/// <summary>获取分页集合(有条件无排序)
/// 获取分页集合(有条件无排序)
/// </summary>
/// <returns></returns>
public List <T> GetListPaged <T, Tkey>(int pageIndex, int pageSize, Expression <Func <T, bool> > seleWhere, out int totalcount) where T : class
{
using (SysDb <T> db = new SysDb <T>(strConn))
{
totalcount = db.Set <T>().AsExpandable().Where(seleWhere).Count();//获取总数
//需要增加AsExpandable(),否则查询的是所有数据到内存，然后再排序 AsExpandable是linqkit.dll中的方法
return(db.Set <T>().AsExpandable().Where(seleWhere).Skip((pageIndex - 1) * pageSize).Take(pageSize).ToList());
}
}
/// <summary>获取分页集合(无条件多字段排序)
/// 获取分页集合(无条件多字段排序)
/// </summary>
/// <returns></returns>
public List <T> GetListPaged <T>(int pageIndex, int pageSize, out int totalcount, params OrderModelField[] orderByExpression) where T : class
{
using (SysDb <T> db = new SysDb <T>(strConn))
{
totalcount = db.Set <T>().AsExpandable().Count();//获取总数
//需要增加AsExpandable(),否则查询的是所有数据到内存，然后再排序 AsExpandable是linqkit.dll中的方法
return(CommonSort(db.Set <T>().AsExpandable(), orderByExpression).Skip((pageIndex - 1) * pageSize).Take(pageSize).ToList());
}
}
/// <summary> 查找单个
/// 查找单个
/// </summary>
/// <param name="id">主键</param>
/// <returns></returns>
public T GetSingleById <T>(int id) where T : class
{
using (SysDb <T> db = new SysDb <T>(strConn))
{
return(db.Set <T>().Find(id));
}
}
/// <summary>根据条件查询实体集合(多个字段排序)
/// 根据条件查询实体集合(多个字段排序)
/// </summary>
/// <param name="seleWhere">查询条件 lambel表达式</param>
/// <returns></returns>
public List <T> GetList <T>(Expression <Func <T, bool> > seleWhere, params OrderModelField[] orderByExpression) where T : class
{
using (SysDb <T> db = new SysDb <T>(strConn))
{
return(CommonSort(db.Set <T>().AsExpandable().Where(seleWhere), orderByExpression).ToList());
}
}
/// <summary>根据条件查询实体集合
/// 根据条件查询实体集合
/// </summary>
/// <param name="seleWhere">查询条件 lambel表达式</param>
/// <returns></returns>
public List <T> GetList <T, TValue>(Expression <Func <T, TValue> > seleWhere, IEnumerable <TValue> conditions) where T : class
{
using (SysDb <T> db = new SysDb <T>(strConn))
{
return(db.Set <T>().AsExpandable().WhereIn <T, TValue>(seleWhere, conditions).ToList());
}
}
/// <summary>根据条件查询实体集合(单个字段排序)
/// 根据条件查询实体集合(单个字段排序)
/// </summary>
/// <param name="seleWhere">查询条件 lambel表达式</param>
/// <returns></returns>
public List <T> GetList <T, Tkey>(Expression <Func <T, bool> > seleWhere, Expression <Func <T, Tkey> > orderWhere, bool isDesc) where T : class
{
using (SysDb <T> db = new SysDb <T>(strConn))
{
return(CommonSort(db.Set <T>().AsExpandable().Where(seleWhere), orderWhere, isDesc).ToList());
}
}
/// <summary>/ 根据条件查询实体集合
/// 根据条件查询实体集合
/// </summary>
/// <param name="seleWhere">查询条件 lambel表达式</param>
/// <returns></returns>
public List <T> GetList <T>(Expression <Func <T, bool> > seleWhere) where T : class
{
using (SysDb <T> db = new SysDb <T>(strConn))
{
return(db.Set <T>().AsExpandable().Where(seleWhere).ToList());
}
}
/// <summary>获取所有实体集合(多个排序)AsNoTracking
/// 获取所有实体集合(多个排序)AsNoTracking
/// </summary>
/// <returns></returns>
public List <T> GetAllAsNoTracking <T>(params OrderModelField[] orderByExpression) where T : class
{
using (SysDb <T> db = new SysDb <T>(strConn))
{
return(CommonSort(db.Set <T>().AsExpandable().AsNoTracking(), orderByExpression).ToList());
}
}
/// <summary> 获取所有实体集合(单个排序)AsNoTracking
/// 获取所有实体集合(单个排序)AsNoTracking
/// </summary>
/// <returns></returns>
public List <T> GetAllAsNoTracking <T, Tkey>(Expression <Func <T, Tkey> > orderWhere, bool isDesc) where T : class
{
using (SysDb <T> db = new SysDb <T>(strConn))
{
return(CommonSort(db.Set <T>().AsExpandable().AsNoTracking(), orderWhere, isDesc).ToList <T>());
}
}
/// <summary>获取所有实体集合AsNoTracking
/// 获取所有实体集合AsNoTracking
/// </summary>
/// <returns></returns>
public List <T> GetAllAsNoTracking <T>() where T : class
{
using (SysDb <T> db = new SysDb <T>(strConn))
{
return(db.Set <T>().AsExpandable().AsNoTracking().ToList <T>());
}
}
/// <summary>查找单个
/// 查找单个
/// </summary>
/// <param name="seleWhere">查询条件</param>
/// <returns></returns>
public T GetSingle <T>(Expression <Func <T, bool> > seleWhere) where T : class
{
using (SysDb <T> db = new SysDb <T>(strConn))
{
return(db.Set <T>().AsExpandable().FirstOrDefault(seleWhere));
}
}
/// <summary>根据条件删除
/// 根据条件删除
/// </summary>
/// <param name="deleWhere">删除条件</param>
/// <returns>返回受影响行数</returns>
public bool DeleteByConditon <T>(Expression <Func <T, bool> > deleWhere) where T : class
{
using (SysDb <T> db = new SysDb <T>(strConn))
{
List <T> entitys = db.Set <T>().Where(deleWhere).ToList();
entitys.ForEach(m => db.Entry <T>(m).State = EntityState.Deleted);
return(db.SaveChanges() > 0);
}
}
/// <summary>删除
/// 删除
/// </summary>
/// <param name="entity">实体</param>
/// <returns>返回受影响行数</returns>
public bool Delete <T>(T entity) where T : class
{
using (SysDb <T> db = new SysDb <T>(strConn))
{
db.Set <T>().Attach(entity);
db.Entry <T>(entity).State = EntityState.Deleted;
return(db.SaveChanges() > 0);
}
}
/// <summary>批量删除
/// 批量删除
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="Iqueryable"></param>
/// <returns></returns>
public int DeleteEx <T>(Expression <Func <T, bool> > expression) where T : class
{
using (SysDb <T> db = new SysDb <T>(strConn))
{
IQueryable <T> Iqueryable = db.Set <T>().Where(expression);
int intResult = Iqueryable.Delete();
return(intResult);
//或者
// db.tb.Delete(u => u.name == "101");
//不需要db.SaveChanges();
}
}
/// <summary>批量更新
/// 批量更新
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="Iqueryable"></param>
/// <param name="updateExpression"></param>
/// <returns></returns>
public int UpdateEx <T>(Expression <Func <T, bool> > expression, Expression <Func <T, T> > updateExpression) where T : class
{
using (SysDb <T> db = new SysDb <T>(strConn))
{
IQueryable <T> Iqueryable = db.Set <T>().Where(expression);
int intResult = Iqueryable.Update(updateExpression);
return(intResult);
//db.tb.Update(
// u => u.name.Contains("2"),
// u2 => new tb { password = "******" });
//或者 db.tb.Where(u => u.name == "2").Update(u => new tb { password = "******" });
//不需要db.SaveChanges();
}
}
