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admin777
2026-05-21 15:52:36 +08:00
commit e3fe965f10
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Avalonia-EFCore/Database/AppDataContext.cs
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using Avalonia_EFCore.Models;
using Microsoft.EntityFrameworkCore;
namespace Avalonia_EFCore.Database
{
/// <summary>
/// 应用数据库上下文 —— 继承自 Avalonia-EFCore 的 AppDbContext。
/// 所有业务实体在此注册 DbSet。
/// 这是 Avalonia-API 和 Avalonia-PC 共用的具体数据上下文。
/// </summary>
public class AppDataContext(DatabaseConfiguration dbConfig) : AppDbContext(dbConfig)
{
/// <summary>天气预报数据</summary>
public DbSet<WeatherForecastEntity> WeatherForecasts => Set<WeatherForecastEntity>();
/// <summary>用户数据</summary>
public DbSet<UserEntity> Users => Set<UserEntity>();
/// <summary>API refresh token 数据</summary>
public DbSet<ApiRefreshTokenEntity> ApiRefreshTokens => Set<ApiRefreshTokenEntity>();
/// <summary>
/// 配置实体映射，包括主键、索引和属性约束。
/// </summary>
/// <param name="modelBuilder">模型构建器。</param>
protected override void OnModelCreating(ModelBuilder modelBuilder)
{
base.OnModelCreating(modelBuilder);
modelBuilder.Entity<WeatherForecastEntity>(entity =>
{
entity.HasKey(e => e.Id).HasName("pk-weather-forecast");
entity.Property(e => e.Summary).HasMaxLength(200);
});
modelBuilder.Entity<UserEntity>(entity =>
{
entity.HasKey(e => e.Id).HasName("pk-user");
entity.Property(e => e.Email).HasMaxLength(200);
});
modelBuilder.Entity<ApiRefreshTokenEntity>(entity =>
{
entity.HasKey(e => e.Id).HasName("pk-api-refresh-token");
entity.HasIndex(e => e.TokenHash).IsUnique().HasDatabaseName("idx-api-refresh-token-hash");
entity.HasIndex(e => e.UserId).HasDatabaseName("idx-api-refresh-token-user-id");
});
}
}
}
Avalonia-EFCore/Database/AppDataContextFactory.cs
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using Microsoft.EntityFrameworkCore.Design;
namespace Avalonia_EFCore.Database
{
/// <summary>
/// 设计时 DbContext 工厂，用于 EF Core 迁移工具生成迁移代码。
/// </summary>
public class AppDataContextFactory : IDesignTimeDbContextFactory<AppDataContext>
{
/// <summary>
/// 创建用于设计时的 AppDataContext 实例，默认使用 SQLite 提供程序。
/// </summary>
/// <param name="args">命令行参数。</param>
/// <returns>配置好的数据上下文实例。</returns>
public AppDataContext CreateDbContext(string[] args)
{
return new AppDataContext(DesignTimeDatabaseConfiguration.Create(args));
}
}
/// <summary>
/// SQLite 迁移设计时工厂。
/// </summary>
public sealed class SqliteAppDataContextFactory : IDesignTimeDbContextFactory<SqliteAppDataContext>
{
/// <inheritdoc />
public SqliteAppDataContext CreateDbContext(string[] args)
=> new(DesignTimeDatabaseConfiguration.Create(args, DatabaseProvider.SQLite));
}
/// <summary>
/// SQL Server 迁移设计时工厂。
/// </summary>
public sealed class SqlServerAppDataContextFactory : IDesignTimeDbContextFactory<SqlServerAppDataContext>
{
/// <inheritdoc />
public SqlServerAppDataContext CreateDbContext(string[] args)
=> new(DesignTimeDatabaseConfiguration.Create(args, DatabaseProvider.SqlServer));
}
/// <summary>
/// PostgreSQL 迁移设计时工厂。
/// </summary>
public sealed class PostgreSqlAppDataContextFactory : IDesignTimeDbContextFactory<PostgreSqlAppDataContext>
{
/// <inheritdoc />
public PostgreSqlAppDataContext CreateDbContext(string[] args)
=> new(DesignTimeDatabaseConfiguration.Create(args, DatabaseProvider.PostgreSQL));
}
/// <summary>
/// MySQL 迁移设计时工厂。
/// </summary>
public sealed class MySqlAppDataContextFactory : IDesignTimeDbContextFactory<MySqlAppDataContext>
{
/// <inheritdoc />
public MySqlAppDataContext CreateDbContext(string[] args)
=> new(DesignTimeDatabaseConfiguration.Create(args, DatabaseProvider.MySQL));
}
internal static class DesignTimeDatabaseConfiguration
{
public static DatabaseConfiguration Create(string[] args, DatabaseProvider defaultProvider = DatabaseProvider.SQLite)
{
DatabaseProviderRegistry.RegisterDefaults();
var provider = GetProvider(args) ?? defaultProvider;
return provider switch
{
DatabaseProvider.SQLite => DatabaseConfiguration.ForSQLite("avalonia-api.db"),
DatabaseProvider.SqlServer => DatabaseConfiguration.ForSqlServer("(localdb)\\MSSQLLocalDB", "AvaloniaApi"),
DatabaseProvider.PostgreSQL => DatabaseConfiguration.ForPostgreSQL("localhost", "avalonia_api", "postgres", "postgres"),
DatabaseProvider.MySQL => DatabaseConfiguration.ForMySQL("localhost", "avalonia_api", "root", "root"),
_ => DatabaseConfiguration.ForSQLite("avalonia-api.db"),
};
}
private static DatabaseProvider? GetProvider(string[] args)
{
for (var i = 0; i < args.Length; i++)
{
var arg = args[i];
string? value = null;
if (arg.Equals("--provider", StringComparison.OrdinalIgnoreCase) && i + 1 < args.Length)
{
value = args[i + 1];
}
else if (arg.StartsWith("--provider=", StringComparison.OrdinalIgnoreCase))
{
value = arg["--provider=".Length..];
}
if (!string.IsNullOrWhiteSpace(value)
&& Enum.TryParse<DatabaseProvider>(value, ignoreCase: true, out var provider))
{
return provider;
}
}
return null;
}
}
}
Avalonia-EFCore/Database/AppDbContext.cs
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using Microsoft.EntityFrameworkCore;
using System;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
namespace Avalonia_EFCore.Database
{
/// <summary>
/// 应用数据库上下文基类 —— 自动根据 DatabaseConfiguration 选择数据库提供程序。
/// 所有业务 DbContext 继承此类即可获得多数据库支持。
/// </summary>
public abstract class AppDbContext(DatabaseConfiguration dbConfig) : DbContext
{
/// <summary>
/// 数据库配置。
/// </summary>
private readonly DatabaseConfiguration _dbConfig = dbConfig;
/// <summary>
/// 配置数据库提供程序和连接选项。
/// </summary>
/// <param name="optionsBuilder">选项构建器。</param>
protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
{
if (optionsBuilder.IsConfigured) return;
ConfigureProvider(optionsBuilder, _dbConfig);
if (_dbConfig.EnableDetailedLog)
{
optionsBuilder.LogTo(Console.WriteLine, Microsoft.Extensions.Logging.LogLevel.Information);
}
// 启用详细的 EF Core 错误信息
optionsBuilder.EnableDetailedErrors();
optionsBuilder.EnableSensitiveDataLogging(_dbConfig.EnableDetailedLog);
}
/// <summary>
/// 根据配置选择数据库提供程序。
/// 使用注册模式，由宿主项目注册具体的提供程序实现。
/// </summary>
public static void ConfigureProvider(DbContextOptionsBuilder optionsBuilder, DatabaseConfiguration config)
{
if (DatabaseProviderRegistry.TryGet(config.Provider, out var configurator))
{
configurator(optionsBuilder, config.ConnectionString, config.Timeout);
}
else
{
throw new NotSupportedException(
$"数据库提供程序 {config.Provider} 未注册。" +
$"请在宿主项目中安装对应的 EF Core NuGet 包并调用 DatabaseProviderRegistry.Register()。");
}
optionsBuilder.EnableDetailedErrors();
optionsBuilder.EnableSensitiveDataLogging(config.EnableDetailedLog);
if (config.EnableDetailedLog)
{
optionsBuilder.LogTo(Console.WriteLine, Microsoft.Extensions.Logging.LogLevel.Information);
}
}
/// <summary>
/// 保存时自动设置时间戳。
/// </summary>
public override int SaveChanges(bool acceptAllChangesOnSuccess)
{
SetTimestamps();
return base.SaveChanges(acceptAllChangesOnSuccess);
}
/// <summary>
/// 异步保存更改，自动设置时间戳。
/// </summary>
/// <param name="acceptAllChangesOnSuccess">是否在成功时接受所有更改。</param>
/// <param name="cancellationToken">取消令牌。</param>
/// <returns>受影响的行数。</returns>
public override Task<int> SaveChangesAsync(bool acceptAllChangesOnSuccess, CancellationToken cancellationToken = default)
{
SetTimestamps();
return base.SaveChangesAsync(acceptAllChangesOnSuccess, cancellationToken);
}
/// <summary>
/// 自动设置新增或修改实体的 CreatedAt 和 UpdatedAt 时间戳。
/// </summary>
private void SetTimestamps()
{
var entries = ChangeTracker.Entries()
.Where(e => e.State == EntityState.Added || e.State == EntityState.Modified);
foreach (var entry in entries)
{
var entity = entry.Entity;
// 使用反射设置 CreatedAt / UpdatedAt（如果存在）
var createdAtProp = entity.GetType().GetProperty("CreatedAt");
var updatedAtProp = entity.GetType().GetProperty("UpdatedAt");
if (entry.State == EntityState.Added && createdAtProp != null)
{
createdAtProp.SetValue(entity, DateTime.UtcNow);
}
if (updatedAtProp != null)
{
updatedAtProp.SetValue(entity, DateTime.UtcNow);
}
}
}
}
}
Avalonia-EFCore/Database/DatabaseConfiguration.cs
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namespace Avalonia_EFCore.Database
{
/// <summary>
/// 支持的数据库提供程序类型。
/// </summary>
public enum DatabaseProvider
{
/// <summary>SQLite（本地文件数据库，无需安装，跨平台）</summary>
SQLite,
/// <summary>MySQL / MariaDB</summary>
MySQL,
/// <summary>PostgreSQL</summary>
PostgreSQL,
/// <summary>SQL Server</summary>
SqlServer
}
/// <summary>
/// 数据库连接配置 —— 在 appsettings.json 中配置。
/// </summary>
public class DatabaseConfiguration
{
/// <summary>数据库提供程序</summary>
public DatabaseProvider Provider { get; set; } = DatabaseProvider.SQLite;
/// <summary>连接字符串</summary>
public string ConnectionString { get; set; } = "Data Source=app.db";
/// <summary>是否在启动时自动执行迁移</summary>
public bool AutoMigrate { get; set; } = true;
/// <summary>
/// 是否在迁移前删除并重建当前连接指向的数据库。
/// 仅用于切换数据库类型或本地开发重建库；生产环境默认必须保持 false。
/// </summary>
public bool RecreateDatabase { get; set; } = false;
/// <summary>是否启用详细日志（会打印 SQL 语句）</summary>
public bool EnableDetailedLog { get; set; } = false;
/// <summary>连接超时（秒）</summary>
public int Timeout { get; set; } = 30;
// ---- 快捷构建方法 ----
/// <summary>SQLite 本地数据库</summary>
public static DatabaseConfiguration ForSQLite(string dataSource = "app.db")
{
return new DatabaseConfiguration
{
Provider = DatabaseProvider.SQLite,
ConnectionString = $"Data Source={dataSource}",
AutoMigrate = true,
};
}
/// <summary>MySQL 数据库</summary>
public static DatabaseConfiguration ForMySQL(string server, string database, string user, string password, uint port = 3306)
{
return new DatabaseConfiguration
{
Provider = DatabaseProvider.MySQL,
ConnectionString = $"Server={server};Port={port};Database={database};User={user};Password={password};",
};
}
/// <summary>PostgreSQL 数据库</summary>
public static DatabaseConfiguration ForPostgreSQL(string host, string database, string username, string password, int port = 5432)
{
return new DatabaseConfiguration
{
Provider = DatabaseProvider.PostgreSQL,
ConnectionString = $"Host={host};Port={port};Database={database};Username={username};Password={password};",
};
}
/// <summary>SQL Server 数据库</summary>
public static DatabaseConfiguration ForSqlServer(string server, string database, string? user = null, string? password = null)
{
var connStr = string.IsNullOrEmpty(user)
? $"Server={server};Database={database};Trusted_Connection=True;TrustServerCertificate=True;"
: $"Server={server};Database={database};User Id={user};Password={password};TrustServerCertificate=True;";
return new DatabaseConfiguration
{
Provider = DatabaseProvider.SqlServer,
ConnectionString = connStr,
};
}
}
}
Avalonia-EFCore/Database/DatabaseExtensions.cs
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using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.DependencyInjection;
namespace Avalonia_EFCore.Database
{
/// <summary>
/// 数据库服务注册扩展 —— 在 Program.cs 中一行配置数据库。
/// </summary>
public static class DatabaseExtensions
{
/// <summary>
/// 注册数据库上下文及相关服务。
/// </summary>
/// <typeparam name="TContext">继承自 AppDbContext 的业务 DbContext</typeparam>
public static IServiceCollection AddAppDatabase<TContext>(
this IServiceCollection services,
DatabaseConfiguration config)
where TContext : AppDbContext
{
// 注册配置
services.AddSingleton(config);
if (typeof(TContext) == typeof(AppDataContext))
{
services.AddProviderAppDataContext(config);
services.AddScoped<DatabaseManager<TContext>>();
return services;
}
// 注册 DbContext
services.AddDbContext<TContext>(options =>
{
AppDbContext.ConfigureProvider(options, config);
});
// 注册数据库管理器
services.AddScoped<DatabaseManager<TContext>>();
return services;
}
private static void AddProviderAppDataContext(this IServiceCollection services, DatabaseConfiguration config)
{
switch (config.Provider)
{
case DatabaseProvider.SQLite:
services.AddDbContext<AppDataContext, SqliteAppDataContext>(options =>
AppDbContext.ConfigureProvider(options, config));
break;
case DatabaseProvider.SqlServer:
services.AddDbContext<AppDataContext, SqlServerAppDataContext>(options =>
AppDbContext.ConfigureProvider(options, config));
break;
case DatabaseProvider.PostgreSQL:
services.AddDbContext<AppDataContext, PostgreSqlAppDataContext>(options =>
AppDbContext.ConfigureProvider(options, config));
break;
case DatabaseProvider.MySQL:
services.AddDbContext<AppDataContext, MySqlAppDataContext>(options =>
AppDbContext.ConfigureProvider(options, config));
break;
default:
throw new NotSupportedException($"数据库提供程序 {config.Provider} 未注册。");
}
}
/// <summary>
/// 初始化数据库（在应用启动时调用一次）。
/// </summary>
public static IServiceProvider InitializeDatabase<TContext>(
this IServiceProvider serviceProvider,
Action<TContext, IServiceProvider?>? seeder = null)
where TContext : AppDbContext
{
using var scope = serviceProvider.CreateScope();
var dbManager = scope.ServiceProvider.GetRequiredService<DatabaseManager<TContext>>();
// 同步等待初始化（启动时阻塞）
dbManager.InitializeAsync(seeder).GetAwaiter().GetResult();
return serviceProvider;
}
}
}
Avalonia-EFCore/Database/DatabaseManager.cs
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using Avalonia_Common.Infrastructure;
using Microsoft.EntityFrameworkCore;
using Microsoft.EntityFrameworkCore.Infrastructure;
using Microsoft.EntityFrameworkCore.Migrations;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using System.Threading;
using System.Threading.Tasks;
namespace Avalonia_EFCore.Database
{
/// <summary>
/// 数据库管理器 —— 负责连接测试、自动迁移、种子数据、版本检查。
/// 在应用启动时调用，确保数据库结构与应用代码同步。
/// </summary>
public class DatabaseManager<TContext> where TContext : AppDbContext
{
/// <summary>
/// 数据库上下文实例。
/// </summary>
private readonly TContext _context;
/// <summary>
/// 数据库配置。
/// </summary>
private readonly DatabaseConfiguration _config;
/// <summary>
/// DI 服务提供程序（可选，用于种子数据中解析服务）。
/// </summary>
private readonly IServiceProvider? _serviceProvider;
/// <summary>
/// 初始化数据库管理器。
/// </summary>
/// <param name="context">数据库上下文。</param>
/// <param name="config">数据库配置。</param>
/// <param name="serviceProvider">可选的 DI 容器。</param>
public DatabaseManager(TContext context, DatabaseConfiguration config, IServiceProvider? serviceProvider = null)
{
_context = context;
_config = config;
_serviceProvider = serviceProvider;
}
/// <summary>
/// 初始化数据库：测试连接 → 自动迁移 → 种子数据。
/// </summary>
public async Task InitializeAsync(Action<TContext, IServiceProvider?>? seeder = null)
{
AppLog.Information(
"正在初始化数据库 Provider={Provider}, AppVersion={AppVersion}",
_config.Provider,
GetApplicationVersion());
// 1. 自动迁移（如果启用）。MigrateAsync 会按迁移历史顺序执行全部待处理迁移，
// 支持用户从较旧软件版本直接升级到当前版本。
if (_config.AutoMigrate)
{
if (_config.RecreateDatabase)
{
AppLog.Warning(
"RecreateDatabase=true，将删除并重建当前连接指向的数据库。Provider={Provider}",
_config.Provider);
await _context.Database.EnsureDeletedAsync();
}
await MigrateAsync();
}
else
{
var canConnect = await CanConnectAsync();
if (!canConnect)
{
throw new InvalidOperationException(
$"无法连接到数据库 [{_config.Provider}]，请检查连接字符串和数据库服务状态。");
}
}
// 2. 种子数据
if (seeder != null)
{
seeder(_context, _serviceProvider);
await _context.SaveChangesAsync();
}
}
/// <summary>
/// 测试数据库连接是否正常。
/// </summary>
public async Task<bool> CanConnectAsync()
{
try
{
return await _context.Database.CanConnectAsync();
}
catch
{
return false;
}
}
/// <summary>
/// 执行待处理的迁移。
/// 使用 EF Core 原生迁移机制，自动检测并应用 Schema 变更。
/// </summary>
public async Task MigrateAsync()
{
try
{
var appliedMigrations = (await _context.Database.GetAppliedMigrationsAsync()).ToList();
var pendingMigrations = await _context.Database.GetPendingMigrationsAsync();
if (pendingMigrations.Any())
{
if (appliedMigrations.Count == 0)
{
AppLog.Information(
"未检测到已应用迁移，将按当前 Provider={Provider} 从 0 构建完整表结构",
_config.Provider);
}
AppLog.Information(
"当前已应用 {AppliedCount} 个迁移，检测到 {PendingCount} 个待执行迁移: {Migrations}",
appliedMigrations.Count,
pendingMigrations.Count(),
string.Join(", ", pendingMigrations));
await _context.Database.MigrateAsync();
AppLog.Information("数据库迁移完成（{Count} 个迁移已应用）", pendingMigrations.Count());
}
else
{
AppLog.Information("数据库已是最新版本，无需迁移");
}
}
catch (Exception ex)
{
AppLog.Error(ex, "数据库迁移失败");
throw;
}
}
/// <summary>
/// 获取当前应用程序的版本号，优先读取 AssemblyInformationalVersion，回退到 AssemblyVersion。
/// </summary>
/// <returns>应用程序版本字符串。</returns>
private static string GetApplicationVersion()
{
var assembly = Assembly.GetEntryAssembly() ?? typeof(TContext).Assembly;
return assembly
.GetCustomAttribute<AssemblyInformationalVersionAttribute>()
?.InformationalVersion
?? assembly.GetName().Version?.ToString()
?? "unknown";
}
/// <summary>
/// 获取数据库当前版本信息。
/// </summary>
public async Task<DatabaseVersionInfo> GetVersionInfoAsync()
{
var appliedMigrations = await _context.Database.GetAppliedMigrationsAsync();
var pendingMigrations = await _context.Database.GetPendingMigrationsAsync();
return new DatabaseVersionInfo
{
Provider = _config.Provider.ToString(),
AppliedMigrations = appliedMigrations.ToList(),
PendingMigrations = pendingMigrations.ToList(),
IsLatest = !pendingMigrations.Any(),
CanConnect = await CanConnectAsync(),
};
}
/// <summary>
/// 生成从指定迁移到最新版本的 SQL 脚本（用于生产环境审计）。
/// </summary>
public string GenerateMigrationScript(string? fromMigration = null)
{
var migrator = _context.GetService<IMigrator>();
return fromMigration is null
? migrator.GenerateScript()
: migrator.GenerateScript(fromMigration);
}
/// <summary>
/// 确保数据库已创建（不执行迁移，适用于简单场景）。
/// </summary>
public bool EnsureCreated()
{
return _context.Database.EnsureCreated();
}
}
/// <summary>
/// 数据库版本信息 DTO。
/// </summary>
public class DatabaseVersionInfo
{
/// <summary>
/// 获取或设置数据库提供程序名称。
/// </summary>
public string Provider { get; set; } = string.Empty;
/// <summary>
/// 获取或设置已应用的迁移列表。
/// </summary>
public List<string> AppliedMigrations { get; set; } = new();
/// <summary>
/// 获取或设置待应用的迁移列表。
/// </summary>
public List<string> PendingMigrations { get; set; } = new();
/// <summary>
/// 获取或设置是否为最新版本。
/// </summary>
public bool IsLatest { get; set; }
/// <summary>
/// 获取或设置数据库是否可连接。
/// </summary>
public bool CanConnect { get; set; }
}
}
Avalonia-EFCore/Database/DatabaseProviderRegistry.cs
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using Microsoft.EntityFrameworkCore;
namespace Avalonia_EFCore.Database
{
/// <summary>
/// 数据库提供程序注册表 —— 统一注册所有支持的提供程序配置委托。
/// 具体使用哪个提供程序由各宿主项目决定：
/// Avalonia-API：从 appsettings.json 的 DatabaseConfiguration 节读取；
/// Avalonia-PC ：固定使用 SQLite。
/// </summary>
public static class DatabaseProviderRegistry
{
/// <summary>
/// 提供程序配置委托：optionsBuilder, connectionString, timeout → void
/// </summary>
public delegate void ProviderConfigurator(DbContextOptionsBuilder optionsBuilder, string connectionString, int timeout);
/// <summary>
/// 保存已注册的数据库提供程序及其配置委托。
/// </summary>
private static readonly Dictionary<DatabaseProvider, ProviderConfigurator> _providers = new();
/// <summary>
/// 注册一个数据库提供程序。
/// </summary>
public static void Register(DatabaseProvider provider, ProviderConfigurator configurator)
{
_providers[provider] = configurator;
}
/// <summary>
/// 尝试获取注册的提供程序配置。
/// </summary>
public static bool TryGet(DatabaseProvider provider, out ProviderConfigurator configurator)
{
return _providers.TryGetValue(provider, out configurator!);
}
/// <summary>
/// 注册所有内置提供程序的默认配置（四个包均已内置在 Avalonia-EFCore 中）。
/// 注册完成后由调用方根据自身需求选择具体的 <see cref="DatabaseProvider"/>。
/// </summary>
public static void RegisterDefaults()
{
Register(DatabaseProvider.SQLite, (opts, cs, timeout) =>
opts.UseSqlite(cs, o => o.CommandTimeout(timeout)));
Register(DatabaseProvider.SqlServer, (opts, cs, timeout) =>
opts.UseSqlServer(cs, o => { o.CommandTimeout(timeout); o.EnableRetryOnFailure(3); }));
Register(DatabaseProvider.PostgreSQL, (opts, cs, timeout) =>
opts.UseNpgsql(cs, o => { o.CommandTimeout(timeout); o.EnableRetryOnFailure(3); }));
Register(DatabaseProvider.MySQL, (opts, cs, timeout) =>
opts.UseMySQL(cs, o => o.CommandTimeout(timeout)));
}
}
}
Avalonia-EFCore/Database/ProviderAppDataContexts.cs
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namespace Avalonia_EFCore.Database
{
/// <summary>
/// SQLite 专用 DbContext，用于隔离 SQLite 迁移集。
/// </summary>
public sealed class SqliteAppDataContext(DatabaseConfiguration dbConfig) : AppDataContext(dbConfig)
{
}
/// <summary>
/// SQL Server 专用 DbContext，用于隔离 SQL Server 迁移集。
/// </summary>
public sealed class SqlServerAppDataContext(DatabaseConfiguration dbConfig) : AppDataContext(dbConfig)
{
}
/// <summary>
/// PostgreSQL 专用 DbContext，用于隔离 PostgreSQL 迁移集。
/// </summary>
public sealed class PostgreSqlAppDataContext(DatabaseConfiguration dbConfig) : AppDataContext(dbConfig)
{
}
/// <summary>
/// MySQL 专用 DbContext，用于隔离 MySQL 迁移集。
/// </summary>
public sealed class MySqlAppDataContext(DatabaseConfiguration dbConfig) : AppDataContext(dbConfig)
{
}
}