first commit

backend/F9WebAiTest.Infrastructure/Repositories/Repository.cs

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+using System.Linq.Expressions;
+using FreeSql;
+using F9WebAiTest.Domain.Common;
+
+namespace F9WebAiTest.Infrastructure.Repositories;
+
+/// <summary>通用仓储实现（基于 FreeSql）</summary>
+public class Repository<T> : IRepository<T> where T : class, IEntity
+{
+    protected readonly IFreeSql _fsql;
+
+    public Repository(IFreeSql fsql)
+    {
+        _fsql = fsql;
+    }
+
+    public virtual async Task<T> GetByIdAsync(long id)
+        => await _fsql.Select<T>().Where(e => e.Id == id).FirstAsync();
+
+    public virtual async Task<List<T>> GetAllAsync()
+        => await _fsql.Select<T>().ToListAsync();
+
+    public virtual async Task<List<T>> FindAsync(Expression<Func<T, bool>> predicate)
+        => await _fsql.Select<T>().Where(predicate).ToListAsync();
+
+    public virtual async Task<T> FirstOrDefaultAsync(Expression<Func<T, bool>> predicate)
+        => await _fsql.Select<T>().Where(predicate).FirstAsync();
+
+    public virtual async Task<bool> AnyAsync(Expression<Func<T, bool>> predicate)
+        => await _fsql.Select<T>().Where(predicate).AnyAsync();
+
+    public virtual async Task<long> CountAsync(Expression<Func<T, bool>> predicate)
+        => await _fsql.Select<T>().Where(predicate).CountAsync();
+
+    public virtual async Task<T> AddAsync(T entity)
+    {
+        entity.CreatedAt = DateTime.Now;
+        await _fsql.Insert(entity).ExecuteAffrowsAsync();
+        // FreeSql 在 SQLite 下不回填自增主键，手动用 last_insert_rowid 获取并回填
+        if (entity.Id == 0)
+        {
+            entity.Id = Convert.ToInt64(await _fsql.Ado.ExecuteScalarAsync("SELECT last_insert_rowid();"));
+        }
+        return entity;
+    }
+
+    public virtual async Task AddRangeAsync(IEnumerable<T> entities)
+    {
+        foreach (var e in entities) e.CreatedAt = DateTime.Now;
+        await _fsql.Insert(entities).ExecuteAffrowsAsync();
+    }
+
+    public virtual async Task UpdateAsync(T entity)
+    {
+        entity.UpdatedAt = DateTime.Now;
+        await _fsql.Update<T>().SetSource(entity).ExecuteAffrowsAsync();
+    }
+
+    public virtual async Task DeleteAsync(T entity)
+    {
+        entity.IsDeleted = true;
+        entity.UpdatedAt = DateTime.Now;
+        await _fsql.Update<T>().SetSource(entity).ExecuteAffrowsAsync();
+    }
+
+    public virtual async Task DeleteRangeAsync(IEnumerable<T> entities)
+    {
+        foreach (var e in entities)
+        {
+            e.IsDeleted = true;
+            e.UpdatedAt = DateTime.Now;
+        }
+        await _fsql.Update<T>().SetSource(entities).ExecuteAffrowsAsync();
+    }
+
+    public virtual async Task HardDeleteAsync(T entity)
+        => await _fsql.Delete<T>().Where(e => e.Id == entity.Id).ExecuteAffrowsAsync();
+
+    public virtual async Task HardDeleteRangeAsync(IEnumerable<T> entities)
+    {
+        var ids = entities.Select(e => e.Id).ToList();
+        if (ids.Count > 0)
+            await _fsql.Delete<T>().Where(e => ids.Contains(e.Id)).ExecuteAffrowsAsync();
+    }
+
+    public virtual Task<int> SaveChangesAsync()
+        => Task.FromResult(1); // FreeSql 即时提交，无 SaveChanges 语义，保持接口兼容
+}