public void readExternal(java.io.ObjectInput in)
                  throws java.io.IOException

Description copied from interface: java.io.Externalizable

This method restores an object's state by reading in the instance data for the object from the passed in stream. Note that this stream is not a subclass of InputStream, but rather is a class that implements the ObjectInput interface. That interface provides a mechanism for reading in Java data types from a stream.

Note that this method must be compatible with writeExternal. It must read back the exact same types that were written by that method in the exact order they were written.

If this method needs to read back an object instance, then the class for that object must be found and loaded. If that operation fails, then this method throws a ClassNotFoundException

Specified by:

readExternal in interface java.io.Externalizable

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readExternalFromArray

public void readExternalFromArray(org.apache.derby.iapi.services.io.ArrayInputStream in)
                           throws java.io.IOException

Description copied from interface: DataValueDescriptor

Read the DataValueDescriptor from the stream.

Initialize the data value by reading it's values from the ArrayInputStream. This interface is provided as a way to achieve possible performance enhancement when reading an array can be optimized over reading from a generic stream from readExternal().

Specified by:

readExternalFromArray in interface DataValueDescriptor

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getClone

public DataValueDescriptor getClone()

Description copied from interface: DataValueDescriptor

Clone this DataValueDescriptor. Results in a new object that has the same value as this but can be modified independently.

Specified by:

getClone in interface DataValueDescriptor

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getNewNull

public DataValueDescriptor getNewNull()

Description copied from interface: DataValueDescriptor

Get a new null value of the same type as this data value.

Specified by:

getNewNull in interface DataValueDescriptor

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restoreToNull

public void restoreToNull()

Description copied from interface: org.apache.derby.iapi.services.io.Storable

Restore this object to its (SQL)null value.

Specified by:

restoreToNull in interface org.apache.derby.iapi.services.io.Storable

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setValueFromResultSet

public void setValueFromResultSet(java.sql.ResultSet resultSet,
                                  int colNumber,
                                  boolean isNullable)
                           throws java.sql.SQLException,
                                  org.apache.derby.iapi.error.StandardException

Description copied from interface: DataValueDescriptor

Set the value based on the value for the specified DataValueDescriptor from the specified ResultSet.

Specified by:

setValueFromResultSet in interface DataValueDescriptor

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compare

public int compare(DataValueDescriptor other)
            throws org.apache.derby.iapi.error.StandardException

Orderable interface

Specified by:

compare in interface DataValueDescriptor

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compare

public boolean compare(int op,
                       DataValueDescriptor other,
                       boolean orderedNulls,
                       boolean unknownRV)
                throws org.apache.derby.iapi.error.StandardException

Description copied from interface: DataValueDescriptor

Compare this Orderable with a given Orderable for the purpose of qualification and sorting. The caller gets to determine how nulls should be treated - they can either be ordered values or unknown values.

Specified by:

compare in interface DataValueDescriptor

Overrides:

compare in class DataType

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parseDate

private void parseDate(java.util.Date value)
                throws org.apache.derby.iapi.error.StandardException

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parseDate

private void parseDate(java.lang.String dateStr,
                       boolean isJdbcEscape,
                       org.apache.derby.iapi.services.i18n.LocaleFinder localeFinder,
                       java.util.Calendar cal)
                throws org.apache.derby.iapi.error.StandardException

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setValue

public void setValue(java.lang.Object theValue)
              throws org.apache.derby.iapi.error.StandardException

Description copied from interface: DataValueDescriptor

Set the value of this DataValueDescriptor to the given value

Specified by:

setValue in interface DataValueDescriptor

Overrides:

setValue in class DataType

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setFrom

protected void setFrom(DataValueDescriptor theValue)
                throws org.apache.derby.iapi.error.StandardException

Overrides:

setFrom in class DataType

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setValue

public void setValue(java.sql.Date value,
                     java.util.Calendar cal)
              throws org.apache.derby.iapi.error.StandardException

Description copied from interface: DataValueDescriptor

Set the value of this DataValueDescriptor.

Specified by:

setValue in interface DataValueDescriptor

Overrides:

setValue in class DataType

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setValue

public void setValue(java.sql.Timestamp value,
                     java.util.Calendar cal)
              throws org.apache.derby.iapi.error.StandardException

Description copied from interface: DataValueDescriptor

Set the value of this DataValueDescriptor.

Specified by:

setValue in interface DataValueDescriptor

Overrides:

setValue in class DataType

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setValue

public void setValue(java.lang.String theValue)
              throws org.apache.derby.iapi.error.StandardException

Description copied from interface: DataValueDescriptor

Set the value of this DataValueDescriptor.

Specified by:

setValue in interface DataValueDescriptor

Overrides:

setValue in class DataType

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getYear

public NumberDataValue getYear(NumberDataValue result)
                        throws org.apache.derby.iapi.error.StandardException

Description copied from interface: DateTimeDataValue

Get the year number out of a date.

Specified by:

getYear in interface DateTimeDataValue

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getMonth

public NumberDataValue getMonth(NumberDataValue result)
                         throws org.apache.derby.iapi.error.StandardException

Description copied from interface: DateTimeDataValue

Get the month number out of a date.

Specified by:

getMonth in interface DateTimeDataValue

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getDate

public NumberDataValue getDate(NumberDataValue result)
                        throws org.apache.derby.iapi.error.StandardException

Description copied from interface: DateTimeDataValue

Get the day of the month.

Specified by:

getDate in interface DateTimeDataValue

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getHours

public NumberDataValue getHours(NumberDataValue result)
                         throws org.apache.derby.iapi.error.StandardException

Description copied from interface: DateTimeDataValue

Get the hour of the day out of a time or timestamp.

Specified by:

getHours in interface DateTimeDataValue

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getMinutes

public NumberDataValue getMinutes(NumberDataValue result)
                           throws org.apache.derby.iapi.error.StandardException

Description copied from interface: DateTimeDataValue

Get the minute of the hour out of a time or timestamp.

Specified by:

getMinutes in interface DateTimeDataValue

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getSeconds

public NumberDataValue getSeconds(NumberDataValue result)
                           throws org.apache.derby.iapi.error.StandardException

Description copied from interface: DateTimeDataValue

Get the second of the minute out of a time or timestamp.

Specified by:

getSeconds in interface DateTimeDataValue

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toString

public java.lang.String toString()

Description copied from class: java.lang.Object

Convert this Object to a human-readable String. There are no limits placed on how long this String should be or what it should contain. We suggest you make it as intuitive as possible to be able to place it into System.out.println() 55 and such.

It is typical, but not required, to ensure that this method never completes abruptly with a java.lang.RuntimeException.

This method will be called when performing string concatenation with this object. If the result is null, string concatenation will instead use "null".

The default implementation returns getClass().getName() + "@" + Integer.toHexString(hashCode()).

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hashCode

public int hashCode()

Description copied from class: java.lang.Object

Get a value that represents this Object, as uniquely as possible within the confines of an int.

There are some requirements on this method which subclasses must follow:

• Semantic equality implies identical hashcodes. In other words, if a.equals(b) is true, then a.hashCode() == b.hashCode() must be as well. However, the reverse is not necessarily true, and two objects may have the same hashcode without being equal.
• It must be consistent. Whichever value o.hashCode() returns on the first invocation must be the value returned on all later invocations as long as the object exists. Notice, however, that the result of hashCode may change between separate executions of a Virtual Machine, because it is not invoked on the same object.

Notice that since hashCode is used in java.util.Hashtable and other hashing classes, a poor implementation will degrade the performance of hashing (so don't blindly implement it as returning a constant!). Also, if calculating the hash is time-consuming, a class may consider caching the results.

The default implementation returns System.identityHashCode(this)

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typePrecedence

public int typePrecedence()

Description copied from interface: DataValueDescriptor

Each built-in type in JSQL has a precedence. This precedence determines how to do type promotion when using binary operators. For example, float has a higher precedence than int, so when adding an int to a float, the result type is float. The precedence for some types is arbitrary. For example, it doesn't matter what the precedence of the boolean type is, since it can't be mixed with other types. But the precedence for the number types is critical. The SQL standard requires that exact numeric types be promoted to approximate numeric when one operator uses both. Also, the precedence is arranged so that one will not lose precision when promoting a type.

Specified by:

typePrecedence in interface DataValueDescriptor

Overrides:

typePrecedence in class DataType

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isNull

public final boolean isNull()

Check if the value is null. encodedDate is 0 if the value is null

Specified by:

isNull in interface org.apache.derby.iapi.services.io.Storable

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getDate

public java.sql.Date getDate(java.util.Calendar cal)

Get the value field. We instantiate the field on demand.

Specified by:

getDate in interface DataValueDescriptor

Overrides:

getDate in class DataType

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getYear

static int getYear(int encodedDate)

Get the year from the encodedDate.

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getMonth

static int getMonth(int encodedDate)

Get the month from the encodedDate.

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getDay

static int getDay(int encodedDate)

Get the day from the encodedDate.

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computeEncodedDate

static int computeEncodedDate(java.util.Calendar cal)
                       throws org.apache.derby.iapi.error.StandardException

computeEncodedDate extracts the year, month and date from a Calendar value and encodes them as year << 16 + month << 8 + date Use this function will help to remember to add 1 to month which is 0 based in the Calendar class

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computeEncodedDate

static int computeEncodedDate(int y,
                              int m,
                              int d)
                       throws org.apache.derby.iapi.error.StandardException

---

dateToString

static void dateToString(int year,
                         int month,
                         int day,
                         java.lang.StringBuffer sb)

Convert a date to the JDBC representation and append it to a string buffer.

---

encodedDateToString

static java.lang.String encodedDateToString(int encodedDate)

Get the String version from the encodedDate.

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getNationalString

protected java.lang.String getNationalString(org.apache.derby.iapi.services.i18n.LocaleFinder localeFinder)
                                      throws org.apache.derby.iapi.error.StandardException

International version of getString(). Overrides getNationalString in DataType for date, time, and timestamp.

Overrides:

getNationalString in class DataType

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setSource

static NumberDataValue setSource(int value,
                                 NumberDataValue source)
                          throws org.apache.derby.iapi.error.StandardException

This helper routine tests the nullability of various parameters and sets up the result appropriately. If source is null, a new NumberDataValue is built.

---

computeEncodedDate

private static int computeEncodedDate(java.util.Date value)
                               throws org.apache.derby.iapi.error.StandardException

Compute the encoded date given a date

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computeEncodedDate

static int computeEncodedDate(java.util.Date value,
                              java.util.Calendar currentCal)
                       throws org.apache.derby.iapi.error.StandardException

---

computeDateFunction

public static DateTimeDataValue computeDateFunction(DataValueDescriptor operand,
                                                    DataValueFactory dvf)
                                             throws org.apache.derby.iapi.error.StandardException

Implement the date SQL function: construct a SQL date from a string, number, or timestamp.

---

setInto

public void setInto(java.sql.PreparedStatement ps,
                    int position)
             throws java.sql.SQLException,
                    org.apache.derby.iapi.error.StandardException

Adding this method to ensure that super class' setInto method doesn't get called that leads to the violation of JDBC spec( untyped nulls ) when batching is turned on.

Specified by:

setInto in interface DataValueDescriptor

Overrides:

setInto in class DataType

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timestampAdd

public DateTimeDataValue timestampAdd(int intervalType,
                                      NumberDataValue intervalCount,
                                      java.sql.Date currentDate,
                                      DateTimeDataValue resultHolder)
                               throws org.apache.derby.iapi.error.StandardException

Add a number of intervals to a datetime value. Implements the JDBC escape TIMESTAMPADD function.

Specified by:

timestampAdd in interface DateTimeDataValue

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toTimestamp

private SQLTimestamp toTimestamp()
                          throws org.apache.derby.iapi.error.StandardException

---

timestampDiff

public NumberDataValue timestampDiff(int intervalType,
                                     DateTimeDataValue time1,
                                     java.sql.Date currentDate,
                                     NumberDataValue resultHolder)
                              throws org.apache.derby.iapi.error.StandardException

Finds the difference between two datetime values as a number of intervals. Implements the JDBC TIMESTAMPDIFF escape function.

Specified by:

timestampDiff in interface DateTimeDataValue

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