A function performs some specified work, usually taking parameters as input. In terms of databases these may be specific to SQL or to the database vendor.

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1answer
5k views

SQL injection in Postgres functions vs prepared queries

In Postgres, are prepared queries and user defined functions equivalent as a mechanism for guarding against SQL injection? Are there particular advantages in one approach over the other?
11
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1answer
14k views

How to use aes-encryption in PostgreSQL?

I tried aes-encryption by using following statement: SELECT encrypt('test', 'key', 'aes'); which worked, but I am not able to decrypt the value. I inserted it in a field of datatype bytea but I'm ...
3
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3answers
5k views

How do I create a user-defined aggregate function?

I need an aggregate function that MySQL doesn't provide. I would like it to be in MySQL's flavor of SQL (that is, not in C). How do I do this? What I'm stuck on is creating an aggregate function -- ...
2
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2answers
8k views

Insert values from a record variable into a table

I am developing a user-defined function that takes two arguments: create or replace function gesio( events_table_in regclass, events_table_out regclass) returns void as $$ ... $$ ...
1
vote
2answers
639 views

Assign to NEW by key in a Postgres trigger

In the trigger body, how can I assign a value to NEW by it's field name? That's what I want to do: some_key = "some_column"; NEW[some_key] = 5;
5
votes
1answer
221 views

How to better use CLR Function from performance point of view (repeat inside each DB or have general function)?

I asked a question about validation of XML using XSD schema inside SQL Server 2012 (see link). I understand (as I suspected) that I need to use CLR Function. The function will get XSD schema text and ...
3
votes
3answers
177 views

PostgreSQL trigger function that selects from %current% table

I have multiple tables that have the same column names, they only vary in their column values, like: tbl_log_a tbl_log_b tbl_log_c ... 26 tables from a to z. Each table has a trigger that calls a ...
2
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1answer
5k views

How to join a table with a table valued function?

I have a user defined function: create function ut_FooFunc(@fooID bigint, @anotherParam tinyint) returns @tbl Table (Field1 int, Field2 varchar(100)) as begin -- blah blah end Now I want to join ...
2
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1answer
4k views

How to pass a parameter into a function

At the moment I have a view created, see it here in the answer. How can I create a function based on that crosstab() query , so I can pass a date, and get data for the specific date? Also is it good ...
34
votes
2answers
25k views

Create index if it does not exist

I am working on a function that allows me to add an index if it does not exist. I am running into the problem that I cannot get a list of indexes to compare to. Any thoughts? This is a similar issue ...
14
votes
2answers
24k views

Is commit necessary after DML operation in Function/Procedure?

I wonder to know if it is necessary to write commit after insert/delete/update in function/procedure? Example: create or replace function test_fun return number is begin delete from a; return ...
19
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9answers
4k views

Test if a string is a palindrome using T-SQL

I am a beginner in T-SQL. I want to decide whether an input string is a palindrome, with output = 0 if it is not and output = 1 if it is. I am still figuring out the syntax. I am not even getting an ...
8
votes
3answers
856 views

Create function in central database or repeat in each database?

One of my developers has written a SQL function that works like the VB.Net function (LastIndexOf) and wants to publish it. My question is what would be the reason to put this in a central database ...
4
votes
3answers
8k views

how to create backup for stored procedure,trigger and functions of a database in sql server 2008?

I'm having 2 databases in 2 different servers(.246 and .252). I need to create backup for all stored procedures, triggers and function from 252 server and restore it in 246 server.database name in ...
4
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1answer
1k views

Running functions in parallel

This is for SQL Server 2012. We have some import processes for FTP files that are picked up and read into a staging table, from there we massage/check the data before moving into production. One of ...
4
votes
2answers
2k views

Add function parameter to SQL query WHERE clause

I have a web application in java and it uses a query. I don't want to write the query into Java, so I made a function: CREATE OR REPLACE FUNCTION testFunc(inputs text) RETURNS TABLE(...) AS $$ ...
4
votes
1answer
867 views

Getting error “must declare the scalar variable” in SQL function even though it is declared

I am altering function like: ALTER FUNCTION [dbo].[fn_CalculateListing](@Listing TypeListingDatePrice READONLY) RETURNS TypePreviousListingResult AS BEGIN DECLARE @tbl_ListingDateDetails ...
4
votes
1answer
15k views

Invalid use of a side-effecting operator 'INSERT' within a function - Multiple Inserts in Function

If this is not the right forum please let me know and move it for me. I've just got a bunch of inserts like this toward the end of my scalar function: INSERT INTO [Raptor].[dbo].[UserRole] ...
2
votes
2answers
328 views

Call UPSERT function multiple times to different inputs

I have a function: merge_vehicles(vid, cid, vname, reg_no, name, name_1st) Can i call it multiple times on inputs like (2335, 55, '246BDH', '246BDH', '811', 1), (2336, 55, '038THX', '038THX', '831'...
1
vote
1answer
255 views

Implement a Parent-Level Count in Binary Search Tree

Based on this question, have any way to implement a parent level count? Find highest level of a hierarchical field: with vs without CTEs Example table: +----+-----------+ | id | parent_id | +----+-...
5
votes
4answers
198 views

Implicit conversion warning despite persisted computed column vs. performance hit from UDF in persisted computed column definition

I have a need for a computed column to resolve an implicit conversion problem. I have a column that is declared as a VARCHAR that should only ever store integers, but is occasionally populated in ...
4
votes
1answer
155 views

Validate XML using XSD inside TSQL function in SQL Server 2012?

I need to validate XML using XSD inside TSQL. To make this task semi automated I need to do this inside TSQL function. To make validation I have to set value to XML and if it is not valid I will ...
4
votes
1answer
204 views

PL/pgSQL issues when function used twice (caching problem ?)

I am facing an absolutely weird problem that feels much like a Postgres bug than an algorithm problem. I have this function: CREATE FUNCTION sp_connect(mail character varying, passwd character ...
3
votes
1answer
211 views

How to create function(table_name) that returns a set of the table

I have a set of tables that share the same fields (some timestamps and users names used for version control). I need to create a function with dynamic sql that uses a table_name and a timestamp as ...
3
votes
1answer
1k views

'ERROR: text search dictionary “unaccent” does not exist' during CREATE INDEX?

I'm running PostgreSQL 9.3 on Mac OS X Yosemite. I try to create an unaccent lowercase trigram index. To achieve it I did this: mydb=# CREATE EXTENSION pg_trgm SCHEMA public VERSION "1.1"; ...
2
votes
1answer
186 views

How to apply a regex on a column fetched from DB

I am using IBM DB2. So, I am retrieving a column named SSN from a table. I have to apply the following regex on that column: ([1-57-8][0-9]{2} |0([1-9][0-9] |[0-9][1-9]) |6([0-57-9][0-9] |[0-9][0-57-...
1
vote
1answer
405 views

Function quote_nullable(timestamp without time zone) is not unique

When I run this query on "enterprisedb 9.2", it raises an error: select quote_nullable(to_date('09-02-2014 ','dd-MM-yyyy'))::date; Error: LINE 1: select quote_nullable(to_date('09-02-2014 ','dd-...
0
votes
1answer
59 views

When to use stored procedure / UDF? [closed]

I'm confused about usage of SP / UDF. Typically, it is also possible to write code in programs outside of database. So is there any general advice to decide when to use them?