uk.ac.ed.epcc.webapp.jdbc.expr

Class MysqlTimestampDiffExpr

java.lang.Object

uk.ac.ed.epcc.webapp.jdbc.expr.MysqlTimestampDiffExpr

All Implemented Interfaces:

GroupingSQLValue<java.lang.Long>, SQLExpression<java.lang.Long>, SQLValue<java.lang.Long>, Targetted<java.lang.Long>

public class MysqlTimestampDiffExpr
extends java.lang.Object
implements SQLExpression<java.lang.Long>

A MYSQL specific SQLExpression for the difference between two Date valued expressions.

Constructor Summary

Constructors

Constructor and Description
MysqlTimestampDiffExpr(long resolution, SQLExpression<java.util.Date> start, SQLExpression<java.util.Date> end)

Method Summary

Modifier and Type	Method and Description
int	add(java.lang.StringBuilder sb, boolean qualify) Add the expression to a StringBuilder
boolean	equals(java.lang.Object obj)
java.util.List<PatternArgument>	getParameters(java.util.List<PatternArgument> list) Add parameters for this value to a list.
java.lang.Class<java.lang.Long>	getTarget() Get the type of the returned object as far as it is known.
int	hashCode()
java.lang.Long	makeObject(java.sql.ResultSet rs, int pos) Extract a result of the expression from a ResultSet into an object of the specified type.
java.lang.String	toString()

Methods inherited from class java.lang.Object

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

Methods inherited from interface uk.ac.ed.epcc.webapp.jdbc.expr.SQLExpression

groupingIsomorphic

Methods inherited from interface uk.ac.ed.epcc.webapp.jdbc.expr.GroupingSQLValue

addGroup, checkContentsCanGroup, getGroupParameters

Methods inherited from interface uk.ac.ed.epcc.webapp.jdbc.expr.SQLValue

getRequiredFilter

Constructor Detail

MysqlTimestampDiffExpr

public MysqlTimestampDiffExpr(long resolution,
                              SQLExpression<java.util.Date> start,
                              SQLExpression<java.util.Date> end)

Parameters:

resolution - size of unit in milliseconds.

start -

end -

Method Detail

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

hashCode

public int hashCode()

Specified by:

hashCode in interface SQLExpression<java.lang.Long>

Overrides:

hashCode in class java.lang.Object

equals

public boolean equals(java.lang.Object obj)

Specified by:

equals in interface SQLExpression<java.lang.Long>

Overrides:

equals in class java.lang.Object

add

public int add(java.lang.StringBuilder sb,
               boolean qualify)

Description copied from interface: SQLValue

Add the expression to a StringBuilder

Specified by:

add in interface SQLValue<java.lang.Long>

Parameters:

sb - StringBuilder to modify

qualify - boolean should fields be qualified with the table name

Returns:

number of fields added

getParameters

public java.util.List<PatternArgument> getParameters(java.util.List<PatternArgument> list)

Description copied from interface: SQLValue

Add parameters for this value to a list.

Specified by:

getParameters in interface SQLValue<java.lang.Long>

Parameters:

list - to modify

Returns:

modified list of parameter objects

makeObject

public java.lang.Long makeObject(java.sql.ResultSet rs,
                                 int pos)
                          throws DataException,
                                 java.sql.SQLException

Description copied from interface: SQLValue

Extract a result of the expression from a ResultSet into an object of the specified type. Note that this method is also used to extract the result of functions over the result type.

Specified by:

makeObject in interface SQLValue<java.lang.Long>

Parameters:

rs - ResultSet

Returns:

produced object

Throws:

DataException

java.sql.SQLException

getTarget

public java.lang.Class<java.lang.Long> getTarget()

Description copied from interface: Targetted

Get the type of the returned object as far as it is known. Normally this should be the erasure type corresponding to T.

Specified by:

getTarget in interface Targetted<java.lang.Long>

Returns:

Class object for return type