diff --git a/column.cpp b/column.cpp
index e7f083b..a3acc48 100644
--- a/column.cpp
+++ b/column.cpp
@@ -14,6 +14,8 @@ const char* column::name() const {
 	return sqlite3_column_name(stmt.raw(), idx);
 }
 
+#if defined(SQLITE_ENABLE_COLUMN_METADATA)
+
 const char* column::database_name() const {
 	return sqlite3_column_database_name(stmt.raw(), idx);
 }
@@ -26,6 +28,8 @@ const char* column::origin_name() const {
 	return sqlite3_column_origin_name(stmt.raw(), idx);
 }
 
+#endif
+
 int column::type() const {
 	return sqlite3_column_type(stmt.raw(), idx);
 }
diff --git a/column.hpp b/column.hpp
index 85c6a50..b9757d7 100644
--- a/column.hpp
+++ b/column.hpp
@@ -21,11 +21,13 @@ class column {
 	/** Wraps [`sqlite3_column_name()`](http://www.sqlite.org/c3ref/column_name.html) */
 	const char* name() const;
 	/** Wraps [`sqlite3_column_database_name()`](http://www.sqlite.org/c3ref/column_database_name.html) */
+#if defined(SQLITE_ENABLE_COLUMN_METADATA)
 	const char* database_name() const;
 	/** Wraps [`sqlite3_column_table_name()`](http://www.sqlite.org/c3ref/column_database_name.html) */
 	const char* table_name() const;
 	/** Wraps [`sqlite3_column_origin_name()`](http://www.sqlite.org/c3ref/column_database_name.html) */
 	const char* origin_name() const;
+#endif
 
 	// TODO: Better return type
 	/** Wraps [`sqlite3_column_type()`](http://www.sqlite.org/c3ref/column_blob.html) */
diff --git a/connection.cpp b/connection.cpp
index f8002b3..79b03bc 100644
--- a/connection.cpp
+++ b/connection.cpp
@@ -22,8 +22,7 @@ struct collation_data_t {
 
 namespace detail {
 
-class connection_callback_table {
-public:
+struct connection_callback_table {
 	std::unique_ptr<connection::commit_handler_t> commit_handler;
 	std::unique_ptr<connection::rollback_handler_t> rollback_handler;
 	std::unique_ptr<connection::update_handler_t> update_handler;
@@ -53,6 +52,11 @@ connection:: connection(const std::string &filename, int flags) : handle(nullptr
 	open(filename, flags);
 }
 
+connection::connection(connection&& other) noexcept
+    : handle(other.handle), callbacks(std::move(other.callbacks)) {
+	other.handle = nullptr;
+}
+
 connection::~connection() noexcept {
 	if (handle) {
 		close();
@@ -100,7 +104,7 @@ bool connection::autocommit() const {
 	return sqlite3_get_autocommit(handle);
 }
 
-uint64_t connection::last_insert_rowid() const {
+int64_t connection::last_insert_rowid() const {
 	return sqlite3_last_insert_rowid(handle);
 }
 
@@ -317,12 +321,12 @@ statement connection::prepare(const char *sql) {
 	int rv;
 	sqlite3_stmt *stmt = nullptr;
 
-	rv = sqlite3_prepare_v2(handle, sql, std::strlen(sql)+1, &stmt, nullptr);
+	rv = sqlite3_prepare_v2(handle, sql, int(std::strlen(sql)+1), &stmt, nullptr);
 	if (rv != SQLITE_OK) {
 		throw static_error(rv);
 	}
 
-	return statement(*this, stmt);
+	return statement(stmt);
 }
 
 statement connection::prepare(const std::string &sql) {
diff --git a/connection.hpp b/connection.hpp
index f2e1776..8f950ba 100644
--- a/connection.hpp
+++ b/connection.hpp
@@ -64,7 +64,7 @@ class connection {
 private:
 	sqlite3 *handle;
 
-	friend class detail::connection_callback_table;
+	friend struct detail::connection_callback_table;
 	std::unique_ptr<detail::connection_callback_table> callbacks;
 
 	// On-demand initialization of callback table
@@ -79,8 +79,13 @@ class connection {
 	// Don't copy, move
 	connection(const connection&) = delete;
 	connection& operator=(const connection&) = delete;
-	connection(connection&&) = default;
-	connection& operator=(connection&&) = default;
+
+	connection(connection&& other) noexcept;
+	connection& operator=(connection&& other) noexcept {
+		this->~connection();
+		return *::new (static_cast<void*>(this)) auto(
+		    std::move(other));
+	}
 
 	/**
 	 * The database file name.
@@ -132,7 +137,7 @@ class connection {
 	 */
 	bool autocommit() const;
 
-	uint64_t last_insert_rowid() const;
+	int64_t last_insert_rowid() const;
 
 	/**
 	 * Get the database connection status.
diff --git a/context.cpp b/context.cpp
index 946266c..a2c2854 100644
--- a/context.cpp
+++ b/context.cpp
@@ -57,13 +57,17 @@ void context::result(const char *value, bool copy) {
 
 template<>
 void context::result(const std::string &value, bool copy) {
-	sqlite3_result_text(handle, value.c_str(), value.length(), (copy ? SQLITE_TRANSIENT : SQLITE_STATIC));
+	sqlite3_result_text(handle, value.c_str(), int(value.size()), (copy ? SQLITE_TRANSIENT : SQLITE_STATIC));
 }
 
 template<>
 void context::result(const blob &value, bool copy) {
 	if (value.data) {
+#if !defined(sqlite3_result_blob)
 		sqlite3_result_blob(handle, value.data, value.length, (copy ? SQLITE_TRANSIENT : SQLITE_STATIC));
+#else
+		sqlite3_result_blob64(handle, value.data, unsigned(value.length), (copy ? SQLITE_TRANSIENT : SQLITE_STATIC));
+#endif
 	}
 	else {
 		sqlite3_result_zeroblob(handle, value.length);
diff --git a/context.hpp b/context.hpp
index 87a9765..aa9aac3 100644
--- a/context.hpp
+++ b/context.hpp
@@ -12,7 +12,7 @@ namespace sqxx {
 
 // Aggregate function interoperability
 namespace detail {
-	class aggregate_data;
+	struct aggregate_data;
 }
 
 /** Wraps `struct sqlite3_context` */
@@ -90,7 +90,7 @@ class context {
 
 private:
 	// This is used internally by our aggregate functions
-	friend class detail::aggregate_data;
+	friend struct detail::aggregate_data;
 	void* aggregate_context(int bytes);
 
 public:
diff --git a/global.cpp b/global.cpp
index ee536a5..5650f02 100644
--- a/global.cpp
+++ b/global.cpp
@@ -97,11 +97,11 @@ bool complete(const std::string &sql) {
 	return complete(sql.c_str());
 }
 
-uint64_t memory_used() {
+int64_t memory_used() {
 	return sqlite3_memory_used();
 }
 
-uint64_t memory_highwater(bool reset) {
+int64_t memory_highwater(bool reset) {
 	return sqlite3_memory_highwater(reset);
 }
 
diff --git a/global.hpp b/global.hpp
index 047fe94..ce91296 100644
--- a/global.hpp
+++ b/global.hpp
@@ -97,14 +97,14 @@ bool complete(const std::string &sql);
  *
  * Wraps [`sqlite3_memory_used()`](http://www.sqlite.org/c3ref/memory_highwater.html)
  */
-uint64_t memory_used();
+int64_t memory_used();
 
 /**
  * Memory allocator statistics
  *
  * Wraps [`sqlite3_memory_highwater()`](http://www.sqlite.org/c3ref/memory_highwater.html)
  */
-uint64_t memory_highwater(bool reset=false);
+int64_t memory_highwater(bool reset=false);
 
 /**
  * Pseuso-random number generator
diff --git a/statement.cpp b/statement.cpp
index e655362..3abba7e 100644
--- a/statement.cpp
+++ b/statement.cpp
@@ -9,8 +9,8 @@
 
 namespace sqxx {
 
-statement::statement(connection &conn_arg, sqlite3_stmt *handle_arg)
-		: handle(handle_arg), conn(conn_arg), completed(true) {
+statement::statement(sqlite3_stmt *handle_arg)
+    : handle(handle_arg), completed(true) {
 }
 
 statement::~statement() {
@@ -115,7 +115,7 @@ void statement::bind<const char*>(int idx, const char *value, bool copy) {
 
 template<>
 void statement::bind<std::string>(int idx, const std::string &value, bool copy) {
-	int rv = sqlite3_bind_text(handle, idx+1, value.c_str(), value.length(), (copy ? SQLITE_TRANSIENT : SQLITE_STATIC));
+	int rv = sqlite3_bind_text(handle, idx+1, value.c_str(), int(value.size()), (copy ? SQLITE_TRANSIENT : SQLITE_STATIC));
 	if (rv != SQLITE_OK)
 		throw static_error(rv);
 }
@@ -123,7 +123,11 @@ void statement::bind<std::string>(int idx, const std::string &value, bool copy)
 template<>
 void statement::bind<blob>(int idx, const blob &value, bool copy) {
 	if (value.data) {
+#if !defined(sqlite3_bind_blob)
 		int rv = sqlite3_bind_blob(handle, idx+1, value.data, value.length, (copy ? SQLITE_TRANSIENT : SQLITE_STATIC));
+#else
+		int rv = sqlite3_bind_blob64(handle, idx+1, value.data, unsigned(value.length), (copy ? SQLITE_TRANSIENT : SQLITE_STATIC));
+#endif
 		if (rv != SQLITE_OK)
 			throw static_error(rv);
 	}
@@ -168,16 +172,16 @@ template<>
 std::string statement::val<std::string>(int idx) const {
 	// Correct order to call functions according to http://www.sqlite.org/c3ref/column_blob.html
 	const unsigned char* text = sqlite3_column_text(handle, idx);
-	int bytes = sqlite3_column_bytes(handle, idx);
-	return std::string(reinterpret_cast<const char*>(text), bytes);
+	auto bytes = sqlite3_column_bytes(handle, idx);
+	return std::string(reinterpret_cast<const char*>(text), size_t(bytes));
 }
 
 template<>
 blob statement::val<blob>(int idx) const {
 	// Correct order to call functions according to http://www.sqlite.org/c3ref/column_blob.html
 	const void *data = sqlite3_column_blob(handle, idx);
-	int bytes = sqlite3_column_bytes(handle, idx);
-	return blob(data, bytes);
+	auto bytes = sqlite3_column_bytes(handle, idx);
+	return blob(data, int(bytes));
 }
 
 
diff --git a/statement.hpp b/statement.hpp
index f196c40..5ba4d7a 100644
--- a/statement.hpp
+++ b/statement.hpp
@@ -31,27 +31,24 @@ class statement {
 private:
 	sqlite3_stmt *handle;
 
-public:
-	connection &conn;
-
 protected:
 	bool completed;
 
 public:
+	statement() noexcept : handle(nullptr), completed(false) {
+	}
+
 	/**
-	 * Constructs a statement object from a connection object and a C API
-	 * statement handle.
+	 * Constructs a statement object from a C API statement handle.
 	 *
 	 * Usually not called directly, use `connection::prepare()` instead.
-	 *
-	 * @conn_arg The connection object associated with the statement. A reference
-	 * is stored and the connection object must stay alive until the constructed
-	 * `statement` is destroyed.
+	 * The connection object associated with the statement must stay alive
+	 * until the `statement` is destroyed.
 	 *
 	 * @handle_arg A C API statement handle. The constructed `statement` takes
 	 * ownership of the C API handle and will close it on destruction.
 	 */
-	statement(connection &conn_arg, sqlite3_stmt *handle_arg);
+	explicit statement(sqlite3_stmt *handle_arg);
 	/*
 	 * Destroys the object, closing the managed C API handle, if necessary.
 	 */
@@ -61,10 +58,19 @@ class statement {
 	statement(const statement &) = delete;
 	/** Copy assignment is disabled */
 	statement& operator=(const statement&) = delete;
+
 	/** Move construction is enabled */
-	statement(statement &&) = default;
+	statement(statement&& other) noexcept
+	    : handle(other.handle), completed(other.completed) {
+		other.handle = nullptr;
+	}
+
 	/** Move assignment is enabled */
-	statement& operator=(statement&&) = default;
+	statement& operator=(statement&& other) noexcept {
+		this->~statement();
+		return *::new (static_cast<void*>(this)) auto(
+		    std::move(other));
+	}
 
 
 	/**
@@ -318,7 +324,7 @@ class statement {
 
 	/** Check if all result rows have been processed */
 	bool done() const { return completed; }
-	operator bool() const { return !completed; }
+	explicit operator bool() const { return !completed; }
 
 	class row_iterator : public std::iterator<std::input_iterator_tag, size_t> {
 	private:
diff --git a/value.cpp b/value.cpp
index 2c1b04d..c9c94d4 100644
--- a/value.cpp
+++ b/value.cpp
@@ -38,16 +38,16 @@ template<>
 std::string value::val<std::string>() const {
 	// Correct order to call functions according to http://www.sqlite.org/c3ref/column_blob.html
 	const unsigned char *text = sqlite3_value_text(handle);
-	int bytes = sqlite3_value_bytes(handle);
-	return std::string(reinterpret_cast<const char*>(text), bytes);
+	auto bytes = sqlite3_value_bytes(handle);
+	return std::string(reinterpret_cast<const char*>(text), size_t(bytes));
 }
 
 template<>
 blob value::val<blob>() const {
 	// Correct order to call functions according to http://www.sqlite.org/c3ref/column_blob.html
 	const void *data = sqlite3_value_blob(handle);
-	int len = sqlite3_value_bytes(handle);
-	return blob(data, len);
+	auto len = sqlite3_value_bytes(handle);
+	return blob(data, int(len));
 }
 
 value::operator int() const { return val<int>(); }