mirror of
https://github.com/isar/rusqlite.git
synced 2024-11-23 00:39:20 +08:00
First, try to implement a simple virtual table.
This commit is contained in:
gwenn
parent
5b62e2dd5f
commit
2d6705b03e
@ -155,6 +155,26 @@ impl ToResult for Null {
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}
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}
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/// Error indicating that a memory allocation failed.
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#[derive(Copy,Clone)]
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pub struct NoMem;
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impl ToResult for NoMem {
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unsafe fn set_result(&self, ctx: *mut sqlite3_context) {
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ffi::sqlite3_result_error_nomem(ctx)
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}
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}
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/// Error indicating that a string or BLOB is too long to represent.
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#[derive(Copy,Clone)]
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pub struct TooBig;
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impl ToResult for TooBig {
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unsafe fn set_result(&self, ctx: *mut sqlite3_context) {
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ffi::sqlite3_result_error_toobig(ctx)
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}
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}
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/// A trait for types that can be created from a SQLite function parameter value.
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pub trait FromValue: Sized {
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unsafe fn parameter_value(v: *mut sqlite3_value) -> Result<Self>;
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475
src/vtab.rs
475
src/vtab.rs
@ -1,71 +1,54 @@
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//! Create virtual tables.
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//! (See http://sqlite.org/vtab.html)
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use std::default::Default;
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use std::error::Error as StdError;
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use std::ffi::CString;
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use std::mem;
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use std::ptr;
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use libc::c_void;
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use libc;
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use {Connection, Result, InnerConnection, str_to_cstring};
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use functions::ToResult;
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use {Connection, Error, Result, InnerConnection, str_to_cstring};
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use error::error_from_sqlite_code;
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use ffi;
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use functions::{ToResult, NoMem, TooBig};
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/// Virtual table module.
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/// (See http://sqlite.org/c3ref/module.html)
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// (partial/minimal implementation)
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pub trait Module: Drop {
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type V: VTab;
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/// http://sqlite.org/vtab.html#xconnect
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fn connect(conn: &Connection, args: &[&str]) -> Result<Self::V>; // xcreate() == xconnect()
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// drop() = destroy (http://sqlite.org/c3ref/create_module.html)
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}
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/// VTab describes a particular instance of a virtual table.
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/// (See http://sqlite.org/c3ref/vtab.html)
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// (partial/minimal implementation)
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pub trait VTab: Drop {
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type C: Cursor;
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/// http://sqlite.org/vtab.html#xopen
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fn open(&self) -> Result<Self::C>;
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/// http://sqlite.org/vtab.html#xbestindex
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fn best_index(&self) -> Result<()> {
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// TODO sqlite3_index_info*
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Ok(())
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}
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// drop() = xdisconnect == xDestroy (http://sqlite.org/vtab.html#xdisconnect)
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}
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/// Cursor that points into the virtual table and is used to loop through the virtual table.
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/// (See http://sqlite.org/c3ref/vtab_cursor.html)
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pub trait Cursor: Drop {
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/// http://sqlite.org/vtab.html#xfilter
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fn filter(&self) -> Result<()>; // TODO int idxNum, const char *idxStr, int argc, sqlite3_value **argv
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/// http://sqlite.org/vtab.html#xnext
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fn next(&self) -> Result<()>;
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/// http://sqlite.org/vtab.html#xeof
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fn eof(&self) -> bool;
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/// http://sqlite.org/vtab.html#xcolumn
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fn column<T: ToResult + Sized>(&self, col: i32) -> Result<T>;
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/// http://sqlite.org/vtab.html#xrowid
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fn rowid(&self) -> i64; // TODO vs Result<i64>
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// drop() == http://sqlite.org/vtab.html#xclose
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}
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// let conn: Connection = ...;
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// let mod: Module = ...; // VTab builder
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// conn.create_module("module", mod);
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//
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// conn.execute("CREATE VIRTUAL TABLE foo USING module(...)");
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// \-> Module::xcreate
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// |-> let vtab: VTab = ...; // on the heap
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// \-> conn.declare_vtab("CREATE TABLE foo (...)");
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// conn = Connection::open(...);
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// \-> Module::xconnect
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// |-> let vtab: VTab = ...; // on the heap
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// \-> conn.declare_vtab("CREATE TABLE foo (...)");
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//
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// conn.close();
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// \-> vtab.xdisconnect
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// conn.execute("DROP TABLE foo");
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// \-> vtab.xDestroy
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//
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// let stmt = conn.prepare("SELECT ... FROM foo WHERE ...");
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// \-> vtab.xbestindex
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// stmt.quey().next();
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// \-> vtab.xopen
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// |-> let cursor: Cursor = ...; // on the heap
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// |-> cursor.xfilter or xnext
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// |-> cursor.xeof
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// \-> if not eof { cursor.column or xrowid } else { cursor.xclose }
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//
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impl Connection {
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/// Register a virtual table implementation.
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pub fn create_module<M>(&self, module_name: &str, module: M) -> Result<()>
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where M: Module
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{
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pub fn create_module<A>(&self,
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module_name: &str,
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module: *const ffi::sqlite3_module,
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aux: A)
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-> Result<()> {
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self.db
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.borrow_mut()
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.create_module(module_name, module)
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}
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/// Declare the schema of a virtual table.
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pub fn declare_vtab(&self, sql: &str) -> Result<()> {
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self.db
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.borrow_mut()
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.declare_vtab(sql)
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.create_module(module_name, module, aux)
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}
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}
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@ -76,18 +59,18 @@ unsafe extern "C" fn free_boxed_value<T>(p: *mut libc::c_void) {
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static RUST_MODULE: ffi::sqlite3_module = ffi::sqlite3_module {
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iVersion: 1,
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xCreate: Some(xCreate),
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xConnect: Some(xCreate), /* A virtual table is eponymous if its xCreate method is the exact same function as the xConnect method */
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xBestIndex: Some(xBestIndex),
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xDisconnect: Some(xDestroy),
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xDestroy: Some(xDestroy),
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xOpen: Some(xOpen),
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xClose: Some(xClose),
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xFilter: Some(xFilter),
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xNext: Some(xNext),
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xEof: Some(xEof),
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xColumn: Some(xColumn),
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xRowid: Some(xRowid),
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xCreate: Some(x_create),
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xConnect: Some(x_create), /* A virtual table is eponymous if its xCreate method is the exact same function as the xConnect method */
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xBestIndex: Some(x_best_index),
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xDisconnect: Some(x_destroy),
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xDestroy: Some(x_destroy),
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xOpen: Some(x_open),
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xClose: Some(x_close),
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xFilter: Some(x_filter),
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xNext: Some(x_next),
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xEof: Some(x_eof),
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xColumn: Some(x_column),
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xRowid: Some(x_rowid),
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xUpdate: None, // TODO
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xBegin: None,
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xSync: None,
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@ -100,175 +83,217 @@ static RUST_MODULE: ffi::sqlite3_module = ffi::sqlite3_module {
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xRollbackTo: None,
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};
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unsafe extern "C" fn xCreate(arg1: *mut ffi::sqlite3,
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pAux: *mut libc::c_void,
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argc: libc::c_int,
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argv: *const *const libc::c_char,
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ppVTab: *mut *mut ffi::sqlite3_vtab,
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arg2: *mut *mut libc::c_char)
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-> libc::c_int {
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unimplemented!()
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}
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unsafe extern "C" fn xBestIndex(pVTab: *mut ffi::sqlite3_vtab,
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info: *mut ffi::sqlite3_index_info)
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-> libc::c_int {
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unimplemented!()
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}
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unsafe extern "C" fn xDestroy(pVTab: *mut ffi::sqlite3_vtab) -> libc::c_int {
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unimplemented!()
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}
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unsafe extern "C" fn xOpen(pVTab: *mut ffi::sqlite3_vtab,
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ppCursor: *mut *mut ffi::sqlite3_vtab_cursor)
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-> libc::c_int {
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unimplemented!()
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}
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unsafe extern "C" fn xClose(cursor: *mut ffi::sqlite3_vtab_cursor) -> libc::c_int {
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unimplemented!()
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}
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unsafe extern "C" fn xFilter(cursor: *mut ffi::sqlite3_vtab_cursor,
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idxNum: libc::c_int,
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idxStr: *const libc::c_char,
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argc: libc::c_int,
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argv: *mut *mut ffi::sqlite3_value)
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-> libc::c_int {
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unimplemented!()
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}
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unsafe extern "C" fn xNext(cursor: *mut ffi::sqlite3_vtab_cursor) -> libc::c_int {
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unimplemented!()
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}
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unsafe extern "C" fn xEof(cursor: *mut ffi::sqlite3_vtab_cursor) -> libc::c_int {
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unimplemented!()
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}
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unsafe extern "C" fn xColumn(cursor: *mut ffi::sqlite3_vtab_cursor,
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ctx: *mut ffi::sqlite3_context,
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i: libc::c_int)
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-> libc::c_int {
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unimplemented!()
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}
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unsafe extern "C" fn xRowid(cursor: *mut ffi::sqlite3_vtab_cursor,
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pRowid: *mut ffi::sqlite3_int64)
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-> libc::c_int {
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unimplemented!()
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}
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unsafe extern "C" fn set_err_msg(cursor: *mut ffi::sqlite3_vtab_cursor,
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err_msg: *mut libc::c_char)
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-> libc::c_int {
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let pVtab = (*cursor).pVtab;
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if !(*pVtab).zErrMsg.is_null() {
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ffi::sqlite3_free((*pVtab).zErrMsg as *mut libc::c_void)
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unsafe extern "C" fn x_create(db: *mut ffi::sqlite3,
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aux: *mut libc::c_void,
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argc: libc::c_int,
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argv: *const *const libc::c_char,
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pp_vtab: *mut *mut ffi::sqlite3_vtab,
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err_msg: *mut *mut libc::c_char)
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-> libc::c_int {
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match VTab::new(db, aux, argc, argv) {
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Ok(vtab) => {
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let boxed_vtab: *mut VTab = Box::into_raw(Box::new(vtab));
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*pp_vtab = boxed_vtab as *mut ffi::sqlite3_vtab;
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ffi::SQLITE_OK
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}
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Err(err) => {
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match err {
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Error::SqliteFailure(err, s) => {
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if let Some(s) = s {
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*err_msg = mprintf(&s);
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}
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err.extended_code
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}
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_ => {
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*err_msg = mprintf(err.description());
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ffi::SQLITE_ERROR
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}
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}
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}
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}
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(*pVtab).zErrMsg = err_msg;
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return ffi::SQLITE_ERROR;
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}
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unsafe extern "C" fn x_destroy(vtab: *mut ffi::sqlite3_vtab) -> libc::c_int {
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let vtab = vtab as *mut VTab;
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let _: Box<VTab> = Box::from_raw(mem::transmute(vtab));
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ffi::SQLITE_OK
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}
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#[repr(C)]
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struct VTab {
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/// Base class
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base: ffi::sqlite3_vtab,
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}
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impl VTab {
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fn new(db: *mut ffi::sqlite3,
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aux: *mut libc::c_void,
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argc: libc::c_int,
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argv: *const *const libc::c_char)
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-> Result<VTab> {
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unimplemented!()
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}
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fn open(&self) -> VTabCursor {
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VTabCursor::new()
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}
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unsafe fn declare_vtab(db: *mut ffi::sqlite3, sql: &str) -> Result<()> {
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let c_sql = try!(CString::new(sql));
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let rc = ffi::sqlite3_declare_vtab(db, c_sql.as_ptr());
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if rc == ffi::SQLITE_OK {
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Ok(())
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} else {
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Err(error_from_sqlite_code(rc, None))
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}
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}
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unsafe fn set_err_msg(&mut self, err_msg: &str) -> libc::c_int {
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if !self.base.zErrMsg.is_null() {
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ffi::sqlite3_free(self.base.zErrMsg as *mut libc::c_void)
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}
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self.base.zErrMsg = mprintf(err_msg);
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return ffi::SQLITE_ERROR;
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}
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}
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unsafe extern "C" fn x_best_index(_vtab: *mut ffi::sqlite3_vtab,
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_info: *mut ffi::sqlite3_index_info)
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-> libc::c_int {
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ffi::SQLITE_OK
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}
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unsafe extern "C" fn x_open(vtab: *mut ffi::sqlite3_vtab,
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pp_cursor: *mut *mut ffi::sqlite3_vtab_cursor)
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-> libc::c_int {
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let vtab = vtab as *mut VTab;
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let cursor = (*vtab).open();
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let boxed_cursor: *mut VTabCursor = Box::into_raw(Box::new(cursor));
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*pp_cursor = boxed_cursor as *mut ffi::sqlite3_vtab_cursor;
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ffi::SQLITE_OK
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}
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unsafe extern "C" fn x_close(cursor: *mut ffi::sqlite3_vtab_cursor) -> libc::c_int {
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let cursor = cursor as *mut VTabCursor;
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let _: Box<VTabCursor> = Box::from_raw(mem::transmute(cursor));
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ffi::SQLITE_OK
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}
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#[repr(C)]
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struct VTabCursor {
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/// Base class
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base: ffi::sqlite3_vtab_cursor,
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/// Current cursor position
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i: usize,
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}
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impl VTabCursor {
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fn new() -> VTabCursor {
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VTabCursor {
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base: Default::default(),
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i: 0,
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}
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}
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unsafe fn vtab(&self) -> *mut VTab {
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self.base.pVtab as *mut VTab
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}
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fn filter(&mut self) -> libc::c_int {
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self.i = 0;
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ffi::SQLITE_OK
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}
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fn next(&mut self) -> libc::c_int {
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self.i = self.i + 1;
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ffi::SQLITE_OK
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}
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fn eof(&self) -> bool {
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unimplemented!()
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}
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fn column(&self, ctx: *mut ffi::sqlite3_context, i: libc::c_int) -> libc::c_int {
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// FIXME Result<()>
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unimplemented!()
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}
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fn rowid(&self) -> i64 {
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self.i as i64
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}
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}
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unsafe extern "C" fn x_filter(cursor: *mut ffi::sqlite3_vtab_cursor,
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_idx_num: libc::c_int,
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_idx_str: *const libc::c_char,
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_argc: libc::c_int,
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_argv: *mut *mut ffi::sqlite3_value)
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-> libc::c_int {
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let cursor = cursor as *mut VTabCursor;
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(*cursor).filter()
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}
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unsafe extern "C" fn x_next(cursor: *mut ffi::sqlite3_vtab_cursor) -> libc::c_int {
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let cursor = cursor as *mut VTabCursor;
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(*cursor).next()
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}
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unsafe extern "C" fn x_eof(cursor: *mut ffi::sqlite3_vtab_cursor) -> libc::c_int {
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let cursor = cursor as *mut VTabCursor;
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(*cursor).eof() as libc::c_int
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}
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unsafe extern "C" fn x_column(cursor: *mut ffi::sqlite3_vtab_cursor,
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ctx: *mut ffi::sqlite3_context,
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i: libc::c_int)
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-> libc::c_int {
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let cursor = cursor as *mut VTabCursor;
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(*cursor).column(ctx, i)
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}
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unsafe extern "C" fn x_rowid(cursor: *mut ffi::sqlite3_vtab_cursor,
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p_rowid: *mut ffi::sqlite3_int64)
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-> libc::c_int {
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let cursor = cursor as *mut VTabCursor;
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*p_rowid = (*cursor).rowid();
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ffi::SQLITE_OK
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}
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unsafe extern "C" fn result_error(ctx: *mut ffi::sqlite3_context, err: Error) -> libc::c_int {
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match err {
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Error::SqliteFailure(err, s) => {
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ffi::sqlite3_result_error_code(ctx, err.extended_code);
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if let Some(Ok(cstr)) = s.map(|s| str_to_cstring(&s)) {
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ffi::sqlite3_result_error(ctx, cstr.as_ptr(), -1);
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}
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err.extended_code
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}
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_ => {
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ffi::sqlite3_result_error_code(ctx, ffi::SQLITE_CORRUPT_VTAB);
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if let Ok(cstr) = str_to_cstring(err.description()) {
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ffi::sqlite3_result_error(ctx, cstr.as_ptr(), -1);
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}
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ffi::SQLITE_CORRUPT_VTAB
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}
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}
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}
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// Space to hold this error message string must be obtained from an SQLite memory allocation function.
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unsafe fn mprintf(err_msg: &str) -> *mut ::libc::c_char {
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let c_format = CString::new("%s").unwrap();
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let c_err = CString::new(err_msg).unwrap();
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ffi::sqlite3_mprintf(c_format.as_ptr(), c_err.as_ptr())
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}
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impl InnerConnection {
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fn create_module<M>(&mut self, module_name: &str, module: M) -> Result<()>
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where M: Module
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{
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let boxed_mod: *mut M = Box::into_raw(Box::new(module));
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fn create_module<A>(&mut self,
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module_name: &str,
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module: *const ffi::sqlite3_module,
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aux: A)
|
||||
-> Result<()> {
|
||||
// FIXME Both rust_module and aux need to be boxed
|
||||
let boxed_aux: *mut A = Box::into_raw(Box::new(aux));
|
||||
let c_name = try!(str_to_cstring(module_name));
|
||||
let r = unsafe {
|
||||
ffi::sqlite3_create_module_v2(self.db(),
|
||||
c_name.as_ptr(),
|
||||
ptr::null_mut(), // FIXME *const sqlite3_module
|
||||
mem::transmute(boxed_mod),
|
||||
Some(mem::transmute(free_boxed_value::<M>)))
|
||||
module,
|
||||
mem::transmute(boxed_aux),
|
||||
Some(mem::transmute(free_boxed_value::<A>)))
|
||||
};
|
||||
self.decode_result(r)
|
||||
}
|
||||
|
||||
fn declare_vtab(&mut self, sql: &str) -> Result<()> {
|
||||
let c_sql = try!(str_to_cstring(sql));
|
||||
let r = unsafe { ffi::sqlite3_declare_vtab(self.db(), c_sql.as_ptr()) };
|
||||
self.decode_result(r)
|
||||
}
|
||||
}
|
||||
|
||||
// A intarray table
|
||||
// #[repr(C)]
|
||||
// struct IntArrayVTab {
|
||||
// Base class
|
||||
// base: ffi::sqlite3_vtab,
|
||||
// }
|
||||
//
|
||||
// impl VTab for IntArrayVTab {
|
||||
//
|
||||
// }
|
||||
//
|
||||
// impl Drop for IntArrayVTab {
|
||||
// fn drop(&mut self) {
|
||||
// FIXME
|
||||
// }
|
||||
// }
|
||||
//
|
||||
// A intarray cursor
|
||||
// #[repr(C)]
|
||||
// struct IntArrayCursor {
|
||||
// Base class
|
||||
// base: ffi::sqlite3_vtab_cursor,
|
||||
// i: usize
|
||||
// }
|
||||
//
|
||||
// impl Cursor for IntArrayCursor {
|
||||
// type V = IntArrayVTab;
|
||||
//
|
||||
// fn filter(&mut self) -> Result<()> {
|
||||
// self.i = 0;
|
||||
// Ok(())
|
||||
// }
|
||||
// fn next(&mut self) -> Result<()> {
|
||||
// self.i = self.i + 1;
|
||||
// Ok(())
|
||||
// }
|
||||
// fn eof(&self) -> bool {
|
||||
// false // FIXME
|
||||
// }
|
||||
// fn column(&self, ctx: *mut ffi::sqlite3_context, _: i32) -> Result<()> {
|
||||
// let v: i64 = 0; // FIXME
|
||||
// unsafe {
|
||||
// v.set_result(ctx);
|
||||
// }
|
||||
// Ok(())
|
||||
// }
|
||||
// fn rowid(&self) -> i64 {
|
||||
// self.i as i64
|
||||
// }
|
||||
// }
|
||||
//
|
||||
// impl Drop for IntArrayCursor {
|
||||
// fn drop(&mut self) {
|
||||
// FIXME
|
||||
// }
|
||||
// }
|
||||
|
||||
// #[repr(C)]
|
||||
// #[derive(Copy)]
|
||||
// pub struct Struct_sqlite3_vtab {
|
||||
// pub pModule: *const sqlite3_module,
|
||||
// pub nRef: libc::c_int,
|
||||
// pub zErrMsg: *mut libc::c_char,
|
||||
// }
|
||||
// #[repr(C)]
|
||||
// #[derive(Copy)]
|
||||
// pub struct Struct_sqlite3_vtab_cursor {
|
||||
// pub pVtab: *mut sqlite3_vtab,
|
||||
// }
|
||||
//
|
||||
|
||||
// file:///usr/local/share/doc/rust/html/book/ffi.html#targeting-callbacks-to-rust-objects
|
||||
//
|
||||
// #[repr(C)]
|
||||
// struct RustObject {
|
||||
// a: i32,
|
||||
// other members
|
||||
// }
|
||||
//
|
||||
// file:///usr/local/share/doc/rust/html/book/associated-types.html#implementing-associated-types
|
||||
// file:///usr/local/share/doc/rust/html/book/closures.html
|
||||
//
|
||||
|
||||
#[cfg(test)]
|
||||
mod test {
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user