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extern crate libsqlite3_sys as ffi; extern crate libc; extern crate byteorder; use self::byteorder::{ReadBytesExt, BigEndian}; use std::ffi::CString; use std::io::{stderr, Write}; use std::ptr; use sqlite::SqliteType; use result::*; use result::Error::{DatabaseError, QueryBuilderError}; use super::raw::RawConnection; use super::sqlite_value::SqliteRow; pub struct Statement { inner_statement: *mut ffi::sqlite3_stmt, bind_index: libc::c_int, } impl Statement { pub fn prepare(raw_connection: &RawConnection, sql: &str) -> QueryResult<Self> { let mut stmt = ptr::null_mut(); let mut unused_portion = ptr::null(); let prepare_result = unsafe { ffi::sqlite3_prepare_v2( raw_connection.internal_connection, try!(CString::new(sql)).as_ptr(), sql.len() as libc::c_int, &mut stmt, &mut unused_portion, ) }; ensure_sqlite_ok(prepare_result) .map(|_| Statement { inner_statement: stmt, bind_index: 0 }) } pub fn run(&self) -> QueryResult<()> { match unsafe { ffi::sqlite3_step(self.inner_statement) } { ffi::SQLITE_DONE | ffi::SQLITE_ROW => Ok(()), error => Err(DatabaseError(super::error_message(error).into())) } } pub fn bind(&mut self, tpe: SqliteType, value: Option<Vec<u8>>) -> QueryResult<()> { self.bind_index += 1; let result = unsafe { match (tpe, value) { (_, None) => ffi::sqlite3_bind_null(self.inner_statement, self.bind_index), (SqliteType::Binary, Some(bytes)) => ffi::sqlite3_bind_blob( self.inner_statement, self.bind_index, bytes.as_ptr() as *const libc::c_void, bytes.len() as libc::c_int, ffi::SQLITE_TRANSIENT(), ), (SqliteType::Text, Some(bytes)) => ffi::sqlite3_bind_text( self.inner_statement, self.bind_index, bytes.as_ptr() as *const libc::c_char, bytes.len() as libc::c_int, ffi::SQLITE_TRANSIENT(), ), (SqliteType::Float, Some(bytes)) => { let value = try!((&bytes[..]).read_f32::<BigEndian>() .map_err(|e| QueryBuilderError(Box::new(e)))); ffi::sqlite3_bind_double( self.inner_statement, self.bind_index, value as libc::c_double, ) } (SqliteType::Double, Some(bytes)) => { let value = try!((&bytes[..]).read_f64::<BigEndian>() .map_err(|e| QueryBuilderError(Box::new(e)))); ffi::sqlite3_bind_double( self.inner_statement, self.bind_index, value as libc::c_double, ) } (SqliteType::SmallInt, Some(bytes)) => { let value = try!((&bytes[..]).read_i16::<BigEndian>() .map_err(|e| QueryBuilderError(Box::new(e)))); ffi::sqlite3_bind_int( self.inner_statement, self.bind_index, value as libc::c_int, ) } (SqliteType::Integer, Some(bytes)) => { let value = try!((&bytes[..]).read_i32::<BigEndian>() .map_err(|e| QueryBuilderError(Box::new(e)))); ffi::sqlite3_bind_int( self.inner_statement, self.bind_index, value as libc::c_int, ) } (SqliteType::Long, Some(bytes)) => { let value = try!((&bytes[..]).read_i64::<BigEndian>() .map_err(|e| QueryBuilderError(Box::new(e)))); ffi::sqlite3_bind_int64( self.inner_statement, self.bind_index, value, ) } }}; ensure_sqlite_ok(result) } pub fn step(&mut self) -> Option<SqliteRow> { match unsafe { ffi::sqlite3_step(self.inner_statement) } { ffi::SQLITE_DONE => None, ffi::SQLITE_ROW => Some(SqliteRow::new(self.inner_statement)), error => panic!("{}", super::error_message(error)), } } fn reset(&mut self) -> QueryResult<()> { self.bind_index = 0; ensure_sqlite_ok(unsafe { ffi::sqlite3_reset(self.inner_statement) }) } } fn ensure_sqlite_ok(code: libc::c_int) -> QueryResult<()> { if code != ffi::SQLITE_OK { Err(DatabaseError(super::error_message(code).into())) } else { Ok(()) } } impl Drop for Statement { fn drop(&mut self) { use std::thread::panicking; let finalize_result = unsafe { ffi::sqlite3_finalize(self.inner_statement) }; if let Err(e) = ensure_sqlite_ok(finalize_result) { if panicking() { write!(stderr(), "Error finalizing SQLite prepared statement: {:?}", e).unwrap(); } else { panic!("Error finalizing SQLite prepared statement: {:?}", e); } } } } use std::cell::RefCell; use std::ops::Deref; use std::rc::Rc; #[derive(Clone)] pub struct StatementUse { statement: Rc<RefCell<Statement>>, } impl StatementUse { pub fn new(statement: Statement) -> Self { StatementUse { statement: Rc::new(RefCell::new(statement)), } } } impl Deref for StatementUse { type Target = RefCell<Statement>; fn deref(&self) -> &Self::Target { &*self.statement } } impl Drop for StatementUse { fn drop(&mut self) { use std::thread::panicking; let reset_result = self.statement.borrow_mut().reset(); if let Err(e) = reset_result { if panicking() { write!(stderr(), "Error resetting SQLite prepared statement: {:?}", e).unwrap(); } else { panic!("Error resetting SQLite prepared statement: {:?}", e); } } } }