Entity framework 带有连接的通用存储库模式 我已经开始阅读实体框架(6。x)的知识库模式,通过阅读我认为本文中最基本的处理方法:
不幸的是,它没有处理连接。使用通用存储库,如何连接到任意数量的其他实体/存储库 到目前为止,我在通用接口中有以下内容:Entity framework 带有连接的通用存储库模式 我已经开始阅读实体框架(6。x)的知识库模式,通过阅读我认为本文中最基本的处理方法:,entity-framework,repository-pattern,Entity Framework,Repository Pattern,不幸的是,它没有处理连接。使用通用存储库,如何连接到任意数量的其他实体/存储库 到目前为止,我在通用接口中有以下内容: interface IGenericRepository<T> where T: class { IEnumerable<T> SelectAll(); T SelectByID(object id); void Insert(T obj); void Update(T obj); void Delete(
interface IGenericRepository<T> where T: class
{
IEnumerable<T> SelectAll();
T SelectByID(object id);
void Insert(T obj);
void Update(T obj);
void Delete(object id);
void Save();
}
public class GenericRepository<T> : IGenericRepository<T> where T : class
{
private SocialMediaEntities db = null;
private DbSet<T> table = null;
public GenericRepository()
{
this.db = new SocialMediaEntities();
table = db.Set<T>();
}
public GenericRepository(SocialMediaEntities db)
{
this.db = db;
table = db.Set<T>();
}
public IEnumerable<T> SelectAll()
{
return table.ToList();
}
public T SelectByID(object id)
{
return table.Find(id);
}
public void Insert(T obj)
{
table.Add(obj);
}
public void Update(T obj)
{
table.Attach(obj);
db.Entry(obj).State = EntityState.Modified;
}
public void Delete(object id)
{
T existing = table.Find(id);
table.Remove(existing);
}
public void Save()
{
db.SaveChanges();
}
}
在研究了给出的第一个答案之后,它似乎更符合通用存储库模式的精神。您可以为GetAll方法创建几个重载。像这样:
//get all, including orderby clause, and includes
//usage: var s = repository.GetAll(i => i.Name, false, i => i.NavigationProperty);
public IEnumerable<T> GetAll<TOrderKey>(Expression<Func<T, TOrderKey>> orderbyExp,
Boolean descending,
params Expression<Func<T, Object>>[] includeExps)
{
var query = table.AsQueryable();
query = !descending ? query.OrderBy(orderByExp) : query.OrderByDescending(orderByExp);
if (includeExps != null)
query = includeExps.Aggregate(query, (current, exp) => current.Include(exp));
return query.ToList();
}
//get all, including select clause, orderby clause, and includes
//usage: var s = repository.GetAll(i => new { Name = i.Name }, i => i.Name, false, i => i.NavigationProperty
public IEnumerable<TReturn> GetAll<TReturn, TOrderKey>(Expression<Func<T, TReturn>> selectExp,
Expression<Func<T, TOrderKey>> orderExp,
Boolean descending,
params Expression<Func<T, Object>>[] includeExps)
{
var query = table.AsQueryable();
query = !descending ? query.OrderBy(orderByExp) : query.OrderByDescending(orderByExp);
if (includeExps != null)
query = includeExps.Aggregate(query, (current, exp) => current.Include(exp));
return query.Select(selectExp).ToList();
}
//get all, including select clause, where clause, order by clause, and includes
//usage: var s = repository.GetAll(i => new { i.Name }, i => i.Name.Contains('John'), i => i.Name, false, i => i.NavigationProperty
public IEnumerable<TReturn> GetAll<TReturn, TOrderKey>(Expression<Func<T, TReturn>> selectExp,
Expression<Func<T, Boolean>> whereExp,
Expression<Func<T, TOrderKey>> orderbyExp,
Boolean descending,
params Expression<Func<T, object>>[] includeExps)
{
var query = table.Where(whereExp);
query = !descending ? query.OrderBy(orderbyExp) : query.OrderByDescending(orderbyExp);
if (includeExps != null)
query = includeExps.Aggregate(query, (current, exp) => current.Include(exp));
return query.Select(selectExp).ToList();
}
//获取全部,包括orderby子句和includes
//用法:var s=repository.GetAll(i=>i.Name,false,i=>i.NavigationProperty);
公共IEnumerable GetAll(表达式orderbyExp,
布尔递减,
参数表达式[]includeExps)
{
var query=table.AsQueryable();
query=!descending?query.OrderBy(orderByExp):query.OrderByDescending(orderByExp);
如果(includeExps!=null)
query=includeExps.Aggregate(query,(current,exp)=>current.Include(exp));
返回query.ToList();
}
//获取全部,包括select子句、orderby子句和includes
//用法:var s=repository.GetAll(i=>new{Name=i.Name},i=>i.Name,false,i=>i.NavigationProperty
公共IEnumerable GetAll(表达式selectExp,
表达式orderExp,
布尔递减,
参数表达式[]includeExps)
{
var query=table.AsQueryable();
query=!descending?query.OrderBy(orderByExp):query.OrderByDescending(orderByExp);
如果(includeExps!=null)
query=includeExps.Aggregate(query,(current,exp)=>current.Include(exp));
返回query.Select(selectExp.ToList();
}
//获取全部,包括select子句、where子句、order by子句和INCLUDE
//用法:var s=repository.GetAll(i=>new{i.Name},i=>i.Name.Contains('John'),i=>i.Name,false,i=>i.NavigationProperty
公共IEnumerable GetAll(表达式selectExp,
表达方式如下:,
表达式orderbyExp,
布尔递减,
参数表达式[]includeExps)
{
var查询=表。其中(whereExp);
query=!descending?query.OrderBy(orderbyExp):query.OrderByDescending(orderbyExp);
如果(includeExps!=null)
query=includeExps.Aggregate(query,(current,exp)=>current.Include(exp));
返回query.Select(selectExp.ToList();
}
上述方法只是一个示例。您应该根据需要重新创建它们。您可以为GetAll方法创建多个重载。如下所示:
//get all, including orderby clause, and includes
//usage: var s = repository.GetAll(i => i.Name, false, i => i.NavigationProperty);
public IEnumerable<T> GetAll<TOrderKey>(Expression<Func<T, TOrderKey>> orderbyExp,
Boolean descending,
params Expression<Func<T, Object>>[] includeExps)
{
var query = table.AsQueryable();
query = !descending ? query.OrderBy(orderByExp) : query.OrderByDescending(orderByExp);
if (includeExps != null)
query = includeExps.Aggregate(query, (current, exp) => current.Include(exp));
return query.ToList();
}
//get all, including select clause, orderby clause, and includes
//usage: var s = repository.GetAll(i => new { Name = i.Name }, i => i.Name, false, i => i.NavigationProperty
public IEnumerable<TReturn> GetAll<TReturn, TOrderKey>(Expression<Func<T, TReturn>> selectExp,
Expression<Func<T, TOrderKey>> orderExp,
Boolean descending,
params Expression<Func<T, Object>>[] includeExps)
{
var query = table.AsQueryable();
query = !descending ? query.OrderBy(orderByExp) : query.OrderByDescending(orderByExp);
if (includeExps != null)
query = includeExps.Aggregate(query, (current, exp) => current.Include(exp));
return query.Select(selectExp).ToList();
}
//get all, including select clause, where clause, order by clause, and includes
//usage: var s = repository.GetAll(i => new { i.Name }, i => i.Name.Contains('John'), i => i.Name, false, i => i.NavigationProperty
public IEnumerable<TReturn> GetAll<TReturn, TOrderKey>(Expression<Func<T, TReturn>> selectExp,
Expression<Func<T, Boolean>> whereExp,
Expression<Func<T, TOrderKey>> orderbyExp,
Boolean descending,
params Expression<Func<T, object>>[] includeExps)
{
var query = table.Where(whereExp);
query = !descending ? query.OrderBy(orderbyExp) : query.OrderByDescending(orderbyExp);
if (includeExps != null)
query = includeExps.Aggregate(query, (current, exp) => current.Include(exp));
return query.Select(selectExp).ToList();
}
//获取全部,包括orderby子句和includes
//用法:var s=repository.GetAll(i=>i.Name,false,i=>i.NavigationProperty);
公共IEnumerable GetAll(表达式orderbyExp,
布尔递减,
参数表达式[]includeExps)
{
var query=table.AsQueryable();
query=!descending?query.OrderBy(orderByExp):query.OrderByDescending(orderByExp);
如果(includeExps!=null)
query=includeExps.Aggregate(query,(current,exp)=>current.Include(exp));
返回query.ToList();
}
//获取全部,包括select子句、orderby子句和includes
//用法:var s=repository.GetAll(i=>new{Name=i.Name},i=>i.Name,false,i=>i.NavigationProperty
公共IEnumerable GetAll(表达式selectExp,
表达式orderExp,
布尔递减,
参数表达式[]includeExps)
{
var query=table.AsQueryable();
query=!descending?query.OrderBy(orderByExp):query.OrderByDescending(orderByExp);
如果(includeExps!=null)
query=includeExps.Aggregate(query,(current,exp)=>current.Include(exp));
返回query.Select(selectExp.ToList();
}
//获取全部,包括select子句、where子句、order by子句和INCLUDE
//用法:var s=repository.GetAll(i=>new{i.Name},i=>i.Name.Contains('John'),i=>i.Name,false,i=>i.NavigationProperty
公共IEnumerable GetAll(表达式selectExp,
表达方式如下:,
表达式orderbyExp,
布尔递减,
参数表达式[]includeExps)
{
var查询=表。其中(whereExp);
query=!descending?query.OrderBy(orderbyExp):query.OrderByDescending(orderbyExp);
如果(includeExps!=null)
query=includeExps.Aggregate(query,(current,exp)=>current.Include(exp));
返回query.Select(selectExp.ToList();
}
以上方法只是一个例子,您应该根据需要重新创建它们