Hello in a stored procedure, i create a temp-table filled with a select wich execute a function to return date recurrences.
The creation of my temp table looks like this :
BEGIN
insert into #tmp_recu
SELECT * FROM dbo.CrontabSchedule('0 0 * * *', '2017-2-1', '2017-2-28')
END
After creating this temp-table, i execute a query using this temp table like this :
Select * from mission
Cross Join #temp_recu
The problem is i'd like to remplace the '0 0 * * *' in my temp-table creation by a field from mission table (field named recurrence), so how could i do that?
Thanks !
EDIT
Actually, in my query, i'd like to call the function 'CrontabSchedule' and put in parameter a field from 'mission' table like this :
select * from mission m
cross join select * from dbo.CronTabSchedule(mission.reccurence,'2017-1-1','2017-1-31')
It works when i called the function like this
select * from dbo.CronTabSchedule('0 0 * * *','2017-1-1','2017-1-31')
But when i replace '0 0 * * *' by 'Mission.recurrence' (which contains the recurrence pattern of each mission), i have an error :
The multi-part identifier "Mission.recurrence" could not be bound.
CrontabSchedule code :
SET ANSI_NULLS OFF
GO
SET QUOTED_IDENTIFIER OFF
GO
ALTER FUNCTION [dbo].[CrontabSchedule](#Expression [nvarchar](100), #Start[datetime], #End [datetime])
RETURNS TABLE (
[Occurrence] [datetime] NULL
) WITH EXECUTE AS CALLER
AS
EXTERNAL NAME [NCrontabSQL].[NContab.SQL.SqlCrontab].[GetOccurrences]
The function return a table with one column named 'Occurence' and contains à list of dates.
Pretty vague question here but I am assuming that CronTabSchedule must be a table valued function (hopefully an inline version but that is another topic). If I am correct you could use CROSS APPLY for this quite easily.
select *
from mission m
cross apply dbo.CronTabSchedule(m.reccurence,'2017-1-1','2017-1-31') cts
Related
I am working on a sql database which will provide with data some grid. The grid will enable filtering, sorting and paging but also there is a strict requirement that users can enter free text to a text input above the grid for example
'Engine 1001 Requi' and that the result will contain only rows which in some columns contain all the pieces of the text. So one column may contain Engine, other column may contain 1001 and some other will contain Requi.
I created a technical column (let's call it myTechnicalColumn) in the table (let's call it myTable) which will be updated each time someone inserts or updates a row and it will contain all the values of all the columns combined and separated with space.
Now to use it with entity framework I decided to use a table valued function which accepts one parameter #searchQuery and it will handle it like this:
CREATE FUNCTION myFunctionName(#searchText NVARCHAR(MAX))
RETURNS #Result TABLE
( ... here come columns )
AS
BEGIN
DECLARE #searchToken TokenType
INSERT INTO #searchToken(token) SELECT value FROM STRING_SPLIT(#searchText,' ')
DECLARE #searchTextLength INT
SET #searchTextLength = (SELECT COUNT(*) FROM #searchToken)
INSERT INTO #Result
SELECT
... here come columns
FROM myTable
WHERE (SELECT COUNT(*) FROM #searchToken WHERE CHARINDEX(token, myTechnicalColumn) > 0) = #searchTextLength
RETURN;
END
Of course the solution works fine but it's kinda slow. Any hints how to improve its efficiency?
You can use an inline Table Valued Function, which should be quite a lot faster.
This would be a direct translation of your current code
CREATE FUNCTION myFunctionName(#searchText NVARCHAR(MAX))
RETURNS TABLE
AS RETURN
(
WITH searchText AS (
SELECT value token
FROM STRING_SPLIT(#searchText,' ') s(token)
)
SELECT
... here come columns
FROM myTable t
WHERE (
SELECT COUNT(*)
FROM searchText
WHERE CHARINDEX(s.token, t.myTechnicalColumn) > 0
) = (SELECT COUNT(*) FROM searchText)
);
GO
You are using a form of query called Relational Division Without Remainder and there are other ways to cut this cake:
CREATE FUNCTION myFunctionName(#searchText NVARCHAR(MAX))
RETURNS TABLE
AS RETURN
(
WITH searchText AS (
SELECT value token
FROM STRING_SPLIT(#searchText,' ') s(token)
)
SELECT
... here come columns
FROM myTable t
WHERE NOT EXISTS (
SELECT 1
FROM searchText
WHERE CHARINDEX(s.token, t.myTechnicalColumn) = 0
)
);
GO
This may be faster or slower depending on a number of factors, you need to test.
Since there is no data to test, i am not sure if the following will solve your issue:
-- Replace the last INSERT portion
INSERT INTO #Result
SELECT
... here come columns
FROM myTable T
JOIN #searchToken S ON CHARINDEX(S.token, T.myTechnicalColumn) > 0
I am working with different versions of SQL Server: SQL Server 2008 R2 and SQL Server 2016.
I want to search a specific text employee_project in all stored stored procedures / functions / triggers / views.
So I wrote this query:
select *
from sys.object so
inner join sys.sql_modules ssm on so.object_id = ssm.object_id
where ssm.definition like '%employee_project%'
The above query is working fine.
Now I want to list only the lines where the specific text employee_project occur.
For example suppose there is a stored procedure ProcessProject which has the specific text employee_project on 3 different lines this way:
select id from employee_project where name = #proj_name
/* employee_project is validated */
-- employee_project was updated
Then the new query should return the above 3 lines, along with the name of the concerned stored procedure / function / trigger / view. How can I do that?
object_name line
--------------------------------------------------------------------------
ProcessProject select id from employee_project where name = #proj_name
ProcessProject /* employee_project is validated */
ProcessProject -- employee_project was updated
I doubt, that this is the best tool for it... You might transfer your result to a table and introduce full text search...
But you might try this: The function splits any string input at the given search-string and returns the fragments, starting with the search string.
CREATE FUNCTION dbo.StrangeSplitter(#SplitThis NVARCHAR(MAX),#FindThis NVARCHAR(MAX))
RETURNS TABLE
AS
RETURN
WITH Casted AS
(
SELECT CAST('<x>' + REPLACE((SELECT #SplitThis AS [*] FOR XML PATH('')),#FindThis,'</x><x>') + '</x>' AS XML) AS Splitted
)
SELECT ROW_NUMBER() OVER(ORDER BY (SELECT NULL)) AS FindIndex
,#FindThis + ' ' + x.value('text()[1]','nvarchar(max)') AS YourFragment
FROM Casted
CROSS APPLY Splitted.nodes('/x') AS A(x)
GO
--Try it with a single string, but the same can be used within a SELECT calling this function with CROSS APPLY:
DECLARE #SearchIn NVARCHAR(MAX)=
N'select id from employee_project where name = #proj_name
Some other text
blah blah
/* employee_project is validated */
More blah
-- employee_project was updated
And even more blah!';
DECLARE #SearchFor NVARCHAR(MAX)=N'employee_project';
SELECT * FROM dbo.StrangeSplitter(#SearchIn,#SearchFor)
WHERE FindIndex>1;
Go
DROP FUNCTION dbo.StrangeSplitter;
Alternatively split on line breaks
You can use the same approach to return the text line by line, if you use the splitter with CHAR(13)+CHAR(10) an filter the result with LIKE. This would return all rows containing the search string.
Hint
If you are on SQL-Server 2016+ you can call STRING_SPLIT()
I get a list of elments from R and I have to obtain the records from database that belong to a the list of elements.
INPUT:
'12345','23456', '34567', '45678'
PROCEDURE:
CREATE PROCEDURE "SCHEMA"."GET_RECORDS" (IN LIST (Type), OUT RECORDS tt_records)
LANGUAGE SQLSCRIPT
SQL SECURITY INVOKER
READS SQL DATA AS
BEGIN
RECORDS = select * from TABLE where ids in :LIST
END;
How can I provide such a list to the proceudre?
Handing over lists of parameters to SQLScript is a bit tricky as there is no straight-forward native construct for that.
One way to do it is to use the APPLY_FILTER function and to "smuggle" the list as a string parameter.
In my example I read from a table CUSERS and I create a filter condition for APPLY_FILTER that filters column USER_ID via an IN ( ) clause.
Removing the single quotes (' ') from the list is to avoid implicit type conversion when executing the query. Leaving the single quotes in place would make the IN () clause make look like this:
IN ( '<1st value>', '<2nd value>', '<3rd value>', ...)
instead of
IN (<1st value>, <2nd value>, <3rd value>, ...).
CREATE PROCEDURE "GET_RECORDS" (IN id_list VARCHAR(4000)
, OUT RECORDS tt_cusers)
LANGUAGE SQLSCRIPT
SQL SECURITY INVOKER
READS SQL DATA AS
BEGIN
declare _filter VARCHAR(4000);
_users = select * from cusers;
-- APPLY_FILTER expects a proper WHERE condition, so adding the column to filter
-- and the IN () expression is necessary.
--
-- the the id_list comes in with single quotes, let's remove those
_filter = 'USER_ID in (' || replace (:id_list, '''', '') ||')';
RECORDS = APPLY_FILTER(:_users, :_filter);
end;
call get_records (?, ?)
-- this 'list' is to be used as a single parameter value
-- '131072', '161223', '131074'
A slightly more comfortable approach for getting the data out from SAP HANA into R can be using a table typed user-defined function (UDF) instead. The main difference here is that the calling statement is a simple SELECT and the result is simply the resultset of this SELECT.
CREATE function "FGET_RECORDS" (IN id_list VARCHAR(4000))
returns tt_cusers
LANGUAGE SQLSCRIPT
SQL SECURITY INVOKER
READS SQL DATA AS
BEGIN
declare _filter VARCHAR(4000);
_users = select * from cusers;
-- APPLY_FILTER expects a proper WHERE condition, so adding the column to filter
-- and the IN () expression is necessary.
--
-- the the id_list comes in with single quotes, let's remove those
_filter = 'USER_ID in (' || replace (:id_list, '''', '') ||')';
_result = APPLY_FILTER(:_users, :_filter);
RETURN :_result;
end;
select * from fget_records (? );
In R (or in any other client) make sure to use bind variables when using this construct. Otherwise handling the different string quote-mechanisms can become cumbersome.
See the documentation on APPLY_FILTER here.
Use a User Defined Data Type.
First Create A User Defined Data Type
Database Node > Programmability > Types > User-Defined Table Types
Script :
CREATE TYPE dbo.MyTableType AS TABLE
(
ID INT
)
Create a Parameter in your procedure with the above type
CREATE PROCEDURE usp_InsertMessages
(
#MyParameter MyTableType READONLY
)
AS
BEGIN
INSERT INTO MyTable
(
id
)
SELECT
id
FROM #MyParameter
END
In a SQL Server database, one can use table variables like this:
declare #table as table (a int)
In an Azure Data Warehouse, that throws an error.
Parse error at line: 1, column: 19: Incorrect syntax near 'table'
In an Azure Data Warehouse, you can use temporary tables:
create table #table (a int)
but not inside functions.
Msg 2772, Level 16, State 1, Line 6 Cannot access temporary tables
from within a function.
This document from Microsoft says,
◦Must be declared in two steps (rather than inline): ◾CREATE TYPE
my_type AS TABLE ...; , then ◾DECLARE #mytablevariable my_type;.
But when I try this:
create type t as table (a int);
drop type t;
I get this :
Msg 103010, Level 16, State 1, Line 1 Parse error at line: 1, column:
8: Incorrect syntax near 'type'.
My objective is to have a function in an Azure Data Warehouse which uses a temporary table. Is it achievable?
Edit Start Here
Note that I am not looking for other ways to create one specific function. I have actually done that and moved on. I'm a veteran programmer but an Azure Data Warehouse rookie. I want to know if it's possible to incorporate some concept of temporary tables in an Azure Data Warehouse function.
Ok, I believe this is what you are after.
Firstly, this uses a Table Value Function, which are significantly faster than Scalar or Multi-statement Table value Functions.
Secondly, there was no use for a Table Variable, or Temporary Table, just some good odd string manipulation, a bit of maths, and a CTE. Definitely no expensive WHILE loop.
I've tested this against the examples in the link, and they all return the expected values.
USE Sandbox;
GO
CREATE FUNCTION ValidateHealthNumber (#HealthNumber varchar(10))
RETURNS TABLE
AS
RETURN
WITH Doubles AS(
SELECT CONVERT(tinyint,SUBSTRING(V.HN,O.P,1)) AS HNDigit,
CONVERT(tinyint,SUBSTRING(V.HN,O.P,1)) * CASE WHEN O.P % 2 = 0 THEN 1 ELSE 2 END ToAdd
FROM (VALUES(#HealthNumber)) V(HN)
CROSS APPLY (VALUES (1),(2),(3),(4),(5),(6),(7),(8),(9)) O(P)),
Parts AS (
SELECT CONVERT(tinyint,SUBSTRING(CONVERT(varchar(2),ToAdd),1,1)) AS FirstDigit, --We know that the highest value can be 18 (2*9)
CONVERT(tinyint,SUBSTRING(CONVERT(varchar(2),ToAdd),2,1)) AS SecondDigit --so no need for more than 2 digits.
FROM Doubles)
SELECT CASE RIGHT(#HealthNumber, 1) WHEN 10 - RIGHT(SUM(FirstDigit + SecondDigit),1) THEN 1 ELSE 0 END AS IsValid
FROM Parts;
GO
CREATE TABLE #Sample(HealthNumber varchar(10));
INSERT INTO #Sample
VALUES ('9876543217'), --Sample
('5322369835'), --Valid
('7089771195'), --Valid
('8108876957'), --Valid
('4395667779'), --Valid
('6983806917'), --Valid
('2790412845'), --not Valid
('5762696912'); --not Valid
SELECT *
FROM #Sample S
CROSS APPLY ValidateHealthNumber(HealthNumber) VHN;
GO
DROP TABLE #Sample
DROP FUNCTION ValidateHealthNumber;
If you don't understand any of this, please do ask.
No you can't. Object can't be created inside User Defined Functions (UDF). Use table variables instead.
If you want yo use user defined type, first create it outside the UDF and use it as a variable type within the UDF.
-- Create the data type
CREATE TYPE TestType AS TABLE
(
Id INT NOT NULL,
Col1 VARCHAR(20) NOT NULL)
GO
-- Create the tabled valued function
CREATE FUNCTION TestFunction
()
RETURNS
#Results TABLE
(Result1 INT, Result2 INT)
AS
BEGIN
-- Fill the table variable with the rows for your result set
DECLARE #Var1 TestType;
RETURN
END
GO
Scenario
I have a stored procedure written in T-Sql using SQL Server 2005.
"SEL_ValuesByAssetName"
It accepts a unique string "AssetName".
It returns a table of values.
Question
Instead of calling the stored procedure multiple times and having to make a database call everytime I do this, I want to create another stored procedure that accepts a list of all the "AssetNames", and calls the stored procedure "SEL_ValueByAssetName" for each assetname in the list, and then returns the ENTIRE TABLE OF VALUES.
Pseudo Code
foreach(value in #AllAssetsList)
{
#AssetName = value
SEL_ValueByAssetName(#AssetName)
UPDATE #TempTable
}
How would I go about doing this?
It will look quite crippled with using Stored Procedures. But can you use Table-Valued Functions instead?
In case of Table-Valued functions it would look something like:
SELECT al.Value AS AssetName, av.* FROM #AllAssetsList AS al
CROSS APPLY SEL_ValuesByAssetName(al.Value) AS av
Sample implementation:
First of all, we need to create a Table-Valued Parameter type:
CREATE TYPE [dbo].[tvpStringTable] AS TABLE(Value varchar(max) NOT NULL)
Then, we need a function to get a value of a specific asset:
CREATE FUNCTION [dbo].[tvfGetAssetValue]
(
#assetName varchar(max)
)
RETURNS TABLE
AS
RETURN
(
-- Add the SELECT statement with parameter references here
SELECT 0 AS AssetValue
UNION
SELECT 5 AS AssetValue
UNION
SELECT 7 AS AssetValue
)
Next, a function to return a list AssetName, AssetValue for assets list:
CREATE FUNCTION [dbo].[tvfGetAllAssets]
(
#assetsList tvpStringTable READONLY
)
RETURNS TABLE
AS
RETURN
(
-- Add the SELECT statement with parameter references here
SELECT al.Value AS AssetName, av.AssetValue FROM #assetsList al
CROSS APPLY tvfGetAssetValue(al.Value) AS av
)
Finally, we can test it:
DECLARE #names tvpStringTable
INSERT INTO #names VALUES ('name1'), ('name2'), ('name3')
SELECT * FROM [Test].[dbo].[tvfGetAllAssets] (#names)
In MSSQL 2000 I would make #allAssetsList a Varchar comma separated values list. (and keep in mind that maximum length is 8000)
I would create a temporary table in the memory, parse this string and insert into that table, then do a simple query with the condition where assetName in (select assetName from #tempTable)
I wrote about MSSQL 2000 because I am not sure whether MSSQL 2005 has some new data type like an array that can be passed as a literal to the SP.