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How to define two fields “unique” as couple
Is there a way to define a couple of fields as unique in Django?
2 Answers
2
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The cast to value type 'Int32' failed because the materialized value is null
I have the following code. I'm getting error:
8 Answers
8
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How to clear a chart from a canvas so that hover events cannot be triggered?
I'm using Chartjs to display a Line Chart and this works fine:
20 Answers
20
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Fragment onCreateView and onActivityCreated called twice
I'm developing an app using Android 4.0 ICS and fragments.
5 Answers
5
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Are nested transactions allowed in MySQL?
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InnoDB supports SAVEPOINTS.
You can do the following:
CREATE TABLE t_test (id INT NOT NULL PRIMARY KEY) ENGINE=InnoDB;
START TRANSACTION;
INSERT
INTO t_test
VALUES (1);
SELECT *
FROM t_test;
id
---
1
SAVEPOI...
How to do SELECT COUNT(*) GROUP BY and ORDER BY in Django?
I'm using a transaction model to keep track all the events going through the system
2 Answers
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Add margin between a RadioButton and its label in Android?
...dd a little bit of space between a RadioButton and the label while still using Android's built-in components? By default the text looks a little scrunched.
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How does JPA orphanRemoval=true differ from the ON DELETE CASCADE DML clause
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orphanRemoval has nothing to do with ON DELETE CASCADE.
orphanRemoval is an entirely ORM-specific thing. It marks "child" entity to be removed when it's no longer referenced from the "parent" entity, e.g. when you remove the child entity from the...
Input placeholders for Internet Explorer
HTML5 introduced the placeholder attribute on input elements, which allows to display a greyed-out default text.
17 Ans...
ORA-00054: resource busy and acquire with NOWAIT specified or timeout expired
Why am I getting this database error when I update a table?
14 Answers
14
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