Class FunctionsMySQL

java.lang.Object

org.h2.expression.Expression

org.h2.expression.OperationN

org.h2.expression.function.FunctionN

org.h2.mode.ModeFunction

org.h2.mode.FunctionsMySQL

All Implemented Interfaces:

ExpressionWithVariableParameters, NamedExpression, HasSQL, Typed

public final class FunctionsMySQL
extends ModeFunction

This class implements some MySQL-specific functions.

Field Summary

Fields

Modifier and Type	Field	Description
private static final int	DATE
private static final String	DATE_TIME_FORMAT	The date format of a MySQL formatted date/time.
private static final String[]	FORMAT_REPLACE	Format replacements for MySQL date formats.
private static final int	FROM_UNIXTIME
private static final HashMap<String, FunctionInfo>	FUNCTIONS
private static final int	LAST_INSERT_ID
private static final int	UNIX_TIMESTAMP

Fields inherited from class ModeFunction

info, VAR_ARGS

Fields inherited from class OperationN

args, argsCount, type

Fields inherited from class Expression

AUTO_PARENTHESES, MAP_IN_AGGREGATE, MAP_IN_WINDOW, MAP_INITIAL, WITH_PARENTHESES, WITHOUT_PARENTHESES

Fields inherited from interface 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
FunctionsMySQL(FunctionInfo info)

Method Summary

Modifier and Type	Method	Description
protected void	checkParameterCount(int len)	Check if the parameter count is correct.
private static String	convertToSimpleDateFormat(String format)
static String	fromUnixTime(int seconds)	See https://dev.mysql.com/doc/refman/5.1/en/date-and-time-functions.html#function_from-unixtime
static String	fromUnixTime(int seconds, String format)	See https://dev.mysql.com/doc/refman/5.1/en/date-and-time-functions.html#function_from-unixtime
static FunctionsMySQL	getFunction(String upperName)	Returns mode-specific function for a given name, or null.
Value	getValue(SessionLocal session)	Return the resulting value for the current row.
Expression	optimize(SessionLocal session)	Try to optimize the expression.
static int	unixTimestamp(SessionLocal session, Value value)	Get the seconds since 1970-01-01 00:00:00 UTC of the given timestamp.

Methods inherited from class ModeFunction

doneWithParameters, getArgumentsValues, getFunction, getName, getNullOrValue, isEverything, optimizeArguments

Methods inherited from class FunctionN

getUnenclosedSQL, getValue

Methods inherited from class OperationN

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

Methods inherited from class 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

Methods inherited from class Object

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

Methods inherited from interface HasSQL

getTraceSQL

Field Details

UNIX_TIMESTAMP

private static final int UNIX_TIMESTAMP

See Also:

• Constant Field Values

FROM_UNIXTIME

private static final int FROM_UNIXTIME

See Also:

• Constant Field Values

DATE

private static final int DATE

See Also:

• Constant Field Values

LAST_INSERT_ID

private static final int LAST_INSERT_ID

See Also:

• Constant Field Values

FUNCTIONS

private static final HashMap<String, FunctionInfo> FUNCTIONS

DATE_TIME_FORMAT

private static final String DATE_TIME_FORMAT

The date format of a MySQL formatted date/time. Example: 2008-09-25 08:40:59

See Also:

• Constant Field Values

FORMAT_REPLACE

private static final String[] FORMAT_REPLACE

Format replacements for MySQL date formats. See https://dev.mysql.com/doc/refman/5.1/en/date-and-time-functions.html#function_date-format

Constructor Details

FunctionsMySQL

FunctionsMySQL(FunctionInfo info)

Method Details

unixTimestamp

public static int unixTimestamp(SessionLocal session,
 Value value)

Get the seconds since 1970-01-01 00:00:00 UTC of the given timestamp. See https://dev.mysql.com/doc/refman/8.0/en/date-and-time-functions.html#function_unix-timestamp

Parameters:

session - the session

value - the timestamp

Returns:

the timestamp in seconds since EPOCH

fromUnixTime

public static String fromUnixTime(int seconds)

See https://dev.mysql.com/doc/refman/5.1/en/date-and-time-functions.html#function_from-unixtime

Parameters:

seconds - The current timestamp in seconds.

Returns:

a formatted date/time String in the format "yyyy-MM-dd HH:mm:ss".

fromUnixTime

public static String fromUnixTime(int seconds,
 String format)

See https://dev.mysql.com/doc/refman/5.1/en/date-and-time-functions.html#function_from-unixtime

Parameters:

seconds - The current timestamp in seconds.

format - The format of the date/time String to return.

Returns:

a formatted date/time String in the given format.

convertToSimpleDateFormat

private static String convertToSimpleDateFormat(String format)

getFunction

public static FunctionsMySQL getFunction(String upperName)

Returns mode-specific function for a given name, or null.

Parameters:

upperName - the upper-case name of a function

Returns:

the function with specified name or null

checkParameterCount

protected void checkParameterCount(int len)

Description copied from class: ModeFunction

Check if the parameter count is correct.

Overrides:

checkParameterCount in class ModeFunction

Parameters:

len - the number of parameters set

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

getValue

public Value getValue(SessionLocal session)

Description copied from class: Expression

Return the resulting value for the current row.

Overrides:

getValue in class FunctionN

Parameters:

session - the session

Returns:

the result