如何从c扩展内部执行select语句

#include <stdio.h>
#include <stdlib.h>
#include <mysql/mysql.h>

int main() {
    MYSQL *conn;
    MYSQL_RES *res;
    MYSQL_ROW row;
    char *server = "localhost";
    char *user = "username";
    char *password = "password";
    char *database = "database_name";

    conn = mysql_init(NULL);
    
    // Connect to database
    if (!mysql_real_connect(conn, server, user, password, database, 0, NULL, 0)) {
        fprintf(stderr, "%s\n", mysql_error(conn));
        exit(1);
    }
    
    // Execute select statement
    if (mysql_query(conn, "SELECT * FROM table_name")) {
        fprintf(stderr, "%s\n", mysql_error(conn));
        exit(1);
    }
    
    // Get query result
    res = mysql_use_result(conn);
    
    // Fetch rows
    while ((row = mysql_fetch_row(res)) != NULL) {
        printf("%s\n", row[0]);
    }
    
    // Free result
    mysql_free_result(res);
    
    // Close connection
    mysql_close(conn);
    
    return 0;
}