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SQLiteMetadataTable.h (2831B)

      1 // Copyright (c) Microsoft Corporation.
      2 // Licensed under the MIT License.
      3 #pragma once
      4 #include <winget/SQLiteWrapper.h>
      5 
      6 #include <wil/result_macros.h>
      7 #include <string_view>
      8 
      9 namespace AppInstaller::SQLite
     10 {
     11     using namespace std::string_view_literals;
     12 
     13     static constexpr std::string_view s_MetadataValueName_DatabaseIdentifier = "databaseIdentifier"sv;
     14     static constexpr std::string_view s_MetadataValueName_MajorVersion = "majorVersion"sv;
     15     static constexpr std::string_view s_MetadataValueName_MinorVersion = "minorVersion"sv;
     16     static constexpr std::string_view s_MetadataValueName_LastWriteTime = "lastwritetime"sv;
     17 
     18     // The metadata table for the database.
     19     // Contains a fixed-schema set of named values that can be used to determine how to read the rest of the database.
     20     struct MetadataTable
     21     {
     22         static void Create(Connection& connection);
     23 
     24         // Gets the named value from the metadata table, interpreting it as the given type.
     25         template <typename Value>
     26         static Value GetNamedValue(const Connection& connection, std::string_view name)
     27         {
     28             Statement statement = GetNamedValueStatement(connection, name);
     29             return statement.GetColumn<Value>(0);
     30         }
     31 
     32         // Gets the named value from the metadata table, interpreting it as the given type.
     33         // Returns nullopt if the value is not present.
     34         template <typename Value>
     35         static std::optional<Value> TryGetNamedValue(const Connection& connection, std::string_view name)
     36         {
     37             std::optional<Statement> statement = TryGetNamedValueStatement(connection, name);
     38             if (statement)
     39             {
     40                 return statement->GetColumn<Value>(0);
     41             }
     42             else
     43             {
     44                 return std::nullopt;
     45             }
     46         }
     47 
     48         // Sets the named value into the metadata table.
     49         template <typename Value>
     50         static void SetNamedValue(const Connection& connection, std::string_view name, Value&& v)
     51         {
     52             Statement statement = SetNamedValueStatement(connection, name);
     53             statement.Bind(2, std::forward<Value>(v));
     54             statement.Execute();
     55         }
     56 
     57     private:
     58         // Internal function that gets the named value.
     59         static Statement GetNamedValueStatement(const Connection& connection, std::string_view name);
     60 
     61         // Internal function that gets the named value, or nullopt if it is not present.
     62         static std::optional<Statement> TryGetNamedValueStatement(const Connection& connection, std::string_view name);
     63 
     64         // Internal function that sets the named value.
     65         static Statement SetNamedValueStatement(const Connection& connection, std::string_view name);
     66     };
     67 }