Top Description Inners Fields Constructors Methods
org.h2.expression

public final Class SimpleCase

extends Expression
Class Inheritance
Imports
org.h2.engine.SessionLocal, org.h2.table.ColumnResolver, .TableFilter, org.h2.value.TypeInfo, .Value, .ValueNull
A simple case.

Nested and Inner Type Summary

Modifier and TypeClass and Description
public static class
SimpleCase.SimpleWhen

Field Summary

Modifier and TypeField and Description
private Expression
elseResult

private Expression
operand

private TypeInfo
type

private SimpleCase.SimpleWhen
when

Inherited from org.h2.expression.Expression:
AUTO_PARENTHESESMAP_IN_AGGREGATEMAP_IN_WINDOWMAP_INITIALWITH_PARENTHESESWITHOUT_PARENTHESES

Constructor Summary

AccessConstructor and Description
public
SimpleCase(Expression operand, SimpleCase.SimpleWhen when, Expression elseResult)

Method Summary

Modifier and TypeMethod and Description
pack-priv static TypeInfo
combineTypes(TypeInfo typeInfo, Expression e)

public int
getCost()

Implements abstract org.h2.expression.Expression.getCost.

Estimate the cost to process the expression.

public Expression
getSubexpression(int
0-based index
index)

Overrides org.h2.expression.Expression.getSubexpression.

Returns subexpression with specified index.

public int
getSubexpressionCount()

Overrides org.h2.expression.Expression.getSubexpressionCount.

Returns count of subexpressions.

public TypeInfo
getType()

Implements abstract org.h2.expression.Expression.getType.

Implements org.h2.value.Typed.getType.

Returns the data type.

public StringBuilder
getUnenclosedSQL(StringBuilder
string builder
builder, int
formatting flags
sqlFlags)

Implements abstract org.h2.expression.Expression.getUnenclosedSQL.

Get the SQL statement of this expression.

public Value
getValue(SessionLocal
the session
session)

Implements abstract org.h2.expression.Expression.getValue.

Return the resulting value for the current row.

public boolean
isEverything(ExpressionVisitor
the visitor
visitor)

Implements abstract org.h2.expression.Expression.isEverything.

Check if this expression and all sub-expressions can fulfill a criteria.

public void
mapColumns(ColumnResolver
the column resolver
resolver, int
the subquery nesting level
level, int
current state for nesting checks, initial value is MAP_INITIAL
state)

Implements abstract org.h2.expression.Expression.mapColumns.

Map the columns of the resolver to expression columns.

public Expression
optimize(SessionLocal
the session
session)

Implements abstract org.h2.expression.Expression.optimize.

Try to optimize the expression.

public void
setEvaluatable(TableFilter
the table filter
tableFilter, boolean
true if the table filter can return value
value)

Implements abstract org.h2.expression.Expression.setEvaluatable.

Tell the expression columns whether the table filter can return values now.

public void
updateAggregate(SessionLocal
the session
session, int
select stage
stage)

Implements abstract org.h2.expression.Expression.updateAggregate.

Update an aggregate value.

Inherited from org.h2.expression.Expression:
addFilterConditionscreateIndexConditionsgetAliasgetBooleanValuegetColumnNamegetColumnNameForViewgetEnclosedSQLgetNonAliasExpressiongetNotIfPossiblegetNullablegetSchemaNamegetSQLgetSQLgetSQLgetSQLgetTableAliasgetTableNamegetTypeIfStaticallyKnowngetWhenSQLgetWhenValueisConstantisIdentityisNullConstantisValueSetisWhenConditionOperandneedParenthesesoptimizeConditiontoStringwriteExpressionswriteExpressions

Field Detail

elseResultback to summary
private Expression elseResult
operandback to summary
private Expression operand
typeback to summary
private TypeInfo type
whenback to summary
private SimpleCase.SimpleWhen when

Constructor Detail

SimpleCaseback to summary
public SimpleCase(Expression operand, SimpleCase.SimpleWhen when, Expression elseResult)

Method Detail

combineTypesback to summary
pack-priv static TypeInfo combineTypes(TypeInfo typeInfo, Expression e)
getCostback to summary
public int getCost()

Implements abstract org.h2.expression.Expression.getCost.

Doc from org.h2.expression.Expression.getCost.

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

Returns:int

the estimated cost

Annotations
@Override
getSubexpressionback to summary
public Expression getSubexpression(int index)

Overrides org.h2.expression.Expression.getSubexpression.

Doc from org.h2.expression.Expression.getSubexpression.

Returns subexpression with specified index.

Parameters
index:int

0-based index

Returns:Expression

subexpression with specified index, may be null

Annotations
@Override
getSubexpressionCountback to summary
public int getSubexpressionCount()

Overrides org.h2.expression.Expression.getSubexpressionCount.

Doc from org.h2.expression.Expression.getSubexpressionCount.

Returns count of subexpressions.

Returns:int

count of subexpressions

Annotations
@Override
getTypeback to summary
public TypeInfo getType()

Implements abstract org.h2.expression.Expression.getType.

Implements org.h2.value.Typed.getType.

Doc from org.h2.expression.Expression.getType.

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

Returns:TypeInfo

the data type

Annotations
@Override
getUnenclosedSQLback to summary
public StringBuilder getUnenclosedSQL(StringBuilder builder, int sqlFlags)

Implements abstract org.h2.expression.Expression.getUnenclosedSQL.

Doc from org.h2.expression.Expression.getUnenclosedSQL.

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

Parameters
builder:StringBuilder

string builder

sqlFlags:int

formatting flags

Returns:StringBuilder

the specified string builder

Annotations
@Override
getValueback to summary
public Value getValue(SessionLocal session)

Implements abstract org.h2.expression.Expression.getValue.

Doc from org.h2.expression.Expression.getValue.

Return the resulting value for the current row.

Parameters
session:SessionLocal

the session

Returns:Value

the result

Annotations
@Override
isEverythingback to summary
public boolean isEverything(ExpressionVisitor visitor)

Implements abstract org.h2.expression.Expression.isEverything.

Doc from org.h2.expression.Expression.isEverything.

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

Parameters
visitor:ExpressionVisitor

the visitor

Returns:boolean

if the criteria can be fulfilled

Annotations
@Override
mapColumnsback to summary
public void mapColumns(ColumnResolver resolver, int level, int state)

Implements abstract org.h2.expression.Expression.mapColumns.

Doc from org.h2.expression.Expression.mapColumns.

Map the columns of the resolver to expression columns.

Parameters
resolver:ColumnResolver

the column resolver

level:int

the subquery nesting level

state:int

current state for nesting checks, initial value is MAP_INITIAL

Annotations
@Override
optimizeback to summary
public Expression optimize(SessionLocal session)

Implements abstract org.h2.expression.Expression.optimize.

Doc from org.h2.expression.Expression.optimize.

Try to optimize the expression.

Parameters
session:SessionLocal

the session

Returns:Expression

the optimized expression

Annotations
@Override
setEvaluatableback to summary
public void setEvaluatable(TableFilter tableFilter, boolean value)

Implements abstract org.h2.expression.Expression.setEvaluatable.

Doc from org.h2.expression.Expression.setEvaluatable.

Tell the expression columns whether the table filter can return values now. This is used when optimizing the query.

Parameters
tableFilter:TableFilter

the table filter

value:boolean

true if the table filter can return value

Annotations
@Override
updateAggregateback to summary
public void updateAggregate(SessionLocal session, int stage)

Implements abstract org.h2.expression.Expression.updateAggregate.

Doc from org.h2.expression.Expression.updateAggregate.

Update an aggregate value. This method is called at statement execution time. It is usually called once for each row, but if the expression is used multiple times (for example in the column list, and as part of the HAVING expression) it is called multiple times - the row counter needs to be used to make sure the internal state is only updated once.

Parameters
session:SessionLocal

the session

stage:int

select stage

Annotations
@Override
org.h2.expression back to summary

public final Class SimpleCase.SimpleWhen

extends Object
Class Inheritance

Field Summary

Modifier and TypeField and Description
pack-priv SimpleCase.SimpleWhen
next

pack-priv Expression[]
operands

pack-priv Expression
result

Constructor Summary

AccessConstructor and Description
public
SimpleWhen(Expression operand, Expression result)

public
SimpleWhen(Expression[] operands, Expression result)

Method Summary

Modifier and TypeMethod and Description
public void
setWhen(SimpleCase.SimpleWhen next)

Inherited from java.lang.Object:
cloneequalsfinalizegetClasshashCodenotifynotifyAlltoStringwaitwaitwait

Field Detail

nextback to summary
pack-priv SimpleCase.SimpleWhen next
operandsback to summary
pack-priv Expression[] operands
resultback to summary
pack-priv Expression result

Constructor Detail

SimpleWhenback to summary
public SimpleWhen(Expression operand, Expression result)
SimpleWhenback to summary
public SimpleWhen(Expression[] operands, Expression result)

Method Detail

setWhenback to summary
public void setWhen(SimpleCase.SimpleWhen next)