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<title>Execute an INSERT, UPDATE or DELETE command: GNOME Data Access 5 manual</title>
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<div class="sect1">
<div class="titlepage"><div><div><h2 class="title" style="clear: both">
<a name="howto-exec-non-select"></a>Execute an INSERT, UPDATE or DELETE command</h2></div></div></div>
<p>
INSERT, UPDATE or DELETE are treated in the same way as the SELECT command (see the
<a class="link" href="howto-exec-select.html" title="Execute a SELECT command">HOWTO</a> about executing
a SELECT command), except that the function to execute the command is different because the returned value
is not a data model but a success/failure value.
</p>
<p>
The following codes illustrates parsing and executing an UPDATE statement:
</p>
<pre class="programlisting">
GdaSqlParser *parser;
GdaStatement *stmt;
GError *error = NULL;
parser = gda_connection_create_parser (cnc);
if (!parser) {
/* the database provider used by cnc does not implement its own parser,
* let's use a generic one */
parser = gda_sql_parser_new ();
stmt = gda_sql_parser_parse_string (parser, "UPDATE customers set name='Joe' WHERE id=123", NULL, &error);
g_object_unref (parser);
if (!stmt) {
/* there was an error while parsing */
}
else {
gint res;
res = gda_connection_statement_execute_non_select (cnc, stmt, NULL, NULL, &error);
if (res == -1) {
/* there was an error while executing the statement */
}
else if (res >= 0)
g_print ("Command Ok, %d row(s) impacted\n", res);
else
g_print ("Command Ok, number of rows impacted is not reported\n");
}
g_object_unref (stmt);
</pre>
<p>
</p>
<p>
Note that the example above includes in the SQL statement the values of the data to use in the UPDATE
(namely 'Joe' and '123'). Even though it's simple, a better practice is to use variables, as it
prevents SQL injection and avoids formatting problems. For more intormation, see the
<a class="link" href="GdaSqlParser.html#GdaSqlParser.description" title="Description">GdaSqlParser</a> object's documentation; or the section
about convenience functions
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