python string, best way to concat
MRAB
python at mrabarnett.plus.com
Wed Aug 27 18:42:37 EDT 2014
On 2014-08-27 21:31, dennisearlevans at gmail.com wrote:
>
> Hi,
>
> Sorry about the simple question but I am very new to Python.
>
> Anyway, I have a function that will be used to call a stored procedure and I need to format the string with the correct number of parameter markers for the ODBC driver, fairly standard stuff.
>
> What I have works but looks ugly, is there a better way to build or concatenate a string or is a list or a tuple a better option?
>
> the function looks like this
>
> def callSp(self, schema, spName) :
> sqlCode = "{call " + schema + "." + spName + "("
> par_Markers = ""
> y = len(self.param)
> x = 0
> while x < y :
> par_Markers = par_Markers.join("?")
> if (x < y - 1) :
> par_Markers = par_Markers.join(", ")
> x += 1
> self.cmdText = sqlCode + par_Markers + ")}"
> self.ExecuteCursor()
>
> return
>
How many parameters are there? len(self.param)
Make that many placeholders and then join them together with commas:
', '.join(['?'] * len(self.param))
> self.param is a list of parameters. sself.cmdText is the text that will be used to call the stored procedure.
>
> the function would be called like this
>
> class.AddParameter(some value 1)
> class.AddParameter(some value 2)
> callSp("schemaName", "storedProcedureName")
>
> the self.cmdText will look like this just before the ExecuteCursor call
>
> "{call schemaName.StoredProcedureName(?, ?)}"
>
> the code works, but as I said is a bit ugly, is there better methods?
>
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