Package org.h2.expression

Class Format

java.lang.Object

org.h2.expression.Expression

org.h2.expression.Operation1

org.h2.expression.Format

All Implemented Interfaces:

HasSQL, Typed

public final class Format
extends Operation1

A format clause such as FORMAT JSON.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static enum	Format.FormatEnum	Supported formats.

Field Summary

Fields inherited from class org.h2.expression.Operation1

arg, 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

Constructor Summary

Constructors

Constructor	Description
Format(Expression arg, Format.FormatEnum format)

Method Summary

Modifier and Type	Method	Description
static Value	applyJSON(Value value)	Applies the JSON format to the specified value.
String	getColumnName(SessionLocal session, int columnIndex)	Get the column name or alias name of this expression.
int	getNullable()	Check whether this expression is a column and can store NULL.
String	getTableName()	Get the table name, or null
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.
Value	getValue(Value value)	Returns the value with applied format.
boolean	isIdentity()	Check if this is an identity column.
Expression	optimize(SessionLocal session)	Try to optimize the expression.

Methods inherited from class org.h2.expression.Operation1

getCost, getSubexpression, getSubexpressionCount, getType, isEverything, mapColumns, setEvaluatable, updateAggregate

Methods inherited from class org.h2.expression.Expression

addFilterConditions, createIndexConditions, getAlias, getBooleanValue, getColumnNameForView, getEnclosedSQL, getNonAliasExpression, getNotIfPossible, getSchemaName, getSQL, getSQL, getSQL, getSQL, getTableAlias, getTypeIfStaticallyKnown, getWhenSQL, getWhenValue, isConstant, 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

Constructor Details

Format

public Format(Expression arg,
 Format.FormatEnum format)

Method Details

getValue

public Value getValue(SessionLocal session)

Description copied from class: Expression

Return the resulting value for the current row.

Specified by:

getValue in class Expression

Parameters:

session - the session

Returns:

the result

getValue

public Value getValue(Value value)

Returns the value with applied format.

Parameters:

value - the value

Returns:

the value with applied format

applyJSON

public static Value applyJSON(Value value)

Applies the JSON format to the specified value.

Parameters:

value - the value

Returns:

the value with applied format

optimize

public Expression optimize(SessionLocal session)

Description copied from class: Expression

Try to optimize the expression.

Specified by:

optimize in class Expression

Parameters:

session - the session

Returns:

the optimized expression

isIdentity

public boolean isIdentity()

Description copied from class: Expression

Check if this is an identity column.

Overrides:

isIdentity in class Expression

Returns:

true if it is an identity column

getUnenclosedSQL

public StringBuilder getUnenclosedSQL(StringBuilder builder,
 int sqlFlags)

Description copied from class: 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.

Specified by:

getUnenclosedSQL in class Expression

Parameters:

builder - string builder

sqlFlags - formatting flags

Returns:

the specified string builder

getNullable

public int getNullable()

Description copied from class: Expression

Check whether this expression is a column and can store NULL.

Overrides:

getNullable in class Expression

Returns:

whether NULL is allowed

getTableName

public String getTableName()

Description copied from class: Expression

Get the table name, or null

Overrides:

getTableName in class Expression

Returns:

the table name

getColumnName

public String getColumnName(SessionLocal session,
 int columnIndex)

Description copied from class: Expression

Get the column name or alias name of this expression.

Overrides:

getColumnName in class Expression

Parameters:

session - the session

columnIndex - 0-based column index

Returns:

the column name