com.github.braisdom.objsql.sql.function

类 ClickHouseFunctions

java.lang.Object

com.github.braisdom.objsql.sql.function.IsoFunctions

com.github.braisdom.objsql.sql.function.ClickHouseFunctions

public final class ClickHouseFunctions
extends IsoFunctions

构造器概要

构造器

构造器和说明
ClickHouseFunctions()

方法概要

限定符和类型	方法和说明
static NativeFunction	cast(Expression expression, Expression dataType)
static NativeFunction	dateDiff(Expression unit, Expression startTime, Expression endTime) Returns the difference between two Date or DateTime values.
static NativeFunction	dateDiff(Expression unit, Expression startTime, Expression endTime, Expression timeZone)
static NativeFunction	divide(Expression expression1, Expression expression2) Calculates the quotient of the numbers.
static NativeFunction	formatDateTime(Expression time, Expression formatter) Function formats a Time according given Format string.
static NativeFunction	formatDateTime(Expression time, Expression formatter, Expression timeZone)
static NativeFunction	fromUnixTime(Expression timeStamp) When there is only single argument of integer type, it act in the same way as toDateTime and return DateTime.
static NativeFunction	fromUnixTime(Expression timeStamp, Expression formatter) When there are two arguments, first is integer or DateTime, second is constant format string, it act in the same way as formatDateTime and return String type.
static NativeFunction	intDiv(Expression expression1, Expression expression2) Calculates the quotient of the numbers.
static NativeFunction	intDivOrZero(Expression expression1, Expression expression2) Differs from ‘intDiv’ in that it returns zero when dividing by zero or when dividing a minimal negative number by minus one.
static NativeFunction	minus(Expression expression1, Expression expression2) Calculates the difference.
static NativeFunction	modulo(Expression expression1, Expression expression2) Calculates the remainder after division.
static NativeFunction	moduloOrZero(Expression expression1, Expression expression2) Differs from modulo in that it returns zero when the divisor is zero.
static NativeFunction	multiply(Expression expression1, Expression expression2) Calculates the product of the numbers.
static NativeFunction	now() Accepts zero arguments and returns the current time at one of the moments of request execution.
static NativeFunction	plus(Expression expression1, Expression expression2) Calculates the sum of the numbers.
static NativeFunction	toDate(Expression expression)
static NativeFunction	toDateTime(Expression expression)
static NativeFunction	today() Accepts zero arguments and returns the current date at one of the moments of request execution.
static NativeFunction	toDayOfMonth(Expression expression) Converts a date or date with time to a UInt8 number containing the number of the day of the month (1-31).
static NativeFunction	toDayOfWeek(Expression expression) Converts a date or date with time to a UInt8 number containing the number of the day of the week (Monday is 1, and Sunday is 7).
static NativeFunction	toDayOfYear(Expression expression) Converts a date or date with time to a UInt16 number containing the number of the day of the year (1-366).
static NativeFunction	toDecimal128(Expression value, Expression scale) To see toDecimal32
static NativeFunction	toDecimal32(Expression value, Expression scale) Converts value to the Decimal data type with precision of scale.
static NativeFunction	toDecimal64(Expression value, Expression scale) To see toDecimal32
static NativeFunction	toFloat32(Expression expression)
static NativeFunction	toFloat64(Expression expression)
static NativeFunction	toHour(Expression expression) Converts a date with time to a UInt8 number containing the number of the hour in 24-hour time (0-23).
static NativeFunction	toInt16(Expression expression)
static NativeFunction	toInt32(Expression expression)
static NativeFunction	toInt64(Expression expression)
static NativeFunction	toInt8(Expression expression)
static NativeFunction	toMinute(Expression expression) Converts a date with time to a UInt8 number containing the number of the minute of the hour (0-59).
static NativeFunction	toMonth(Expression expression) Converts a date or date with time to a UInt8 number containing the month number (1-12).
static NativeFunction	toSecond(Expression expression) Converts a date with time to a UInt8 number containing the number of the second in the minute (0-59).
static NativeFunction	toString(Expression expression)
static NativeFunction	toString(Expression expression, Expression formatter) Functions for converting dates, and dates with times.
static NativeFunction	toUInt16(Expression expression)
static NativeFunction	toUInt32(Expression expression)
static NativeFunction	toUInt64(Expression expression)
static NativeFunction	toUInt8(Expression expression)
static NativeFunction	toUnixTimestamp(Expression expression)
static NativeFunction	toUnixTimestamp(Expression expression, Expression timeZone)
static NativeFunction	toYear(Expression expression) Converts a date or date with time to a UInt16 number containing the year number (AD).
static NativeFunction	toYYYYMM(Expression expression) Converts a date or date with time to a UInt32 number containing the year and month number (YYYY * 100 + MM).
static NativeFunction	toYYYYMMDD(Expression expression) Converts a date or date with time to a UInt32 number containing the year and month number (YYYY * 10000 + MM * 100 + DD).
static NativeFunction	toYYYYMMDDhhmmss(Expression expression) Converts a date or date with time to a UInt64 number containing the year and month number (YYYY * 10000000000 + MM * 100000000 + DD * 1000000 + hh * 10000 + mm * 100 + ss).
static NativeFunction	yesterday() Accepts zero arguments and returns yesterday’s date at one of the moments of request execution.

从类继承的方法 com.github.braisdom.objsql.sql.function.IsoFunctions

avg, concat, count, count, countDistinct, If, ltrim, max, min, rtrim, sum, trim

从类继承的方法 java.lang.Object

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

构造器详细资料

ClickHouseFunctions

public ClickHouseFunctions()

方法详细资料

plus

public static NativeFunction plus(Expression expression1,
                                  Expression expression2)

Calculates the sum of the numbers. You can also add integer numbers with a date or date and time. In the case of a date, adding an integer means adding the corresponding number of days. For a date with time, it means adding the corresponding number of seconds.

minus

public static NativeFunction minus(Expression expression1,
                                   Expression expression2)

Calculates the difference. The result is always signed. You can also calculate integer numbers from a date or date with time. The idea is the same – see above for ‘plus’.

multiply

public static NativeFunction multiply(Expression expression1,
                                      Expression expression2)

Calculates the product of the numbers.

divide

public static NativeFunction divide(Expression expression1,
                                    Expression expression2)

Calculates the quotient of the numbers. The result type is always a floating-point type. It is not integer division. For integer division, use the ‘intDiv’ function. When dividing by zero you get ‘inf’, ‘-inf’, or ‘nan’.

intDiv

public static NativeFunction intDiv(Expression expression1,
                                    Expression expression2)

Calculates the quotient of the numbers. Divides into integers, rounding down (by the absolute value). An exception is thrown when dividing by zero or when dividing a minimal negative number by minus one.

intDivOrZero

public static NativeFunction intDivOrZero(Expression expression1,
                                          Expression expression2)

Differs from ‘intDiv’ in that it returns zero when dividing by zero or when dividing a minimal negative number by minus one.

modulo

public static NativeFunction modulo(Expression expression1,
                                    Expression expression2)

Calculates the remainder after division. If arguments are floating-point numbers, they are pre-converted to integers by dropping the decimal portion. The remainder is taken in the same sense as in C++. Truncated division is used for negative numbers. An exception is thrown when dividing by zero or when dividing a minimal negative number by minus one.

moduloOrZero

public static NativeFunction moduloOrZero(Expression expression1,
                                          Expression expression2)

Differs from modulo in that it returns zero when the divisor is zero.

toInt8

public static NativeFunction toInt8(Expression expression)

toInt16

public static NativeFunction toInt16(Expression expression)

toInt32

public static NativeFunction toInt32(Expression expression)

toInt64

public static NativeFunction toInt64(Expression expression)

toUInt8

public static NativeFunction toUInt8(Expression expression)

toUInt16

public static NativeFunction toUInt16(Expression expression)

toUInt32

public static NativeFunction toUInt32(Expression expression)

toUInt64

public static NativeFunction toUInt64(Expression expression)

toFloat32

public static NativeFunction toFloat32(Expression expression)

toFloat64

public static NativeFunction toFloat64(Expression expression)

toDate

public static NativeFunction toDate(Expression expression)

toDateTime

public static NativeFunction toDateTime(Expression expression)

toDecimal32

public static NativeFunction toDecimal32(Expression value,
                                         Expression scale)

Converts value to the Decimal data type with precision of scale.

参数:

value - The value can be a number or a string.

scale - The scale parameter specifies the number of decimal places.

toDecimal64

public static NativeFunction toDecimal64(Expression value,
                                         Expression scale)

To see toDecimal32

toDecimal128

public static NativeFunction toDecimal128(Expression value,
                                          Expression scale)

To see toDecimal32

toString

public static NativeFunction toString(Expression expression)

toString

public static NativeFunction toString(Expression expression,
                                      Expression formatter)

Functions for converting dates, and dates with times.

参数:

expression - the value for converting

formatter - The date and date-with-time formats for the toDate/toDateTime functions are defined as follows: "YYYY-MM-DD" or "YYYY-MM-DD hh:mm:ss"

cast

public static NativeFunction cast(Expression expression,
                                  Expression dataType)

toUnixTimestamp

public static NativeFunction toUnixTimestamp(Expression expression)

参数:

expression - the value of datetime type

toUnixTimestamp

public static NativeFunction toUnixTimestamp(Expression expression,
                                             Expression timeZone)

参数:

expression - the value of String type

timeZone - timeZone like "UTC", "GMT", .etc

toYear

public static NativeFunction toYear(Expression expression)

Converts a date or date with time to a UInt16 number containing the year number (AD).

toMonth

public static NativeFunction toMonth(Expression expression)

Converts a date or date with time to a UInt8 number containing the month number (1-12).

toDayOfYear

public static NativeFunction toDayOfYear(Expression expression)

Converts a date or date with time to a UInt16 number containing the number of the day of the year (1-366).

toDayOfMonth

public static NativeFunction toDayOfMonth(Expression expression)

Converts a date or date with time to a UInt8 number containing the number of the day of the month (1-31).

toDayOfWeek

public static NativeFunction toDayOfWeek(Expression expression)

Converts a date or date with time to a UInt8 number containing the number of the day of the week (Monday is 1, and Sunday is 7).

toHour

public static NativeFunction toHour(Expression expression)

Converts a date with time to a UInt8 number containing the number of the hour in 24-hour time (0-23).

toMinute

public static NativeFunction toMinute(Expression expression)

Converts a date with time to a UInt8 number containing the number of the minute of the hour (0-59).

toSecond

public static NativeFunction toSecond(Expression expression)

Converts a date with time to a UInt8 number containing the number of the second in the minute (0-59).

now

public static NativeFunction now()

Accepts zero arguments and returns the current time at one of the moments of request execution.

today

public static NativeFunction today()

Accepts zero arguments and returns the current date at one of the moments of request execution. The same as ‘toDate(now())’.

yesterday

public static NativeFunction yesterday()

Accepts zero arguments and returns yesterday’s date at one of the moments of request execution. The same as ‘today() - 1’.

toYYYYMM

public static NativeFunction toYYYYMM(Expression expression)

Converts a date or date with time to a UInt32 number containing the year and month number (YYYY * 100 + MM).

toYYYYMMDD

public static NativeFunction toYYYYMMDD(Expression expression)

Converts a date or date with time to a UInt32 number containing the year and month number (YYYY * 10000 + MM * 100 + DD).

toYYYYMMDDhhmmss

public static NativeFunction toYYYYMMDDhhmmss(Expression expression)

Converts a date or date with time to a UInt64 number containing the year and month number (YYYY * 10000000000 + MM * 100000000 + DD * 1000000 + hh * 10000 + mm * 100 + ss).

dateDiff

public static NativeFunction dateDiff(Expression unit,
                                      Expression startTime,
                                      Expression endTime)

Returns the difference between two Date or DateTime values.

参数:

unit - Time unit, in which the returned value is expressed. Supported values: second, minute, hour, day, week, month, quarter, year

startTime - The first time value to compare. Date or DateTime.

endTime - The second time value to compare. Date or DateTime.

dateDiff

public static NativeFunction dateDiff(Expression unit,
                                      Expression startTime,
                                      Expression endTime,
                                      Expression timeZone)

参数:

timeZone - If specified, it is applied to both startdate and enddate. If not specified, timezones of startdate and enddate are used. If they are not the same, the result is unspecified.

formatDateTime

public static NativeFunction formatDateTime(Expression time,
                                            Expression formatter)

Function formats a Time according given Format string. N.B.: Format is a constant expression, e.g. you can not have multiple formats for single result column.

formatDateTime

public static NativeFunction formatDateTime(Expression time,
                                            Expression formatter,
                                            Expression timeZone)

参数:

timeZone - timeZone like "UTC", "GMT", .etc

fromUnixTime

public static NativeFunction fromUnixTime(Expression timeStamp)

When there is only single argument of integer type, it act in the same way as toDateTime and return DateTime.

参数:

timeStamp - argument of integer type

fromUnixTime

public static NativeFunction fromUnixTime(Expression timeStamp,
                                          Expression formatter)

When there are two arguments, first is integer or DateTime, second is constant format string, it act in the same way as formatDateTime and return String type.

参数:

timeStamp - argument of integer type

formatter - constant format string