Author Topic: [Not a Bug] Sqlite module creates an SQlite2 database if it doesn't exists.  (Read 1596 times)

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Offline S.L.C

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Description
When the ConnectSQL function is called on a database that doesn't exists then it tries to create one. The thing is that it's creating an SQLite2 database instead of an SQLite3 one.

Reproducible
Always

What you were doing when the bug happened
I was trying to create a table using "CREATE TABLE IF NOT EXISTS" and I noticed it doesn't work. Always fails with the message "Error while executing query: near "NOT": syntax error". Mainly because SQLite2 doesn't support "IF NOT EXISTS".

What you think caused the bug
I'm not sure at the moment because the module code seems to be correct. Probably an SQLite issue but just to be sure.

In whatever IDE/Studio/Editor I load the database it shows as an SQLite2 database. And if I create the database manually as an SQLite3 database then my queries work.

Offline S.L.C

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Re: [Bug] Sqlite module creates an SQlite2 database if it doesn't exists.
« Reply #1 on: September 20, 2014, 06:03:10 pm »
Oh well, it seems that the problem wasn't how the database was created. I've went with a weird way of making sure that the database is actually an SQLite3 database using:
Code: [Select]
// ------------------------------------------------------------------------------------------------
local g_Empty_DB = [83, 81, 76, 105, 116, 101, 32, 102, 111, 114, 109, 97, 116, 32, 51, 0, 4, 0, 1, 1, 0, 64, 32, 32, 0, 0, 0, 2, 0, 0, 0, 2,
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function OpenDatabase(path)
{
// Make sure that a database file was specified and that it's a valid path
if (typeof path != "string") return print("Unknown or missing database location. Operation will be aborted.");
// Create a simple variable to hold our file handle
local f = null;
// Try to open the database as a simple file to see if it exists
try
{
// Trying to open the file for read opperations throws an error if it doesn't exist
f = file(path, "r");
} catch (e) {
// Now try to open the file for write operations and create one since we failed above
f = file(path, "w");
// Make sure that the file could be opened in the previous operation
if (f == null) return print("Could not load or create the database file: " + path);
// Initialize and empty SQLite3 database
foreach (b in g_Empty_DB) f.writen(b, 'b');
// Save and close the newlly create file
f.flush();
f.close();
}
// Now we know that the file exists and can be loaded so let's close it
if (f != null) f.close();
// Try to open the file as an SQLite3 database now
local handle = ConnectSQL(path);
// Check if the previous operation succeeded and notify someone in case of failure
if (handle == null) return print("Unable to open the SQLite database from: " + path);
// The database was opened successfully and the operation is complete
else return handle;
}

OpenDatabase("test.db");

But the whole problem started with escapeSQLString() which added some extra symbols in my query resulting in an invalid query. Wasn't until I made sure that the database is actually an SQLite3 one that I actually took a closer look at my escaped query.

The IDE/Studio/Editor that I was using would load the database as an SQLite2 database and would fail at the "IF NOT EXISTS" part of the query. Which is why it couldn't warn me about those extra symbols in rest of the query. This thread can now be closed. Sorry for bothering anyone  :)
« Last Edit: September 20, 2014, 06:10:09 pm by S.L.C »

Offline stormeus

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Re: [Bug] Sqlite module creates an SQlite2 database if it doesn't exists.
« Reply #2 on: September 20, 2014, 06:50:00 pm »
The database created shouldn't be SQLite2 since we're using an SQLite3 library. I'll leave the bug open for now just so I can ask how you're using escapeSQLQuery.
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Offline S.L.C

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Re: [Bug] Sqlite module creates an SQlite2 database if it doesn't exists.
« Reply #3 on: September 20, 2014, 07:24:07 pm »
This is a partial implementation but you will find test cases for both ways (escaped and original) in the DB.Exec() function: Squirrel Code

This is the generated query without escaping: Unescaped SQLite query

And this is the generated query with escaping: Escaped SQLite query

I've posted the queries on Pastebin because of the limitation in the amount of characters a post can have. There's also a commented out implementation to save both queries in the DB.Exec() function.

EDIT:

There are a few bugs as a result of copy -> paste but you should ignore them.
Code: [Select]
// Line 104
else _Queue[level].pushback(query);
// Becomes
else _Queue[level].push(query);

// Line 164
else if (!::DisconnectSQL(_File)) return print("Unable to close handle for database: " + _File);
// Becomes:
else if (!::DisconnectSQL(_Handle)) return print("Unable to close handle for database: " + _File);

// etc.
« Last Edit: September 20, 2014, 08:16:20 pm by S.L.C »

Offline stormeus

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Re: [Bug] Sqlite module creates an SQlite2 database if it doesn't exists.
« Reply #4 on: September 20, 2014, 11:50:45 pm »
You should not be running escapeSQLString on the entire string. You should only be using escapeSQLString on parameters in the query that would be from user input. For instance:

Code: [Select]
local query = format("INSERT INTO `table` (`col1`, `col2`, `col3`) VALUES (1, 'hardcoded string', '%s')", escapeSQLString(arguments));
QuerySQL(database, query);
Do not PM me for support.




Offline S.L.C

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Re: [Bug] Sqlite module creates an SQlite2 database if it doesn't exists.
« Reply #5 on: September 21, 2014, 01:19:38 am »
I know that it's supposed to be used on individual arguments instead of the entire query and I remember this from doing a wrapper in PHP based on MeekroDB  except for SQLite3 (now lost due to some hardware failure). But I've seen it used like that in some Squirrel code created by other members of this and the unofficial forum which made me believe this is how it's supposed to be used in Squirrel. Anyway, thanks for letting me know of the proper usage. I've learned my lesson. I shall never again let my self be miss leaded by incorrect code posted online :D
« Last Edit: September 21, 2014, 01:22:24 am by S.L.C »