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

[Daniel Espinosa Ortiz <despinosa src gnome org>]

commit 02d5b22a22dbd50a9f8d8e6a3615d7acefa4d89e
Author: Daniel Espinosa <esodan gmail com>
Date:   Sat Jan 30 19:39:53 2021 -0600

    Revert "test: Using standard method to get a value as a string"
    
    This reverts commit e14eed06e38d7f36b77760ae90976934a8380f3f.

 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 7b3bf5e2d..d84c9682a 100644
--- a/tests/providers/prov-test-common.c
+++ b/tests/providers/prov-test-common.c
@@ -1063,7 +1063,7 @@ 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 CAST(ts AS TEXT) FROM tstest", NULL, &error); /* 
retreive timestamp as string */
+       stmt = gda_sql_parser_parse_string (parser, "SELECT ts || 'asstring' FROM tstest", NULL, &error); /* 
retreive timestamp as string */
        if (!stmt) {
                g_free (str);
                number_failed ++;
@@ -1224,7 +1224,7 @@ 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 CAST(thedate AS TEXT) FROM datetest", NULL, 
&error); /* retreive date as string */
+       stmt = gda_sql_parser_parse_string (parser, "SELECT thedate || 'asstring' FROM datetest", NULL, 
&error); /* retreive date as string */
        if (!stmt) {
                g_free (str);
                number_failed ++;