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/*
* Copyright (C) 2009 - 2011 Vivien Malerba <malerba@gnome-db.org>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include <libgda/libgda.h>
#include <sql-parser/gda-sql-parser.h>
GdaSqlParser *parser;
GdaConnection *open_connection (void);
void display_customers (GdaConnection *cnc);
void run_sql_non_select (GdaConnection *cnc, const gchar *sql);
int
main (int argc, char *argv[])
{
gda_init ();
GdaConnection *cnc;
GError *error = NULL;
GdaStatement *stmt;
GdaDataModel *model;
gchar *str;
GValue *name;
/* open connection */
cnc = open_connection ();
/* begin transaction */
if (! gda_connection_begin_transaction (cnc, NULL, GDA_TRANSACTION_ISOLATION_UNKNOWN,
&error)) {
g_print ("Could not begin transaction: %s\n",
error && error->message ? error->message : "No detail");
exit (1);
}
/* execute SELECT */
stmt = gda_sql_parser_parse_string (parser, "SELECT id, name FROM customers ORDER BY id", NULL, NULL);
g_assert (stmt);
model = gda_connection_statement_execute_select (cnc, stmt, NULL, &error);
g_object_unref (stmt);
if (!model) {
g_print ("Could not execute SELECT statement: %s\n",
error && error->message ? error->message : "No detail");
exit (1);
}
g_print ("** Data model is:\n");
gda_data_model_dump (model, stdout);
/*
* make sure the mete data is up to date
*/
g_print ("Computing meta data, this may take a while; in real applications, this should be cached to avoid waiting\n");
if (! gda_connection_update_meta_store (cnc, NULL, &error)) {
g_print ("Could not fetch meta data: %s\n",
error && error->message ? error->message : "No detail");
exit (1);
}
/*
* Make the data model compute the modification statements which
* will actually be executed when the data model is modified
*/
if (! gda_data_select_compute_modification_statements (GDA_DATA_SELECT (model), &error)) {
g_print ("Could not compute modification statements: %s\n",
error && error->message ? error->message : "No detail");
exit (1);
}
g_object_get (G_OBJECT (model), "update-stmt", &stmt, NULL);
str = gda_statement_to_sql (stmt, NULL, NULL);
g_print ("Computed UPDATE: %s\n", str);
g_free (str);
g_object_unref (stmt);
g_object_get (G_OBJECT (model), "delete-stmt", &stmt, NULL);
str = gda_statement_to_sql (stmt, NULL, NULL);
g_print ("Computed DELETE: %s\n", str);
g_free (str);
g_object_unref (stmt);
g_object_get (G_OBJECT (model), "insert-stmt", &stmt, NULL);
str = gda_statement_to_sql (stmt, NULL, NULL);
g_print ("Computed INSERT: %s\n", str);
g_free (str);
g_object_unref (stmt);
/*
* remove row 0 (1st row)
*/
g_print ("\n\n** Removing row 0\n");
if (! gda_data_model_remove_row (model, 0, &error)) {
g_print ("Could not remove row 0: %s\n",
error && error->message ? error->message : "No detail");
exit (1);
}
g_print ("** Data model is now:\n");
gda_data_model_dump (model, stdout);
g_print ("** Table's contents is now:\n");
display_customers (cnc);
/*
* add a row: the row's values is a list of GValue pointers
* (or NULL pointers where the default value should be inserted
*/
GList *list;
g_print ("\n\n** Adding a row\n");
list = g_list_append (NULL, NULL);
g_value_set_string ((name = gda_value_new (G_TYPE_STRING)), "Hiro");
list = g_list_append (list, name);
if (gda_data_model_append_values (model, list, &error) == -1) {
g_print ("Could not add a row: %s\n",
error && error->message ? error->message : "No detail");
exit (1);
}
gda_value_free (name);
g_list_free (list);
g_print ("** Data model is now:\n");
gda_data_model_dump (model, stdout);
g_print ("** Table's contents is now:\n");
display_customers (cnc);
/*
* alter row 2
*/
g_print ("\n\n** Modifying row 2\n");
g_value_set_string ((name = gda_value_new (G_TYPE_STRING)), "Tom");
if (! gda_data_model_set_value_at (model, 1, 2, name, &error)) {
g_print ("Could not modify row 2: %s\n",
error && error->message ? error->message : "No detail");
exit (1);
}
gda_value_free (name);
g_print ("** Data model is now:\n");
gda_data_model_dump (model, stdout);
g_print ("** Table's contents is now:\n");
display_customers (cnc);
/* rollback transaction */
gda_connection_rollback_transaction (cnc, NULL, NULL);
gda_connection_close (cnc);
return 0;
}
/*
* Open a connection to the example.db file
*/
GdaConnection *
open_connection ()
{
GdaConnection *cnc;
GError *error = NULL;
/* open connection */
cnc = gda_connection_open_from_dsn ("SalesTest", NULL,
GDA_CONNECTION_OPTIONS_NONE,
&error);
if (!cnc) {
g_print ("Could not open connection: %s\n",
error && error->message ? error->message : "No detail");
exit (1);
}
/* create an SQL parser */
parser = gda_connection_create_parser (cnc);
if (!parser) /* @cnc does not provide its own parser => use default one */
parser = gda_sql_parser_new ();
/* attach the parser object to the connection */
g_object_set_data_full (G_OBJECT (cnc), "parser", parser, g_object_unref);
return cnc;
}
/*
* display the contents of the 'products' table
*/
void
display_customers (GdaConnection *cnc)
{
GdaDataModel *data_model;
GdaSqlParser *parser;
GdaStatement *stmt;
gchar *sql = "SELECT id, name FROM customers ORDER BY id";
GError *error = NULL;
parser = g_object_get_data (G_OBJECT (cnc), "parser");
stmt = gda_sql_parser_parse_string (parser, sql, NULL, NULL);
data_model = gda_connection_statement_execute_select (cnc, stmt, NULL, &error);
g_object_unref (stmt);
if (!data_model)
g_error ("Could not get the contents of the 'products' table: %s\n",
error && error->message ? error->message : "No detail");
gda_data_model_dump (data_model, stdout);
g_object_unref (data_model);
}
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