2015-08-05 03:48:54 +08:00
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//use std::collections::HashMap;
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use std::ffi::{CString};
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use libc::{c_int};
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use super::ffi;
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2015-08-07 08:19:57 +08:00
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use {SqliteResult, SqliteError, SqliteConnection, SqliteStatement, SqliteRows, SqliteRow};
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2015-08-05 03:48:54 +08:00
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use types::{ToSql};
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impl SqliteConnection {
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2015-08-07 08:19:57 +08:00
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/// Convenience method to prepare and execute a single SQL statement with named parameter(s).
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pub fn execute_named(&self, sql: &str, params: &[(&str, &ToSql)]) -> SqliteResult<c_int> {
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self.prepare(sql).and_then(|mut stmt| stmt.execute_named(params))
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}
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/// Convenience method to execute a query with named parameter(s) that is expected to return a single row.
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///
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/// If the query returns more than one row, all rows except the first are ignored.
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pub fn query_named_row<T, F>(&self, sql: &str, params: &[(&str, &ToSql)], f: F) -> SqliteResult<T>
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where F: FnOnce(SqliteRow) -> T {
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let mut stmt = try!(self.prepare(sql));
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let mut rows = try!(stmt.query_named(params));
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match rows.next() {
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Some(row) => row.map(f),
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None => Err(SqliteError{
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code: ffi::SQLITE_NOTICE,
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message: "Query did not return a row".to_string(),
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})
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}
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}
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2015-08-05 03:48:54 +08:00
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}
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impl<'conn> SqliteStatement<'conn> {
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/*pub fn parameter_names(&self) -> HashMap<String, i32> {
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let n = unsafe { ffi::sqlite3_bind_parameter_count(self.stmt) };
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let mut index_by_name = HashMap::with_capacity(n as usize);
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for i in 1..n+1 {
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let c_name = unsafe { ffi::sqlite3_bind_parameter_name(self.stmt, i) };
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if !c_name.is_null() {
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let c_slice = unsafe { CStr::from_ptr(c_name).to_bytes() };
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index_by_name.insert(str::from_utf8(c_slice).unwrap().to_string(), n);
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}
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}
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index_by_name
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}*/
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/// Return the index of an SQL parameter given its name.
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2015-08-08 22:19:05 +08:00
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///
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/// ## Failures
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2015-08-05 03:48:54 +08:00
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/// Return None if `name` is invalid (NulError) or if no matching parameter is found.
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pub fn parameter_index(&self, name: &str) -> Option<i32> {
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unsafe {
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CString::new(name).ok().and_then(|c_name|
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match ffi::sqlite3_bind_parameter_index(self.stmt, c_name.as_ptr()) {
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0 => None, // A zero is returned if no matching parameter is found.
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n => Some(n)
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}
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)
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}
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}
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/// Execute the prepared statement with named parameter(s).
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///
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/// On success, returns the number of rows that were changed or inserted or deleted (via
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/// `sqlite3_changes`).
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2015-08-07 08:19:57 +08:00
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pub fn execute_named(&mut self, params: &[(&str, &ToSql)]) -> SqliteResult<c_int> {
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2015-08-05 03:48:54 +08:00
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unsafe {
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2015-08-06 04:07:49 +08:00
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try!(self.bind_named_parameters(params));
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2015-08-05 03:48:54 +08:00
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self.execute_()
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}
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}
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2015-08-06 04:07:49 +08:00
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/// Execute the prepared statement with named parameter(s), returning an iterator over the resulting rows.
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2015-08-07 08:19:57 +08:00
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pub fn query_named<'a>(&'a mut self, params: &[(&str, &ToSql)]) -> SqliteResult<SqliteRows<'a>> {
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2015-08-06 04:07:49 +08:00
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self.reset_if_needed();
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unsafe {
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try!(self.bind_named_parameters(params));
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}
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self.needs_reset = true;
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Ok(SqliteRows::new(self))
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}
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unsafe fn bind_named_parameters(&mut self, params: &[(&str, &ToSql)]) -> SqliteResult<()> {
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for &(name, value) in params {
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let i = try!(self.parameter_index(name).ok_or(SqliteError{
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code: ffi::SQLITE_MISUSE,
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message: format!("Invalid parameter name: {}", name)
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}));
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try!(self.conn.decode_result(value.bind_parameter(self.stmt, i)));
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}
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Ok(())
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}
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2015-08-05 03:48:54 +08:00
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}
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#[cfg(test)]
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mod test {
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use SqliteConnection;
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2015-08-07 08:19:57 +08:00
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#[test]
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fn test_execute_named() {
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let db = SqliteConnection::open_in_memory().unwrap();
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db.execute_batch("CREATE TABLE foo(x INTEGER)").unwrap();
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assert_eq!(db.execute_named("INSERT INTO foo(x) VALUES (:x)", &[(":x", &1i32)]).unwrap(), 1);
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assert_eq!(db.execute_named("INSERT INTO foo(x) VALUES (:x)", &[(":x", &2i32)]).unwrap(), 1);
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assert_eq!(3i32, db.query_named_row("SELECT SUM(x) FROM foo WHERE x > :x", &[(":x", &0i32)], |r| r.get(0)).unwrap());
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}
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2015-08-05 03:48:54 +08:00
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#[test]
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2015-08-07 08:19:57 +08:00
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fn test_stmt_execute_named() {
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2015-08-05 03:48:54 +08:00
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let db = SqliteConnection::open_in_memory().unwrap();
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let sql = "CREATE TABLE test (id INTEGER PRIMARY KEY NOT NULL, name TEXT NOT NULL, flag INTEGER)";
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db.execute_batch(sql).unwrap();
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let mut stmt = db.prepare("INSERT INTO test (id, name, flag) VALUES (:id, :name, :flag)").unwrap();
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2015-08-07 08:19:57 +08:00
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stmt.execute_named(&[(":name", &"one")]).unwrap();
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2015-08-05 03:48:54 +08:00
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}
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2015-08-06 04:07:49 +08:00
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#[test]
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2015-08-07 08:19:57 +08:00
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fn test_query_named() {
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2015-08-06 04:07:49 +08:00
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let db = SqliteConnection::open_in_memory().unwrap();
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let sql = "CREATE TABLE test (id INTEGER PRIMARY KEY NOT NULL, name TEXT NOT NULL, flag INTEGER)";
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db.execute_batch(sql).unwrap();
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let mut stmt = db.prepare("SELECT * FROM test where name = :name").unwrap();
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2015-08-07 08:19:57 +08:00
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stmt.query_named(&[(":name", &"one")]).unwrap();
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2015-08-06 04:07:49 +08:00
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}
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2015-08-05 03:48:54 +08:00
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}
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