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Refactor hangover

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This commit is contained in:
Robert McRackan 2022-08-01 11:59:55 -04:00
parent 553a936e7e
commit a3df85c87e
23 changed files with 241 additions and 276 deletions
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14
Source/HangoverAvalonia/HangoverAvalonia.csproj
View file

@ -20,6 +20,16 @@
<ApplicationIcon>hangover.ico</ApplicationIcon>
</PropertyGroup>
<PropertyGroup>
<!--
HACK FOR COMPILER BUG 2021-09-14. Hopefully will be fixed in future versions
- Not using SatelliteResourceLanguages will load all language packs: works
- Specifying 'en' semicolon 1 more should load 1 language pack: works
- Specifying only 'en' should load no language packs: broken, still loads all
-->
<SatelliteResourceLanguages>en;es</SatelliteResourceLanguages>
</PropertyGroup>
<PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|AnyCPU'">
<OutputPath>..\bin\Avalonia\Debug</OutputPath>
<DebugType>embedded</DebugType>
@ -61,9 +71,7 @@
<PackageReference Include="XamlNameReferenceGenerator" Version="1.3.4" />
</ItemGroup>
<ItemGroup>
<ProjectReference Include="..\ApplicationServices\ApplicationServices.csproj" />
<ProjectReference Include="..\AppScaffolding\AppScaffolding.csproj" />
<ProjectReference Include="..\FileLiberator\FileLiberator.csproj" />
<ProjectReference Include="..\HangoverBase\HangoverBase.csproj" />
</ItemGroup>

135
Source/HangoverAvalonia/ViewModels/MainWindowViewModel.cs
View file

@ -1,17 +1,13 @@
using ApplicationServices;
using AppScaffolding;
using Microsoft.EntityFrameworkCore;
using ReactiveUI;
using System;
using System.Collections.Generic;
using System.IO;
using System.Text;
using HangoverBase;
using ReactiveUI;
namespace HangoverAvalonia.ViewModels
{
public class MainWindowViewModel : ViewModelBase
{
private string dbFile;
private DatabaseTab _tab;
private string _databaseFileText;
private bool _databaseFound;
private string _sqlResults;
@ -22,129 +18,20 @@ namespace HangoverAvalonia.ViewModels
public MainWindowViewModel()
{
dbFile = UNSAFE_MigrationHelper.DatabaseFile;
if (dbFile is null)
_tab = new(new(() => SqlQuery, s => SqlResults = s, s => SqlResults = s));
_tab.LoadDatabaseFile();
if (_tab.DbFile is null)
{
DatabaseFileText = $"Database file not found";
DatabaseFound = false;
return;
}
DatabaseFileText = $"Database file: {UNSAFE_MigrationHelper.DatabaseFile ?? "not found"}";
DatabaseFound = UNSAFE_MigrationHelper.DatabaseFile is not null;
DatabaseFileText = $"Database file: {_tab.DbFile}";
DatabaseFound = true;
}
public void ExecuteQuery()
{
ensureBackup();
SqlResults = string.Empty;
try
{
var sql = SqlQuery.Trim();
#region // explanation
// Routing statements to non-query is a convenience.
// I went down the rabbit hole of full parsing and it's more trouble than it's worth. The parsing is easy due to available libraries. The edge cases of what to do next got too complex for slight gains.
// It's also not useful to take the extra effort to separate non-queries which don't return a row count. Eg: alter table, drop table
// My half-assed solution here won't even catch simple mistakes like this -- and that's ok
// -- line 1 is a comment
// delete from foo
#endregion
var lower = sql.ToLower();
if (lower.StartsWith("update") || lower.StartsWith("insert") || lower.StartsWith("delete"))
nonQuery(sql);
else
query(sql);
}
catch (Exception ex)
{
SqlResults = $"{ex.Message}\r\n{ex.StackTrace}";
}
finally
{
deleteUnneededBackups();
}
}
private string dbBackup;
private DateTime dbFileLastModified;
private void ensureBackup()
{
if (dbBackup is not null)
return;
dbFileLastModified = File.GetLastWriteTimeUtc(dbFile);
dbBackup
= Path.ChangeExtension(dbFile, "").TrimEnd('.')
+ $"_backup_{DateTime.UtcNow:O}".Replace(':', '-').Replace('.', '-')
+ Path.GetExtension(dbFile);
File.Copy(dbFile, dbBackup);
}
private void deleteUnneededBackups()
{
var newLastModified = File.GetLastWriteTimeUtc(dbFile);
if (dbFileLastModified == newLastModified)
{
File.Delete(dbBackup);
dbBackup = null;
}
}
void query(string sql)
{
// ef doesn't support truly generic queries. have to drop down to ado.net
using var context = DbContexts.GetContext();
using var conn = context.Database.GetDbConnection();
conn.Open();
using var cmd = conn.CreateCommand();
cmd.CommandText = sql;
var reader = cmd.ExecuteReader();
var results = 0;
var builder = new StringBuilder();
var lines = 0;
while (reader.Read())
{
results++;
for (var i = 0; i < reader.FieldCount; i++)
builder.Append(reader.GetValue(i) + "\t");
builder.AppendLine();
lines++;
if (lines % 10 == 0)
{
SqlResults += builder.ToString();
builder.Clear();
}
}
SqlResults += builder.ToString();
builder.Clear();
if (results == 0)
SqlResults = "[no results]";
else
{
SqlResults += $"\r\n{results} result";
if (results != 1) SqlResults += "s";
}
}
void nonQuery(string sql)
{
using var context = DbContexts.GetContext();
var results = context.Database.ExecuteSqlRaw(sql);
SqlResults += $"{results} record";
if (results != 1) SqlResults += "s";
SqlResults += " affected";
}
public void ExecuteQuery() => _tab.ExecuteQuery();
}
}