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fix: preserve existing data in update_excel function #4

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fix: preserve existing data in update_excel function #4

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8 changes: 6 additions & 2 deletions mcp_excel_server/server.py
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Original file line number Diff line number Diff line change
Expand Up @@ -292,9 +292,13 @@ def update_excel(file_path: str, data: str, sheet_name: Optional[str] = "Sheet1"
if sheet != sheet_name:
df = pd.read_excel(excel_file, sheet_name=sheet)
df.to_excel(writer, sheet_name=sheet, index=False)

# ✅ Load existing sheet and merge new data into it
existing_df = pd.read_excel(excel_file, sheet_name=sheet_name)
for col in new_df.columns:
existing_df[col] = new_df[col].values

# Write new data to specified sheet
new_df.to_excel(writer, sheet_name=sheet_name, index=False)
existing_df.to_excel(writer, sheet_name=sheet_name, index=False)
elif ext == '.csv':
new_df.to_csv(file_path, index=False)
elif ext == '.tsv':
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