BaseRepository | 易学教程

public class BaseRepository<T, TS> where T : class where TS : DbContext, new()
{
//当前操作数据库的实例
private DbContext db = DbContextFactory<TS>.GetCurrentDbContext();

/// <summary>
/// 单表的添加一条记录
/// </summary>
/// <param name="entity"></param>
/// <returns></returns>
public bool Add(T entity)
{
//将实例添加到上下文中
db.Set<T>().Add(entity);
//保存更改
return db.SaveChanges() > 0;
}

/// <summary>
/// 单表的添加多条记录
/// </summary>
/// <param name="entity"></param>
/// <returns></returns>
public bool AddRange(List<T> entities)
{
//将实例添加到上下文中
db.Set<T>().AddRange(entities);
//保存更改
return db.SaveChanges() > 0;
}

/// <summary>
/// 删除
/// </summary>
/// <param name="entity"></param>
/// <returns></returns>
public bool Delete(T entity)
{
//设置删除状态
db.Entry(entity).State = EntityState.Deleted;
//保存更改
return db.SaveChanges() > 0;
}

/// <summary>
///删除多个实体
/// </summary>
/// <param name="entity"></param>
/// <returns></returns>
public bool BatchDelete(List<T> entities)
{
//批量删除
db.Set<T>().RemoveRange(entities);
//保存更改
return db.SaveChanges() > 0;
}

/// <summary>
///删除多个实体根据Id
/// </summary>
/// <param name="entity"></param>
/// <returns></returns>
public bool BatchDeleteById(params int[] ids)
{
foreach (var id in ids)
{
//查找主键值的实体
var entity = db.Set<T>().Find(id);
if (entity != null)
{
db.Set<T>().Remove(entity);
}
}
//保存更改
return db.SaveChanges() > 0;
}

/// <summary>
/// 修改
/// </summary>
/// <param name="entity"></param>
/// <returns></returns>
public bool Update(T entity)
{
//设置修改状态
db.Entry(entity).State = EntityState.Modified;
//保存更改
return db.SaveChanges() > 0;
}

/// <summary>
/// 查询返回一个集合
/// </summary>
/// <param name="entity"></param>
/// <returns></returns>
public List<T> QueryList(Expression<Func<T, bool>> lambdaExpression)
{
return db.Set<T>().Where(lambdaExpression).ToList();
}

/// <summary>
/// 查询返回一个对象,没有返回null---根据主键查
/// </summary>
/// <param name="entity"></param>
/// <returns></returns>
public T Query(Expression<Func<T, bool>> lambdaExpression)
{
return db.Set<T>().SingleOrDefault(lambdaExpression);
}

/// <summary>
///判断是否存在
/// </summary>
/// <param name="entity"></param>
/// <returns></returns>
public bool Exists(Expression<Func<T, bool>> lambdaExpression)
{
return db.Set<T>().Any(lambdaExpression);
}

/// <summary>
/// 分页查询
/// </summary>
/// <param name="entity"></param>
/// <returns></returns>
public List<T> QueryPageList<S>(int pageIndex, int pageSize, Expression<Func<T, bool>> whereLambda, Expression<Func<T, S>> orderbyLambda, out int count, bool isAsc = true)
{
//获取总数
count = db.Set<T>().Where(whereLambda).Count();
if (!isAsc)
{
return db.Set<T>().Where(whereLambda)
.OrderByDescending(orderbyLambda)
.Skip((pageIndex - 1) * pageSize)
.Take(pageSize).ToList();
}
return db.Set<T>().Where(whereLambda)
.OrderBy(orderbyLambda)
.Skip((pageIndex - 1) * pageSize)
.Take(pageSize).ToList();
}
}

来源：CSDN

作者：黑人问号？

链接：https://blog.csdn.net/weixin_45408840/article/details/104704353

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