added implementation of get_affected_rows to the db2 backend

src/backends/db2/statement.cpp

@@ -191,8 +191,19 @@ db2_statement_backend::fetch(int  number )
 
 long long db2_statement_backend::get_affected_rows()
 {
-    // ...
-    return -1;
+    SQLLEN rows;
+
+    SQLRETURN cliRC = SQLRowCount(hStmt, &rows);
+    if (cliRC != SQL_SUCCESS && cliRC != SQL_SUCCESS_WITH_INFO)
+    {
+        throw db2_soci_error(db2_soci_error::sqlState("Error while getting affected row count", SQL_HANDLE_STMT, hStmt), cliRC);
+    }
+    else if (rows == -1)
+    {
+        throw soci_error("Error getting affected row count: statement did not perform an update, insert, delete, or merge"); 
+    }
+
+    return rows;
 }
 
 int db2_statement_backend::get_number_of_rows()

src/backends/db2/test/test-db2.cpp

@@ -54,6 +54,15 @@ struct table_creator_three : public table_creator_base
     }
 };
 
+struct table_creator_for_get_affected_rows : table_creator_base
+{
+    table_creator_for_get_affected_rows(session & sql)
+        : table_creator_base(sql)
+    {
+        sql << "CREATE TABLE SOCI_TEST(VAL INTEGER)";
+    }
+};
+
 class test_context :public test_context_base
 {
 public:
@@ -78,6 +87,11 @@ class test_context :public test_context_base
         return new table_creator_three(pr_s);
     }
 
+    table_creator_base* table_creator_4(session& s) const
+    {
+        return new table_creator_for_get_affected_rows(s);
+    }
+
     std::string to_date_time(std::string const & pi_datdt_string) const
     {
         return "to_date('" + pi_datdt_string + "', 'YYYY-MM-DD HH24:MI:SS')";