Replace row changes/count type (i32) with usize

Breaking change

src/error.rs

@@ -62,7 +62,7 @@ pub enum Error {
     InvalidColumnType(usize, Type),
 
     /// Error when a query that was expected to insert one row did not insert any or insert many.
-    StatementChangedRows(c_int),
+    StatementChangedRows(usize),
 
     /// Error returned by `functions::Context::get` when the function argument cannot be converted
     /// to the requested type.

src/lib.rs

@@ -305,7 +305,7 @@ impl Connection {
     ///
     /// Will return `Err` if `sql` cannot be converted to a C-compatible string or if the
     /// underlying SQLite call fails.
-    pub fn execute(&self, sql: &str, params: &[&ToSql]) -> Result<c_int> {
+    pub fn execute(&self, sql: &str, params: &[&ToSql]) -> Result<usize> {
         self.prepare(sql)
             .and_then(|mut stmt| stmt.execute(params))
     }
@@ -319,7 +319,7 @@ impl Connection {
     ///
     /// ```rust,no_run
     /// # use rusqlite::{Connection, Result};
-    /// fn insert(conn: &Connection) -> Result<i32> {
+    /// fn insert(conn: &Connection) -> Result<usize> {
     ///     conn.execute_named("INSERT INTO test (name) VALUES (:name)", &[(":name", &"one")])
     /// }
     /// ```
@@ -328,7 +328,7 @@ impl Connection {
     ///
     /// Will return `Err` if `sql` cannot be converted to a C-compatible string or if the
     /// underlying SQLite call fails.
-    pub fn execute_named(&self, sql: &str, params: &[(&str, &ToSql)]) -> Result<c_int> {
+    pub fn execute_named(&self, sql: &str, params: &[(&str, &ToSql)]) -> Result<usize> {
         self.prepare(sql)
             .and_then(|mut stmt| stmt.execute_named(params))
     }
@@ -570,7 +570,7 @@ impl Connection {
         self.db.borrow_mut().decode_result(code)
     }
 
-    fn changes(&self) -> c_int {
+    fn changes(&self) -> usize {
         self.db.borrow_mut().changes()
     }
 
@@ -911,8 +911,8 @@ impl InnerConnection {
         })
     }
 
-    fn changes(&mut self) -> c_int {
-        unsafe { ffi::sqlite3_changes(self.db()) }
+    fn changes(&mut self) -> usize {
+        unsafe { ffi::sqlite3_changes(self.db()) as usize }
     }
 
     fn is_autocommit(&self) -> bool {

src/statement.rs

@@ -75,7 +75,7 @@ impl<'conn> Statement<'conn> {
     ///
     /// 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(&mut self, params: &[&ToSql]) -> Result<c_int> {
+    pub fn execute(&mut self, params: &[&ToSql]) -> Result<usize> {
         try!(self.bind_parameters(params));
         self.execute_with_bound_parameters()
     }
@@ -92,7 +92,7 @@ impl<'conn> Statement<'conn> {
     ///
     /// ```rust,no_run
     /// # use rusqlite::{Connection, Result};
-    /// fn insert(conn: &Connection) -> Result<i32> {
+    /// fn insert(conn: &Connection) -> Result<usize> {
     ///     let mut stmt = try!(conn.prepare("INSERT INTO test (name) VALUES (:name)"));
     ///     stmt.execute_named(&[(":name", &"one")])
     /// }
@@ -102,7 +102,7 @@ impl<'conn> Statement<'conn> {
     ///
     /// 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, &ToSql)]) -> Result<c_int> {
+    pub fn execute_named(&mut self, params: &[(&str, &ToSql)]) -> Result<usize> {
         try!(self.bind_parameters_named(params));
         self.execute_with_bound_parameters()
     }
@@ -445,7 +445,7 @@ impl<'conn> Statement<'conn> {
                            })
     }
 
-    fn execute_with_bound_parameters(&mut self) -> Result<c_int> {
+    fn execute_with_bound_parameters(&mut self) -> Result<usize> {
         let r = self.stmt.step();
         self.stmt.reset();
         match r {

src/types/mod.rs

@@ -77,10 +77,9 @@ mod serde_json;
 /// # extern crate rusqlite;
 /// # use rusqlite::{Connection, Result};
 /// # use rusqlite::types::{Null};
-/// # use std::os::raw::{c_int};
 /// fn main() {
 /// }
-/// fn insert_null(conn: &Connection) -> Result<c_int> {
+/// fn insert_null(conn: &Connection) -> Result<usize> {
 ///     conn.execute("INSERT INTO people (name) VALUES (?)", &[&Null])
 /// }
 /// ```