I have a function which checks two values for equality and returns . I am using it to update only the changed columns. I have a varbinary ( max) column which i want to compare.
CREATE FUNCTION [dbo].[GetIfValuesEqual]
(
#value1 VARCHAR(MAX) ,
#value2 VARCHAR(MAX)
)
RETURNS BIT
AS
BEGIN
DECLARE #result BIT
IF #value1 IS NULL
AND #value2 IS NULL
SET #result = 0
IF #value1 IS NULL
AND #value2 IS NOT NULL
SET #result = 1
IF #value1 IS NOT NULL
AND #value2 IS NULL
SET #result = 1
IF #value1 = #value2
SET #result = 0
IF #value1 <> #value2
SET #result = 1
RETURN #result
END
GO
Whenever i use it to compare
DECLARE #PatientChartImage AS VARBINARY(MAX)
DECLARE #PatientChartImageActual AS VARBINARY(MAX)
SELECT #PatientChartImage=PatientChartImage,#PatientChartImageActual='Same Binary'
IF dbo.GetIfValuesEqual(#PatientChartImage, #PatientChartImageActual) = 1
BEGIN
PRINT 'Equal'
END
ELSE
BEGIN
PRINT 'unEqual'
END
Even if #PatientChartImage and #PatientChartImageActual are exactly same binary, this code still prints unEqual. Is there any other way of comparing varBinary(max). Please suggest.
Related
I am just learning to code SQL. Can someone help me with an update statement, I have done the insert but am stuck with an update. My table prime_test has two columns number and is_prime
Here is the question:
Write one or more update statements that sets the 'is_prime' column for each associated integer. For a prime, the column should read 'prime'. For non-primes, the column should read 'composite'.
My code
CREATE TABLE `sql_inventory`.`prime_test` (
`number` INT NOT NULL,
`is_prime` VARCHAR(50) NULL,
PRIMARY KEY (`number`));
INSERT INTO `prime`.`prime_test`
(`number`)
VALUES
(rand()*(100-2+1)+2);
Function to find the prime numbers:
CREATE FUNCTION isPrime(#num int)
RETURNS VARCHAR(50)
BEGIN
DECLARE #prime_or_notPrime INT
DECLARE #counter INT
DECLARE #retVal VARCHAR(50)
SET #retVal = 'composite'
SET #prime_or_notPrime = 1
SET #counter = 2
WHILE (#counter <= #number/2 )
BEGIN
IF (( #number % #counter) = 0 )
BEGIN
set #prime_or_notPrime = 0
BREAK
END
IF (#prime_or_notPrime = 1 )
BEGIN
SET #retVal = 'prime'
END
SET #counter = #counter + 1
END
return #retVal
END
update prime_test
set is_prime = dbo.isPrime(select number From 'prime'.'prime_test')
I need the following output in SQL server 2008
problem is to remove numbers from string
i.e column name is associated_id which is nvarchar type and value could be (23,34,45)
But I want the following result (23,45).
May this help
CREATE FUNCTION [dbo].[GetAlphabetFromAlphaNumeric]
(#strAlphaNumeric VARCHAR(500))
RETURNS VARCHAR(500)
AS
BEGIN
DECLARE #intAlpha INT
SET #intAlpha = PATINDEX('%[0-9]%', #strAlphaNumeric)
BEGIN
WHILE #intAlpha > 0
BEGIN
SET #strAlphaNumeric = STUFF(#strAlphaNumeric, #intAlpha, 1, '' )
SET #intAlpha = PATINDEX('%[0-9]%', #strAlphaNumeric )
END
END
RETURN ISNULL(#strAlphaNumeric,0)
END
I have a stored procedure where input is a comma separated string say '12341,34567,12446,12997' and it is not sure that the input string always carries numerical data. It may be '12341,34as67,12$46,1we97' so I need to validate them and use only the valid data in query.
Say my query is (Where the column OrderCode is int type)
select * from dbo.DataCollector where OrderCode in (12341,34567,12446,12997)
or only the valid data if other are invalid
select * from dbo.DataCollector where OrderCode in (12341)
For such situation what would be a good solution.
One way that works also in SQl-Server 2005 would be to create a split-function, then you can use ISNUMERIC to check if it's a number:
DECLARE #Input VARCHAR(MAX) = '12341,34as67,12$46,1we97'
SELECT i.Item FROM dbo.Split(#Input, ',')i
WHERE IsNumeric(i.Item) = 1
Demo
Your complete query:
select * from dbo.DataCollector
where OrderCode in ( SELECT i.Item FROM dbo.Split(#Input, ',')i
WHERE IsNumeric(i.Item) = 1 )
Here is the split-function which i use:
CREATE FUNCTION [dbo].[Split]
(
#ItemList NVARCHAR(MAX),
#delimiter CHAR(1)
)
RETURNS #ItemTable TABLE (Item VARCHAR(250))
AS
BEGIN
DECLARE #tempItemList NVARCHAR(MAX)
SET #tempItemList = #ItemList
DECLARE #i INT
DECLARE #Item NVARCHAR(4000)
SET #i = CHARINDEX(#delimiter, #tempItemList)
WHILE (LEN(#tempItemList) > 0)
BEGIN
IF #i = 0
SET #Item = #tempItemList
ELSE
SET #Item = LEFT(#tempItemList, #i - 1)
INSERT INTO #ItemTable(Item) VALUES(#Item)
IF #i = 0
SET #tempItemList = ''
ELSE
SET #tempItemList = RIGHT(#tempItemList, LEN(#tempItemList) - #i)
SET #i = CHARINDEX(#delimiter, #tempItemList)
END
RETURN
END
Edit according to the comment of Damien that ISNUMERIC has it's issues. You can use this function to check if it's a real integer:
CREATE FUNCTION dbo.IsInteger(#Value VarChar(18))
RETURNS Bit
AS
BEGIN
RETURN IsNull(
(Select Case When CharIndex('.', #Value) > 0
Then Case When Convert(int, ParseName(#Value, 1)) <> 0
Then 0
Else 1
End
Else 1
End
Where IsNumeric(#Value + 'e0') = 1), 0)
END
Here is another example with damien's "bad" input which contains £ and 0d0:
Demo
I have the following table with each row having comma-separated values:
ID
-----------------------------------------------------------------------------
10031,10042
10064,10023,10060,10065,10003,10011,10009,10012,10027,10004,10037,10039
10009
20011,10027,10032,10063,10023,10033,20060,10012,10020,10031,10011,20036,10041
I need to get a count for each ID (a groupby).
I am just trying to avoid cursor implementation and stumped on how to do this without cursors.
Any Help would be appreciated !
You will want to use a split function:
create FUNCTION [dbo].[Split](#String varchar(MAX), #Delimiter char(1))
returns #temptable TABLE (items varchar(MAX))
as
begin
declare #idx int
declare #slice varchar(8000)
select #idx = 1
if len(#String)<1 or #String is null return
while #idx!= 0
begin
set #idx = charindex(#Delimiter,#String)
if #idx!=0
set #slice = left(#String,#idx - 1)
else
set #slice = #String
if(len(#slice)>0)
insert into #temptable(Items) values(#slice)
set #String = right(#String,len(#String) - #idx)
if len(#String) = 0 break
end
return
end;
And then you can query the data in the following manner:
select items, count(items)
from table1 t1
cross apply dbo.split(t1.id, ',')
group by items
See SQL Fiddle With Demo
Well, the solution i always use, and probably there might be a better way, is to use a function that will split everything. No use for cursors, just a while loop.
if OBJECT_ID('splitValueByDelimiter') is not null
begin
drop function splitValueByDelimiter
end
go
create function splitValueByDelimiter (
#inputValue varchar(max)
, #delimiter varchar(1)
)
returns #results table (value varchar(max))
as
begin
declare #delimeterIndex int
, #tempValue varchar(max)
set #delimeterIndex = 1
while #delimeterIndex > 0 and len(isnull(#inputValue, '')) > 0
begin
set #delimeterIndex = charindex(#delimiter, #inputValue)
if #delimeterIndex > 0
set #tempValue = left(#inputValue, #delimeterIndex - 1)
else
set #tempValue = #inputValue
if(len(#tempValue)>0)
begin
insert
into #results
select #tempValue
end
set #inputValue = right(#inputValue, len(#inputValue) - #delimeterIndex)
end
return
end
After that you can call the output like this :
if object_id('test') is not null
begin
drop table test
end
go
create table test (
Id varchar(max)
)
insert
into test
select '10031,10042'
union all select '10064,10023,10060,10065,10003,10011,10009,10012,10027,10004,10037,10039'
union all select '10009'
union all select '20011,10027,10032,10063,10023,10033,20060,10012,10020,10031,10011,20036,10041'
select value
from test
cross apply splitValueByDelimiter(Id, ',')
Hope it helps, although i am still looping through everything
After reiterating the comment above about NOT putting multiple values into a single column (Use a separate child table with one value per row!),
Nevertheless, one possible approach: use a UDF to convert delimited string to a table. Once all the values have been converted to tables, combine all the tables into one table and do a group By on that table.
Create Function dbo.ParseTextString (#S Text, #delim VarChar(5))
Returns #tOut Table
(ValNum Integer Identity Primary Key,
sVal VarChar(8000))
As
Begin
Declare #dlLen TinyInt -- Length of delimiter
Declare #wind VarChar(8000) -- Will Contain Window into text string
Declare #winLen Integer -- Length of Window
Declare #isLastWin TinyInt -- Boolean to indicate processing Last Window
Declare #wPos Integer -- Start Position of Window within Text String
Declare #roVal VarChar(8000)-- String Data to insert into output Table
Declare #BtchSiz Integer -- Maximum Size of Window
Set #BtchSiz = 7900 -- (Reset to smaller values to test routine)
Declare #dlPos Integer -- Position within Window of next Delimiter
Declare #Strt Integer -- Start Position of each data value within Window
-- -------------------------------------------------------------------------
-- ---------------------------
If #delim is Null Set #delim = '|'
If DataLength(#S) = 0 Or
Substring(#S, 1, #BtchSiz) = #delim Return
-- --------------------------------------------
Select #dlLen = DataLength(#delim),
#Strt = 1, #wPos = 1,
#wind = Substring(#S, 1, #BtchSiz)
Select #winLen = DataLength(#wind),
#isLastWin = Case When DataLength(#wind) = #BtchSiz
Then 0 Else 1 End,
#dlPos = CharIndex(#delim, #wind, #Strt)
-- --------------------------------------------
While #Strt <= #winLen
Begin
If #dlPos = 0 Begin -- No More delimiters in window
If #isLastWin = 1 Set #dlPos = #winLen + 1
Else Begin
Set #wPos = #wPos + #Strt - 1
Set #wind = Substring(#S, #wPos, #BtchSiz)
-- ----------------------------------------
Select #winLen = DataLength(#wind), #Strt = 1,
#isLastWin = Case When DataLength(#wind) = #BtchSiz
Then 0 Else 1 End,
#dlPos = CharIndex(#delim, #wind, 1)
If #dlPos = 0 Set #dlPos = #winLen + 1
End
End
-- -------------------------------
Insert #tOut (sVal)
Select LTrim(Substring(#wind,
#Strt, #dlPos - #Strt))
-- -------------------------------
-- Move #Strt to char after last delimiter
Set #Strt = #dlPos + #dlLen
Set #dlPos = CharIndex(#delim, #wind, #Strt)
End
Return
End
Then write, (using your table schema),
Declare #AllVals VarChar(8000)
Select #AllVals = Coalesce(#allVals + ',', '') + ID
From Table Where ID Is Not null
-- -----------------------------------------
Select sVal, Count(*)
From dbo.ParseTextString(#AllVals, ',')
Group By sval
I'm working on a project involving C# and a SQL Server 2008 database.
In one of the tables, I have a field (nvarchar(15)) which will contain an IP address.
I'd like to add a check constraint which will validate that the input value is actually an IP address.
I wanted to use a regex to do that, but it seems that this feature is not supported by default. I saw things about writing a customm dll with UDF inside (MSDN tutorial), but I don't really understand how it works (i.e. where should I place the dll ?)
Is there a "simple" way to add such a constraint ?
Any solution is welcome.
Thanks in advance !
There are several way of doing this - the most performant one would probably be a CLR function in the database.
This is because SQL has fairly poor text manipulation tooling and no native RegEx in SQL Server.
As other have said, this is better handled by an application before insertion to the DB.
It shouldn't be handled in the database, it should be handled first and foremost in the application.
There's no harm in then adding a check to the database, but leaving it up to the DB to filter input is very sketchy.
The easiest way I can think of is to create a function like fnCheckIP and use this function in the constraint.
There's no need to use UDF.
create function fnCheckIP(#ip varchar(15)) returns bit
AS
begin
if (#ip is null)
return null
declare #num1 int
declare #num varchar(15)
declare #pos int
while (#ip is not null)
begin
set #pos = IsNull(NullIf(charindex('.', #ip), 0), Len(#ip) + 1)
set #num = substring(#ip, 1, #pos - 1)
if (isnumeric(#num) = 0) or (not cast(#num as int) between 0 and 255)
return cast(0 as bit)
if (len(#ip) - #pos <= 0)
set #ip = null
else
set #ip = NullIf(substring(#ip, #pos + 1, len(#ip) - #pos), '')
end
return cast (1 as bit)
end
go
select dbo.fnCheckIP('127.0.0.1')
select dbo.fnCheckIP('127.0.0.300')
This solution is similar to Paulo's but using either approach will require getting rid of the comma character because isnumeric allows commas which will throw a cast to int error.
CREATE FUNCTION fn_ValidateIP
(
#ip varchar(255)
)
RETURNS int
AS
BEGIN
DECLARE #Result int = 0
IF
#ip not like '%,%' and
len(#ip) <= 15 and
isnumeric(PARSENAME(#ip,4)) = 1 and
isnumeric(PARSENAME(#ip,3)) = 1 and
isnumeric(PARSENAME(#ip,2)) = 1 and
isnumeric(PARSENAME(#ip,1)) = 1 and
cast(PARSENAME(#ip,4) as int) between 1 and 255 and
cast(PARSENAME(#ip,3) as int) between 0 and 255 and
cast(PARSENAME(#ip,2) as int) between 0 and 255 and
cast(PARSENAME(#ip,1) as int) between 0 and 255
set #Result = 1
ELSE
set #Result = 0
RETURN #Result
END
select dbo.fn_ValidateIP('127.0.0.1')
This may not be entirely practical, but one way would be to store the converted string ###-###-###-### into a binary(4) data type. Let the interface fuss around with hyphens and deal with converting the four numbers to binary and back (and this could probably even be done by a caluclated column.) A bit extreme, yes, but with binary(4) you will always be able to turn it into an IP address.
At last about 10 yrs after Oracle, sqlserver got native compilation (with limitations)
ALTER function fn_ValidateIPv4
(
#ip varchar(255)
)
RETURNS int
--WITH EXECUTE AS OWNER, SCHEMABINDING, NATIVE_COMPILATION
AS
BEGIN
--ATOMIC WITH (TRANSACTION ISOLATION LEVEL = SNAPSHOT, LANGUAGE = N'us_english')
/* only sql2016 native Compilation **/
DECLARE #len_ip as int;
SET #len_ip = len(#ip);
DECLARE #firstBlock varchar(4) = '';
DECLARE #secondBlock varchar(4) = '';
DECLARE #thirdBlock varchar(4) = '';
DECLARE #fourthBlock varchar(4) = '';
DECLARE #countDot as smallint = 0;
DECLARE #l_i as smallint = 0;
DECLARE #l_curChar varchar(1) = 'X';
DECLARE #Result int = 0
IF (#len_ip <= 15)
BEGIN
WHILE (#l_i < #len_ip)
BEGIN
set #l_i += 1;
set #l_curChar = substring(#ip,#l_i,1);
if #l_curChar = '.'
SET #countDot += 1
ELSE
BEGIN
IF #l_curChar IN ( '0','1','2','3','4','5','6','7','8','9' )
BEGIN
IF #countDot = 0
SET #firstBlock = #firstBlock + #l_curChar;
IF #countDot = 1
SET #secondBlock = #secondBlock + #l_curChar;
IF #countDot = 2
SET #thirdBlock = #thirdBlock + #l_curChar;
IF #countDot = 3
SET #fourthBlock = #fourthBlock + #l_curChar;
IF #countDot > 3
set #firstBlock = 'AAA'; -- force error
END
ELSE set #firstBlock = 'AAA'; -- force error
END;
END;
IF ( #countDot = 3 and
cast(#fourthBlock as int) between 1 and 255 and
cast(#thirdBlock as int) between 0 and 255 and
cast(#secondBlock as int) between 0 and 255 and
cast(#firstBlock as int) between 0 and 255
)
set #Result = 1;
END;
/*
select dbo.fn_ValidateIPv4( '127.0.0.258' );
*/
RETURN #Result
END;
I had to remove not de-supported built functions isnumeric etc...