fix decoding of the sql DECIMAL type: integers and floats are now handled separately

we used to decode all decimals as floats

Author: lovasoa

Cargo.lock

@@ -28,6 +28,7 @@ sqlx = { package = "sqlx-oldapi", git = "https://github.com/sqlpage/sqlx-oldapi"
     "mssql",
     "odbc",
     "chrono",
+    "bigdecimal",
     "json",
     "uuid",
 ] }
@@ -52,6 +53,7 @@ sqlparser = { version = "0.59.0", default-features = false, features = [
 async-stream = "0.3"
 async-trait = "0.1.61"
 async-recursion = "1.0.0"
+bigdecimal = "0.4.8"
 include_dir = "0.7.2"
 config = { version = "0.15.4", features = ["json"] }
 markdown = { version = "1.0.0-alpha.23", features = ["log"] }

Cargo.toml

@@ -1,5 +1,6 @@
 use crate::utils::add_value_to_map;
 use crate::webserver::database::blob_to_data_url;
+use bigdecimal::{BigDecimal, ToPrimitive};
 use chrono::{DateTime, FixedOffset, NaiveDateTime};
 use serde_json::{self, Map, Value};
 use sqlx::any::{AnyRow, AnyTypeInfo, AnyTypeInfoKind};
@@ -61,8 +62,18 @@ pub fn sql_nonnull_to_json<'r>(mut get_ref: impl FnMut() -> sqlx::any::AnyValueR
     log::trace!("Decoding a value of type {type_name:?} (type info: {type_info:?})");
     let AnyTypeInfo(ref db_type) = *type_info;
     match type_name {
-        "REAL" | "FLOAT" | "FLOAT4" | "FLOAT8" | "DOUBLE" | "NUMERIC" | "DECIMAL" => {
-            decode_raw::<f64>(raw_value).into()
+        "REAL" | "FLOAT" | "FLOAT4" | "FLOAT8" | "DOUBLE" => decode_raw::<f64>(raw_value).into(),
+        "NUMERIC" | "DECIMAL" => {
+            let decimal = decode_raw::<BigDecimal>(raw_value);
+            if decimal.is_integer() {
+                if let Some(int) = decimal.to_i64() {
+                    return int.into();
+                }
+            }
+            if let Some(float) = decimal.to_f64() {
+                return float.into();
+            }
+            decimal.to_string().into()
         }
         "INT8" | "BIGINT" | "SERIAL8" | "BIGSERIAL" | "IDENTITY" | "INT64" | "INTEGER8"
         | "BIGINT SIGNED" => decode_raw::<i64>(raw_value).into(),