org.h2.expression.function

类 CoalesceFunction

java.lang.Object

org.h2.expression.Expression

org.h2.expression.OperationN

org.h2.expression.function.FunctionN

org.h2.expression.function.CoalesceFunction

所有已实现的接口:

ExpressionWithVariableParameters, NamedExpression, HasSQL, Typed

public final class CoalesceFunction
extends FunctionN

A COALESCE, GREATEST, or LEAST function.

字段概要

字段

限定符和类型	字段和说明
static int	COALESCE COALESCE().
static int	GREATEST GREATEST() (non-standard).
static int	LEAST LEAST() (non-standard).

从类继承的字段 org.h2.expression.OperationN

args, argsCount, type

从类继承的字段 org.h2.expression.Expression

AUTO_PARENTHESES, MAP_IN_AGGREGATE, MAP_IN_WINDOW, MAP_INITIAL, WITH_PARENTHESES, WITHOUT_PARENTHESES

从接口继承的字段 org.h2.util.HasSQL

ADD_PLAN_INFORMATION, DEFAULT_SQL_FLAGS, NO_CASTS, QUOTE_ONLY_WHEN_REQUIRED, REPLACE_LOBS_FOR_TRACE, TRACE_SQL_FLAGS

构造器概要

构造器

构造器和说明
CoalesceFunction(int function)
CoalesceFunction(int function, Expression... args)

方法概要

限定符和类型	方法和说明
String	getName() Get the name.
Value	getValue(SessionLocal session) Return the resulting value for the current row.
Expression	optimize(SessionLocal session) Try to optimize the expression.

从类继承的方法 org.h2.expression.function.FunctionN

getUnenclosedSQL, getValue

从类继承的方法 org.h2.expression.OperationN

addParameter, doneWithParameters, getCost, getSubexpression, getSubexpressionCount, getType, isEverything, mapColumns, optimizeArguments, setEvaluatable, updateAggregate

从类继承的方法 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

从类继承的方法 java.lang.Object

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

从接口继承的方法 org.h2.util.HasSQL

getTraceSQL

字段详细资料

COALESCE

public static final int COALESCE

COALESCE().

另请参阅:

常量字段值

GREATEST

public static final int GREATEST

GREATEST() (non-standard).

另请参阅:

常量字段值

LEAST

public static final int LEAST

LEAST() (non-standard).

另请参阅:

常量字段值

构造器详细资料

CoalesceFunction

public CoalesceFunction(int function)

CoalesceFunction

public CoalesceFunction(int function,
                        Expression... args)

方法详细资料

getValue

public Value getValue(SessionLocal session)

从类复制的说明: Expression

Return the resulting value for the current row.

覆盖:

getValue 在类中 FunctionN

参数:

session - the session

返回:

the result

optimize

public Expression optimize(SessionLocal session)

从类复制的说明: Expression

Try to optimize the expression.

指定者:

optimize 在类中 Expression

参数:

session - the session

返回:

the optimized expression

getName

public String getName()

从接口复制的说明: NamedExpression

Get the name.

返回:

the name in uppercase