Filter for st data_editor don't work on Snowflake

Using Streamlit
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1

Hello,
I have developed a Streamlit app on Snowflake, which allows me to modify values in a table. However, I’ve noticed that I’m unable to filter the data in the dataframe using ‘edited_data = st.data_editor(filtered_data, num_rows=“dynamic”)’ on Snowflake. Can you please assist me?"

Best
Zied

2

Can you explain in more detail what you’ve tried and what unexpected result you are getting? Can you provide a simplified code snippet?

3

Hi Mathcatsand ,

Thank you so much for your response. I would be happy if I can resolve this issue.

The application allows the user to choose a table via a dropdown menu and then gives them the ability to modify the table (edit, insert, delete rows).

With st.data_editor, it’s not possible to filter the data. Given that the tables are large, I would like to have a filter. I have coded a filter with dropdown menus that include the column names and the unique values in each column.

The idea is to filter the data saved in a DataFrame called filtered_data and then edit it with st.data_editor.

The problem is that every time I change the filter, the previous modifications are lost.

Thank you in advance for your help.

Below is my script:




import streamlit as st
from snowflake.snowpark.context import get_active_session
import pandas as pd

# Set page layout to wide
st.set_page_config(layout="wide")

# Get the active session
session = get_active_session()

# List of tables
tables = ["DATA_SOURCE", "DATA_FIELDS", "DATA_TEST"]

@st.cache_data
# Function to create backup table if it doesn't exist
def create_backup_table(table_name):
    backup_table = f"{table_name}_BACKUP"
    # Check if backup table exists
    check_query = f"SELECT * FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_SCHEMA = 'BOX' AND TABLE_NAME = '{backup_table}'"
    result = session.sql(check_query).collect()
    if not result:
        # Retrieve data from the original table
        query_main_table = f"SELECT * FROM DB.BOX.{table_name}"
        data_main_table = session.sql(query_main_table).to_pandas()
        
        # Create backup table using write_pandas
        session.write_pandas(data_main_table, table_name=backup_table, database="DB", schema="BOX", overwrite=True, auto_create_table=True)
        st.info(f"Backup table {backup_table} created.", icon="ℹ️")


# Create backups for all tables if they don't exist
for table in tables:
    create_backup_table(table)

# Dropdown menu to select a table
selected_table = st.selectbox("Select a table", tables)

# Print Title 
st.subheader("Edit Data :")

# Retrieve data from the selected table
query_main_table = f"SELECT * FROM DB.BOX.{selected_table}"
data_main_table = session.sql(query_main_table).to_pandas()

# Get the list of columns
columns = data_main_table.columns.tolist()

# Allow user to select columns for filtering
selected_columns = st.multiselect("Select columns for filtering", columns)

# Filter data based on selected columns and values
filtered_data = data_main_table.copy()
for column in selected_columns:
    unique_values = data_main_table[column].unique()
    selected_values = st.multiselect(f"Select values for {column}", unique_values)
    if selected_values:
        filtered_data = filtered_data[filtered_data[column].isin(selected_values)]

# Display data in the Data Editor parm ,on_change= True
edited_data = st.data_editor(filtered_data, num_rows="dynamic", key="editor")

# Button to submit the changes to the main table
if st.button('Submit'):
    try:
        # Merge modified data with original data
        merged_data = data_main_table.merge(filtered_data, how="left", indicator=True)
        
        # Update rows that have been modified
        for index, row in edited_data.iterrows():
            if merged_data.loc[index, '_merge'] == 'both':
                merged_data.loc[index, merged_data.columns] = row
        
        # Remove the merge indicator column
        merged_data.drop(columns='_merge', inplace=True)
        
        # Convert merged data to DataFrame
        df = pd.DataFrame(merged_data)
        
        # Insert the new data in the main table
        session.write_pandas(df, table_name=selected_table, database="DB", schema="BOX", overwrite=True, auto_create_table=False)
        
        st.success(f"Changes have been added to the table {selected_table}.", icon="✅")
    except Exception as e:
        st.error(f"An error occurred: {e}")

# Button to rollback the changes
if st.button('Rollback'):
    try:
        # Delete data from the main table
        query_delete_main_table = f"DELETE FROM DB.BOX.{selected_table}"
        session.sql(query_delete_main_table).collect()
        
        # Retrieve data from the backup table and insert into the main table
        query_rollback = f"INSERT INTO DB.BOX.{selected_table} SELECT * FROM DB.BOX.{selected_table}_BACKUP"
        session.sql(query_rollback).collect()
        
        st.success("Rollback performed successfully.", icon="✅")
    except Exception as e:
        st.error(f"An error occurred during rollback: {e}")

# Display the current table
data_main_table_updated = session.sql(query_main_table).to_pandas()
st.write(f"Current Table: {selected_table}")
st.dataframe(data_main_table_updated, use_container_width=True)

Best

4

I see. Yes, like all widgets, if you change anything that defines the widget, it will lose state and be created anew. If you want to allow re-filtering between edits, you’ll need to collect the existing edits before applying the new filter.

5

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