From 9810af779754e1f9f24697a312cf92b4e0870d2b Mon Sep 17 00:00:00 2001
From: Jeremy Howard <github@jhoward.fastmail.fm>
Date: Sat, 7 Sep 2024 08:54:23 +1000
Subject: [PATCH] fixes #24

---
 fastlite/_modidx.py |  1 +
 fastlite/core.py    | 20 ++++++++++++--
 nbs/00_core.ipynb   | 64 ++++++++++++++++++++++++++++++++++++++++++---
 3 files changed, 79 insertions(+), 6 deletions(-)

diff --git a/fastlite/_modidx.py b/fastlite/_modidx.py
index 617d0ae..a653404 100644
--- a/fastlite/_modidx.py
+++ b/fastlite/_modidx.py
@@ -6,6 +6,7 @@
                 'git_url': 'https://github.com/AnswerDotAI/fastlite',
                 'lib_path': 'fastlite'},
   'syms': { 'fastlite.core': { 'fastlite.core.Database.create': ('core.html#database.create', 'fastlite/core.py'),
+                               'fastlite.core.Database.import_file': ('core.html#database.import_file', 'fastlite/core.py'),
                                'fastlite.core.Database.q': ('core.html#database.q', 'fastlite/core.py'),
                                'fastlite.core.Database.t': ('core.html#database.t', 'fastlite/core.py'),
                                'fastlite.core.Database.v': ('core.html#database.v', 'fastlite/core.py'),
diff --git a/fastlite/core.py b/fastlite/core.py
index 3eba638..9a32ef2 100644
--- a/fastlite/core.py
+++ b/fastlite/core.py
@@ -14,6 +14,7 @@
 from fastcore.xml import highlight
 from fastcore.xtras import hl_md, dataclass_src
 from sqlite_minutils.db import *
+from sqlite_minutils.utils import rows_from_file,TypeTracker,Format
 import types
 
 try: from graphviz import Source
@@ -168,7 +169,22 @@ def create(
     res.cls = cls
     return res
 
-# %% ../nbs/00_core.ipynb 58
+# %% ../nbs/00_core.ipynb 55
+@patch
+def import_file(self:Database, table_name, file, format=None, pk=None):
+    "Import path or handle `file` to new table `table_name`"
+    if isinstance(file, str): file = file.encode()
+    if isinstance(file, bytes): file = io.BytesIO(file)
+    with maybe_open(file) as fp: rows, format_used = rows_from_file(fp, format=format)
+    tracker = TypeTracker()
+    rows = tracker.wrap(rows)
+    tbl = self[table_name]
+    tbl.insert_all(rows, alter=True)
+    tbl.transform(types=tracker.types)
+    if pk: tbl.transform(pk=pk)
+    return tbl
+
+# %% ../nbs/00_core.ipynb 61
 def _edge(tbl):
     return "\n".join(f"{fk.table}:{fk.column} -> {fk.other_table}:{fk.other_column};"
                      for fk in tbl.foreign_keys)
@@ -186,7 +202,7 @@ def _tnode(tbl):
   </table>"""
     return f"{tbl.name} [label=<{res}>];\n"
 
-# %% ../nbs/00_core.ipynb 59
+# %% ../nbs/00_core.ipynb 62
 def diagram(tbls, ratio=0.7, size="10", neato=False, render=True):
     layout = "\nlayout=neato;\noverlap=prism;\noverlap_scaling=0.5;""" if neato else ""
     edges  = "\n".join(map(_edge,  tbls))
diff --git a/nbs/00_core.ipynb b/nbs/00_core.ipynb
index d6e19fa..6af0874 100644
--- a/nbs/00_core.ipynb
+++ b/nbs/00_core.ipynb
@@ -40,6 +40,7 @@
     "from fastcore.xml import highlight\n",
     "from fastcore.xtras import hl_md, dataclass_src\n",
     "from sqlite_minutils.db import *\n",
+    "from sqlite_minutils.utils import rows_from_file,TypeTracker,Format\n",
     "import types\n",
     "\n",
     "try: from graphviz import Source\n",
@@ -750,7 +751,7 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "#| exports\n",
+    "#| export\n",
     "@patch\n",
     "def create(\n",
     "    self: Database,\n",
@@ -827,7 +828,7 @@
     {
      "data": {
       "text/plain": [
-       "<Table cat (id, name, age, city)>"
+       "<Table cat (id, name, age, city, breed)>"
       ]
      },
      "execution_count": null,
@@ -870,11 +871,12 @@
      "name": "stdout",
      "output_type": "stream",
      "text": [
-      "CREATE TABLE [cat] (\n",
+      "CREATE TABLE \"cat\" (\n",
       "   [id] INTEGER PRIMARY KEY,\n",
       "   [name] TEXT,\n",
       "   [age] INTEGER,\n",
-      "   [city] TEXT\n",
+      "   [city] TEXT,\n",
+      "   [breed] TEXT\n",
       ")\n"
      ]
     }
@@ -892,6 +894,60 @@
     "db.t.cat.drop()"
    ]
   },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "#| export\n",
+    "@patch\n",
+    "def import_file(self:Database, table_name, file, format=None, pk=None):\n",
+    "    \"Import path or handle `file` to new table `table_name`\"\n",
+    "    if isinstance(file, str): file = file.encode()\n",
+    "    if isinstance(file, bytes): file = io.BytesIO(file)\n",
+    "    with maybe_open(file) as fp: rows, format_used = rows_from_file(fp, format=format)\n",
+    "    tracker = TypeTracker()\n",
+    "    rows = tracker.wrap(rows)\n",
+    "    tbl = self[table_name]\n",
+    "    tbl.insert_all(rows, alter=True)\n",
+    "    tbl.transform(types=tracker.types)\n",
+    "    if pk: tbl.transform(pk=pk)\n",
+    "    return tbl"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "This uses [`sqlite_utils.utils.rows_from_file`](https://sqlite-utils.datasette.io/en/stable/reference.html#sqlite-utils-utils-rows-from-file) to load the file."
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "[{'id': 1, 'name': 'Alice', 'age': 30}, {'id': 2, 'name': 'Bob', 'age': 25}, {'id': 3, 'name': 'Charlie', 'age': 35}]\n"
+     ]
+    }
+   ],
+   "source": [
+    "db = Database(\":memory:\")\n",
+    "csv_data = \"\"\"id,name,age\n",
+    "1,Alice,30\n",
+    "2,Bob,25\n",
+    "3,Charlie,35\"\"\"\n",
+    "\n",
+    "table = db.import_file(\"people\", csv_data)\n",
+    "print(table())\n",
+    "table.drop()"
+   ]
+  },
   {
    "cell_type": "markdown",
    "metadata": {},