MongoDB 系列(一) C# 类似EF语法简单封装
public static>{/// <summary> /// 单个对象添加/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="collection"></param>
/// <param name="entity"></param>
public static void Add<T>(this IMongoCollection<T> collection, T entity) where T : IAggregateRoot
=> collection.InsertOne(entity);
/// <summary>
/// 集合添加
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="collection"></param>
/// <param name="entitys"></param>
public static void AddRange<T>(this IMongoCollection<T> collection, List<T> entitys) where T : IAggregateRoot
=> collection.InsertMany(entitys);
/// <summary>
/// entity mongodb需要更新的实体 properts需要更新的集合属性,大小写不限 默认更新整个对象 replace 默认空属性不修改
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="collection"></param>
/// <param name="entity">mongodb需要更新的实体</param>
/// <param name="properts">需要更新的集合属性,大小写不限 默认更新整个对象 </param>
/// <param name="replace">默认对象属性为空时不替换当前值</param>
public static void Update<T>(this IMongoCollection<T> collection, T entity, List<string> properts = null, bool replace = false) where T : IAggregateRoot
{
if (entity == null)
throw new NullReferenceException();
var type = entity.GetType();
///修改的属性集合
var list = new List<UpdateDefinition<T>>();
foreach (var propert in type.GetProperties())
{
if (propert.Name.ToLower() != "id")
{
if (properts == null || properts.Count < 1 || properts.Any(o => o.ToLower() == propert.Name.ToLower()))
{
var replaceValue = propert.GetValue(entity);
if (replaceValue != null)
{
list.Add(Builders<T>.Update.Set(propert.Name, replaceValue));
}
else if (replace)
list.Add(Builders<T>.Update.Set(propert.Name, replaceValue));
}
}
}
#region 有可修改的属性
if (list.Count > 0)
{
///合并多个修改//new List<UpdateDefinition<T>>() { Builders<T>.Update.Set("Name", "111") }
var builders = Builders<T>.Update.Combine(list);
///执行提交修改
collection.UpdateOne(o => o.Id == entity.Id, builders);
}
#endregion
}
/// <summary>
/// 移除根据ID
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="collection"></param>
/// <param name="entity"></param>
public static void Remove<T>(this IMongoCollection<T> collection, T entity) where T : IAggregateRoot
=> collection.DeleteOne(o => o.Id == entity.Id);
/// <summary>
/// 移除表达式
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="collection"></param>
/// <param name="expression"></param>
public static void Remove<T>(this IMongoCollection<T> collection, Expression<Func<T, bool>> expression) where T : IAggregateRoot
=> collection.DeleteOne(expression);
public static IFindFluent<T, T> Where<T>(this IMongoCollection<T> collection, Expression<Func<T, bool>> expression)
=> expression == null ? collection.Find(Builders<T>.Filter.Empty) : collection.Find(expression);
/// <summary>
/// MongoDB里面是没有实现IQueryable的 所以想要使用习惯的SELECT我们只能自己封装一下
/// </summary>
/// <typeparam name="TDocument"></typeparam>
/// <typeparam name="TProjection"></typeparam>
/// <typeparam name="TNewProjection">返回新的数据类型</typeparam>
/// <param name="IQueryable"></param>
/// <param name="projection"></param>
/// <returns></returns>
public static IFindFluent<TDocument, TNewProjection> Select<TDocument, TProjection, TNewProjection>(this IFindFluent<TDocument, TProjection> IQueryable, Expression<Func<TDocument, TNewProjection>> projection)
=> IQueryable.Project(projection);
/// <summary>
/// 获得筛选后的首个元素
/// </summary>
/// <typeparam name="TDocument"></typeparam>
/// <typeparam name="T"></typeparam>
/// <param name="IQueryable"></param>
/// <returns></returns>
public static T FirstOrDefault<TDocument, T>(this IFindFluent<TDocument, T> IQueryable)
=> IQueryable.First();
/// <summary>
/// 直接支持表达式树后的首个满足对象
/// </summary>
/// <typeparam name="TDocument"></typeparam>
/// <typeparam name="T"></typeparam>
/// <param name="collection"></param>
/// <param name="expression"></param>
/// <returns></returns>
public static T FirstOrDefault<TDocument, T>(this IMongoCollection<T> collection, Expression<Func<T, bool>> expression = null)
=> expression == null ? collection.Find(Builders<T>.Filter.Empty).First() : collection.Find(expression).First();
}
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