[Database] Fix multi-statement error reporting (#3425)

common/database/database_update.cpp

@@ -183,7 +183,7 @@ bool DatabaseUpdate::UpdateManifest(
 
 					// ignore empty query result "errors"
 					if (r.ErrorNumber() != 1065 && !r.ErrorMessage().empty()) {
-						LogError("[{}]", r.ErrorMessage());
+						LogError("(#{}) [{}]", r.ErrorNumber(), r.ErrorMessage());
 						errored_migration = true;
 
 						LogInfo("Required database update failed. This could be a problem");

common/dbcore.cpp

@@ -323,8 +323,11 @@ MySQLRequestResult DBcore::QueryDatabaseMulti(const std::string &query)
 	if (pStatus != Connected) {
 		Open();
 	}
+	auto r = MySQLRequestResult{};
 
 	int status = mysql_real_query(mysql, query.c_str(), query.length());
+
+	// process single result
 	if (status != 0) {
 		unsigned int error_number = mysql_errno(mysql);
 
@@ -337,11 +340,35 @@ MySQLRequestResult DBcore::QueryDatabaseMulti(const std::string &query)
 			std::string error_raw   = fmt::format("{}", mysql_error(mysql));
 			std::string mysql_err   = Strings::Trim(error_raw);
 			std::string clean_query = Strings::Replace(query, "\n", "");
-			LogMySQLQuery("[{}] ({}) query [{}]", mysql_err, mysql_errno(mysql), clean_query);
+			LogMySQLError("[{}] ({}) query [{}]", mysql_err, mysql_errno(mysql), clean_query);
+
+			MYSQL_RES *res = mysql_store_result(mysql);
+
+			uint32 row_count = 0;
+			if (res) {
+				row_count = (uint32) mysql_num_rows(res);
+			}
+
+			r = MySQLRequestResult(
+				res,
+				(uint32) mysql_affected_rows(mysql),
+				row_count,
+				(uint32) mysql_field_count(mysql),
+				(uint32) mysql_insert_id(mysql)
+			);
+
+			std::string error_message = mysql_error(mysql);
+			r.SetErrorMessage(error_message);
+			r.SetErrorNumber(mysql_errno(mysql));
+
+			if (res) {
+				mysql_free_result(res);
+			}
+
+			return r;
 		}
 	}
 
-	auto result = MySQLRequestResult{};
 
 	int index = 0;
 
@@ -355,7 +382,7 @@ MySQLRequestResult DBcore::QueryDatabaseMulti(const std::string &query)
 		uint32    row_count = 0;
 		MYSQL_RES *res      = mysql_store_result(mysql);
 
-		result = MySQLRequestResult(
+		r = MySQLRequestResult(
 			res,
 			(uint32) mysql_affected_rows(mysql),
 			row_count,
@@ -368,15 +395,14 @@ MySQLRequestResult DBcore::QueryDatabaseMulti(const std::string &query)
 			LogMySQLQuery(
 				"{} -- ({} row{} affected) ({}s)",
 				piece,
-				result.RowsAffected(),
+				r.RowsAffected(),
-				result.RowsAffected() == 1 ? "" : "s",
+				r.RowsAffected() == 1 ? "" : "s",
 				std::to_string(timer.elapsed())
 			);
 		}
 
 		if (res) {
 			row_count = (uint32) mysql_num_rows(res);
-			mysql_free_result(res);
 		}
 
 		// more results? -1 = no, >0 = error, 0 = yes (keep looping)
@@ -385,13 +411,25 @@ MySQLRequestResult DBcore::QueryDatabaseMulti(const std::string &query)
 				LogMySQLError("[{}] [{}]", mysql_errno(mysql), mysql_error(mysql));
 			}
 
+			mysql_free_result(res);
+
+			// error logging
+			std::string error_message = mysql_error(mysql);
+			r.SetErrorMessage(error_message);
+			r.SetErrorNumber(mysql_errno(mysql));
+
 			// we handle errors elsewhere
-			return result;
+			return r;
 		}
+
+		if (res) {
+			mysql_free_result(res);
+		}
+
 		index++;
 	} while (status == 0);
 
 	SetMultiStatementsOff();
 
-	return result;
+	return r;
 }

common/mysql_request_result.cpp

@@ -51,6 +51,7 @@ void MySQLRequestResult::ZeroOut()
 	m_RowCount = 0;
 	m_RowsAffected = 0;
 	m_LastInsertedID = 0;
+	m_error_message = "";
 }
 
 MySQLRequestResult::~MySQLRequestResult()
@@ -137,3 +138,23 @@ MySQLRequestResult& MySQLRequestResult::operator=(MySQLRequestResult&& other)
 	other.ZeroOut();
 	return *this;
 }
+
+uint32 MySQLRequestResult::GetErrorNumber() const
+{
+	return m_ErrorNumber;
+}
+
+void MySQLRequestResult::SetErrorNumber(uint32 m_error_number)
+{
+	m_ErrorNumber = m_error_number;
+}
+
+const std::string &MySQLRequestResult::GetErrorMessage() const
+{
+	return m_error_message;
+}
+
+void MySQLRequestResult::SetErrorMessage(const std::string &m_error_message)
+{
+	MySQLRequestResult::m_error_message = m_error_message;
+}

common/mysql_request_result.h

@@ -33,6 +33,7 @@ private:
 	uint32 m_LastInsertedID;
 	uint32 m_ErrorNumber;
 
+	std::string m_error_message;
 
 public:
 
@@ -44,7 +45,13 @@ public:
 	MySQLRequestResult& operator=(MySQLRequestResult&& other);
 
 	bool Success() const { return m_Success;}
-	std::string ErrorMessage() const {return m_ErrorBuffer ? std::string(m_ErrorBuffer) : std::string("");}
+	std::string ErrorMessage() const {
+		if (!m_error_message.empty()) {
+			return m_error_message;
+		}
+
+		return m_ErrorBuffer ? std::string(m_ErrorBuffer) : std::string("");
+	}
 	uint32 ErrorNumber() const {return m_ErrorNumber;}
 	uint32 RowsAffected() const {return m_RowsAffected;}
 	uint32 RowCount() const {return m_RowCount;}
@@ -57,6 +64,11 @@ public:
 	MySQLRequestRow& begin() { return m_CurrentRow; }
 	MySQLRequestRow& end() { return m_OneBeyondRow; }
 
+	uint32 GetErrorNumber() const;
+	void SetErrorNumber(uint32 m_error_number);
+	const std::string &GetErrorMessage() const;
+	void SetErrorMessage(const std::string &m_error_message);
+
 private:
 	void FreeInternals();
 	void ZeroOut();