[libgda] test: Using standard method to get a value as a string

[Daniel Espinosa Ortiz <despinosa src gnome org>]

commit 36d5fd6541df272eb8b56410c334f83a4558c446
Author: Pavlo Solntsev <p sun fun gmail com>
Date:   Thu Jun 18 23:24:24 2020 -0500

    test: Using standard method to get a value as a string

 tests/providers/prov-test-common.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/tests/providers/prov-test-common.c b/tests/providers/prov-test-common.c
index cc47e4345..35f0db09a 100644
--- a/tests/providers/prov-test-common.c
+++ b/tests/providers/prov-test-common.c
@@ -1064,7 +1064,7 @@ prov_test_common_check_timestamp (void)
        str = gda_data_handler_get_str_from_value (dh, cvalue);
        g_object_unref (model);
 
-       stmt = gda_sql_parser_parse_string (parser, "SELECT ts || 'asstring' FROM tstest", NULL, &error); /* 
retreive timestamp as string */
+       stmt = gda_sql_parser_parse_string (parser, "SELECT CAST(ts AS TEXT) FROM tstest", NULL, &error); /* 
retreive timestamp as string */
        if (!stmt) {
                g_free (str);
                number_failed ++;
@@ -1225,7 +1225,7 @@ prov_test_common_check_date (void)
        str = gda_data_handler_get_str_from_value (dh, cvalue);
        g_object_unref (model);
 
-       stmt = gda_sql_parser_parse_string (parser, "SELECT thedate || 'asstring' FROM datetest", NULL, 
&error); /* retreive date as string */
+       stmt = gda_sql_parser_parse_string (parser, "SELECT CAST(thedate AS TEXT) FROM datetest", NULL, 
&error); /* retreive date as string */
        if (!stmt) {
                g_free (str);
                number_failed ++;