bind-variables

问题 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

问题 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

问题 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

问题 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 : ? 回答1: That's called a bind variable in Oracle. what's the name for ":"? Colon. 回答2: 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)

问题 I am having a hard time using the MySQLdb module to insert information into my database. I need to insert 6 variables into the table. cursor.execute (\"\"\" INSERT INTO Songs (SongName, SongArtist, SongAlbum, SongGenre, SongLength, SongLocation) VALUES (var1, var2, var3, var4, var5, var6) \"\"\") Can someone help me with the syntax here? 回答1: Beware of using string interpolation for SQL queries, since it won't escape the input parameters correctly and will leave your application open to SQL