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How to modify python script to append data on file using sql server 2019?

How to modify python script to append data on file using sql server 2019?

How to modify python script to append data on file using sql server 2019?

(OP)

I need to append data to excel file already exist from table students on SQL Server .

So I need to append data when dbo.fn_FileExists(@FullFilePath)=1

Excel file already Created on D:\ExportExcel\dbo.students.xlsx with student IDs 1 and 2.

student table with old data

StudentId Name
1 ahmed
2 eslam


Table structure:

CODE --> server

CREATE TABLE [dbo].[students](
    [StudentId] [int] NOT NULL,
    [Name] [varchar](50) NULL,
 CONSTRAINT [PK_students] PRIMARY KEY CLUSTERED 
(
    [StudentId] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]
INSERT [dbo].[students] ([StudentId], [Name]) VALUES (3, N'Sayed')
INSERT [dbo].[students] ([StudentId], [Name]) VALUES (4, N'Michel') 

Python script used

CODE --> python

DECLARE @PythonScript NVARCHAR(MAX) = N''
  declare @SQL NVARCHAR(MAX) = N'select studentid,Name from dbo.students;'
  declare @ExportPath varchar(max)='D:\ExportExcel\'
  declare @TableName varchar(max)='dbo.students'
  declare @FullFilePath varchar(max) = concat(@ExportPath,@TableName+'.xlsx')
--IF File Not Exist
if(dbo.fn_FileExists(@FullFilePath)=0)
BEGIN
   ---print 'Create File'
SET @PythonScript = N'
FullFilePath = ExcelFilePath+TableName+".xlsx"
InputDataSet.to_excel(FullFilePath,sheet_name=TableName.split(".")[-1],index=False)'
   
EXEC   sp_execute_external_script
      @language = N'Python'
     ,@script = @PythonScript
     ,@input_data_1 = @SQL
     ,@params = N'@ExcelFilePath NVARCHAR(MAX), @TableName NVARCHAR(200)'
     ,@ExcelFilePath = @ExportPath -- file path where Excel files are placed
     ,@TableName = @TableName
END
ELSE
BEGIN
---append data
---Here code i need to write to append data
print 'Append data'
END 
When use Python script it will not append data to Excel file from table students. Meaning it will not add student IDs 3 and 4 .

So How to append data from table students to excel file using Python script?

Expected result to file after append

after append data to excel

StudentId Name
1 ahmed
2 eslam
3 Sayed
4 Michel

RE: How to modify python script to append data on file using sql server 2019?

Quote (ahmedsa2018)


When use Python script it will not append data to Excel file from table students.
Yes, because you probably didn't have written this part.

However, the question is if simply rewriting the old excel file with new file containing all data (i.e. old + new) is not better than trying to append new data to the old file.

RE: How to modify python script to append data on file using sql server 2019?

(OP)
so please how to do that
i'm new on python how to do it please
can you help me

RE: How to modify python script to append data on file using sql server 2019?

(OP)
so what code i can write it on else statment to append data

ELSE
BEGIN
---what i write here to append data to excel file by python
END

RE: How to modify python script to append data on file using sql server 2019?

(OP)
can you help me
mikrom

RE: How to modify python script to append data on file using sql server 2019?

(OP)
can any one help me solving this issue please

RE: How to modify python script to append data on file using sql server 2019?

If you didn't solved this problem in the meantime then try following:

When appending try to do exactly the same as when creating

CODE

BEGIN
SET @PythonScript = N'
FullFilePath = ExcelFilePath+TableName+".xlsx"
InputDataSet.to_excel(FullFilePath,sheet_name=TableName.split(".")[-1],index=False)'
   
EXEC   sp_execute_external_script
      @language = N'Python'
     ,@script = @PythonScript
     ,@input_data_1 = @SQL
     ,@params = N'@ExcelFilePath NVARCHAR(MAX), @TableName NVARCHAR(200)'
     ,@ExcelFilePath = @ExportPath -- file path where Excel files are placed
     ,@TableName = @TableName
END 

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