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7ea54db430
These are needed to distinguish columns from different tables with the same column name in one and the same (joined) Tuple. Not quite happy yet with this API; I think some sort of hierarchical structure would be better but we'll burn that bridge when we get there :^)
147 lines
4.1 KiB
C++
147 lines
4.1 KiB
C++
/*
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* Copyright (c) 2021, Jan de Visser <jan@de-visser.net>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/Badge.h>
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#include <AK/ByteBuffer.h>
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#include <AK/ScopeGuard.h>
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#include <AK/String.h>
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#include <AK/Variant.h>
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#include <LibSQL/Forward.h>
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#include <LibSQL/TupleDescriptor.h>
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#include <LibSQL/Type.h>
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#include <LibSQL/ValueImpl.h>
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#include <string.h>
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namespace SQL {
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/**
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* A `Value` is an atomic piece of SQL data`. A `Value` has a basic type
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* (Text/String, Integer, Float, etc). Richer types are implemented in higher
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* level layers, but the resulting data is stored in these `Value` objects.
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*/
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class Value {
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public:
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Value(Value&) = default;
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Value(Value const&) = default;
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explicit Value(SQLType sql_type = SQLType::Null);
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template<typename... Ts>
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explicit Value(Variant<Ts...> impl)
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: m_impl(impl)
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{
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}
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enum SetImplementation {
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SetImplementationSingleton
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};
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template<typename I>
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Value(SetImplementation, I&& impl)
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{
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m_impl.set<I>(forward<I>(impl));
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}
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Value(SQLType, Value const&);
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Value(SQLType, String const&);
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Value(SQLType, char const*);
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Value(SQLType, int);
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Value(SQLType, double);
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Value(SQLType, bool);
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explicit Value(String const&);
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explicit Value(char const*);
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explicit Value(int);
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explicit Value(u32);
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explicit Value(double);
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explicit Value(bool);
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~Value() = default;
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[[nodiscard]] bool is_null() const;
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[[nodiscard]] SQLType type() const;
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[[nodiscard]] String type_name() const;
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[[nodiscard]] BaseTypeImpl downcast_to_basetype() const;
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template<typename Impl>
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Impl const& get_impl(Badge<Impl>) const { return m_impl.get<Impl>(); }
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[[nodiscard]] String to_string() const;
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[[nodiscard]] Optional<int> to_int() const;
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[[nodiscard]] Optional<u32> to_u32() const;
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[[nodiscard]] Optional<double> to_double() const;
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[[nodiscard]] Optional<bool> to_bool() const;
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[[nodiscard]] Optional<Vector<Value>> to_vector() const;
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explicit operator String() const;
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explicit operator int() const;
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explicit operator u32() const;
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explicit operator double() const;
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explicit operator bool() const;
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void assign(Value const& other_value);
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void assign(String const& string_value);
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void assign(int int_value);
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void assign(u32 unsigned_int_value);
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void assign(double double_value);
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void assign(bool bool_value);
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void assign(Vector<Value> const& values);
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Value& operator=(Value const& other);
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Value& operator=(String const&);
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Value& operator=(char const*);
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Value& operator=(int);
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Value& operator=(u32);
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Value& operator=(double);
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Value& operator=(bool);
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Value& operator=(Vector<Value> const&);
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[[nodiscard]] size_t length() const;
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[[nodiscard]] u32 hash() const;
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[[nodiscard]] bool can_cast(Value const&) const;
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void serialize(Serializer&) const;
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void deserialize(Serializer&);
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[[nodiscard]] int compare(Value const&) const;
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bool operator==(Value const&) const;
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bool operator==(String const&) const;
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bool operator==(int) const;
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bool operator==(double) const;
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bool operator!=(Value const&) const;
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bool operator<(Value const&) const;
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bool operator<=(Value const&) const;
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bool operator>(Value const&) const;
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bool operator>=(Value const&) const;
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Value add(Value const&) const;
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Value subtract(Value const&) const;
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Value multiply(Value const&) const;
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Value divide(Value const&) const;
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Value modulo(Value const&) const;
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Value shift_left(Value const&) const;
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Value shift_right(Value const&) const;
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Value bitwise_or(Value const&) const;
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Value bitwise_and(Value const&) const;
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[[nodiscard]] TupleElementDescriptor descriptor() const
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{
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return { "", "", "", type(), Order::Ascending };
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}
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static Value const& null();
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static Value create_tuple(NonnullRefPtr<TupleDescriptor> const&);
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static Value create_array(SQLType element_type, Optional<size_t> const& max_size = {});
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private:
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void setup(SQLType type);
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ValueTypeImpl m_impl { NullImpl() };
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friend Serializer;
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};
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}
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