org.h2.expression.function

类 FileFunction

java.lang.Object

org.h2.expression.Expression

org.h2.expression.Operation1_2

org.h2.expression.function.Function1_2

org.h2.expression.function.FileFunction

所有已实现的接口:

NamedExpression, HasSQL, Typed

public final class FileFunction
extends Function1_2

A FILE_READ or FILE_WRITE function.

字段概要

字段

限定符和类型	字段和说明
static int	FILE_READ FILE_READ() (non-standard).
static int	FILE_WRITE FILE_WRITE() (non-standard).

从类继承的字段 org.h2.expression.Operation1_2

left, right, 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
FileFunction(Expression arg1, Expression arg2, int function)

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.
boolean	isEverything(ExpressionVisitor visitor) Check if this expression and all sub-expressions can fulfill a criteria.
Expression	optimize(SessionLocal session) Try to optimize the expression.

从类继承的方法 org.h2.expression.function.Function1_2

getUnenclosedSQL, getValue

从类继承的方法 org.h2.expression.Operation1_2

getCost, getSubexpression, getSubexpressionCount, getType, mapColumns, 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

FILE_READ

public static final int FILE_READ

FILE_READ() (non-standard).

另请参阅:

常量字段值

FILE_WRITE

public static final int FILE_WRITE

FILE_WRITE() (non-standard).

另请参阅:

常量字段值

构造器详细资料

FileFunction

public FileFunction(Expression arg1,
                    Expression arg2,
                    int function)

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 Function1_2

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

isEverything

public boolean isEverything(ExpressionVisitor visitor)

从类复制的说明: Expression

Check if this expression and all sub-expressions can fulfill a criteria. If any part returns false, the result is false.

覆盖:

isEverything 在类中 Operation1_2

参数:

visitor - the visitor

返回:

if the criteria can be fulfilled

getName

public String getName()

从接口复制的说明: NamedExpression

Get the name.

返回:

the name in uppercase