python - getting the id of a created record in SQLAlchemy -


How do I get a record ID created in SQLAlchemy?

I am doing: 

  enter the engine.execute ("User values ​​(1, 'John')"
< / Div>

When you execute plain text statements, then you are at the mercy of the DBAPI that you are using as Whether or not the new PK value is available and what it means. You will take it as a result with SQLite and MySQL DBAPI. Stolide, which gives you the value of .lastrowid for the cursor. With PG, Oracle, etc., there is no ".lastrowid" - as someone else has said that you can use "returning" for those people, resulting in result.fetchone () (though the oracle's Using Returning, is not taking advantage of again to produce SQLite expression, many weird steps are required), or if returning is not available, then you can directly access sequence access (NEXTVAL in PG), or "POS Fetch can use "operation (PR Krurvil, @@ identity or Scop_ identity ()) are MSSQL).

Does the Correct Correct? This is the reason that you are better off using table.insert () . The primary system of SQLLame to provide new generation PK is designed to work with these structures. The one you are there, the results. Last_inserted_ids () method gives you a newly generated (possibly composite) PK in all cases regardless of the backend. The above methods of .lastrowid, sequence execution, returning etc. are all for you (0.6 uses returning if available).


Comments

Post a Comment

Popular posts from this blog

sql - dynamically varied number of conditions in the 'where' statement using LINQ -

I am using my first project LINQ (in mvc), so maybe there's something very simple that I remember. However, a day of searching and experimenting does not work, so it works. I am trying to write a LINQ query (Linux to SQL) in which in many cases where the statement is different from an OR or an AND. We do not know how many conditions are going in the query till runtime. This search is for filter control, where the user can choose multiple criteria for filtering. Select from table where table.col = 1 or table.col = 2 or table.col = 7 .... 'Other number of conditions Before I just create the SQL query as a string, while looping over all the situations. However, it seems that there should be a good way to do this in LINQ. I tried to use Expression trees, but they had a second thought for this moment on my head, where the lambda function was to be executed inside the statement such as: values ​​for matchingRows = matchingRows for each value Where (function (row) row.c...
Read more

asp.net mvc - Dynamically Generated Ajax.BeginForm -

I have a problem with ASP.NET MVC Ajax forms. I generate many Ajax form in a table such as: & Lt; Input type = "submit" name = "activity" value = "add activity" / & gt; & Lt;%}% & gt; & Lt; / TD & gt; & Lt; / TR & gt; & Lt;%}% & gt; So far so good. When I post one of those forms, it gives a partial view in a div, and in this new partial view a new Ajax Beginnform (which is not in Genesis form) This second Ajax Beginnorf is exactly like the ones I got on the table, but when I post it, I do not get the "Ajax Post", but a normal post that sends me to a new page, I do not know whether the two Ajax forms What is the reason for the difference between, why is it the "dynamically generated" Ajax form behaves like a normal HTML form? By the way, I know that I can do it in different ways using javascript, but I would like to understand whether it can only be done using MVC helplars and Ajax lib...
Read more

Debug on symbian -

I am using trk for phone debug This works well for the Holorld project But when I start the project in phone debug mode 1) the load failed 2) TrkProtocolPlugin: to target the specified file Failure (please verify If any body understands what problem I am experiencing, then this problem helps me Pre-release If the application has the privileges assigned (with the appropriate certificate) itemprop = "text" > In your case, I will check: / li> If there is no conflict of application ID with any other application of device If there are problematic commands in the installation package (for example copy copy for non-accessible directories)
Read more