bind-variables

I've heard that using bind variables is (can be) more efficient, because for subsequent calls with a different bind value, the query itself is still the same, so it doesn't need to be parsed anymore. I understand why this is the case for fixed values. In the cursor below, the value is fixed on 1. If I have a different cursor that is the same, except the 1 becomes 2, it is a diffent query. Clear so far. declare cursor C_CURSOR is select * from TESTTABLE pt where pt.ID = 1; But I wondered if this is also the case when using PL/SQL variables inside the cursor. Are they expanded as if it's a fixed

This question already has an answer here: PL/SQL - Use “List” Variable in Where In Clause 3 answers How to load a large number of strings to match with oracle database? 3 answers WHERE IN condition not accepting String value 4 answers Below is my query and i am passing a string value 1,2 as bind value but it is showing an error as it is not a valid number. I know IN accepts only number but here i need to pass the string value SELECT e.* FROM employee_detail e WHERE e.emp_id IN (:emp_id) You can use string comparisons instead of an IN condition. select ... from ... where ',' || :emp_id || ','

In my scenario, the following query runs fast (0.5 seconds on a table with 70 million rows): select * from Purchases where (purchase_id = 1700656396) and, it even runs fast using bind variables: var purchase_id number := 1700656396 select * from Purchases where (purchase_id = :purchase_id) These run fast because I have an index on the purchase_id column. (Keep reading...) I need to create a query that allows "filtering" on arbitrary columns. This means providing several input variables, and filtering on each one unless it is null . This works fine at first. For example, the following query

What does : stand for in a query? INSERT INTO MyTable (ID) VALUES (:myId) How does it fetch the desired value? Edit: Also what is that sign called? I wanted to search on google, but what's the name for : ? That's called a bind variable in Oracle. what's the name for ":"? Colon. What does ":" stand for in a query? A bind variable . Bind variables allow a single SQL statement (whether a query or DML) to be re-used many times, which helps security (by disallowing SQL injection attacks) and performance (by reducing the amount of parsing required). How does it fetch the desired value? Before a

Succinct Version: I'm looking for a C++ OCI adaptation of the following Java technique, where code is able to bind an array of numbers (the array size can vary) into a non-PL/SQL SELECT statement and then use the resulting array in a WHERE ID IN (...) style check. http://rafudb.blogspot.com/2011/10/variable-inlist.html Original Question: We have a C++ app which talks to Oracle via OCI. We're trying to fix old code which generates SQL queries by concatenating text; instead we want to use bind variables as much as possible. One particular case has come up that we don't have a good solution for.

I am a Python newbie, I am having troubles in the use of bind variables. If I execute the code below everything works fine. bind= {"var" : "ciao"} sql = "select * from sometable where somefield = :bind" cur.prepare(sql) cur.execute(sql,bind) Instead if I add another bind variable I obtain an error. bind= {"var" : "ciao"} sql = "select * from sometable where somefield = :bind and otherfield = :bind" cur.prepare(sql) cur.execute(sql,(bind,bind)) cur.execute(sql,(bind,bind)) Oracle.NotSupportedError: Variable_TypeByValue(): unhandled data I have solved it with cur.execute(sql,(bind["var"],bind[