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<div class="sect1">
<div class="titlepage"><div><div><h2 class="title" style="clear: both">
<a name="howto-exec-select"></a>Execute a SELECT command</h2></div></div></div>
<p>
      Any SQL command in <span class="application">Libgda</span> must be converted to a <a class="link" href="GdaStatement.html" title="GdaStatement">GdaStatement</a> object
      which is then executed; if the statement defines some variable (place holders), then variables binding
      (assigning values to variables) is done at execution time. Each database provider (database 
      <span class="emphasis"><em>driver</em></span> or <span class="emphasis"><em>adapter</em></span>) can implement its own parser to 
      be able to parse its specific SQL dialect. Except for binding variables, and for reusability, the
      <a class="link" href="GdaStatement.html" title="GdaStatement">GdaStatement</a> object guarantees that it contains only one SQL statement
      (it's not possible for it to contain several ones separated by a semicolon).
    </p>
<p>
      Parsing an SQL statement into a <a class="link" href="GdaStatement.html" title="GdaStatement">GdaStatement</a> object is the job of an
      SqlParser.
    </p>
<p>
      However when one only wants to run a simple SQL statement, <span class="application">Libgda</span> provides the
      gda_connection_statement_execute_select_command() function which does
      everything in one step. The following codes illustrates parsing and executing a SELECT statement:
    </p>
<p>
      </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, "SELECT * FROM customers", NULL, &amp;error);
g_object_unref (parser);
if (!stmt) {
    /* there was an error while parsing */
}
else {
    GdaDataModel *model;
    model = gda_connection_statement_execute_select (cnc, stmt, NULL, &amp;error);
    if (model) {
        /* dump to results to STDOUT */
        gda_data_model_dump (model, stdout);
        g_object_unref (model);
    }
    else {
        /* there was an error while executing the statement */
    }
}
g_object_unref (stmt);
      </pre>
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