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• Cost of exception handlers in Python

  - by Thilo

  In another question, the accepted answer suggested replacing a (very cheap) if statement in Python code with a try/except block to improve performance. Coding style issues aside, and assuming that the exception is never triggered, how much difference does it make (performance-wise) to have an exception handler, versus not having one, versus having a compare-to-zero if-statement?

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• Why is using OPENQUERY on a local server bad?

  - by Ziplin

  I'm writing a script that is supposed to run around a bunch of servers and select a bunch of data out of them, including the local server. The SQL needed to SELECT the data I need is pretty complicated, so I'm writing sort of an ad-hoc view, and using an OPENQUERY statement to get the data, so ultimately I end up looping over a statement like this: exec('INSERT INTO tabl SELECT * FROM OPENQUERY(@Server, @AdHocView)') However, I've heard that using OPENQUERY on the local server is frowned upon. Could someone elaborate as to why?

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• OCaml: Matching with any negative

  - by nicotine

  Is there a way to get pattern matching to match my value with any negative number? It does not matter what the negative number is I just need to match with any negative. I have accomplished what I want with this simple code: let y = if(n < 0) then 0 else n in match y with 0 -> [] | _ -> [x] @ clone x (n - 1) But I want to eliminate that if statement and just get it to check it as another case in the match statement

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• parse results in MySQL via REGEX

  - by Derek Adair

  Hi, I'm a bit confused on the functionality of the REGEX support for MySQL and I have yet to find a solid example on how to separate a result with REGEX within an sql statement. Example: How could I pull data from a table emails that looks something like... +-------------------------+ |Emails | |-------------------------| |[email protected]| +-------------------------+ and return something through an sql statement that looks like... +------------------------------+ |Username | Domain | TLD | |-----------|------------|-----| |some.email | yourdomain | com | +------------------------------+

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• primitives of a programming language

  - by Tim

  Hi, Which do the concepts control flow, data type, statement, expression and operation belong to? Syntax or semantics? What is the relation between control flow, data type, statement, expression, operation, function, ...? How a program is built from these primitives level by level? I would like to understand these primitive concepts and their relations in order to figure out what aspects of a new language should one learn. Thanks and regards!

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• Need to replace HTML single-quote entity in MySQL

  - by modulaaron

  Hi, I currently have the following MySQL statement to replace the HTML entity for a single quote with an actual single quote: update photo_galleries replace(title, '&#39;', '\''); This statement returns an error. I have tried adding additional backslashes, but this does not help at all. I want to run this command using pure SQL (no PHP, etc.). Any suggestions are welcome and appreciated. Thanks.

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• I get an error when implementing tde in SQL Server 2008

  - by mahima

  While using USE mssqltips_tde; CREATE DATABASE ENCRYPTION KEY with ALGORITHM = AES_256 ENCRYPTION BY SERVER CERTIFICATE TDECert GO I'm getting an error Msg 156, Level 15, State 1, Line 2 Incorrect syntax near the keyword 'KEY'. Msg 319, Level 15, State 1, Line 3 Incorrect syntax near the keyword 'with'. If this statement is a common table expression or an xmlnamespaces clause, the previous statement must be terminated with a semicolon. please help in resolving the same as i need to implement Encryption on my DB

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• How to get parameter values for dm_exec_sql_text

  - by Ted Elliott

  I'm running the following statement to see what queries are executing in sql server: select * from sys.dm_exec_requests r cross apply sys.dm_exec_sql_text(r.sql_handle) where r.database_id = DB_ID('<dbname>') The sql text that comes back is parameterized: (@Parm0 int) select * from foo where foo_id = @Parm0 Is there any way to get the values for the parameters that the statement is using? Say by joining to another table perhaps?

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• System.Data.Common.DbDataReader

  - by Craig Johnston

  If I use this class to do a SELECT * FROM ... statement against a database, what method or variable of this class should I use just to give me a dump of the output from the SQL statement?

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• When do you put double semicolons in F#?

  - by rsteckly

  Hi, This is a stupid question. I've been reading a couple books on F# and can't find anything that explains when you put ;; after a statement, nor can I find a pattern in the reading. When do you end a statement with double semi-colons?

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• if-else equivalent via linq-to-sql query in where clause c#

  - by Darcy

  Hi guys, Basically I wanted to have an if-else statement in my linq to sql statement. var query = from d in database if(x == y) { where d.Attr = x } else { where d.Attr = y } select d; Any ideas?

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• Unintentional concatenation in Bison/Yacc grammar.

  - by troutwine

  I am experimenting with lex and yacc and have run into a strange issue, but I think it would be best to show you my code before detailing the issue. This is my lexer: %{ #include <stdlib.h> #include <string.h> #include "y.tab.h" void yyerror(char *); %} %% [a-zA-Z]+ { yylval.strV = yytext; return ID; } [0-9]+ { yylval.intV = atoi(yytext); return INTEGER; } [\n] { return *yytext; } [ \t] ; . yyerror("invalid character"); %% int yywrap(void) { return 1; } This is my parser: %{ #include <stdio.h> int yydebug=1; void prompt(); void yyerror(char *); int yylex(void); %} %union { int intV; char *strV; } %token INTEGER ID %% program: program statement EOF { prompt(); } | program EOF { prompt(); } | { prompt(); } ; args: /* empty */ | args ID { printf(":%s ", $<strV>2); } ; statement: ID args { printf("%s", $<strV>1); } | INTEGER { printf("%d", $<intV>1); } ; EOF: '\n' %% void yyerror(char *s) { fprintf(stderr, "%s\n", s); } void prompt() { printf("> "); } int main(void) { yyparse(); return 0; } A very simple language, consisting of no more than strings and integer and a basic REPL. Now, you'll note in the parser that args are output with a leading colon, the intention being that, when combined with the first pattern of the rule of the statement the interaction with the REPL would look something like this: > aaa aa a :aa :a aaa> However, the interaction is this: > aaa aa a :aa :a aaa aa aa > Why does the token ID in the following rule statement: ID args { printf("%s", $<strV>1); } | INTEGER { printf("%d", $<intV>1); } ; have the semantic value of the total input string, newline included? How can my grammar be reworked so that the interaction I intended?

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• how to split a string by another string ?

  - by Nikhil Vaghela

  I have a string in following format "TestString 1 <^ TestString 2 <^ Test String3 Which i want to split by "<^" string. Using following statement it gives the output i want "TestString 1 <^> TestString 2 <^> Test String3" .Split("<^>".ToCharArray(), StringSplitOptions.RemoveEmptyEntries) But if my string contains "<" , "" or "^" anywhere in the text then above split statement will consider that as well Any idea how to split only for "<^" string ?

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• C# Eval() support

  - by Adi Barda

  Hi Guys, we need to evaluate a value in an object in run time while we have a textual statement of the exact member path for example: myobject.firstMember.secondMember[3].text we thought of parsing this textual statement using regex and then evaluate the text value by using reflection but before we do that i wonder if C# support some kind of eval ability? so we won't have to do the parsing ourself. How do microsoft do this in their immediate window or watch windows? thanks you very much, Adi Barda

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• Oracle Database Enforce CHECK on multiple tables

  - by GigaPr

  I am trying to enforce a CHECK Constraint in a ORACLE Database on multiple tables CREATE TABLE RollingStocks ( Id NUMBER, Name Varchar2(80) NOT NULL, RollingStockCategoryId NUMBER NOT NULL, CONSTRAINT Pk_RollingStocks Primary Key (Id), CONSTRAINT Check_RollingStocks_CategoryId CHECK ((RollingStockCategoryId IN (SELECT Id FROM FreightWagonTypes)) OR (RollingStockCategoryId IN (SELECT Id FROM LocomotiveClasses))) ); ...but i get the following error: *Cause: Subquery is not allowed here in the statement. *Action: Remove the subquery from the statement. Can you help me understanding what is the problem or how to achieve the same result?

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• C++ random number from a set

  - by user69514

  Is it possible to print a random number in C++ from a set of numbers with ONE SINGLE statement? let's say the set is 2, 5, 22, 55, 332 i looked up rand, but I double it's possible to do in a single statement

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• Conditional statements bug in Google Chrome

  - by Pedro Reis

  When I use a conditional statement targeting IE6 and below with some PHP code Google Chrome disregards the statement and inserts the code. Example: It will insert the content of ie6.php in the body anyway. Anybody got this problem before?

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• Linq to SQL - Error handling

  - by Sundararajan S

  I have a linq to sql statement that inserts records in the database. If there is a duplicate, it throws Primary key violation . after this happens, whenever i try to execute any other statement, it repeatedly shows this error. Is this a problem of transaction not getting closed. Also how to handle transactions in a more reliable way in LINQ to SQL

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• Using FlashVars to pass variables to a SWF

  - by SoeTheingiLin

  I would like to pass over 50 items of variables from php to flash. Actually I want to pass array with foreach statement, looping through the array and assigning loop index to the variables and flash again accept the php values through looping. Is this possible? If passing values through foreach or loop statement is impossible, I would like to break a new line in tag. how can I break a new line in FlashVars tag?

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• How can you reverse traversal through a c# collection?

  - by Sam F

  Is it possible to have a foreach statement that will traverse through a Collections object in reverse order? If not a foreach statement is there any other way? Thanks.

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• RDF-raptor-parser

  - by naveen

  Hi All, I am trying to parse the rdf file but I am getting error while executing following code in ubuntu RDF::Reader.open("http://datagraph.org/jhacker/foaf.rdf") do |reader| reader.each_statement do |statement| puts statement.inspect end end as LoadError: Could not open library 'libraptor': libraptor: cannot open shared object file: No such file or directory. Could not open library 'libraptor.so': libraptor.so: cannot open shared object file: No such file or directory I installed all the required gems: rdf rdf-raptor ffi rdf-json rdf-trix Please help me how to rectify this problem thanks in advance Naveenkumr.R

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• Cannot have a qualifier in the select list while performing a JOIN w/ USING keyword.

  - by JuiceBerry123

  I am looking at a practice test that doesn't have explanations about the correct answers. The question I'm confused about basically asks why the following SQL statement can never work: SELECT oi.order_id, product_jd, order_date FROM order_items oi JOIN orders o USING(order_id); The answer it gave was: "The statement would not execute because the column part of the USING clause cannot have a qualifier in the SELECT list" Can someone elaborate on this? I am pretty stumped.

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• SQL Update help

  - by Cyborgo

  I have a really simple question, is it possible to update a table with new values using just one update statement. Say for example I have a table with author, title, date, popularity. Now I got some new data which has author name, title corresponding new popularity. How do I update the table now in one statement. Note that author and title are not unique.

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• How to concetanate a CHAR

  - by iFloh

  really basic question, I have a string to generate as SQL statement that I need to run through a loop to add all the relevant criteria. How do I concetatate the statement.

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• How to use an IN clause in iBATIS?

  - by furtelwart

  I'm using iBATIS to create select statements. Now I would like to implement the following SQL statement with iBATIS: SELECT * FROM table WHERE col1 IN ('value1', 'value2'); With the following approach, the statement is not prepared correctly and no result returns: SELECT * FROM table WHERE col1 IN #listOfValues#; iBATIS seems to restructure this list and tries to interpret it as a string. How can I use the IN clause correctly?

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