ubuntuask.com
-
5 min readTo resize and draw an image using wxPython, you can start by loading the image using the wx.Image class. You can then create a bitmap from the image using the wx.Bitmap class.To resize the image, you can use the Scale method of the image object. Specify the new width and height that you want for the image.To draw the resized image on a wxPython window, you can use the wx.DC class.
-
6 min readTo draw text in a bitmap using wxPython, you can first create a wx.Image object with the desired dimensions. Then you can convert the image to a wx.Bitmap object using the ConvertToBitmap() method. Next, you can create a wx.MemoryDC object and select the bitmap into it. Finally, you can use the DrawText() method of the wx.MemoryDC object to draw the text onto the bitmap at the specified coordinates.
-
7 min readTo merge (join) two wx.Bitmap images in wxPython, you can use the Merge method provided by the wxPython library. This method allows you to combine two bitmap images into a single bitmap.First, create two wx.Bitmap objects representing the images you want to merge. Then, use the Merge method to combine the two bitmaps by specifying the position where you want to place the second bitmap on the first bitmap.Here is an example of how you can merge two wx.
-
5 min readTo join a table with a result column in Oracle, you can use a subquery in your SQL statement. This subquery can be used as a virtual table that you can then join with other tables in your query.For example, you can write a query like this:SELECT t1.column1, t2.column2 FROM table1 t1 JOIN (SELECT column1 FROM table2 WHERE condition) t2 ON t1.column1 = t2.column1;In this query, the subquery (SELECT column1 FROM table2 WHERE condition) is used to get the result column from table2.
-
7 min readTo insert a CLOB (Character Large OBject) into an Oracle database via Node.js, you can use the oracledb module to establish a connection to the database and execute the SQL query.Here's an example of how you can insert a CLOB data into an Oracle database using Node.js:First, you need to install the oracledb module by running npm install oracledb in your Node.js project. Then, you need to establish a connection to your Oracle database using the getConnection method from the oracledb module.
-
2 min readTo get the screen dpi using wxPython, you can use the wx.ScreenDC() method to create a device context for the screen. Then, you can use the GetPPI() method on the device context object to retrieve the screen's resolution in dots per inch (dpi). This will give you the horizontal and vertical dpi values of the screen. You can then use these values to calculate the overall screen dpi if needed.
-
3 min readTo get the distinct keys from a JSON column in Oracle, you can use the JSON_TABLE function to convert the JSON data into rows and columns. Then, you can use the DISTINCT keyword to retrieve only the unique keys from the JSON column. By doing this, you can easily extract the distinct keys present in the JSON data stored in the Oracle database.[rating:53c0aa98-76b9-464d-9d7f-79965c5bfde8]What is the logic behind using distinct keys when querying a JSON column in Oracle.
-
3 min readIn PL/SQL Oracle, it is not possible to return multiple values of different types from a function or procedure. However, you can achieve this by using a user-defined datatype, a record type, or by returning a collection (such as a nested table or a varray) that contains multiple values of different types.For example, you can create a record type that contains fields for each of the values you want to return, and then return an instance of this record type from your function or procedure.
-
4 min readTo check existence in Oracle using a condition, you can use the EXISTS keyword in a SQL query. The EXISTS keyword is used to check if a subquery returns any rows. You can use it in combination with a WHERE clause to apply a condition for checking the existence of a record. The syntax for using EXISTS in Oracle is as follows:SELECT column1, column2 FROM table_name WHERE EXISTS (subquery);In the subquery, you can specify the condition based on which you want to check for the existence of records.
-
4 min readTo close an opened cursor in Oracle, you can use the CLOSE statement followed by the cursor name. This statement tells Oracle to release the resources associated with the cursor and free up memory.It is important to close a cursor once you are done using it to avoid unnecessary memory usage and potential performance issues. Failure to close a cursor can result in increased memory consumption and slower database operations.
-
5 min readAfter updating a value in Oracle, you can check the previous value by using the RETURNING clause in the SQL statement. This clause allows you to retrieve the old value of the column before it was updated. You can use this in combination with a SELECT statement to view the previous value after the update has been executed.