rusqlite/src/statement.rs

1062 lines
34 KiB
Rust

use std::ffi::CStr;
use std::iter::IntoIterator;
use std::os::raw::{c_char, c_int, c_void};
#[cfg(feature = "array")]
use std::rc::Rc;
use std::slice::from_raw_parts;
use std::{convert, fmt, mem, ptr, result, str};
use super::ffi;
use super::{len_as_c_int, str_for_sqlite, str_to_cstring};
use super::{
AndThenRows, Connection, Error, MappedRows, RawStatement, Result, Row, Rows, ValueRef,
};
use crate::types::{ToSql, ToSqlOutput};
#[cfg(feature = "array")]
use crate::vtab::array::{free_array, ARRAY_TYPE};
/// A prepared statement.
pub struct Statement<'conn> {
conn: &'conn Connection,
pub(crate) stmt: RawStatement,
}
impl Statement<'_> {
/// Execute the prepared statement.
///
/// On success, returns the number of rows that were changed or inserted or
/// deleted (via `sqlite3_changes`).
///
/// ## Example
///
/// ```rust,no_run
/// # use rusqlite::{Connection, Result};
/// fn update_rows(conn: &Connection) -> Result<()> {
/// let mut stmt = conn.prepare("UPDATE foo SET bar = 'baz' WHERE qux = ?")?;
///
/// stmt.execute(&[1i32])?;
/// stmt.execute(&[2i32])?;
///
/// Ok(())
/// }
/// ```
///
/// # Failure
///
/// Will return `Err` if binding parameters fails, the executed statement
/// returns rows (in which case `query` should be used instead), or the
/// underling SQLite call fails.
pub fn execute<P>(&mut self, params: P) -> Result<usize>
where
P: IntoIterator,
P::Item: ToSql,
{
self.bind_parameters(params)?;
self.execute_with_bound_parameters()
}
/// Execute the prepared statement with named parameter(s). If any
/// parameters that were in the prepared statement are not included in
/// `params`, they will continue to use the most-recently bound value
/// from a previous call to `execute_named`, or `NULL` if they have
/// never been bound.
///
/// On success, returns the number of rows that were changed or inserted or
/// deleted (via `sqlite3_changes`).
///
/// ## Example
///
/// ```rust,no_run
/// # use rusqlite::{Connection, Result};
/// fn insert(conn: &Connection) -> Result<usize> {
/// let mut stmt = conn.prepare("INSERT INTO test (name) VALUES (:name)")?;
/// stmt.execute_named(&[(":name", &"one")])
/// }
/// ```
///
/// Note, the `named_params` macro is provided for syntactic convenience,
/// and so the above example could also be written as:
///
/// ```rust,no_run
/// # use rusqlite::{Connection, Result, named_params};
/// fn insert(conn: &Connection) -> Result<usize> {
/// let mut stmt = conn.prepare("INSERT INTO test (name) VALUES (:name)")?;
/// stmt.execute_named(named_params!{":name": "one"})
/// }
/// ```
///
/// # Failure
///
/// Will return `Err` if binding parameters fails, the executed statement
/// returns rows (in which case `query` should be used instead), or the
/// underling SQLite call fails.
pub fn execute_named(&mut self, params: &[(&str, &dyn ToSql)]) -> Result<usize> {
self.bind_parameters_named(params)?;
self.execute_with_bound_parameters()
}
/// Execute an INSERT and return the ROWID.
///
/// # Note
///
/// This function is a convenience wrapper around `execute()` intended for
/// queries that insert a single item. It is possible to misuse this
/// function in a way that it cannot detect, such as by calling it on a
/// statement which _updates_ a single
/// item rather than inserting one. Please don't do that.
///
/// # Failure
///
/// Will return `Err` if no row is inserted or many rows are inserted.
pub fn insert<P>(&mut self, params: P) -> Result<i64>
where
P: IntoIterator,
P::Item: ToSql,
{
let changes = self.execute(params)?;
match changes {
1 => Ok(self.conn.last_insert_rowid()),
_ => Err(Error::StatementChangedRows(changes)),
}
}
/// Execute the prepared statement, returning a handle to the resulting
/// rows.
///
/// Due to lifetime restricts, the rows handle returned by `query` does not
/// implement the `Iterator` trait. Consider using `query_map` or
/// `query_and_then` instead, which do.
///
/// ## Example
///
/// ```rust,no_run
/// # use rusqlite::{Connection, Result, NO_PARAMS};
/// fn get_names(conn: &Connection) -> Result<Vec<String>> {
/// let mut stmt = conn.prepare("SELECT name FROM people")?;
/// let mut rows = stmt.query(NO_PARAMS)?;
///
/// let mut names = Vec::new();
/// while let Some(row) = rows.next()? {
/// names.push(row.get(0)?);
/// }
///
/// Ok(names)
/// }
/// ```
///
/// ## Failure
///
/// Will return `Err` if binding parameters fails.
pub fn query<P>(&mut self, params: P) -> Result<Rows<'_>>
where
P: IntoIterator,
P::Item: ToSql,
{
self.check_readonly()?;
self.bind_parameters(params)?;
Ok(Rows::new(self))
}
/// Execute the prepared statement with named parameter(s), returning a
/// handle for the resulting rows. If any parameters that were in the
/// prepared statement are not included in `params`, they will continue
/// to use the most-recently bound value from a previous
/// call to `query_named`, or `NULL` if they have never been bound.
///
/// ## Example
///
/// ```rust,no_run
/// # use rusqlite::{Connection, Result};
/// fn query(conn: &Connection) -> Result<()> {
/// let mut stmt = conn.prepare("SELECT * FROM test where name = :name")?;
/// let mut rows = stmt.query_named(&[(":name", &"one")])?;
/// while let Some(row) = rows.next()? {
/// // ...
/// }
/// Ok(())
/// }
/// ```
///
/// Note, the `named_params!` macro is provided for syntactic convenience,
/// and so the above example could also be written as:
///
/// ```rust,no_run
/// # use rusqlite::{Connection, Result, named_params};
/// fn query(conn: &Connection) -> Result<()> {
/// let mut stmt = conn.prepare("SELECT * FROM test where name = :name")?;
/// let mut rows = stmt.query_named(named_params!{ ":name": "one" })?;
/// while let Some(row) = rows.next()? {
/// // ...
/// }
/// Ok(())
/// }
/// ```
///
/// # Failure
///
/// Will return `Err` if binding parameters fails.
pub fn query_named(&mut self, params: &[(&str, &dyn ToSql)]) -> Result<Rows<'_>> {
self.check_readonly()?;
self.bind_parameters_named(params)?;
Ok(Rows::new(self))
}
/// Executes the prepared statement and maps a function over the resulting
/// rows, returning an iterator over the mapped function results.
///
/// ## Example
///
/// ```rust,no_run
/// # use rusqlite::{Connection, Result, NO_PARAMS};
/// fn get_names(conn: &Connection) -> Result<Vec<String>> {
/// let mut stmt = conn.prepare("SELECT name FROM people")?;
/// let rows = stmt.query_map(NO_PARAMS, |row| row.get(0))?;
///
/// let mut names = Vec::new();
/// for name_result in rows {
/// names.push(name_result?);
/// }
///
/// Ok(names)
/// }
/// ```
///
/// ## Failure
///
/// Will return `Err` if binding parameters fails.
pub fn query_map<T, P, F>(&mut self, params: P, f: F) -> Result<MappedRows<'_, F>>
where
P: IntoIterator,
P::Item: ToSql,
F: FnMut(&Row<'_>) -> Result<T>,
{
let rows = self.query(params)?;
Ok(MappedRows::new(rows, f))
}
/// Execute the prepared statement with named parameter(s), returning an
/// iterator over the result of calling the mapping function over the
/// query's rows. If any parameters that were in the prepared statement
/// are not included in `params`, they will continue to use the
/// most-recently bound value from a previous call to `query_named`,
/// or `NULL` if they have never been bound.
///
/// ## Example
///
/// ```rust,no_run
/// # use rusqlite::{Connection, Result};
/// fn get_names(conn: &Connection) -> Result<Vec<String>> {
/// let mut stmt = conn.prepare("SELECT name FROM people WHERE id = :id")?;
/// let rows = stmt.query_map_named(&[(":id", &"one")], |row| row.get(0))?;
///
/// let mut names = Vec::new();
/// for name_result in rows {
/// names.push(name_result?);
/// }
///
/// Ok(names)
/// }
/// ```
///
/// ## Failure
///
/// Will return `Err` if binding parameters fails.
pub fn query_map_named<T, F>(
&mut self,
params: &[(&str, &dyn ToSql)],
f: F,
) -> Result<MappedRows<'_, F>>
where
F: FnMut(&Row<'_>) -> Result<T>,
{
let rows = self.query_named(params)?;
Ok(MappedRows::new(rows, f))
}
/// Executes the prepared statement and maps a function over the resulting
/// rows, where the function returns a `Result` with `Error` type
/// implementing `std::convert::From<Error>` (so errors can be unified).
///
/// # Failure
///
/// Will return `Err` if binding parameters fails.
pub fn query_and_then<T, E, P, F>(&mut self, params: P, f: F) -> Result<AndThenRows<'_, F>>
where
P: IntoIterator,
P::Item: ToSql,
E: convert::From<Error>,
F: FnMut(&Row<'_>) -> result::Result<T, E>,
{
let rows = self.query(params)?;
Ok(AndThenRows::new(rows, f))
}
/// Execute the prepared statement with named parameter(s), returning an
/// iterator over the result of calling the mapping function over the
/// query's rows. If any parameters that were in the prepared statement
/// are not included in
/// `params`, they will
/// continue to use the most-recently bound value from a previous call
/// to `query_named`, or `NULL` if they have never been bound.
///
/// ## Example
///
/// ```rust,no_run
/// # use rusqlite::{Connection, Result};
/// struct Person {
/// name: String,
/// };
///
/// fn name_to_person(name: String) -> Result<Person> {
/// // ... check for valid name
/// Ok(Person { name: name })
/// }
///
/// fn get_names(conn: &Connection) -> Result<Vec<Person>> {
/// let mut stmt = conn.prepare("SELECT name FROM people WHERE id = :id")?;
/// let rows =
/// stmt.query_and_then_named(&[(":id", &"one")], |row| name_to_person(row.get(0)?))?;
///
/// let mut persons = Vec::new();
/// for person_result in rows {
/// persons.push(person_result?);
/// }
///
/// Ok(persons)
/// }
/// ```
///
/// ## Failure
///
/// Will return `Err` if binding parameters fails.
pub fn query_and_then_named<T, E, F>(
&mut self,
params: &[(&str, &dyn ToSql)],
f: F,
) -> Result<AndThenRows<'_, F>>
where
E: convert::From<Error>,
F: FnMut(&Row<'_>) -> result::Result<T, E>,
{
let rows = self.query_named(params)?;
Ok(AndThenRows::new(rows, f))
}
/// Return `true` if a query in the SQL statement it executes returns one
/// or more rows and `false` if the SQL returns an empty set.
pub fn exists<P>(&mut self, params: P) -> Result<bool>
where
P: IntoIterator,
P::Item: ToSql,
{
let mut rows = self.query(params)?;
let exists = rows.next()?.is_some();
Ok(exists)
}
/// Convenience method to execute a query that is expected to return a
/// single row.
///
/// If the query returns more than one row, all rows except the first are
/// ignored.
///
/// Returns `Err(QueryReturnedNoRows)` if no results are returned. If the
/// query truly is optional, you can call `.optional()` on the result of
/// this to get a `Result<Option<T>>`.
///
/// # Failure
///
/// Will return `Err` if the underlying SQLite call fails.
pub fn query_row<T, P, F>(&mut self, params: P, f: F) -> Result<T>
where
P: IntoIterator,
P::Item: ToSql,
F: FnOnce(&Row<'_>) -> Result<T>,
{
let mut rows = self.query(params)?;
rows.get_expected_row().and_then(|r| f(&r))
}
/// Convenience method to execute a query with named parameter(s) that is
/// expected to return a single row.
///
/// If the query returns more than one row, all rows except the first are
/// ignored.
///
/// Returns `Err(QueryReturnedNoRows)` if no results are returned. If the
/// query truly is optional, you can call `.optional()` on the result of
/// this to get a `Result<Option<T>>`.
///
/// # Failure
///
/// Will return `Err` if `sql` cannot be converted to a C-compatible string
/// or if the underlying SQLite call fails.
pub fn query_row_named<T, F>(&mut self, params: &[(&str, &dyn ToSql)], f: F) -> Result<T>
where
F: FnOnce(&Row<'_>) -> Result<T>,
{
let mut rows = self.query_named(params)?;
rows.get_expected_row().and_then(|r| f(&r))
}
/// Consumes the statement.
///
/// Functionally equivalent to the `Drop` implementation, but allows
/// callers to see any errors that occur.
///
/// # Failure
///
/// Will return `Err` if the underlying SQLite call fails.
pub fn finalize(mut self) -> Result<()> {
self.finalize_()
}
/// Return the index of an SQL parameter given its name.
///
/// # Failure
///
/// Will return Err if `name` is invalid. Will return Ok(None) if the name
/// is valid but not a bound parameter of this statement.
pub fn parameter_index(&self, name: &str) -> Result<Option<usize>> {
let c_name = str_to_cstring(name)?;
Ok(self.stmt.bind_parameter_index(&c_name))
}
fn bind_parameters<P>(&mut self, params: P) -> Result<()>
where
P: IntoIterator,
P::Item: ToSql,
{
let expected = self.stmt.bind_parameter_count();
let mut index = 0;
for p in params.into_iter() {
index += 1; // The leftmost SQL parameter has an index of 1.
if index > expected {
break;
}
self.bind_parameter(&p, index)?;
}
assert_eq!(
index, expected,
"incorrect number of parameters: expected {}, got {}",
expected, index
);
Ok(())
}
fn bind_parameters_named(&mut self, params: &[(&str, &dyn ToSql)]) -> Result<()> {
for &(name, value) in params {
if let Some(i) = self.parameter_index(name)? {
self.bind_parameter(value, i)?;
} else {
return Err(Error::InvalidParameterName(name.into()));
}
}
Ok(())
}
fn bind_parameter(&self, param: &dyn ToSql, col: usize) -> Result<()> {
let value = param.to_sql()?;
let ptr = unsafe { self.stmt.ptr() };
let value = match value {
ToSqlOutput::Borrowed(v) => v,
ToSqlOutput::Owned(ref v) => ValueRef::from(v),
#[cfg(feature = "blob")]
ToSqlOutput::ZeroBlob(len) => {
return self
.conn
.decode_result(unsafe { ffi::sqlite3_bind_zeroblob(ptr, col as c_int, len) });
}
#[cfg(feature = "array")]
ToSqlOutput::Array(a) => {
return self.conn.decode_result(unsafe {
ffi::sqlite3_bind_pointer(
ptr,
col as c_int,
Rc::into_raw(a) as *mut c_void,
ARRAY_TYPE,
Some(free_array),
)
});
}
};
self.conn.decode_result(match value {
ValueRef::Null => unsafe { ffi::sqlite3_bind_null(ptr, col as c_int) },
ValueRef::Integer(i) => unsafe { ffi::sqlite3_bind_int64(ptr, col as c_int, i) },
ValueRef::Real(r) => unsafe { ffi::sqlite3_bind_double(ptr, col as c_int, r) },
ValueRef::Text(s) => unsafe {
let (c_str, len, destructor) = str_for_sqlite(s)?;
ffi::sqlite3_bind_text(ptr, col as c_int, c_str, len, destructor)
},
ValueRef::Blob(b) => unsafe {
let length = len_as_c_int(b.len())?;
if length == 0 {
ffi::sqlite3_bind_zeroblob(ptr, col as c_int, 0)
} else {
ffi::sqlite3_bind_blob(
ptr,
col as c_int,
b.as_ptr() as *const c_void,
length,
ffi::SQLITE_TRANSIENT(),
)
}
},
})
}
fn execute_with_bound_parameters(&mut self) -> Result<usize> {
self.check_update()?;
let r = self.stmt.step();
self.stmt.reset();
match r {
ffi::SQLITE_DONE => {
if self.column_count() == 0 {
Ok(self.conn.changes())
} else {
Err(Error::ExecuteReturnedResults)
}
}
ffi::SQLITE_ROW => Err(Error::ExecuteReturnedResults),
_ => Err(self.conn.decode_result(r).unwrap_err()),
}
}
fn finalize_(&mut self) -> Result<()> {
let mut stmt = RawStatement::new(ptr::null_mut(), false);
mem::swap(&mut stmt, &mut self.stmt);
self.conn.decode_result(stmt.finalize())
}
#[cfg(not(feature = "bundled"))]
#[inline]
fn check_readonly(&self) -> Result<()> {
Ok(())
}
#[cfg(feature = "bundled")]
#[inline]
fn check_readonly(&self) -> Result<()> {
/*if !self.stmt.readonly() { does not work for PRAGMA
return Err(Error::InvalidQuery);
}*/
Ok(())
}
#[cfg(all(feature = "bundled", feature = "extra_check"))]
#[inline]
fn check_update(&self) -> Result<()> {
if self.column_count() > 0 || self.stmt.readonly() {
return Err(Error::ExecuteReturnedResults);
}
Ok(())
}
#[cfg(all(not(feature = "bundled"), feature = "extra_check"))]
#[inline]
fn check_update(&self) -> Result<()> {
if self.column_count() > 0 {
return Err(Error::ExecuteReturnedResults);
}
Ok(())
}
#[cfg(not(feature = "extra_check"))]
#[inline]
fn check_update(&self) -> Result<()> {
Ok(())
}
/// Returns a string containing the SQL text of prepared statement with
/// bound parameters expanded.
#[cfg(feature = "bundled")]
pub fn expanded_sql(&self) -> Option<String> {
unsafe {
match self.stmt.expanded_sql() {
Some(s) => {
let sql = str::from_utf8_unchecked(s.to_bytes()).to_owned();
ffi::sqlite3_free(s.as_ptr() as *mut _);
Some(sql)
}
_ => None,
}
}
}
/// Get the value for one of the status counters for this statement.
pub fn get_status(&self, status: StatementStatus) -> i32 {
self.stmt.get_status(status, false)
}
/// Reset the value of one of the status counters for this statement,
/// returning the value it had before resetting.
pub fn reset_status(&self, status: StatementStatus) -> i32 {
self.stmt.get_status(status, true)
}
#[cfg(feature = "extra_check")]
pub(crate) fn check_no_tail(&self) -> Result<()> {
if self.stmt.has_tail() {
Err(Error::MultipleStatement)
} else {
Ok(())
}
}
#[cfg(not(feature = "extra_check"))]
#[inline]
pub(crate) fn check_no_tail(&self) -> Result<()> {
Ok(())
}
}
impl Into<RawStatement> for Statement<'_> {
fn into(mut self) -> RawStatement {
let mut stmt = RawStatement::new(ptr::null_mut(), false);
mem::swap(&mut stmt, &mut self.stmt);
stmt
}
}
impl fmt::Debug for Statement<'_> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
let sql = str::from_utf8(self.stmt.sql().to_bytes());
f.debug_struct("Statement")
.field("conn", self.conn)
.field("stmt", &self.stmt)
.field("sql", &sql)
.finish()
}
}
impl Drop for Statement<'_> {
#[allow(unused_must_use)]
fn drop(&mut self) {
self.finalize_();
}
}
impl Statement<'_> {
pub(crate) fn new(conn: &Connection, stmt: RawStatement) -> Statement<'_> {
Statement { conn, stmt }
}
pub(crate) fn value_ref(&self, col: usize) -> ValueRef<'_> {
let raw = unsafe { self.stmt.ptr() };
match self.stmt.column_type(col) {
ffi::SQLITE_NULL => ValueRef::Null,
ffi::SQLITE_INTEGER => {
ValueRef::Integer(unsafe { ffi::sqlite3_column_int64(raw, col as c_int) })
}
ffi::SQLITE_FLOAT => {
ValueRef::Real(unsafe { ffi::sqlite3_column_double(raw, col as c_int) })
}
ffi::SQLITE_TEXT => {
let s = unsafe {
let text = ffi::sqlite3_column_text(raw, col as c_int);
assert!(
!text.is_null(),
"unexpected SQLITE_TEXT column type with NULL data"
);
CStr::from_ptr(text as *const c_char)
};
let s = s.to_bytes();
ValueRef::Text(s)
}
ffi::SQLITE_BLOB => {
let (blob, len) = unsafe {
(
ffi::sqlite3_column_blob(raw, col as c_int),
ffi::sqlite3_column_bytes(raw, col as c_int),
)
};
assert!(
len >= 0,
"unexpected negative return from sqlite3_column_bytes"
);
if len > 0 {
assert!(
!blob.is_null(),
"unexpected SQLITE_BLOB column type with NULL data"
);
ValueRef::Blob(unsafe { from_raw_parts(blob as *const u8, len as usize) })
} else {
// The return value from sqlite3_column_blob() for a zero-length BLOB
// is a NULL pointer.
ValueRef::Blob(&[])
}
}
_ => unreachable!("sqlite3_column_type returned invalid value"),
}
}
pub(crate) fn step(&self) -> Result<bool> {
match self.stmt.step() {
ffi::SQLITE_ROW => Ok(true),
ffi::SQLITE_DONE => Ok(false),
code => Err(self.conn.decode_result(code).unwrap_err()),
}
}
pub(crate) fn reset(&self) -> c_int {
self.stmt.reset()
}
}
/// Prepared statement status counters.
///
/// See https://www.sqlite.org/c3ref/c_stmtstatus_counter.html
/// for explanations of each.
///
/// Note that depending on your version of SQLite, all of these
/// may not be available.
#[repr(i32)]
#[derive(Clone, Copy, PartialEq, Eq)]
pub enum StatementStatus {
/// Equivalent to SQLITE_STMTSTATUS_FULLSCAN_STEP
FullscanStep = 1,
/// Equivalent to SQLITE_STMTSTATUS_SORT
Sort = 2,
/// Equivalent to SQLITE_STMTSTATUS_AUTOINDEX
AutoIndex = 3,
/// Equivalent to SQLITE_STMTSTATUS_VM_STEP
VmStep = 4,
/// Equivalent to SQLITE_STMTSTATUS_REPREPARE
RePrepare = 5,
/// Equivalent to SQLITE_STMTSTATUS_RUN
Run = 6,
/// Equivalent to SQLITE_STMTSTATUS_MEMUSED
MemUsed = 99,
}
#[cfg(test)]
mod test {
use crate::types::ToSql;
use crate::{Connection, Error, Result, NO_PARAMS};
#[test]
fn test_execute_named() {
let db = Connection::open_in_memory().unwrap();
db.execute_batch("CREATE TABLE foo(x INTEGER)").unwrap();
assert_eq!(
db.execute_named("INSERT INTO foo(x) VALUES (:x)", &[(":x", &1i32)])
.unwrap(),
1
);
assert_eq!(
db.execute_named("INSERT INTO foo(x) VALUES (:x)", &[(":x", &2i32)])
.unwrap(),
1
);
assert_eq!(
3i32,
db.query_row_named::<i32, _>(
"SELECT SUM(x) FROM foo WHERE x > :x",
&[(":x", &0i32)],
|r| r.get(0)
)
.unwrap()
);
}
#[test]
fn test_stmt_execute_named() {
let db = Connection::open_in_memory().unwrap();
let sql = "CREATE TABLE test (id INTEGER PRIMARY KEY NOT NULL, name TEXT NOT NULL, flag \
INTEGER)";
db.execute_batch(sql).unwrap();
let mut stmt = db
.prepare("INSERT INTO test (name) VALUES (:name)")
.unwrap();
stmt.execute_named(&[(":name", &"one")]).unwrap();
let mut stmt = db
.prepare("SELECT COUNT(*) FROM test WHERE name = :name")
.unwrap();
assert_eq!(
1i32,
stmt.query_row_named::<i32, _>(&[(":name", &"one")], |r| r.get(0))
.unwrap()
);
}
#[test]
fn test_query_named() {
let db = Connection::open_in_memory().unwrap();
let sql = r#"
CREATE TABLE test (id INTEGER PRIMARY KEY NOT NULL, name TEXT NOT NULL, flag INTEGER);
INSERT INTO test(id, name) VALUES (1, "one");
"#;
db.execute_batch(sql).unwrap();
let mut stmt = db
.prepare("SELECT id FROM test where name = :name")
.unwrap();
let mut rows = stmt.query_named(&[(":name", &"one")]).unwrap();
let id: Result<i32> = rows.next().unwrap().unwrap().get(0);
assert_eq!(Ok(1), id);
}
#[test]
fn test_query_map_named() {
let db = Connection::open_in_memory().unwrap();
let sql = r#"
CREATE TABLE test (id INTEGER PRIMARY KEY NOT NULL, name TEXT NOT NULL, flag INTEGER);
INSERT INTO test(id, name) VALUES (1, "one");
"#;
db.execute_batch(sql).unwrap();
let mut stmt = db
.prepare("SELECT id FROM test where name = :name")
.unwrap();
let mut rows = stmt
.query_map_named(&[(":name", &"one")], |row| {
let id: Result<i32> = row.get(0);
id.map(|i| 2 * i)
})
.unwrap();
let doubled_id: i32 = rows.next().unwrap().unwrap();
assert_eq!(2, doubled_id);
}
#[test]
fn test_query_and_then_named() {
let db = Connection::open_in_memory().unwrap();
let sql = r#"
CREATE TABLE test (id INTEGER PRIMARY KEY NOT NULL, name TEXT NOT NULL, flag INTEGER);
INSERT INTO test(id, name) VALUES (1, "one");
INSERT INTO test(id, name) VALUES (2, "one");
"#;
db.execute_batch(sql).unwrap();
let mut stmt = db
.prepare("SELECT id FROM test where name = :name ORDER BY id ASC")
.unwrap();
let mut rows = stmt
.query_and_then_named(&[(":name", &"one")], |row| {
let id: i32 = row.get(0)?;
if id == 1 {
Ok(id)
} else {
Err(Error::SqliteSingleThreadedMode)
}
})
.unwrap();
// first row should be Ok
let doubled_id: i32 = rows.next().unwrap().unwrap();
assert_eq!(1, doubled_id);
// second row should be Err
#[allow(clippy::match_wild_err_arm)]
match rows.next().unwrap() {
Ok(_) => panic!("invalid Ok"),
Err(Error::SqliteSingleThreadedMode) => (),
Err(_) => panic!("invalid Err"),
}
}
#[test]
fn test_unbound_parameters_are_null() {
let db = Connection::open_in_memory().unwrap();
let sql = "CREATE TABLE test (x TEXT, y TEXT)";
db.execute_batch(sql).unwrap();
let mut stmt = db
.prepare("INSERT INTO test (x, y) VALUES (:x, :y)")
.unwrap();
stmt.execute_named(&[(":x", &"one")]).unwrap();
let result: Option<String> = db
.query_row("SELECT y FROM test WHERE x = 'one'", NO_PARAMS, |row| {
row.get(0)
})
.unwrap();
assert!(result.is_none());
}
#[test]
fn test_unbound_parameters_are_reused() {
let db = Connection::open_in_memory().unwrap();
let sql = "CREATE TABLE test (x TEXT, y TEXT)";
db.execute_batch(sql).unwrap();
let mut stmt = db
.prepare("INSERT INTO test (x, y) VALUES (:x, :y)")
.unwrap();
stmt.execute_named(&[(":x", &"one")]).unwrap();
stmt.execute_named(&[(":y", &"two")]).unwrap();
let result: String = db
.query_row("SELECT x FROM test WHERE y = 'two'", NO_PARAMS, |row| {
row.get(0)
})
.unwrap();
assert_eq!(result, "one");
}
#[test]
fn test_insert() {
let db = Connection::open_in_memory().unwrap();
db.execute_batch("CREATE TABLE foo(x INTEGER UNIQUE)")
.unwrap();
let mut stmt = db
.prepare("INSERT OR IGNORE INTO foo (x) VALUES (?)")
.unwrap();
assert_eq!(stmt.insert(&[1i32]).unwrap(), 1);
assert_eq!(stmt.insert(&[2i32]).unwrap(), 2);
match stmt.insert(&[1i32]).unwrap_err() {
Error::StatementChangedRows(0) => (),
err => panic!("Unexpected error {}", err),
}
let mut multi = db
.prepare("INSERT INTO foo (x) SELECT 3 UNION ALL SELECT 4")
.unwrap();
match multi.insert(NO_PARAMS).unwrap_err() {
Error::StatementChangedRows(2) => (),
err => panic!("Unexpected error {}", err),
}
}
#[test]
fn test_insert_different_tables() {
// Test for https://github.com/jgallagher/rusqlite/issues/171
let db = Connection::open_in_memory().unwrap();
db.execute_batch(
r"
CREATE TABLE foo(x INTEGER);
CREATE TABLE bar(x INTEGER);
",
)
.unwrap();
assert_eq!(
db.prepare("INSERT INTO foo VALUES (10)")
.unwrap()
.insert(NO_PARAMS)
.unwrap(),
1
);
assert_eq!(
db.prepare("INSERT INTO bar VALUES (10)")
.unwrap()
.insert(NO_PARAMS)
.unwrap(),
1
);
}
#[test]
fn test_exists() {
let db = Connection::open_in_memory().unwrap();
let sql = "BEGIN;
CREATE TABLE foo(x INTEGER);
INSERT INTO foo VALUES(1);
INSERT INTO foo VALUES(2);
END;";
db.execute_batch(sql).unwrap();
let mut stmt = db.prepare("SELECT 1 FROM foo WHERE x = ?").unwrap();
assert!(stmt.exists(&[1i32]).unwrap());
assert!(stmt.exists(&[2i32]).unwrap());
assert!(!stmt.exists(&[0i32]).unwrap());
}
#[test]
fn test_query_row() {
let db = Connection::open_in_memory().unwrap();
let sql = "BEGIN;
CREATE TABLE foo(x INTEGER, y INTEGER);
INSERT INTO foo VALUES(1, 3);
INSERT INTO foo VALUES(2, 4);
END;";
db.execute_batch(sql).unwrap();
let mut stmt = db.prepare("SELECT y FROM foo WHERE x = ?").unwrap();
let y: Result<i64> = stmt.query_row(&[1i32], |r| r.get(0));
assert_eq!(3i64, y.unwrap());
}
#[test]
fn test_query_by_column_name() {
let db = Connection::open_in_memory().unwrap();
let sql = "BEGIN;
CREATE TABLE foo(x INTEGER, y INTEGER);
INSERT INTO foo VALUES(1, 3);
END;";
db.execute_batch(sql).unwrap();
let mut stmt = db.prepare("SELECT y FROM foo").unwrap();
let y: Result<i64> = stmt.query_row(NO_PARAMS, |r| r.get("y"));
assert_eq!(3i64, y.unwrap());
}
#[test]
fn test_query_by_column_name_ignore_case() {
let db = Connection::open_in_memory().unwrap();
let sql = "BEGIN;
CREATE TABLE foo(x INTEGER, y INTEGER);
INSERT INTO foo VALUES(1, 3);
END;";
db.execute_batch(sql).unwrap();
let mut stmt = db.prepare("SELECT y as Y FROM foo").unwrap();
let y: Result<i64> = stmt.query_row(NO_PARAMS, |r| r.get("y"));
assert_eq!(3i64, y.unwrap());
}
#[test]
#[cfg(feature = "bundled")]
fn test_expanded_sql() {
let db = Connection::open_in_memory().unwrap();
let stmt = db.prepare("SELECT ?").unwrap();
stmt.bind_parameter(&1, 1).unwrap();
assert_eq!(Some("SELECT 1".to_owned()), stmt.expanded_sql());
}
#[test]
fn test_bind_parameters() {
let db = Connection::open_in_memory().unwrap();
// dynamic slice:
db.query_row(
"SELECT ?1, ?2, ?3",
&[&1u8 as &dyn ToSql, &"one", &Some("one")],
|row| row.get::<_, u8>(0),
)
.unwrap();
// existing collection:
let data = vec![1, 2, 3];
db.query_row("SELECT ?1, ?2, ?3", &data, |row| row.get::<_, u8>(0))
.unwrap();
db.query_row("SELECT ?1, ?2, ?3", data.as_slice(), |row| {
row.get::<_, u8>(0)
})
.unwrap();
db.query_row("SELECT ?1, ?2, ?3", data, |row| row.get::<_, u8>(0))
.unwrap();
use std::collections::BTreeSet;
let data: BTreeSet<String> = ["one", "two", "three"]
.iter()
.map(|s| s.to_string())
.collect();
db.query_row("SELECT ?1, ?2, ?3", &data, |row| row.get::<_, String>(0))
.unwrap();
let data = [0; 3];
db.query_row("SELECT ?1, ?2, ?3", &data, |row| row.get::<_, u8>(0))
.unwrap();
db.query_row("SELECT ?1, ?2, ?3", data.iter(), |row| row.get::<_, u8>(0))
.unwrap();
}
}