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Add series table-valued-function.

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This commit is contained in:
gwenn
2016-08-14 19:53:47 +02:00
parent 3b5bd7abab
commit 424a6c0cc8
4 changed files with 270 additions and 19 deletions
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22
src/vtab/mod.rs
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@@ -44,7 +44,7 @@ use types::FromSql;
pub trait VTab<C: VTabCursor<Self>>: Sized {
/// Create a new instance of a virtual table in response to a CREATE VIRTUAL TABLE statement.
/// The `db` parameter is a pointer to the SQLite database connection that is executing the CREATE VIRTUAL TABLE statement.
fn create(db: *mut ffi::sqlite3, aux: *mut libc::c_void, args: &[&[u8]]) -> Result<Self>;
fn connect(db: *mut ffi::sqlite3, aux: *mut libc::c_void, args: &[&[u8]]) -> Result<Self>;
/// Determine the best way to access the virtual table.
fn best_index(&self, info: &mut IndexInfo) -> Result<()>;
/// Create a new cursor used for accessing a virtual table.
@@ -90,7 +90,7 @@ impl IndexInfo {
}
}
/// True if this constraint is usable
pub fn constraint_usable(&self, constraint_idx: usize) -> bool {
pub fn is_constraint_usable(&self, constraint_idx: usize) -> bool {
use std::slice;
unsafe {
let constraints = slice::from_raw_parts((*self.0).aConstraint,
@@ -288,18 +288,19 @@ unsafe extern "C" fn free_boxed_value<T>(p: *mut libc::c_void) {
#[macro_export]
macro_rules! init_module {
($module_name: ident, $vtab: ident, $cursor: ty,
$create: ident, $best_index: ident, $destroy: ident,
$create: expr, $connect: ident, $best_index: ident,
$disconnect: ident, $destroy: expr,
$open: ident, $close: ident,
$filter: ident, $next: ident, $eof: ident,
$column: ident, $rowid: ident) => {
static $module_name: ffi::sqlite3_module = ffi::sqlite3_module {
iVersion: 1,
xCreate: Some($create),
xConnect: Some($create), /* A virtual table is eponymous if its xCreate method is the exact same function as the xConnect method */
xCreate: $create,
xConnect: Some($connect), /* A virtual table is eponymous if its xCreate method is the exact same function as the xConnect method */
xBestIndex: Some($best_index),
xDisconnect: Some($destroy),
xDestroy: Some($destroy),
xDisconnect: Some($disconnect),
xDestroy: $destroy,
xOpen: Some($open),
xClose: Some($close),
xFilter: Some($filter),
@@ -319,7 +320,7 @@ static $module_name: ffi::sqlite3_module = ffi::sqlite3_module {
xRollbackTo: None,
};
unsafe extern "C" fn $create(db: *mut ffi::sqlite3,
unsafe extern "C" fn $connect(db: *mut ffi::sqlite3,
aux: *mut libc::c_void,
argc: libc::c_int,
argv: *const *const libc::c_char,
@@ -334,7 +335,7 @@ unsafe extern "C" fn $create(db: *mut ffi::sqlite3,
let vec = args.iter().map(|cs| {
CStr::from_ptr(*cs).to_bytes()
}).collect::<Vec<_>>();
match $vtab::create(db, aux, &vec[..]) {
match $vtab::connect(db, aux, &vec[..]) {
Ok(vtab) => {
let boxed_vtab: *mut $vtab = Box::into_raw(Box::new(vtab));
*pp_vtab = boxed_vtab as *mut ffi::sqlite3_vtab;
@@ -375,7 +376,7 @@ unsafe extern "C" fn $best_index(vtab: *mut ffi::sqlite3_vtab,
}
}
unsafe extern "C" fn $destroy(vtab: *mut ffi::sqlite3_vtab) -> libc::c_int {
unsafe extern "C" fn $disconnect(vtab: *mut ffi::sqlite3_vtab) -> libc::c_int {
let vtab = vtab as *mut $vtab;
let _: Box<$vtab> = Box::from_raw(vtab);
ffi::SQLITE_OK
@@ -536,3 +537,4 @@ pub fn mprintf(err_msg: &str) -> *mut ::libc::c_char {
pub mod int_array;
#[cfg(feature = "csvtab")]
pub mod csvtab;
pub mod series;