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  • What are the rules governing how a bind variable can be used in Postgres and where is this defined?

    - by Craig Miles
    I can have a table and function defined as: CREATE TABLE mytable ( mycol integer ); INSERT INTO mytable VALUES (1); CREATE OR REPLACE FUNCTION myfunction (l_myvar integer) RETURNS mytable AS $$ DECLARE l_myrow mytable; BEGIN SELECT * INTO l_myrow FROM mytable WHERE mycol = l_myvar; RETURN l_myrow; END; $$ LANGUAGE plpgsql; In this case l_myvar acts as a bind variable for the value passed when I call: SELECT * FROM myfunction(1); and returns the row where mycol = 1 If I redefine the function as: CREATE OR REPLACE FUNCTION myfunction (l_myvar integer) RETURNS mytable AS $$ DECLARE l_myrow mytable; BEGIN SELECT * INTO l_myrow FROM mytable WHERE mycol IN (l_myvar); RETURN l_myrow; END; $$ LANGUAGE plpgsql; SELECT * FROM myfunction(1); still returns the row where mycol = 1 However, if I now change the function definition to allow me to pass an integer array and try to this array in the IN clause, I get an error: CREATE OR REPLACE FUNCTION myfunction (l_myvar integer[]) RETURNS mytable AS $$ DECLARE l_myrow mytable; BEGIN SELECT * INTO l_myrow FROM mytable WHERE mycol IN (array_to_string(l_myvar, ',')); RETURN l_myrow; END; $$ LANGUAGE plpgsql; Analysis reveals that although: SELECT array_to_string(ARRAY[1, 2], ','); returns 1,2 as expected SELECT * FROM myfunction(ARRAY[1, 2]); returns the error operator does not exist: integer = text at the line: WHERE mycol IN (array_to_string(l_myvar, ',')); If I execute: SELECT * FROM mytable WHERE mycol IN (1,2); I get the expected result. Given that array_to_string(l_myvar, ',') evaluates to 1,2 as shown, why arent these statements equivalent. From the error message it is something to do with datatypes, but doesnt the IN(variable) construct appear to be behaving differently from the = variable construct? What are the rules here? I know that I could build a statement to EXECUTE, treating everything as a string, to achieve what I want to do, so I am not looking for that as a solution. I do want to understand though what is going on in this example. Is there a modification to this approach to make it work, the particular example being to pass in an array of values to build a dynamic IN clause without resorting to EXECUTE? Thanks in advance Craig

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  • MySQL join problem

    - by snaken
    Whats wrong with this SQL? It should return results but returns nothing SELECT `pid` FROM `products` LEFT JOIN `prods_to_features` ON (`ptf_pid` = `pid`) WHERE (`ptf_id` = '66' OR `ptf_id` = '67') AND (`ptf_id` = '76') Is it not possible to have the 2nd where clause for the table that has been used in the left join?

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  • Is it possible to use CASE with IN?

    - by dkackman
    I'm trying to construct a T-SQL statement with a WHERE clause determined by an input parameter. Something like: SELECT * FROM table WHERE id IN CASE WHEN @param THEN (1,2,4,5,8) ELSE (9,7,3) END I've tried all combination of moving the IN, CASE etc around that I can think of. Is this (or something like it) possible?

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  • Sqlite3 and PDO problem with ORDER BY

    - by Maenny
    Hi, I try to use the SQL statement SELECT * FROM table ORDER BY column via an PDO-Object in PHP. Problem is, that I always get an error (Call to a member function fetchall() on a non-object - that means, the query did not return a PDO-object) when using the names of all columnname EXCEPT for ID. When I query SELECT * FROM table ORDER BY ID it works. ID is the PRIMARY INTEGER KEY, all other columns are TEXT or NUMERIC, neither of them would works with the ORDER BY clause. Any ideas?

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  • Does rails do a rollback if I use begin...rescue?

    - by codeman73
    I'd like to add a begin...rescue block to one of my controllers create method, in order to log better info and construct the correct error message to return to the client. Does the rescue in any way 'interrupt' the rollback process? I'm assuming rails automatically does a rollback. When does it happen? Has it already happened by the time I get in the rescue clause? I'm using mySQL on Dreamhost and I think they use innoDB.

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  • Escaping comma in java

    - by prasanna
    I have a string which is fed into the query as IN clause,which looks like this ('ACT','INACT') which is one of the parameters to a function inside a package.when a call is made to the function from java, it looks like this call package.function(1,2,3,('ACT','INACT'),4,5). When the package is called,i get error as wrong type of arguments. It is taking the values inside brackets as different values delimited by strings

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  • How to update a table using a select group by in a second one and itself as the data source in MySQL

    - by Jader Dias
    I can do this: SELECT t2.value + sum(t3.value) FROM tableA t2, tableB t3 WHERE t2.somekey = t3.somekey GROUP BY t3.somekey But how to do this? UPDATE tableA t1 SET speed = ( SELECT t2.value + sum(t3.value) FROM tableA t2, tableB t3 WHERE t2.somekey = t3.somekey AND t1.somekey = t3.somekey GROUP BY t3.somekey ) ; MySQL says it's illegal since you can't specify target table t1 for update in FROM clause.

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  • An Alternative to Views?

    - by Abs
    Hello all, I am just reading this article and I came across this: Filter: Remove any functions in the WHERE clause, don't include views in your Transact-SQL code, may need additional indexes. If I do not use views, what are the alternatives? I mean, in my situation, I want to select some data from a table and then use a few other select queries to work on the subset of data from the first select query? How can I do this efficiently? Thanks all

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  • Nhibernate schema clasue

    - by Phil Whittaker
    How do I use the schema clause on a bag object in Nhibernate mapping? I have an table that I need to sepcify the schema for and the nhibernate documentation talks about table schema but I can't find any further details...

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  • pgSQL query error

    - by running4surival
    i tried using this query: "SELECT * FROM guests WHERE event_id=".$id." GROUP BY member_id;" and I'm getting this error: ERROR: column "guests.id" must appear in the GROUP BY clause or be used in an aggregate function can anyone explain how i can work around this?

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  • SQL Query takes about 10 - 20 minutes

    - by masfenix
    I have a select from (nothing to complex) Select * from VIEW This view has about 6000 records and about 40 columns. It comes from a Lotus Notes SQL database. So my ODBC drive is the LotusNotesSQL driver. The query takes about 30 seconds to execute. The company I worked for used EXCEL to run the query and write everything to the worksheet. Since I am assuming it writes everything cell by cell, it used to take up to 30 - 40 minutes to complete. I then used MS access. I made a replica local table on Access to store the data. My first try was INSERT INTO COLUMNS OF LOCAL TABLE FROM (SELECT * FROM VIEW) note that this is pseudocode. This ran successfully, but again took up to 20 - 30 minutes. Then I used VBA to loop through the data and insert it in manually (using an INSERT statement) for each seperate record. This took about 10 - 15 minutes. This has been my best case yet. What i need to do after: After i have the data, I need to filter through it by department. The thing is if I put a where clause in the SQL query (the time jumps from 30 seconds to execute the query, to about 10 minutes + the time to write to local table/excel). I dont know why. MAYBE because the columns are all text columns? If we change some of the columns to integer, would that make it faster in terms of the where clause? I am looking for suggestions on how to approach this. My boss has said we could employ some Java based solution. Will this help? I am not a java person but a c#, and maybe I'll convince them to use c# as well, but i am mainly looking for suggestions on how to cut down the time. I've already cut it down from 40 minutes to 10 minutes, but the want it under 2 minutes. Just to recap: Query takes about 30 seconds to exceute Query takes about 15 - 40 minutes to be used locally in excel/acess Need it under 2 minutes Could use java based solution You may suggest other solutions instead of java.

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  • SQL Server 2005:charindex starting from the end

    - by Shuo
    Hey,everyone I have a string 'some.file.name',I want to grab 'some.file'. To do that,I need to find the last occurrence of '.' in a string. My solution is : declare @someStr varchar(20) declare @reversedStr varchar(20) declare @index int set @someStr = '001.002.003' set @reversedStr = reverse(@someStr) set @index = len(@someStr) - charindex('.',@reversedStr) select left(@someStr,@index) Well,isn't it too complicated?I was just intented to using 'some.file' in a where-clause. Anyone has a good idea?

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  • Why isn't this simple MySQL statement working?

    - by Clark
    I am trying to match a user inputted search term against two tables: posts and galleries. The problem is the union all clause isn't working. Is there something wrong with my code? $query = mysql_query(" SELECT * FROM posts WHERE title LIKE '%$searchTerm%' OR author LIKE '%$searchTerm%' OR location LIKE '%$searchTerm%' OR excerpt LIKE '%$searchTerm%' OR content LIKE '%$searchTerm%' UNION ALL SELECT * FROM galleries WHERE title LIKE '%$searchTerm%' ");

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  • Cannot .Count() on IQueryable (NHibernate)

    - by Bruno Reis
    Hello, I'm with an irritating problem. It might be something stupid, but I couldn't find out. I'm using Linq to NHibernate, and I would like to count how many items are there in a repository. Here is a very simplified definition of my repository, with the code that matters: public class Repository { private ISession session; /* ... */ public virtual IQueryable<Product> GetAll() { return session.Linq<Product>(); } } All the relevant code in the end of the question. Then, to count the items on my repository, I do something like: var total = productRepository.GetAll().Count(); The problem is that total is 0. Always. However there are items in the repository. Furthermore, I can .Get(id) any of them. My NHibernate log shows that the following query was executed: SELECT count(*) as y0_ FROM [Product] this_ WHERE not (1=1) That must be that "WHERE not (1=1)" clause the cause of this problem. What can I do to be able .Count() the items in my repository? Thanks! EDIT: Actually the repository.GetAll() code is a little bit different... and that might change something! It is actually a generic repository for Entities. Some of the entities implement also the ILogicalDeletable interface (it contains a single bool property "IsDeleted"). Just before the "return" inside the GetAll() method I check if if the Entity I'm querying implements ILogicalDeletable. public interface IRepository<TEntity, TId> where TEntity : Entity<TEntity, TId> { IQueryable<TEntity> GetAll(); ... } public abstract class Repository<TEntity, TId> : IRepository<TEntity, TId> where TEntity : Entity<TEntity, TId> { public virtual IQueryable<TEntity> GetAll() { if (typeof (ILogicalDeletable).IsAssignableFrom(typeof (TEntity))) { return session.Linq<TEntity>() .Where(x => (x as ILogicalDeletable).IsDeleted == false); } else { return session.Linq<TEntity>(); } } } public interface ILogicalDeletable { bool IsDeleted {get; set;} } public Product : Entity<Product, int>, ILogicalDeletable { ... } public IProductRepository : IRepository<Product, int> {} public ProductRepository : Repository<Product, int>, IProductRepository {} Edit 2: actually the .GetAll() is always returning an empty result-set for entities that implement the ILogicalDeletable interface (ie, it ALWAYS add a WHERE NOT (1=1) clause. I think Linq to NHibernate does not like the typecast.

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  • Warning produced by f#: value has been copied to ensure the original is not mutated

    - by user1878761
    The first definition below produces the warning in the title when compiled with f# 3.0 and the warning level set to 5. The second definition compiles cleanly. I wondered if someone could please explain just what the compiler worries I might accidentally mutate, or how would splitting the expression with a let clause help avoid that. Many thanks. let ticks_with_warning () : int64 = System.DateTime.Now.Ticks let ticks_clean () : int64 = let t = System.DateTime.Now t.Ticks

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  • How can this SQL be wrong? What am I not seeing?

    - by ropstah
    Can anybody please spot my error, this should be a legal query in SQL shouldn't it?? Unknown column u.usr_auto_key in the ON clause This is the database schema: User: (usr_auto_key, name, etc...) Setting: (set_auto_key, name etc..) User_Setting: (usr_auto_key, set_auto_key, value) And this is the query... SELECT `u`.`usr_auto_key` AS `u__usr_auto_key`, `s`.`set_auto_key` AS `s__set_auto_key`, `u2`.`usr_auto_key` AS `u2__usr_auto_key`, `u2`.`set_auto_key` AS `u2__set_auto_key`, `u2`.`value` AS `u2__value` FROM `User` `u`, `Setting` `s` LEFT JOIN `User_Setting` `u2` ON `u`.`usr_auto_key` = `u2`.`usr_auto_key` WHERE (`s`.`sct_auto_key` = 1 AND `u`.`usr_auto_key` = 1 AND admin_property is null)

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  • Assign a list of integers to an @var

    - by justSteve
    I can: declare @idOrder int set @idOrder = 21319 I want: declare @idOrder int set @idOrder = (21319, 21320) for use in a series of statements where the 'WHERE' clause uses the IN operator delete Orders where idOrder in @idOrder instead of delete Orders where idOrder in (21319, 21320)

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  • Rules regarding iPhone apps

    - by iphone newbie
    iphone dev has this rule for iphone developers Be certain that the items you offer for purchase do not contain, or relate to, pornography, hate speech, defamation, or gambling (simulated gambling is acceptable). But how come there are apps in the app store such as iBetMate, which, in fact, allows users to gamble? Is there a clause or something that I missed in Apple's rules?

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  • When would isSearchable return false for an Oracle JDBC column?

    - by Ian Varley
    In what cases would a call to java.sql.ResultSetMetaData.isSearchable(int col) return false for an Oracle database? The documentation for the method doesn't really answer the question: "Indicates whether the designated column can be used in a where clause." I can think of only one case - when the column is the result of an aggregate function (in which case it would have to be part of a HAVING filter, not a WHERE filter). Are there any other cases?

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