migra | Like diff but for PostgreSQL schemas | Data Migration library
kandi X-RAY | migra Summary
kandi X-RAY | migra Summary
Like diff but for PostgreSQL schemas
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Top functions reviewed by kandi - BETA
- Get the statements that are selectable
- Calculates the differences between two tables
- Return the difference between two objects
- Returns the difference between two selectables
- Execute command
- Context manager for SQLAlchemy
- Run migration
- Parse command line arguments
- Generate sql statement
- Raise an UnsafeMigrationException if any
- Generates a list of statements that can be used to create changes
- Return a list of statements that should be added to the target
migra Key Features
migra Examples and Code Snippets
Lines of Code : 9License : Strong Copyleft (AGPL-3.0)
Copy$ sudo -u postgres psql
postgres=# CREATE USER bots;
postgres=# CREATE DATABASE highlight WITH OWNER bots;
postgres=# ^D
$ psql highlight -f sql/schema.sql
$ python -m venv .venv
$ source .venv/bin/activate
$ pip install -Ur requirements.txt
$ ./bot. $ sudo -u postgres psql
postgres=# CREATE USER bots;
postgres=# CREATE DATABASE highlight WITH OWNER bots;
postgres=# ^D
$ psql highlight -f sql/schema.sql
$ python -m venv .venv
$ source .venv/bin/activate
$ pip install -Ur requirements.txt
$ ./bot. $ dropdb cm; createdb cm
$ psql -f sql/schema.sql
$ psql -f sql/functions.sql
$ ssh -NfL 5433:localhost:5432 bots@myserver
$ migra postgresql://bots:password@localhost:5433/cm postgresql:///cm --unsafe > migrate.sql
$ edit migrate.sql # as necess Community Discussions
Trending Discussions on migra
QUESTION
I need help with labeling the x-axis of my barplot. I used "names.arg" for showing the years of the values, but I also want to show the names of the different barplots. I would need a second layer of "names.arg" to show the names, but I haven't found a function to do it.
...ANSWER
Answered 2021-Feb-15 at 16:07Since this question has been tagged with the ggplot2 tag, I'll answer with a solution in ggplot. What we're going to do to get the appearance you want, is use facetting and displaying the strips underneath the x-axis.
QUESTION
Referencing back to my previous questions:
How do you add column description for a foreign key in another table utilizing EF 6?
and this previous post:
How to add description to columns in Entity Framework 4.3 code first using migrations?
Based on the above references, how can I insert an extended property (e.g. MS_Description) for a many-many relationship where EF 6 will automatically create a join table behind the scene?
FYI, more reference materials for you:
Towards the Self-Documenting SQL Server Database
...ANSWER
Answered 2020-Nov-30 at 05:35Ok, yes it is possible through migrations. This was definitely an interesting dive into EF's workings as Migrations are something I tend to avoid.
The first clue was here: (https://karatejb.blogspot.com/2018/09/entity-framework-6-code-first-6-add-or.html) using EF to read and write the MS_Description. From there it is a case of enabling this for migrations.
For a DbContext containing two entities, Fidget and Spinner, where each is a many-to-many where I want a FidgetSpinner table generated by EF:
QUESTION
I have been trying to get some data from a website into my NODE application using web-scraping. The data looks to work alright although there are strange operations in the for loop I have created.
ISSUES I'm facing:
- Iterations are not sequential.
- list.length starts from 1 and not 0, WHY?
- Not all the data are added on the table.
So the code I'm using (see below), runs through a list of URL's, then I add them in an object called options and finally pass the option in the request-promise function. The first issue is that on one trial it will execute on this sequence 1, 2, 0 and on another trial it might execute 0, 2, 1. Since I access a server with a GET request I thought it would need time to load the data, so I have tried using async and await which didn't work. I have also tried sleep but also didn't work. The sequence remains unstable.
The second problem is that the length of the list doesn't start with 0 but on 1. (i.e. let list = ["0", "1", "2", "3"] would have length of 4). Is it by default in NODE?
The third issue is that even if all iterations are made (even in wrong sequence), SOMETIMES it would show less data than expected!
...ANSWER
Answered 2020-Jul-17 at 17:03If you're trying to sequence your calls to getJobInformation(), then you can do this:
QUESTION
Are there any tools that can compare the schema of two Postgres databases to an SQL script and is able to handle declaratively partitioned tables correctly?
I've been searching high and low. DataGrip 2018.2 is able to generate DDL that correctly reproduces a declaratively partitioned table and all of the partitions, but it does not generate a script. Migra (a Python tool) generates a script, but treats partitions as standalone tables.
...ANSWER
Answered 2018-Dec-20 at 15:26I had a similar issue but it was related to inheritance table in postgresql and I tried the following 2 options with success:
- 1st option:
pg_dump -s db1> first
pg_dump -s db2> second
diff first second
(obviously wont generate SQL to remedy the differences)
- 2nd option: TiCodeX SQL Schema Compare (https://www.ticodex.com) It's a nice tools that runs in Windows, Linux and Mac and can compare the schema of MS-SQL, MySQL and PostgreSQL database. Easy to use and effective. It may help you.
QUESTION
I'm trying to calculate differences in SEX for each SPECIES in my df over 5 variables (WING; WINGPRI; WEIGHT, BEAK and TARSUS) I've tried dozens of codes (I'm a begginer) and I keep getting errors or the codes don't give me the desired output etc.
This is about as close as I've gotten:
...ANSWER
Answered 2018-Oct-10 at 17:28Here's an example based on the data you posted
QUESTION
I have a Channels collection
...ANSWER
Answered 2018-Sep-01 at 02:36QUESTION
I'm programming an SCADA with Intouch R2 SP1. In this SCADA I have to make some reports in excel. The report it's simply writting 10 values into specific cells. The thing is that the code I'm using is working with Office 2010 which is the version I have in my computer, but when I installed the SCADA in the new computer, we bought a licence of Office 2016. When I try to generate the report with this computer it makes everything right except writting into the cells.
So my questions are this: Does anyone know how to export this data to an excel spreadsheet using the vb.net of Intouch Archestra Graphics? If not, is it possible to export data to excel from SQL Server with a SQL Query?
The code I'm using is below, here you can see that I'm copying the excel file to a new location changing it's name and I open the new excel file. After that I use the function WWPoke() to insert the desired values into Excel.
...ANSWER
Answered 2018-Jan-22 at 07:13The problem is that the function WWPoke() is not compatible with 64-bit OS, it wasn't about the version of the Office. So what I've done is creating a .csv file and with an excel macro import the data to the report.
QUESTION
I have started an EF6 project to store measurement results from analytical instruments. Each instrument has a built-in PC with and it's own results database.
Initially, the database initializer CreateDatabaseIfNotExists was used. On database creation, it creates an entry in the __MigrationHistory table with a non-unique MigrationId entry (timestamp differs from instrument to instrument, e.g. 201706011336597_InitialCreate), the ContextKey if the fully qualified type of my derived DbContext.
After a while, it was decided to add more result data to the database... Furtunately, only three new tables are required. There are no changes in the existing tables.
For that, I wanted to use the MigrateDatabaseToLatestVersion initializer. But I have to support the following two scenarios:
- Existing database with the non-unique MigrationId, that has to be migrated to the extended version with the three new tables.
- No database, create the database with the the MigrateDatabaseToLatestVersion initializer.
How can I do this?
I have created an initial migration using the add-migration PM console command from the initial DbContext. That works well with scenario 2 (no database exists). From that starting point I can update my DbContext and create a new migration with the three new tables.
But how to support scenario 1? The Up() method of the initial migration contains the table creation code, that is not nessessary, because the tables already exist. Is an empty migration (add-migration -IgnoreChanges) helpful, maybe with a later timestamp than the initial migration?
Note: I have no access from the PM console to the target database(s), only on my developer machine to a test database.
Thanks and best regards
Karsten
Update: I have modified the created initial migration with the static flag TablesAlreadyCreated.
...ANSWER
Answered 2017-Jun-06 at 13:50This is a very common scenario that EF handles nicely. The non-migration initializers (CreateDatabaseIfNotExists, etc) should be used in very early development (when you don't care about the data except for stuff that is seeded).
Once you are switching to migrations you should generate a baseline migration that takes a snapshot of your current model as you indicate (add-migration MyStartPoint -IgnoreChanges). This adds a migration with no Up() code and stores the current state of your code first model so that when you change the model only those changes are reflected. You could accomplish the same thing by commenting out the items that exist from the Up() code.
Now when you run against an existing database, it will check __MigrationHistory to see which migrations have been applied. If the database does not exist, it will be created. See here and here for more info.
Not sure what you are talking about with the MigrationId. EF handles that automatically unless you change your namespace (there is a workaround for that as well).
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No vulnerabilities reported
Install migra
You can use migra like any standard Python library. You will need to make sure that you have a development environment consisting of a Python distribution including header files, a compiler, pip, and git installed. Make sure that your pip, setuptools, and wheel are up to date. When using pip it is generally recommended to install packages in a virtual environment to avoid changes to the system.
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