How to execute SQL while loops through pandas library sqlalchemy [duplicate]

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Closed 6 months ago.

I am trying to execute and sql query through python. This is based on my first question on how to split columns based on two dataframes(Splittin of company extensions and company name). Since I was finding it difficult to code in python, I used sql query to split and executed through python. I am able to execute just queries like update, etc but when I try using loops am not getting an output nor any error.

My input:

Original_Input                                            Cleansed_Input                        
DORO INC ( O/S DORO SAFETY & SECURITY)                    DORO INC OS DORO SAFETY SECURITY      
Iris Diagnostics, a Division of Iris International Inc    Iris Diagnostics a Division of Iris 
                                                          International Inc     
GINGI-PAK a division of The Belport Co., Inc.             GINGIPAK a division of The Belport Co Inc

My expected output:

Original_Input                                            Cleansed_Input                             
DORO INC ( O/S DORO SAFETY & SECURITY)                    DORO INC OS DORO SAFETY SECURITY      
Iris Diagnostics, a Division of Iris International Inc    Iris Diagnostics a Division of Iris 
                                                          International Inc     
GINGI-PAK a division of The Belport Co., Inc.             GINGIPAK a division of The Belport Co Inc

Core_Input                                                Type_Input

Iris Diagnostics a Division of Iris International         Incorporated       
GINGIPAK a division of The Belport                        Company Incorporated

When I tried just the update statement it was working fine but then there is a priority given for the splitting so I tried using while loop and execute through python which didn't work. It was working fine in sql but not through python.

In the code Tempcompanyname is my table with input and output. Company_Extension is another table with extension, abbreviation and priority.

Eg of my second table is as below.

Name_Extension  Company_Type         Priority
co llc          Company LLC            2
Pvt ltd         Private Limited        8
Corp            orporation             4
Co inc          Company Incorporated   9

This is my piece of code.

engine.execute('''Declare @priority int = (select max(priority) from [company_Extension])
              Declare @p int=1
              while @p <= @priority
              begin

              update A 
              set A.Type_input = B.Company_Type 
              from [TempCompanyName]A (nolock), [company_Extension]B  where  A.Cleansed_Input like 
              '%'+B.Name_Extension and Priority=@p

              update A 
              set A.Core_Input =replace(A.[Cleansed_Input],B.Name_Extension,'')
              from [TempCompanyName]A (nolock), [company_Extension]B  where  A.Cleansed_Input like 
              '%'+B.Name_Extension and Priority=@p

              set @p=@p+1
              end''')

engine.execution_options(autocommit=True)

Thanks in advance for the help.

来源：https://stackoverflow.com/questions/59820976/how-to-execute-sql-while-loops-through-pandas-library-sqlalchemy

标签

python

pandas

split

sqlalchemy