From 4a73473a1e3a3eb7989085b73540f48750fc7cb5 Mon Sep 17 00:00:00 2001
From: Wojtek Mach <wojtek@wojtekmach.pl>
Date: Wed, 13 Aug 2025 11:57:40 +0200
Subject: [PATCH 1/2] Fix structure_load/2 for MySQL 9.4+

On MySQL 9.4+, `--execute "SOURCE {path}"` is no longer supported.
---
 lib/ecto/adapters/myxql.ex | 22 ++++++++++++----------
 1 file changed, 12 insertions(+), 10 deletions(-)

diff --git a/lib/ecto/adapters/myxql.ex b/lib/ecto/adapters/myxql.ex
index 45ef3fc28..b500df9b3 100644
--- a/lib/ecto/adapters/myxql.ex
+++ b/lib/ecto/adapters/myxql.ex
@@ -416,16 +416,18 @@ defmodule Ecto.Adapters.MyXQL do
   def structure_load(default, config) do
     path = config[:dump_path] || Path.join(default, "structure.sql")
 
-    args = [
-      "--execute",
-      "SET FOREIGN_KEY_CHECKS = 0; SOURCE #{path}; SET FOREIGN_KEY_CHECKS = 1",
-      "--database",
-      config[:database]
-    ]
-
-    case run_with_cmd("mysql", config, args) do
-      {_output, 0} -> {:ok, path}
-      {output, _} -> {:error, output}
+    with {:ok, contents} <- File.read(path) do
+      args = [
+        "--execute",
+        "SET FOREIGN_KEY_CHECKS = 0; " <> contents <> "; SET FOREIGN_KEY_CHECKS = 1",
+        "--database",
+        config[:database]
+      ]
+
+      case run_with_cmd("mysql", config, args) do
+        {_output, 0} -> {:ok, path}
+        {output, _} -> {:error, output}
+      end
     end
   end
 

From 799db88f2dd7dcb75a23568d6d38c8612c452df1 Mon Sep 17 00:00:00 2001
From: Wojtek Mach <wojtek@wojtekmach.pl>
Date: Wed, 13 Aug 2025 14:21:44 +0200
Subject: [PATCH 2/2] up

---
 lib/ecto/adapters/myxql.ex | 28 ++++++++++++++++------------
 1 file changed, 16 insertions(+), 12 deletions(-)

diff --git a/lib/ecto/adapters/myxql.ex b/lib/ecto/adapters/myxql.ex
index b500df9b3..dc595d066 100644
--- a/lib/ecto/adapters/myxql.ex
+++ b/lib/ecto/adapters/myxql.ex
@@ -416,18 +416,22 @@ defmodule Ecto.Adapters.MyXQL do
   def structure_load(default, config) do
     path = config[:dump_path] || Path.join(default, "structure.sql")
 
-    with {:ok, contents} <- File.read(path) do
-      args = [
-        "--execute",
-        "SET FOREIGN_KEY_CHECKS = 0; " <> contents <> "; SET FOREIGN_KEY_CHECKS = 1",
-        "--database",
-        config[:database]
-      ]
-
-      case run_with_cmd("mysql", config, args) do
-        {_output, 0} -> {:ok, path}
-        {output, _} -> {:error, output}
-      end
+    case File.read(path) do
+      {:ok, contents} ->
+        args = [
+          "--execute",
+          "SET FOREIGN_KEY_CHECKS = 0; " <> contents <> "; SET FOREIGN_KEY_CHECKS = 1",
+          "--database",
+          config[:database]
+        ]
+
+        case run_with_cmd("mysql", config, args) do
+          {_output, 0} -> {:ok, path}
+          {output, _} -> {:error, output}
+        end
+
+      {:error, reason} ->
+        {:error, "could not read #{inspect(path)}: #{:file.format_error(reason)}"}
     end
   end