Merge pull request #18 from SpringQL/feat/better-error

feat: more informative error

Author: laysakura

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "springql-client-c"
-version = "0.3.1"
+version = "0.3.1+2"
 
 authors = ["Sho Nakatani <lay.sakura@gmail.com>"]
 license = "MIT OR Apache-2.0"

README.md

@@ -25,6 +25,14 @@ All you need to do are:
 
 See [`c_example/`](https://github.com/SpringQL/SpringQL-client-c/tree/main/c_example) for how to write and build a SpringQL embedded application.
 
+## Versioning
+
+[Semantic versioning](https://semver.org/) in `<major>.<minor>.<patch>(\+<build>)?` format.
+
+`<major>.<minor>.<patch>` is exactly the same as the version of `springql-core` crate.
+
+`<build>` is an incremental number. `N`th build (`N > 1`) for the `springql-core vX.Y.Z` is `vX.Y.Z+N`, for example.
+
 ## Development
 
 ### Build

src/spring_last_err.rs

@@ -8,7 +8,7 @@ use std::{
     os::raw::{c_char, c_int},
 };
 
-use log::{error, warn};
+use log::{info, warn};
 use springql_core::error::SpringError;
 
 use crate::{cstr::strcpy, spring_errno::SpringErrno};
@@ -38,7 +38,7 @@ impl Error for LastError {
 impl Display for LastError {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         let s = match self {
-            LastError::SpringErr(e) => format!("{}", e),
+            LastError::SpringErr(e) => format!("{:?}", e),
             LastError::UnwindErr(any) => {
                 if let Some(s) = any.downcast_ref::<String>() {
                     s.clone()
@@ -55,7 +55,7 @@ impl Display for LastError {
 
 /// Update the most recent error, clearing whatever may have been there before.
 pub(super) fn update_last_error(err: LastError) {
-    error!("Setting LAST_ERROR: {}", err);
+    info!("Setting LAST_ERROR: {}", err);
 
     {
         // Print a pseudo-backtrace for this error, following back each error's