Add hydration tests for the ODB ORM. Apparently it works.

tests/odb-orm/pgsql_orm_test.cpp

@@ -0,0 +1,62 @@
+#include <odb/pgsql/database.hxx>
+#include <odb/result.hxx>
+#include <odb/pgsql/transaction.hxx>
+#include <libpq-fe.h>
+
+#include "Agent-odb.hxx"
+#include "orm_test_common.h"
+
+namespace {
+
+void exec_pgsql(PGconn* conn, const std::string& sql)
+{
+  PGresult* result = PQexec(conn, sql.c_str());
+  if(result == nullptr)
+  {
+    throw std::runtime_error("PQexec returned null");
+  }
+
+  const ExecStatusType status = PQresultStatus(result);
+  if(status != PGRES_COMMAND_OK && status != PGRES_TUPLES_OK)
+  {
+    const std::string message = PQerrorMessage(conn);
+    PQclear(result);
+    throw std::runtime_error(message);
+  }
+
+  PQclear(result);
+}
+
+void apply_pgsql_ddl(const std::string& connstr)
+{
+  PGconn* conn = PQconnectdb(connstr.c_str());
+  if(PQstatus(conn) != CONNECTION_OK)
+  {
+    const std::string message = PQerrorMessage(conn);
+    PQfinish(conn);
+    throw std::runtime_error(message);
+  }
+
+  exec_pgsql(conn, "DROP TABLE IF EXISTS \"TripAttemptResult\" CASCADE;");
+  exec_pgsql(conn, "DROP TABLE IF EXISTS \"GovernmentAddress\" CASCADE;");
+  exec_pgsql(conn, "DROP TABLE IF EXISTS \"Agent\" CASCADE;");
+
+  for(const auto& sql_file : cppbessot_sql_files())
+  {
+    exec_pgsql(conn, cppbessot_read_text_file(sql_file));
+  }
+
+  PQfinish(conn);
+}
+
+} // namespace
+
+TEST(PgsqlOdbOrm, PersistsLoadsQueriesAndErases)
+{
+  const std::string connstr = cppbessot_env_or_default(
+    "CPPBESSOT_ODB_TEST_PGSQL_CONNSTR",
+    CPPBESSOT_ODB_TEST_PGSQL_CONNSTR_DEFAULT);
+  apply_pgsql_ddl(connstr);
+  odb::pgsql::database db(connstr);
+  cppbessot_run_agent_orm_roundtrip<odb::pgsql::database, odb::pgsql::transaction>(db);
+}