Package org.h2.expression.function
Class HashFunction
java.lang.Object
org.h2.expression.Expression
org.h2.expression.OperationN
org.h2.expression.function.FunctionN
org.h2.expression.function.HashFunction
- All Implemented Interfaces:
ExpressionWithVariableParameters
,NamedExpression
,HasSQL
,Typed
A HASH or ORA_HASH function.
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Field Summary
FieldsModifier and TypeFieldDescriptionprivate final int
static final int
HASH() (non-standard).private static final String[]
static final int
ORA_HASH() (non-standard).Fields inherited from class org.h2.expression.OperationN
args, argsCount, 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
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Constructor Summary
ConstructorsConstructorDescriptionHashFunction
(Expression arg, int function) HashFunction
(Expression arg1, Expression arg2, Expression arg3, int function) -
Method Summary
Modifier and TypeMethodDescriptionprivate static Value
getName()
Get the name.getValue
(SessionLocal session, Value v1, Value v2, Value v3) Returns the value of this function.private static MessageDigest
private static MessageDigest
hashImpl
(Value value, MessageDigest md) optimize
(SessionLocal session) Try to optimize the expression.private static Value
Methods inherited from class org.h2.expression.function.FunctionN
getUnenclosedSQL, getValue
Methods inherited from class org.h2.expression.OperationN
addParameter, doneWithParameters, getCost, getSubexpression, getSubexpressionCount, getType, isEverything, mapColumns, optimizeArguments, 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, needParentheses, 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
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Field Details
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HASH
public static final int HASHHASH() (non-standard).- See Also:
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ORA_HASH
public static final int ORA_HASHORA_HASH() (non-standard).- See Also:
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NAMES
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function
private final int function
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Constructor Details
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HashFunction
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HashFunction
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Method Details
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getValue
Description copied from class:FunctionN
Returns the value of this function. -
getHash
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oraHash
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hashImpl
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hashImpl
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optimize
Description copied from class:Expression
Try to optimize the expression.- Specified by:
optimize
in classExpression
- Parameters:
session
- the session- Returns:
- the optimized expression
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getName
Description copied from interface:NamedExpression
Get the name.- Returns:
- the name in uppercase
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