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my_flask_app/__init__.py

+from flask import Flask
+
+app = Flask(__name__, template_folder="templates")
+
+import my_flask_app.main

my_flask_app/models/models.py

+import re
+
+class Theme:
+    def __init__(self, color, fillcolor, fillcolorC,
+            bgcolor, icolor, tcolor, style, shape, pencolor, penwidth):
+        self.color = color
+        self.fillcolor = fillcolor
+        self.fillcolorC = fillcolorC
+        self.bgcolor = bgcolor
+        self.icolor = icolor
+        self.tcolor = tcolor
+        self.style = style
+        self.shape = shape
+        self.pencolor = pencolor
+        self.penwidth = penwidth
+
+
+class Table():
+    def __init__(self, name, comment):
+        self.name = name
+        self.comment = comment if comment is not None and comment != 'None' else ''
+        self.label = None
+
+        self.columns = []           # list of all columns
+        self.uniques = {}           # dictionary with UNIQUE constraints, by name + list of columns
+        self.pks = []               # list of PK columns (if any)
+        self.fks = {}               # dictionary with FK constraints, by name + list of FK columns
+
+
+    @classmethod
+    def getClassName(cls, name, useUpperCase, withQuotes=True):
+        if re.match("^[A-Z_0-9]*$", name) == None:
+            return f'"{name}"' if withQuotes else name
+        return name.upper() if useUpperCase else name.lower()
+
+    def getName(self, useUpperCase, withQuotes=True):
+        return Table.getClassName(self.name, useUpperCase, withQuotes)
+
+    def getColumn(self, name):
+        for column in self.columns:
+            if column.name == name:
+                return column
+        return None
+
+    def getDotShape(self, theme, showColumns, showTypes, useUpperCase):
+        fillcolor = theme.fillcolorC if showColumns else theme.fillcolor
+        colspan = "2" if showTypes else "1"
+        tableName = self.getName(useUpperCase, False)
+
+        s = (f'  {self.label} [\n'
+            + f'    fillcolor="{fillcolor}" color="{theme.color}" penwidth="1"\n'
+            + f'    label=<<table style="{theme.style}" border="0" cellborder="0" cellspacing="0" cellpadding="1">\n'
+            + f'      <tr><td bgcolor="{theme.bgcolor}" align="center"'
+            + f' colspan="{colspan}"><font color="{theme.tcolor}"><b>{tableName}</b></font></td></tr>\n')
+
+        if showColumns:
+            for column in self.columns:
+                name = column.getName(useUpperCase, False)
+                if column.ispk: name = f"<u>{name}</u>"
+                if column.fkof != None: name = f"<i>{name}</i>"
+                if column.nullable: name = f"{name}*"
+                if column.identity: name = f"{name} I"
+                if column.isunique: name = f"{name} U"
+                datatype = column.datatype
+                if useUpperCase: datatype = datatype.upper()
+
+                if showTypes:
+                    s += (f'      <tr><td align="left"><font color="{theme.icolor}">{name}&nbsp;</font></td>\n'
+                        + f'        <td align="left"><font color="{theme.icolor}">{datatype}</font></td></tr>\n')
+                else:
+                    s += f'      <tr><td align="left"><font color="{theme.icolor}">{name}</font></td></tr>\n'
+
+        return s + '    </table>>\n  ]\n'
+
+
+    def getDotLinks(self, theme):
+        s = ""
+        for constraint in self.fks:
+            fks = self.fks[constraint]
+            fk1 = fks[0]
+            dashed = "" if not fk1.nullable else ' style="dashed"'
+            arrow = "" if fk1.ispk and len(self.pks) == len(fk1.fkof.table.pks) else ' arrowtail="crow"'
+            s += (f'  {self.label} -> {fk1.fkof.table.label}'
+                + f' [ penwidth="{theme.penwidth}" color="{theme.pencolor}"{dashed}{arrow} ]\n')
+        return s
+
+
+class Column:
+    def __init__(self, table, name, comment):
+        self.table = table
+        self.name = name
+        self.comment = comment if comment is not None and comment != 'None' else ''
+        self.nullable = True
+        self.datatype = None        # with (length, or precision/scale)
+        self.identity = False
+
+        self.isunique = False
+        self.ispk = False
+        self.pkconstraint = None
+        self.fkof = None            # points to the PK column on the other side
+
+
+    def getName(self, useUpperCase, withQuotes=True):
+        return Table.getClassName(self.name, useUpperCase, withQuotes)
+
+
+    def setDataType(self, datatype):
+        self.datatype = datatype["type"]
+        self.nullable = bool(datatype["nullable"])
+
+        if self.datatype == "FIXED":
+            self.datatype = "NUMBER"
+        elif "fixed" in datatype:
+            fixed = bool(datatype["fixed"])
+            if self.datatype == "TEXT":
+                self.datatype = "CHAR" if fixed else "VARCHAR"
+
+        if "length" in datatype:
+            self.datatype += f"({str(datatype['length'])})"
+        elif "scale" in datatype:
+            if int(datatype['precision']) == 0:
+                self.datatype += f"({str(datatype['scale'])})"
+                if self.datatype == "TIMESTAMP_NTZ(9)":
+                    self.datatype = "TIMESTAMP"
+            elif "scale" in datatype and int(datatype['scale']) == 0:
+                self.datatype += f"({str(datatype['precision'])})"
+                if self.datatype == "NUMBER(38)":
+                    self.datatype = "INT"
+                elif self.datatype.startswith("NUMBER("):
+                    self.datatype = f"INT({str(datatype['precision'])})"
+            elif "scale" in datatype:
+                self.datatype += f"({str(datatype['precision'])},{str(datatype['scale'])})"
+                #if column.datatype.startswith("NUMBER("):
+                #    column.datatype = f"FLOAT({str(datatype['precision'])},{str(datatype['scale'])})"
+        self.datatype = self.datatype.lower()
\ No newline at end of file

my_flask_app/templates/select_database.html

+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <title>Select Database</title>
+    <!-- Add some CSS for styling -->
+</head>
+<body>
+    <div>
+        <!-- <h3>Current Database: {{ current_db }}</h3> -->
+        <h3>Select a Database</h3>
+        <ul>
+            {% for db in databases %}
+                <li>{{ db }}</li>
+            {% endfor %}
+        </ul>
+    </div>
+</body>
+</html>