Update sqlx-oldapi to fix MSSQL NULL parameters

CHANGELOG.md

@@ -1,6 +1,7 @@
 # CHANGELOG.md
 
 ## v0.47.0 (unreleased)
+- Updated sqlx-oldapi to v0.6.57 to fix SQL Server fallback expressions such as `ISNULL($missing, 'default')` truncating defaults or failing for date values when the bound variable is `NULL`.
 - Fixed MSSQL `JSON_OBJECT('key': value)` expressions being rejected by SQLPage's parser, including when used in `SET` statements or nested in `sqlpage.*` function calls.
 - OIDC now checks both normalized request paths and their resolved SQL files against protected prefixes, closing authentication bypasses through path and clean-URL aliases. Nonce verification also rejects provider-returned Argon2 parameters outside SQLPage's fixed low-cost profile before hashing.
 - `cargo install sqlpage`, and any build from the crates.io tarball, no longer needs internet access. The browser libraries now come from npm and ship inside the published crate. Building from a git checkout needs `npm ci` first. Pre-built binaries and the Docker image are unaffected.

Cargo.toml

@@ -37,7 +37,7 @@ panic = "abort"
 codegen-units = 2
 
 [dependencies]
-sqlx = { package = "sqlx-core-oldapi", version = "0.6.56", default-features = false, features = [
+sqlx = { package = "sqlx-core-oldapi", version = "0.6.57", default-features = false, features = [
     "any",
     "runtime-tokio-rustls",
     "migrate",

tests/sql_test_files/data/database-specific/mssql/null_variable_fallback.sql

@@ -0,0 +1,8 @@
+SELECT
+    CONCAT(
+        'isnull=[', ISNULL($missing, 'hello'),
+        '] coalesce=[', COALESCE($missing, 'hello'),
+        '] len=', LEN(ISNULL($missing, 'hello')),
+        '; date_is_date=', ISDATE(ISNULL($missing_date, GETDATE()))
+    ) AS actual,
+    'isnull=[hello] coalesce=[hello] len=5; date_is_date=1' AS expected;