org.h2.expression

类 Parameter

java.lang.Object

org.h2.expression.Expression

org.h2.expression.Operation0

org.h2.expression.Parameter

所有已实现的接口:

ParameterInterface, HasSQL, Typed

public final class Parameter
extends Operation0
implements ParameterInterface

A parameter of a prepared statement.

字段概要

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
Parameter(int index)

方法概要

限定符和类型	方法和说明
void	checkSet() Check if the value is set.
int	getCost() Estimate the cost to process the expression.
int	getIndex()
Expression	getNotIfPossible(SessionLocal session) If it is possible, return the negated expression.
Value	getParamValue() Get the value of the parameter if set.
TypeInfo	getType() Returns the data type.
StringBuilder	getUnenclosedSQL(StringBuilder builder, int sqlFlags) Get the SQL statement of this expression.
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.
boolean	isValueSet() Is the value of a parameter set.
Expression	optimize(SessionLocal session) Try to optimize the expression.
void	setColumn(Column column)
void	setValue(Value v)
void	setValue(Value v, boolean closeOld) Set the value of the parameter.

从类继承的方法 org.h2.expression.Operation0

mapColumns, setEvaluatable, updateAggregate

从类继承的方法 org.h2.expression.Expression

addFilterConditions, createIndexConditions, getAlias, getBooleanValue, getColumnName, getColumnNameForView, getEnclosedSQL, getNonAliasExpression, getNullable, getSchemaName, getSQL, getSQL, getSQL, getSQL, getSubexpression, getSubexpressionCount, getTableAlias, getTableName, getWhenSQL, getWhenValue, isConstant, isIdentity, isNullConstant, 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.expression.ParameterInterface

getNullable

从接口继承的方法 org.h2.util.HasSQL

getTraceSQL

构造器详细资料

Parameter

public Parameter(int index)

方法详细资料

getUnenclosedSQL

public StringBuilder getUnenclosedSQL(StringBuilder builder,
                                      int sqlFlags)

从类复制的说明: 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.

指定者:

getUnenclosedSQL 在类中 Expression

参数:

builder - string builder

sqlFlags - formatting flags

返回:

the specified string builder

setValue

public void setValue(Value v,
                     boolean closeOld)

从接口复制的说明: ParameterInterface

Set the value of the parameter.

指定者:

setValue 在接口中 ParameterInterface

参数:

v - the new value

closeOld - if the old value (if one is set) should be closed

setValue

public void setValue(Value v)

getParamValue

public Value getParamValue()

从接口复制的说明: ParameterInterface

Get the value of the parameter if set.

指定者:

getParamValue 在接口中 ParameterInterface

返回:

the value or null

getValue

public Value getValue(SessionLocal session)

从类复制的说明: Expression

Return the resulting value for the current row.

指定者:

getValue 在类中 Expression

参数:

session - the session

返回:

the result

getType

public TypeInfo getType()

从类复制的说明: Expression

Returns the data type. The data type may be unknown before the optimization phase.

指定者:

getType 在接口中 ParameterInterface

指定者:

getType 在接口中 Typed

指定者:

getType 在类中 Expression

返回:

the data type

checkSet

public void checkSet()

从接口复制的说明: ParameterInterface

Check if the value is set.

指定者:

checkSet 在接口中 ParameterInterface

optimize

public Expression optimize(SessionLocal session)

从类复制的说明: Expression

Try to optimize the expression.

覆盖:

optimize 在类中 Operation0

参数:

session - the session

返回:

the optimized expression

isValueSet

public boolean isValueSet()

从类复制的说明: Expression

Is the value of a parameter set.

指定者:

isValueSet 在接口中 ParameterInterface

覆盖:

isValueSet 在类中 Expression

返回:

true if set

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.

指定者:

isEverything 在类中 Expression

参数:

visitor - the visitor

返回:

if the criteria can be fulfilled

getCost

public int getCost()

从类复制的说明: Expression

Estimate the cost to process the expression. Used when optimizing the query, to calculate the query plan with the lowest estimated cost.

指定者:

getCost 在类中 Expression

返回:

the estimated cost

getNotIfPossible

public Expression getNotIfPossible(SessionLocal session)

从类复制的说明: Expression

If it is possible, return the negated expression. This is used to optimize NOT expressions: NOT ID>10 can be converted to ID<=10. Returns null if negating is not possible.

覆盖:

getNotIfPossible 在类中 Expression

参数:

session - the session

返回:

the negated expression, or null

setColumn

public void setColumn(Column column)

getIndex

public int getIndex()