How to convert a existing postgresql db into a Microsoft Access db with python?
I want to convert my postgresql db into a Microsoft Access db.
There are many possible solutions, like transfer table by table and inside the tables row by row.
But which of the solution mide be the best in terms of performance?
Install the ODBC driver and link the tables from PostgreSQL
Mark the link tables and choose Convert to local table
(Optional) Go to Database Tools, Access Database, and select to split the database to have the tables in an external Access database
Related
I'm not sure how to go about doing a one time load of the existing data I have in Oracle to MariaDB. I have DBeaver which I am using to access the databases. I saw an option in DBeaver to migrate the data from Source (Oracle) to Target (MariaDB) with a few clicks, but I'm not sure if that's the best approach.
Is writing a python script a better way of doing it? Should I download another tool to do a one time load? We are using CData Sync to do the incremental loads. Basically, it copies data from one database to another (Oracle to SQL Server for example) and it does incremental loads. I'm not sure if I can use it to do a full time/one time load of all the data I have in my Oracle database to MariaDB. I'm new to this, I've never loaded data before. The thing is, I have over 1100 tables so I can't manually write the schema for each table and do a "CREATE TABLE" statement for all 1100 tables...
Option 1 DBeaver
If DBeaver is willing to try it in a few clicks I'd try and see what it gives for some small tables.
Option 2 MariaDB connect
Alternately there MariaDB connect engine using ODBC or JDBC.
Note you don't need to create table structure for all, but do need the list of table and generate CREATE TABLE t1 ENGINE=CONNECT TABLE_TYPE=ODBC tabname='T1' CONNECTION='DSN=XE;.. for each table.
Then it would be:
create database mariadb_migration;
create table mariadb_migration.t1 like t1;
insert into mariadb_migration.t1 select * from t1;
Option 3 MariaDB Oracle Mode
This uses the Oracle compatibility mode of MariaDB.
Take a SQL dump from Oracle.
Prepend SET SQL_MODE='ORACLE'; to start of the dump.
Import this to MariaDB.
Option 4 SQLines
SQLines offer a Oracle to MariaDB
Small disclaimer, I've not done any of these personally, I just know these options exist.
I have a Postgresql database which is based on SQLAlchemy. I have now to create the same database schema in MS-server. Can I use the same code I've been using to create it? Just by changing the connection engine?
Is it possible to create a new database from pony ORM? We couldn't find it within pony ORM docs, it's always assumed the database exists or is using SQLite file.
We would like to create a testing database and drop it afterwards.
No. Per:
https://docs.ponyorm.org/api_reference.html#sqlite
Supported databases
If you look at the .bind() API for the various databases, SQLite is the only one with create_db. This is because in SQLite creating a database is just creating a single file. The other engines need to go through their own program to initialize a database. You will need to create an independent script that creates the database.
If you have your sqlite database file, you can try using pgloader.
I have understood that how SQLMAP checks for vulnerabilities but now i'm fascinated about how after getting the vulnerability SQLMAP fetches the databases, tables, columns. I tried to understand by looking on their github repo but still.
Have a read of this Hakipedia page on SQLi regarding how the MySQL INFORMATION_SCHEMA table is queried in order to fetch database metadata.
The MySQL INFORMATION_SCHEMA database (available from MySQL 5), is made up of table-like objects (aka, system views), that result in the exposure of metadata in a relational format. The execution of arbitrary injections via SELECT statements are thus possible to retrieve or to format said metadata. Metadata is only accessible to an attacker if the objects retrieved are accessible by the current user account. The INFORMATION_SCHEMA database is automatically created by the server upon MySQL installation, and the metadata within is maintained by the server.
For example, a UNION command could be injected into the SQL command to retrieve data from the INFORMATION_SCHEMA tables.
I want to dump oracle objects like tables and stored procedures using cx_Oracle from python ,
is any tutorial how to do this ?
If you are looking for the source code for tables you can use the following:
select DBMS_METADATA.GET_DDL('TABLE','<table_name>') from DUAL;
for stored procedures you can use
select text from all_source where name = '<procedure name>'
In general this is not a cx_Oracle specific problem, just call the oracle specific tables (like all_source) or functions (like get_ddl) and read it in like any other query. There are more of these sorts of tables (like user_source for source that you the specific user own) in Oracle, but I'm doing this off the top of my head and don't have easy access to an Oracle db to remind myself.