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Unable to add column dynamically into the sqlite table


Unable to add column dynamically into the sqlite table

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Unable to add column dynamically into the sqlite table
Tag : android , By : Brian Cupps
Date : November 25 2020, 07:27 PM


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Dynamically creating a placeholder to insert many column values for a row in SQLite table


Tag : python , By : user98986
Date : March 29 2020, 07:55 AM
I wish did fix the issue. I know that it's possible to insert many column values in a SQLite database using a variable with a tuple of values ('2006-03-28', 'BUY', 'IBM', 1000, 45.00) and a corresponding placeholder (?, ?, ?, ?, ?) in the query string. I am creating the value tuples dynamically in my program and they may hold up to ~300 values. I am wondering if there is a safe (with respect to SQL injection attacks) way to dynamically generate corresponding the placeholder tuple string (?, ?, ?, ...) for the query string? I ask this to avoid tediously counting, adding and deleting ?s as my database structure and value tuples change throughout development. for your thoughts. , Build a string based on the number of items in your values, eg:
def place_holder(values):
    return '({})'.format(', '.join('?' * len(values)))

values = ['a', 'b', 'c']
ph = place_holder(values)
# (?, ?, ?)
your_cursor.execute('insert into your_table values {}'.format(ph), values)

Unable to create SQL Table dynamically in c# -- "invalid column name"


Tag : chash , By : user133834
Date : March 29 2020, 07:55 AM
wish help you to fix your issue You didn't wrap the string in quotes.
When referencing the table as an identifier, quotes aren't needed. Because it's an object name:
... CREATE TABLE C"+nok+"(A char(50), ...
... CREATE TABLE C1(A char(50), ...
... where name = 'C"+nok+"') CREATE ...
... where name = 'C1') CREATE ...

R: dynamically generate column-parsing code for dynamically named column in data table


Tag : r , By : perl
Date : March 29 2020, 07:55 AM
hope this fix your issue I am trying to move some old code from a data frame implementation to data table. Initially I obtain my data from a .csv file, where some cells contain arrays which are converted into character strings by fread, like so: , Don't use the names at all...
for(j in which(names(mydata) %in% names)) set(mydata,i=NULL,j=j,value=strsplit(gsub('^\\[|\\]$','',mydata[[j]]),','))

can i dynamically add new column to sqlite table by calling a method from another class?


Tag : android , By : John Tate
Date : March 29 2020, 07:55 AM
With these it helps It's very bad to have an arbitrary number of columns in a table. You should instead use a second table with a foreign key referencing the ID of a row in the first table.
table user
_id     username    ...
------------------------
1       abc
2       xyz

table photoInfo
userId      photoUri
-------------------------------
1           /path/to/image1.jpg
1           /path/to/image2.jpg
2           /path/to/image3.jpg
1           /path/to/image4.jpg

Unable to name table dynamically at creation - c#, sqlite


Tag : chash , By : Bharath
Date : March 29 2020, 07:55 AM
will help you The way that I approach problems like this is to simplify as much as I can. In this case, simple string substitution should easily resolve your problem without the need to use parameters.
For example:
        command.Text = $@"CREATE TABLE IF NOT EXISTS {tableName}( ... )";
        command.Text = string.Format(@"CREATE TABLE IF NOT EXISTS {0}( ... )", tableName);
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