extern crate pq_sys;
extern crate libc;
use connection::Connection;
use result::{Error, QueryResult};
use row::DbRow;
use self::pq_sys::*;
use std::ffi::CStr;
use std::{str, slice, mem};
pub struct DbResult {
internal_result: *mut PGresult,
}
impl DbResult {
pub fn new(conn: &Connection, internal_result: *mut PGresult) -> QueryResult<Self> {
let result_status = unsafe { PQresultStatus(internal_result) };
match result_status {
PGRES_COMMAND_OK | PGRES_TUPLES_OK => {
Ok(DbResult {
internal_result: internal_result,
})
},
_ => Err(Error::DatabaseError(conn.last_error_message())),
}
}
pub fn rows_affected(&self) -> usize {
unsafe {
let count_char_ptr = PQcmdTuples(self.internal_result);
let count_bytes = CStr::from_ptr(count_char_ptr).to_bytes();
let count_str = str::from_utf8_unchecked(count_bytes);
match count_str {
"" => 0,
_ => count_str.parse().unwrap()
}
}
}
pub fn num_rows(&self) -> usize {
unsafe { PQntuples(self.internal_result) as usize }
}
pub fn get_row(&self, idx: usize) -> DbRow {
DbRow::new(self, idx)
}
pub fn get(&self, row_idx: usize, col_idx: usize) -> Option<&[u8]> {
if self.is_null(row_idx, col_idx) {
None
} else {
let row_idx = row_idx as libc::c_int;
let col_idx = col_idx as libc::c_int;
unsafe {
let value_ptr = PQgetvalue(self.internal_result, row_idx, col_idx);
let value_ptr = mem::transmute::<_, *const u8>(value_ptr);
let num_bytes = PQgetlength(self.internal_result, row_idx, col_idx);
Some(slice::from_raw_parts(value_ptr, num_bytes as usize))
}
}
}
pub fn is_null(&self, row_idx: usize, col_idx: usize) -> bool {
unsafe {
0 != PQgetisnull(
self.internal_result,
row_idx as libc::c_int,
col_idx as libc::c_int,
)
}
}
}
impl Drop for DbResult {
fn drop(&mut self) {
unsafe { PQclear(self.internal_result) };
}
}