Package org.h2.expression

Class BinaryOperation

java.lang.Object

org.h2.expression.Expression

org.h2.expression.Operation2

org.h2.expression.BinaryOperation

All Implemented Interfaces:

HasSQL, Typed

public class BinaryOperation
extends Operation2

A mathematical expression, or string concatenation.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	BinaryOperation.OpType

Field Summary

Fields

Modifier and Type	Field	Description
private boolean	convertRight
private TypeInfo	forcedType
private BinaryOperation.OpType	opType

Fields inherited from class org.h2.expression.Operation2

left, right, type

Fields inherited from class org.h2.expression.Expression

AUTO_PARENTHESES, MAP_IN_AGGREGATE, MAP_IN_WINDOW, MAP_INITIAL, WITH_PARENTHESES, WITHOUT_PARENTHESES

Fields inherited from interface org.h2.util.HasSQL

ADD_PLAN_INFORMATION, DEFAULT_SQL_FLAGS, NO_CASTS, QUOTE_ONLY_WHEN_REQUIRED, REPLACE_LOBS_FOR_TRACE, TRACE_SQL_FLAGS

Constructor Summary

Constructors

Constructor	Description
BinaryOperation(BinaryOperation.OpType opType, Expression left, Expression right)

Method Summary

Modifier and Type	Method	Description
private java.lang.String	getOperationToken()
BinaryOperation.OpType	getOperationType()	Returns the type of this binary operation.
java.lang.StringBuilder	getUnenclosedSQL(java.lang.StringBuilder builder, int sqlFlags)	Get the SQL statement of this expression.
private DbException	getUnexpectedForcedTypeException()
private DbException	getUnsupported(int l, int r)
Value	getValue(SessionLocal session)	Return the resulting value for the current row.
boolean	needParentheses()	Returns whether this expressions needs to be wrapped in parentheses when it is used as an argument of other expressions.
Expression	optimize(SessionLocal session)	Try to optimize the expression.
private Expression	optimizeDateTime(SessionLocal session, int l, int r)
private void	optimizeDecfloat(TypeInfo leftType, TypeInfo rightType)
private Expression	optimizeInterval(int l, int r)
private void	optimizeNumeric(TypeInfo leftType, TypeInfo rightType)
void	setForcedType(TypeInfo forcedType)	Sets a forced data type of a datetime minus datetime operation.
private void	swap()

Methods inherited from class org.h2.expression.Operation2

getCost, getSubexpression, getSubexpressionCount, getType, isEverything, mapColumns, setEvaluatable, updateAggregate

Methods inherited from class org.h2.expression.Expression

addFilterConditions, createIndexConditions, getAlias, getBooleanValue, getColumnName, getColumnNameForView, getEnclosedSQL, getNonAliasExpression, getNotIfPossible, getNullable, getSchemaName, getSQL, getSQL, getSQL, getSQL, getTableAlias, getTableName, getWhenSQL, getWhenValue, isConstant, isIdentity, isNullConstant, isValueSet, isWhenConditionOperand, optimizeCondition, toString, writeExpressions, writeExpressions

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.h2.util.HasSQL

getTraceSQL

Field Detail

opType

private BinaryOperation.OpType opType

forcedType

private TypeInfo forcedType

convertRight

private boolean convertRight

Constructor Detail

BinaryOperation

public BinaryOperation(BinaryOperation.OpType opType,
                       Expression left,
                       Expression right)

Method Detail

setForcedType

public void setForcedType(TypeInfo forcedType)

Sets a forced data type of a datetime minus datetime operation.

Parameters:

forcedType - the forced data type

needParentheses

public boolean needParentheses()

Description copied from class: Expression

Returns whether this expressions needs to be wrapped in parentheses when it is used as an argument of other expressions.

Overrides:

needParentheses in class Expression

Returns:

true if it is

getUnenclosedSQL

public java.lang.StringBuilder getUnenclosedSQL(java.lang.StringBuilder builder,
                                                int sqlFlags)

Description copied from class: Expression

Get the SQL statement of this expression. This may not always be the original SQL statement, especially after optimization. Enclosing '(' and ')' are never appended.

Specified by:

getUnenclosedSQL in class Expression

Parameters:

builder - string builder

sqlFlags - formatting flags

Returns:

the specified string builder

getOperationToken

private java.lang.String getOperationToken()

getValue

public Value getValue(SessionLocal session)

Description copied from class: Expression

Return the resulting value for the current row.

Specified by:

getValue in class Expression

Parameters:

session - the session

Returns:

the result

optimize

public Expression optimize(SessionLocal session)

Description copied from class: Expression

Try to optimize the expression.

Specified by:

optimize in class Expression

Parameters:

session - the session

Returns:

the optimized expression

optimizeNumeric

private void optimizeNumeric(TypeInfo leftType,
                             TypeInfo rightType)

optimizeDecfloat

private void optimizeDecfloat(TypeInfo leftType,
                              TypeInfo rightType)

optimizeInterval

private Expression optimizeInterval(int l,
                                    int r)

optimizeDateTime

private Expression optimizeDateTime(SessionLocal session,
                                    int l,
                                    int r)

getUnsupported

private DbException getUnsupported(int l,
                                   int r)

getUnexpectedForcedTypeException

private DbException getUnexpectedForcedTypeException()

swap

private void swap()

getOperationType

public BinaryOperation.OpType getOperationType()

Returns the type of this binary operation.

Returns:

the type of this binary operation