git add simple application

app.py

@@ -1,4 +1,67 @@
+from io import StringIO
 import streamlit as st
 
-x = st.slider('Select a value')
-st.write(x, 'squared is', x * x)
+
+class CoreClient:
+
+    def generate(self, source: str, target: str, code: str):
+        return source
+
+
+st.set_page_config(
+    page_title='A SQL Generative Pre-trained Transformer',
+    layout='wide',
+    initial_sidebar_state='expanded'
+)
+
+databases = ['Oracle', 'SQLServer', 'MySQL', 'DB2', 'PostgreSQL', 'Snowflake', 'Redshift']
+# -------------
+
+st.sidebar.header('A SQL Transformer')
+
+source_database = st.sidebar.selectbox(
+    label='Source Database',
+    options=databases,
+    index=0
+)
+
+target_database = st.sidebar.selectbox(
+    label='Target Database',
+    options=databases,
+    index=4
+)
+
+input_text = st.sidebar.text_area(
+    label='Insert SQL',
+    placeholder='select * from now()'
+)
+
+input_file = st.sidebar.file_uploader(
+    label="Choose a SQL file",
+    accept_multiple_files=False)
+
+client = CoreClient()
+
+
+def transform():
+    code = input_text
+    source = source_database
+    target = target_database
+    if code:
+        ts = client.generate(source, target, code)
+        for solution in ts:
+            st.code(solution, language='sql')
+    else:
+        if input_file is not None:
+            # To convert to a string based IO:
+            stringio = StringIO(input_file.getvalue().decode("utf-8"))
+            # To read file as string:
+            sql = stringio.read()
+            ts = client.generate(source, target, sql)
+            for solution in ts:
+                st.code(solution, language='sql')
+
+
+# ---------------------------------------
+
+transform()