/// <summary>
/// 更新单条数据
/// </summary>
/// <typeparam name="T">表的实体类</typeparam>
/// <param name="model">模型数据</param>
public static int Update <T>(T model) where T : class
{
try
{
int rows = 0;
using (var db = new DemoEntities())
{
if (db.Entry(model).State == EntityState.Detached)
{
db.Set <T>().Attach(model);
db.Entry(model).State = EntityState.Modified;
}
rows += db.SaveChanges();
}
return(rows);
}
catch (Exception ex)
{
WriteException(ex);
return(0);
}
}
/// <summary>
/// 删除单条数据
/// </summary>
/// <typeparam name="T">表的实体类</typeparam>
/// <param name="model">模型数据</param>
/// <returns>删除行数</returns>
public static int Delete <T>(T model) where T : class
{
try
{
int rows = 0;
using (var db = new DemoEntities())
{
db.Entry(model).State = EntityState.Deleted;
rows += db.SaveChanges();
}
return(rows);
}
catch (Exception ex)
{
WriteException(ex);
return(0);
}
}
/// <summary>
/// 使用查询条件更新数据
/// </summary>
/// <typeparam name="T">表的实体类</typeparam>
/// <param name="action">更新数据动作</param>
/// <param name="where">表达式</param>
public static int Update <T>(Action <T> action, Expression <Func <T, bool> > where) where T : class
{
try
{
int rows = 0;
using (var db = new DemoEntities())
{
var list = db.Set <T>().Where(where);
foreach (var model in list)
{
action.Invoke(model);
db.Entry(model).State = EntityState.Modified;
}
rows += db.SaveChanges();
}
return(0);
}
catch (Exception ex)
{
WriteException(ex);
return(0);
}
}
