Add a Statement class to manage the sqlite3_stmt objects and avoid leaks

src/database/statement.hpp

@@ -0,0 +1,35 @@
+#pragma once
+
+#include <sqlite3.h>
+
+class Statement
+{
+ public:
+  Statement(sqlite3_stmt* stmt):
+      stmt(stmt) {}
+  ~Statement()
+  {
+    sqlite3_finalize(this->stmt);
+  }
+
+  Statement(const Statement&) = delete;
+  Statement& operator=(const Statement&) = delete;
+  Statement(Statement&& other):
+      stmt(other.stmt)
+  {
+    other.stmt = nullptr;
+  }
+  Statement& operator=(Statement&& other)
+  {
+    this->stmt = other.stmt;
+    other.stmt = nullptr;
+    return *this;
+  }
+  sqlite3_stmt* get()
+  {
+    return this->stmt;
+  }
+
+ private:
+  sqlite3_stmt* stmt;
+};