This is console which is communicating with MySQL Database and returning the Resultset, but in this i am not able to find the type of query . so i have to ask end user select appropriate the Query type(Drop Down Selection) before executing the Query.
is there there any way to find out nature of query so i can choose execute non-query or Data adapter to return the values.
Related
I created a QSqlQuery to get some value from an in-memory database, which been set by
setDatabaseName(":memory:")
When I execute the query, it gives me a QSqlError
QSqlError("", "Unable to fetch row", "No query")
However, when I change the database to be a file database by simply just set name to be "test.sqlite" for example, the query works perfectly without any changes.
Does anyone have any idea why this situation happened? Are there are any difference I need to know to set the query for in-memory database?
I'am working on a Symfony app that provides a rest web service (simple HTTP Request with JSON).
That service check some rules and inserts few lines in two MySQL table (write only).
For optimize reason, even if Doctrine bundle is available, i use native MySQL Query (with bind params) to insert this lines.
My need is : If for any reason, the database is not available, write "runnables" queries into a log file.
The final purpose is that when database is back, i want to be able to execute directly the file's content on the database.
Note that there is no unique constraint (pk is a generated uuid) and no lock or transaction to handle (simple insert statements).
I write a custom SQLLogger, but when $connection->insert(...) is called, the connect fail before logger is called.
So, my question is : There is a way to get the final query (with binded parameters) without database connection ?
Or should i rewrite the mecanism that bind params into query and log it myself when database is not available ?
Best regards,
Julien
As the final query with parameters is build by the database, there is just no way to build the query with PHP and to be garanteed that the query will be the same as the database.
The only way si to build query without binded parameters, but this is clearly not a good practice.
So, i finally decided to store all the JSON (API request body) in a file if the database is not available.
So when the database is back, instead of replay SQL queries, i can replay the original HTTP query.
Hope this late self-anwser will help someone.
Best regards.
I have two postgresql databases, one on my local machine and one on a remote machine. If I'm connected to the local database (with psql), how do I execute a statement that inserts rows into a table on the remote database by selecting rows from a table on the local database? (I've seen this asked a handful of times, like here, here and here, but I haven't yet found a satisfactory answer or anyone saying definitively that it's not possible).
Specifically, assume I have tables remotetable and localtable, each with a single column columnA. I can run this statement successfully:
select dblink_exec('myconnection', 'insert into remotetable (columnA) values (1);');
but what I want to do is this:
select dblink_exec('myconnection', 'insert into remotetable (columnA) select columnA from localtable;');
But this fails with: relation "localtable" does not exist, presumably because localtable does not exist on the remote database.
Is it possible to do what I'm trying to do? If so, how do I indicate that localtable is, in fact, local? All of the examples I've seen for dblink-exec show inserts with static values, not with the results of a local query.
Note: I know how to query data from a remote table and insert into a local table, but I'm trying to move data in the other direction.
If so, how do I indicate that localtable is, in fact, local?
It's not possible because dblink acts as an SQL client to the remote server. That's why the queries sent through dblink_exec must be self-contained: they can do no more than any other query sent by any SQL application. Every object in the query is local to it from the server's perspective.
That is, unless you use another functionality, a Foreign-Data Wrapper with the postgres_fdw driver. This is a more sophisticated way to achieve server-to-server querying in which the SQL engine itself has this notion of foreign and local tables.
I would like to demonstrate SQL injection using Java and sqlite. I'm attempting to execute two queries at the same time with SQL injection. The user is to prematurely end the statement using ;, then add another entry using an insert statement.
Mysql JDBC using allowMultiQueries=true in the connection string.
How can I do this using sqllite?
TIA
allowMultiQueries as a MySQL-specific connection parameter.
I do not know of any SQLite JDBC driver that would allow multiple commands in one query.
Therefore, this kind of SQL injection attack is not possible.
Your best bet would be to construct some query like this:
SELECT * FROM Users WHERE Name = 'admin'--' AND Password = 'whatever'
or this:
SELECT *
FROM Users
WHERE Name = 'admin'
AND Password = 'whatever' or Name='admin'
I have a table Product which have Quantity column, This table get updated thru .net application using Stored procedure based on flag variable. Now im having problem reported from user that even though the flag variable is not set table is getting updated with new values.
Now i need to isolated the cause for the issue.How will i check which update and through which application this table is getting modified. I have no idea about it.
What is the best approach to resolve this issue?
Assuming you are using SQL Server:
You can monitor calls to SQL Server using SQL Server Profiler. You can setup a filter to monitor queries affecting the Product table. The log will show what the query looked like, when the query was executed, the database user executing the query, the name of the application (if that is specified in the connection string) and a bunch of other things.