If I have a TABLE named MyTable which has columns say C1(type date) and C2 (type character) I want to create a stored function that takes an input and the input should always belong to C1, and the output of the stored function should be the corresponding element in C2. I have tried to do it using the 'select' statement followed by 'where' clause inside the stored function but was not able to achieve it. Is there any other way to accomplish this task.
DELIMITER $$
CREATE FUNCTION `MyFunction`
(`Date` datetime)
RETURNS char(10)
BEGIN
DECLARE MyVariable char(10)
SELECT MyVariable = `C2`
FROM MyTable
WHERE `Date` = `C1`; RETURN MyVariable;
END$$
DELIMITER ;
But this keeps giving me ERROR CODE: 1064
At first glance, I see a syntax error:
...
BEGIN
DECLARE MyVariable char(10) <-- needs a semicolon here
SELECT MyVariable = `C2`
...
Every statement within the body of your routine must end with a semicolon. See examples of DECLARE in this manual page: https://dev.mysql.com/doc/refman/8.0/en/local-variable-scope.html
It should be like this:
...
BEGIN
DECLARE MyVariable char(10);
SELECT MyVariable = `C2`
...
Re your comment:
Error 1415 means "cannot return a result set". Your stored function is doing a SELECT without putting the result into your declared local variable using an INTO keyword.
You appear to be trying to set the value of MyVariable using = but that's just making a comparison. It doesn't assign anything to MyVariable.
Without using INTO to assign the variable, your SELECT statement is by default returning a result set. This is allowed in a stored procedure, but not in a stored function. A stored function must return a single scalar value, not a result set.
...
BEGIN
DECLARE MyVariable char(10);
SELECT `C2` INTO MyVariable
FROM MyTable
WHERE `Date` = `C1`;
RETURN MyVariable;
END
P.S.: I edited your question to replace the term "user-defined function" with "stored function". These are two different things in MySQL. You are writing a stored function.
In MySQL, they use the term user-defined function (UDF) for a function you implement in C/C++ code and compile into the MySQL server. It's less common for developers to write this type of extension.
DELIMITER //
CREATE PROC InserimentoValori()
BEGIN
DECLARE #caratteri varchar(30);
set #caratteri = 'abcdefghijklmnopqrstuvwxyz',
DECLARE x INT DEFAULT 1;
WHILE x <=100 DO
INSERT INTO Persona(nome,cognome,eta) VALUES((SELECT #caratteri = substring(#caratteri +1),(SELECT #caratteri = sebstring(#caratteri +1),(SELECT floor(rand() * 99) AS randNum));
SET x = x+1;
END WHILE
END //
DELIMITER ;
I want to create a stored procedure that insert random values into the table.
Thanks
There are a couple of errors.
We don't "declare" user defined variables in MySQL. Just SET them.
If you want to DECLARE a variable within a procedure, that needs to be a procedure variable.
A user defined variable has a name that starts with the # character. A procedure variable cannot start with a # character.
So, a line like this is an error:
DECLARE #foo ...
If you want to use a user defined variable, remove that line. If you want to use a procedure variable, remove the # from the beginning of the variable name (and make that same change everywhere you want to reference the procedure variable foo.)
And SEBSTRING is not the name of a MySQL provided function.
Also, a boolean expression in a SELECT list of a query will return 0, 1 or NULL.
For example:
SELECT #caratteri = substring(#caratteri +1)
That expression is comparing the value on the left side of the = with the value on the right, and is going to return 1 if they are equal, or 0 if the aren't, or NULL if either of the values is NULL.
To perform an assignment to a user defined variable in a SELECT statement, use the Pascal-style := operator.
(If you meant to do an assignment, the design makes it look like you are gogin to lop off the first character each time through the loop; that's eventually going to be an empty string, if we loop enough times. You may want to think about leaving the string static. Consider incrementing integer values, and use those as arguments in SUBSTRING function. And you can use the MOD operator to get the integer value to "wrap".)
This question already has answers here:
How to convert postgres json to integer
(3 answers)
Closed 8 months ago.
I need to somehow cast from json to int. I have made this func.:
CREATE OR REPLACE FUNCTION json2int(p_json json)
RETURNS integer AS
$BODY$DECLARE
v_json json;
--v_char character varying;
v_int integer;
BEGIN
SELECT p_json->'additionalData'->'id' INTO v_json;
--SELECT CAST(v_json as character varying) INTO v_char;
SELECT CAST(v_json as integer) INTO v_int;
RETURN v_int;
END;$BODY$
LANGUAGE plpgsql VOLATILE
COST 100;
ALTER FUNCTION json2int(json)
OWNER TO postgres;
I tried casting from json to int, that did't work. Then I tried casting from json to character varying to int, that also did't work. So I added:
CREATE CAST (json AS integer) WITH INOUT as implicit;
And now when I run my function as:
SELECT json2int('{"additionalData":{"id":"4","userType":"viewer"},"type":"wall"}');
I get this error:
ERROR: invalid input syntax for integer: ""4""
CONTEXT: SQL statement "SELECT CAST(v_json as integer)"
PL/pgSQL function json2int(json) line 8 at SQL statement
Can somebody help with this?
As hinted in the comments use ->> to have text then cast to int:
SELECT (p_json -> 'additionalData' ->> 'id')::int INTO v_int;
This question already has answers here:
Closed 10 years ago.
Possible Duplicate:
SQL: Select dynamic column name based on variable
I have the following simple select statement:
DECLARE #value varchar(10)
SET #value = 'intStep'
SELECT #value FROM dbo.tblBatchDetail
I have tried
SELECT CAST(#value AS varchar(10)) FROM dbo.tblBatchDetail
and all I get a list of intstep
QUESTION: can I pass variable as column name to this statement? Or what is the best way of doing this
I'm using SQL Server 2008 (9.0 RTM)
This will be a stored procedure
Thanks in advance
You can't use variable names to bind columns or other system objects, you need dynamic sql
DECLARE #value varchar(10)
SET #value = 'intStep'
DECLARE #sqlText nvarchar(1000);
SET #sqlText = N'SELECT ' + #value + ' FROM dbo.tblBatchDetail'
Exec (#sqlText)
I am working on a SSRS report that uses a stored procedure containing a few parameters. I am having problems with two of the parameters because I want to have the option of selecting more than one item.
Here's a condensed version of what I have:
CREATE PROCEDURE [dbo].[uspMyStoredProcedure]
(#ReportProductSalesGroupID AS VARCHAR(MAX)
,#ReportProductFamilyID AS VARCHAR(MAX)
,#ReportStartDate AS DATETIME
,#ReportEndDate AS DATETIME)
--THE REST OF MY QUERY HERE WHICH PULLS ALL OF THE NEEDED COLUMNS
WHERE DateInvoicedID BETWEEN #ReportStartDate AND #ReportEndDate
AND ProductSalesGroupID IN (#ReportProductSalesGroupID)
AND ProductFamilyID IN (#ReportProductFamilyID)
When I try to just run the stored procedure I only return values if I enter only 1 value for #ReportProductSalesGroupID and 1 value #ReportProductFamilyID. If I try to enter two SalesGroupID and/or 2 ProductFamilyID it doesn't error, but I return nothing.
-- Returns data
EXEC uspMyStoredProcedure 'G23', 'NOF', '7/1/2009', '7/31/2009'
-- Doesn't return data
EXEC uspMyStoredProcedure 'G23,G22', 'NOF,ALT', '7/1/2009', '7/31/2009'
In SSRS I get an error that says:
Incorrect syntax near ','
It appears that the , separator is being included in the string instead of a delimiter
You need three things:
In the SSRS dataset properties, pass the multi-value param to the stored procedure as a comma-delimited string
=Join(Parameters!TerritoryMulti.Value, ",")
In Sql Server, you need a table-value function that can split a comma-delimited string back out into a mini table (eg see here). edit: Since SQL Server 2016 you can use the built-in function STRING_SPLIT for this
In the stored procedure, have a where clause something like this:
WHERE sometable.TerritoryID in (select Item from dbo.ufnSplit(#TerritoryMulti,','))
... where ufnSplit is your splitting function from step 2.
(Full steps and code in my blog post 'SSRS multi-value parameters with less fail'):
Let us assume that you have a multi value list #param1
Create another Internal Parameter on your SSRS report called #param2 and set the default value to:
=Join(Parameters!param1.value, 'XXX')
XXX can be any delimiter that you want, EXCEPT a comma (see below)
Then, you can pass #param2 to your query or stored procedure.
If you try to do it any other way, it will cause any string function that uses commas to separate arguments, to fail. (e.g. CHARINDEX, REPLACE).
For example Replace(#param2, ',', 'replacement') will not work. You will end up with errors like "Replace function requires 3 arguments".
Finally I was able to get a simple solution for this problem. Below I have provided all (3) steps that I followed.
I hope you guys will like it :)
Step 1 - I have created a Global Temp Table with one column.
CREATE GLOBAL TEMPORARY TABLE TEMP_PARAM_TABLE(
COL_NAME VARCHAR2(255 BYTE)
) ON COMMIT PRESERVE ROWS NOCACHE;
Step 2 - In the split Procedure, I didn't use any array or datatable, I have directly loaded the split values into my global temp table.
CREATE OR REPLACE PROCEDURE split_param(p_string IN VARCHAR2 ,p_separator IN VARCHAR2
)
IS
v_string VARCHAR2(4000);
v_initial_pos NUMBER(9) := 1;
v_position NUMBER(9) := 1;
BEGIN
v_string := p_string || p_separator;
delete from temp_param_policy;
LOOP
v_position :=
INSTR(v_string, p_separator, v_initial_pos, 1);
EXIT WHEN(NVL(v_position, 0) = 0);
INSERT INTO temp_param_table
VALUES (SUBSTR(v_string, v_initial_pos
, v_position - v_initial_pos));
v_initial_pos := v_position + 1;
END LOOP;
commit;
END split_param;
/
Step 3 - In the SSRS dataset parameters, I have used
=Join(Parameters!A_COUNTRY.Value, ",")
Step 4: In the start of your stored procedure executes the Procedure
Exec split_param(A_Country, ‘,’);
Step 5: In your stored procedure sql use the condition like below.
Where country_name in (select * from TEMP_PARAM_TABLE)
When SSRS passes the parameter it is in the form: Param1,Param2,Param3.
In the procedure, you just need to put identifiers around each parameter. And also identifiers around the value that is returned by the dataset. In my case, I used semicolons.
CREATE OR REPLACE PROCEDURE user.parameter_name (
i_multivalue_parameter
)
AS
l_multivalue_parameter varchar2(25555) := ';' || replace(i_multivalue_parameter,',',';') || ';';
BEGIN
select something
from dual
where (
instr(l_multivalue_parameter, ';' || database_value_that_is_singular || ';') > 0
)
END;
i_multivalue_parameter is passed in via SSRS.
l_multivalue_parameter reads the parameter passed in via SSRS and puts identifiers around each value.
database_value_that_is_singular is the value returned for each record.
So if 'Type1,Type2,Type3'is passed in via SSRS:
i_multivalue_parameter is: Type1,Type2,Type3
l_multivalue_parameter is: ;Type1;Type2;Type3;
database_value_that_is_singular is: ;Type1; or ;Type2; or ;Type3;
Instr will return a value over 0 if the parameter matches.
This works even if each parameters are similar. EG: "Type A" and "Type AA". That is "Type A" will not match "Type AA".
I found a simple way for my solution. Define the parameter value in the report as an expression like this
="'" + Join(Parameters!parm.Value,"','") + "'"
(in case you can't read it the first and last literals are double quote, single quote, double quote. The join literal is double quote, single quote, comma, single quote, double quote)
Then in the stored procedure you can use dynamic sql to create your statement. I did this to create a temp table of values to join to in a later query, like this:
CREATE #nametable (name nvarchar(64))
SET #sql = N'SELECT Name from realtable where name in (' + #namelist + ')'
INSERT INTO #nametable exec sp_executesql #sql
#namelist would be the name of the stored procedure parameter.