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384 lines
16 KiB
C#
384 lines
16 KiB
C#
using FreeSql.Extensions.EntityUtil;
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using FreeSql.Internal.Model;
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using System;
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using System.Collections;
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using System.Collections.Generic;
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using System.Collections.Concurrent;
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using System.Linq;
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using System.Linq.Expressions;
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using System.Reflection;
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using System.Threading;
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namespace FreeSql
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{
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class DbContextDbSet<TEntity> : DbSet<TEntity> where TEntity : class
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{
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public DbContextDbSet(DbContext ctx)
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{
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_db = ctx;
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_uow = ctx.UnitOfWork;
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}
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}
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public interface IDbSet : IDisposable
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{
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Type EntityType { get; }
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}
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public abstract partial class DbSet<TEntity> : IDbSet where TEntity : class
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{
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internal DbContext _db { get; set; }
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internal IUnitOfWork _uow { get; set; }
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protected virtual ISelect<TEntity> OrmSelect(object dywhere)
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{
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DbContextFlushCommand(); //查询前先提交，否则会出脏读
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var select = _db.OrmOriginal.Select<TEntity>().AsType(_entityType).WithTransaction(_uow?.GetOrBeginTransaction(false)).TrackToList(TrackToList).WhereDynamic(dywhere);
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if (_db.Options.EnableGlobalFilter == false) select.DisableGlobalFilter();
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return select;
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}
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~DbSet() => this.Dispose();
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int _disposeCounter;
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public void Dispose()
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{
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if (Interlocked.Increment(ref _disposeCounter) != 1) return;
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try
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{
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this._dicUpdateTimes.Clear();
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this._states.Clear();
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this._statesEditing.Clear();
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this._dataEditing = null;
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}
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finally
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{
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GC.SuppressFinalize(this);
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}
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}
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protected virtual IInsert<TEntity> OrmInsert()
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{
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var insert = _db.OrmOriginal.Insert<TEntity>().AsType(_entityType).WithTransaction(_uow?.GetOrBeginTransaction());
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if (_db.Options.NoneParameter != null) insert.NoneParameter(_db.Options.NoneParameter.Value);
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return insert;
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}
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protected virtual IInsert<TEntity> OrmInsert(TEntity data) => OrmInsert().AppendData(data);
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protected virtual IInsert<TEntity> OrmInsert(IEnumerable<TEntity> data) => OrmInsert().AppendData(data);
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protected virtual IUpdate<TEntity> OrmUpdate(IEnumerable<TEntity> entitys)
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{
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var update = _db.OrmOriginal.Update<TEntity>().AsType(_entityType).WithTransaction(_uow?.GetOrBeginTransaction());
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if (_db.Options.NoneParameter != null) update.NoneParameter(_db.Options.NoneParameter.Value);
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if (_db.Options.EnableGlobalFilter == false) update.DisableGlobalFilter();
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return update.SetSource(entitys);
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}
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protected virtual IDelete<TEntity> OrmDelete(object dywhere)
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{
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var delete = _db.OrmOriginal.Delete<TEntity>().AsType(_entityType).WithTransaction(_uow?.GetOrBeginTransaction()).WhereDynamic(dywhere);
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if (_db.Options.EnableGlobalFilter == false) delete.DisableGlobalFilter();
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return delete;
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}
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internal void EnqueueToDbContext(DbContext.EntityChangeType changeType, EntityState state) =>
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_db.EnqueuePreCommand(changeType, this, typeof(EntityState), _entityType, state);
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internal void IncrAffrows(int affrows) =>
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_db._affrows += affrows;
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internal void TrackToList(object list)
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{
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if (list == null) return;
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var ls = list as IEnumerable<TEntity>;
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if (ls == null)
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{
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var ie = list as IEnumerable;
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if (ie == null) return;
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foreach (var item in ie)
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{
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if (item == null) return;
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var itemType = item.GetType();
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if (itemType == typeof(object)) return;
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if (itemType.FullName.Contains("FreeSqlLazyEntity__")) itemType = itemType.BaseType;
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if (_db.OrmOriginal.CodeFirst.GetTableByEntity(itemType)?.Primarys.Any() != true) return;
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var dbset = _db.Set(itemType);
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dbset?.GetType().GetMethod("TrackToList", BindingFlags.Instance | BindingFlags.NonPublic).Invoke(dbset, new object[] { list });
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return;
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}
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return;
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}
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if (_table?.Primarys.Any() != true) return;
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foreach (var item in ls)
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{
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var key = _db.OrmOriginal.GetEntityKeyString(_entityType, item, false);
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if (key == null) continue;
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_states.AddOrUpdate(key, k => CreateEntityState(item), (k, ov) =>
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{
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_db.OrmOriginal.MapEntityValue(_entityType, item, ov.Value);
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ov.Time = DateTime.Now;
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return ov;
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});
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}
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}
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public ISelect<TEntity> Select => this.OrmSelect(null);
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public ISelect<TEntity> Where(Expression<Func<TEntity, bool>> exp) => this.OrmSelect(null).Where(exp);
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public ISelect<TEntity> WhereIf(bool condition, Expression<Func<TEntity, bool>> exp) => this.OrmSelect(null).WhereIf(condition, exp);
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protected ConcurrentDictionary<string, EntityState> _states = new ConcurrentDictionary<string, EntityState>();
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TableInfo _tablePriv;
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protected TableInfo _table => _tablePriv ?? (_tablePriv = _db.OrmOriginal.CodeFirst.GetTableByEntity(_entityType));
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ColumnInfo[] _tableIdentitysPriv, _tableServerTimesPriv;
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protected ColumnInfo[] _tableIdentitys => _tableIdentitysPriv ?? (_tableIdentitysPriv = _table.Primarys.Where(a => a.Attribute.IsIdentity).ToArray());
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protected ColumnInfo[] _tableServerTimes => _tableServerTimesPriv ?? (_tableServerTimesPriv = _table.Primarys.Where(a => a.Attribute.ServerTime != DateTimeKind.Unspecified).ToArray());
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protected Type _entityType = typeof(TEntity);
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public Type EntityType => _entityType;
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/// <summary>
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/// 动态Type，在使用 DbSet<object> 后使用本方法，指定实体类型
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/// </summary>
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/// <param name="entityType"></param>
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/// <returns></returns>
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public DbSet<TEntity> AsType(Type entityType)
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{
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if (entityType == typeof(object)) throw new Exception("ISelect.AsType 参数不支持指定为 object");
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if (entityType == _entityType) return this;
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var newtb = _db.OrmOriginal.CodeFirst.GetTableByEntity(entityType);
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_entityType = entityType;
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_tablePriv = newtb ?? throw new Exception("DbSet.AsType 参数错误，请传入正确的实体类型");
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_tableIdentitysPriv = null;
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_tableServerTimesPriv = null;
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return this;
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}
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Dictionary<Type, DbSet<object>> _dicDbSetObjects = new Dictionary<Type, DbSet<object>>();
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DbSet<object> GetDbSetObject(Type et)
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{
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if (_dicDbSetObjects.TryGetValue(et, out var tryds)) return tryds;
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_dicDbSetObjects.Add(et, tryds = _db.Set<object>().AsType(et));
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if (_db.InternalDicSet.TryGetValue(et, out var tryds2))
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{
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var copyTo = typeof(DbSet<>).MakeGenericType(et).GetMethod("StatesCopyToDbSetObject", BindingFlags.NonPublic | BindingFlags.Instance, null, new[] { typeof(DbSet<object>) }, null);
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copyTo?.Invoke(tryds2, new object[] { tryds });
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}
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return tryds;
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}
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void StatesCopyToDbSetObject(DbSet<object> ds)
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{
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ds.AttachRange(_states.Values.OrderBy(a => a.Time).Select(a => a.Value).ToArray());
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}
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public class EntityState
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{
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public EntityState(TEntity value, string key)
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{
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this.Value = value;
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this.Key = key;
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this.Time = DateTime.Now;
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}
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public TEntity OldValue { get; set; }
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public TEntity Value { get; set; }
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public string Key { get; set; }
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public DateTime Time { get; set; }
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}
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/// <summary>
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/// 附加实体，可用于不查询就更新或删除
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/// </summary>
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/// <param name="data"></param>
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public void Attach(TEntity data) => AttachRange(new[] { data });
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public void AttachRange(IEnumerable<TEntity> data)
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{
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if (data == null || data.Any() == false) return;
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if (_table.Primarys.Any() == false) throw new Exception($"不可附加，实体没有主键：{_db.OrmOriginal.GetEntityString(_entityType, data.First())}");
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foreach (var item in data)
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{
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var key = _db.OrmOriginal.GetEntityKeyString(_entityType, item, false);
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if (string.IsNullOrEmpty(key)) throw new Exception($"不可附加，未设置主键的值：{_db.OrmOriginal.GetEntityString(_entityType, item)}");
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_states.AddOrUpdate(key, k => CreateEntityState(item), (k, ov) =>
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{
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_db.OrmOriginal.MapEntityValue(_entityType, item, ov.Value);
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ov.Time = DateTime.Now;
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return ov;
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});
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}
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}
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/// <summary>
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/// 附加实体，并且只附加主键值，可用于不更新属性值为null或默认值的字段
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/// </summary>
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/// <param name="data"></param>
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public DbSet<TEntity> AttachOnlyPrimary(TEntity data)
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{
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if (data == null) return this;
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var pkitem = (TEntity)Activator.CreateInstance(_entityType);
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foreach (var pk in _db.OrmOriginal.CodeFirst.GetTableByEntity(_entityType).Primarys)
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{
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var colVal = _db.OrmOriginal.GetEntityValueWithPropertyName(_entityType, data, pk.CsName);
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_db.OrmOriginal.SetEntityValueWithPropertyName(_entityType, pkitem, pk.CsName, colVal);
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}
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this.Attach(pkitem);
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return this;
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}
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/// <summary>
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/// 清空状态数据
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/// </summary>
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public void FlushState()
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{
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_states.Clear();
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}
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#region Utils
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EntityState CreateEntityState(TEntity data)
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{
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if (data == null) throw new ArgumentNullException(nameof(data));
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var key = _db.OrmOriginal.GetEntityKeyString(_entityType, data, false);
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var state = new EntityState((TEntity)Activator.CreateInstance(_entityType), key);
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_db.OrmOriginal.MapEntityValue(_entityType, data, state.Value);
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return state;
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}
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bool? ExistsInStates(TEntity data)
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{
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if (data == null) throw new ArgumentNullException(nameof(data));
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var key = _db.OrmOriginal.GetEntityKeyString(_entityType, data, false);
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if (string.IsNullOrEmpty(key)) return null;
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return _states.ContainsKey(key);
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}
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bool CanAdd(IEnumerable<TEntity> data, bool isThrow)
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{
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if (data == null)
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{
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if (isThrow) throw new ArgumentNullException(nameof(data));
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return false;
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}
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if (data.Any() == false) return false;
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foreach (var s in data) if (CanAdd(s, isThrow) == false) return false;
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return true;
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}
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bool CanAdd(TEntity data, bool isThrow)
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{
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if (data == null)
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{
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if (isThrow) throw new ArgumentNullException(nameof(data));
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return false;
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}
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if (_table.Primarys.Any() == false)
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{
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if (isThrow) throw new Exception($"不可添加，实体没有主键：{_db.OrmOriginal.GetEntityString(_entityType, data)}");
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return false;
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}
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FreeSql.Internal.CommonProvider.InsertProvider<TEntity>.AuditDataValue(this, data, _db.OrmOriginal, _table, null);
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var key = _db.OrmOriginal.GetEntityKeyString(_entityType, data, true);
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if (string.IsNullOrEmpty(key))
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{
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switch (_db.OrmOriginal.Ado.DataType)
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{
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case DataType.SqlServer:
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case DataType.OdbcSqlServer:
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case DataType.PostgreSQL:
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case DataType.OdbcPostgreSQL:
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case DataType.KingbaseES:
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case DataType.OdbcKingbaseES:
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case DataType.ShenTong:
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return true;
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default:
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if (_tableIdentitys.Length == 1 && _table.Primarys.Length == 1)
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return true;
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if (isThrow) throw new Exception($"不可添加，未设置主键的值：{_db.OrmOriginal.GetEntityString(_entityType, data)}");
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return false;
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}
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}
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else
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{
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if (_states.ContainsKey(key))
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{
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if (isThrow) throw new Exception($"不可添加，已存在于状态管理：{_db.OrmOriginal.GetEntityString(_entityType, data)}");
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return false;
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}
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var idval = _db.OrmOriginal.GetEntityIdentityValueWithPrimary(_entityType, data);
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if (idval > 0)
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{
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if (isThrow) throw new Exception($"不可添加，自增属性有值：{_db.OrmOriginal.GetEntityString(_entityType, data)}");
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return false;
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}
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}
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return true;
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}
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bool CanUpdate(IEnumerable<TEntity> data, bool isThrow)
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{
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if (data == null)
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{
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if (isThrow) throw new ArgumentNullException(nameof(data));
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return false;
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}
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if (data.Any() == false) return false;
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foreach (var s in data) if (CanUpdate(s, isThrow) == false) return false;
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return true;
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}
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bool CanUpdate(TEntity data, bool isThrow)
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{
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if (data == null)
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{
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if (isThrow) throw new ArgumentNullException(nameof(data));
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return false;
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}
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if (_table.Primarys.Any() == false)
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{
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if (isThrow) throw new Exception($"不可更新，实体没有主键：{_db.OrmOriginal.GetEntityString(_entityType, data)}");
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return false;
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}
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FreeSql.Internal.CommonProvider.UpdateProvider<TEntity>.AuditDataValue(this, data, _db.OrmOriginal, _table, null);
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var key = _db.OrmOriginal.GetEntityKeyString(_entityType, data, false);
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if (string.IsNullOrEmpty(key))
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{
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if (isThrow) throw new Exception($"不可更新，未设置主键的值：{_db.OrmOriginal.GetEntityString(_entityType, data)}");
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return false;
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}
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if (_states.TryGetValue(key, out var tryval) == false)
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{
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if (isThrow) throw new Exception($"不可更新，数据未被跟踪，应该先查询 或者 Attach：{_db.OrmOriginal.GetEntityString(_entityType, data)}");
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return false;
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}
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return true;
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}
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bool CanRemove(IEnumerable<TEntity> data, bool isThrow)
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{
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if (data == null)
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{
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if (isThrow) throw new ArgumentNullException(nameof(data));
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return false;
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}
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if (data.Any() == false) return false;
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foreach (var s in data) if (CanRemove(s, isThrow) == false) return false;
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return true;
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}
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bool CanRemove(TEntity data, bool isThrow)
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{
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if (data == null)
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{
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if (isThrow) throw new ArgumentNullException(nameof(data));
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return false;
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}
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if (_table.Primarys.Any() == false)
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{
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if (isThrow) throw new Exception($"不可删除，实体没有主键：{_db.OrmOriginal.GetEntityString(_entityType, data)}");
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return false;
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}
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var key = _db.OrmOriginal.GetEntityKeyString(_entityType, data, false);
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if (string.IsNullOrEmpty(key))
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{
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if (isThrow) throw new Exception($"不可删除，未设置主键的值：{_db.OrmOriginal.GetEntityString(_entityType, data)}");
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return false;
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}
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//if (_states.TryGetValue(key, out var tryval) == false) {
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// if (isThrow) throw new Exception($"不可删除，数据未被跟踪，应该先查询：{_fsql.GetEntityString(_entityType, data)}");
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// return false;
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//}
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return true;
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}
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#endregion
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}
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}
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