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extern crate pq_sys; extern crate libc; use self::pq_sys::*; use std::ffi::{CString, CStr}; use std::{str, ptr}; use result::*; pub struct RawConnection { internal_connection: *mut PGconn, } impl RawConnection { pub fn establish(database_url: &str) -> ConnectionResult<Self> { let connection_string = try!(CString::new(database_url)); let connection_ptr = unsafe { PQconnectdb(connection_string.as_ptr()) }; let connection_status = unsafe { PQstatus(connection_ptr) }; match connection_status { CONNECTION_OK => { Ok(RawConnection { internal_connection: connection_ptr, }) } _ => { let message = last_error_message(connection_ptr); Err(ConnectionError::BadConnection(message)) } } } pub fn last_error_message(&self) -> String { last_error_message(self.internal_connection) } pub fn escape_identifier(&self, identifier: &str) -> QueryResult<PgString> { let result_ptr = unsafe { PQescapeIdentifier( self.internal_connection, identifier.as_ptr() as *const libc::c_char, identifier.len() as libc::size_t, ) }; if result_ptr.is_null() { Err(Error::DatabaseError(last_error_message(self.internal_connection))) } else { unsafe { Ok(PgString::new(result_ptr)) } } } pub fn set_notice_processor(&self, notice_processor: NoticeProcessor) { unsafe { PQsetNoticeProcessor(self.internal_connection, Some(notice_processor), ptr::null_mut()); } } pub unsafe fn exec(&self, query: *const libc::c_char) -> *mut PGresult { PQexec(self.internal_connection, query) } pub unsafe fn exec_params( &self, query: *const libc::c_char, param_count: libc::c_int, param_types: *const Oid, param_values: *const *const libc::c_char, param_lengths: *const libc::c_int, param_formats: *const libc::c_int, result_format: libc::c_int, ) -> *mut PGresult { PQexecParams( self.internal_connection, query, param_count, param_types, param_values, param_lengths, param_formats, result_format, ) } pub unsafe fn exec_prepared( &self, stmt_name: *const libc::c_char, param_count: libc::c_int, param_values: *const *const libc::c_char, param_lengths: *const libc::c_int, param_formats: *const libc::c_int, result_format: libc::c_int, ) -> *mut PGresult { PQexecPrepared( self.internal_connection, stmt_name, param_count, param_values, param_lengths, param_formats, result_format, ) } pub unsafe fn prepare( &self, stmt_name: *const libc::c_char, query: *const libc::c_char, param_count: libc::c_int, param_types: *const Oid, ) -> *mut PGresult { PQprepare( self.internal_connection, stmt_name, query, param_count, param_types, ) } } pub type NoticeProcessor = extern "C" fn(arg: *mut libc::c_void, message: *const libc::c_char); impl Drop for RawConnection { fn drop(&mut self) { unsafe { PQfinish(self.internal_connection) }; } } fn last_error_message(conn: *const PGconn) -> String { unsafe { let error_ptr = PQerrorMessage(conn); let bytes = CStr::from_ptr(error_ptr).to_bytes(); str::from_utf8_unchecked(bytes).to_string() } } pub struct PgString { pg_str: *mut libc::c_char, } impl PgString { unsafe fn new(ptr: *mut libc::c_char) -> Self { PgString { pg_str: ptr, } } } impl ::std::ops::Deref for PgString { type Target = str; fn deref(&self) -> &str { unsafe { let c_string = CStr::from_ptr(self.pg_str); str::from_utf8_unchecked(c_string.to_bytes()) } } } impl Drop for PgString { fn drop(&mut self) { unsafe { PQfreemem(self.pg_str as *mut libc::c_void) } } }