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  • 通用的通过模型插入或更新数据库

    public class DALInsertUpdate<T> where T : new()
        {
            /// <summary>
            /// 通过模型把非(KeyAttribute)属性插入到指定表
            /// </summary>
            /// <param name="TableName">要插入到的表名</param>
            /// <param name="Model">要插入的模型</param>
            /// <returns></returns>
            public int Insert(string TableName, T Model)
            {
                var Name = new StringBuilder();
                var Value = new StringBuilder();
                var Parame = new List<SqlParameter>();
                PropertyInfo[] propertys = Model.GetType().GetProperties();
                foreach (var item in propertys)
                {
                    if (null==item.GetCustomAttribute(typeof(KeyAttribute)))
                    {
                        Name.Append(item.Name).Append(",");
                        Value.Append("@").Append(item.Name).Append(",");
                        Parame.Add(new SqlParameter("@"+item.Name,item.GetValue(Model, null)));
                    }
                }
                Name.Remove(Name.Length - 1, 1);
                Value.Remove(Value.Length - 1, 1);
                string Sql = string.Format("INSERT INTO {0} ({1})VALUES({2})", TableName, Name.ToString(), Value.ToString());
                return SqlHelper.ExecuteNonQuery(SqlHelper.GetConnSting(), CommandType.Text, Sql.ToString(), Parame.ToArray());
    
            }
            /// <summary>
            /// 通过模型更新指定(KeyAttribute)属性所指向的记录
            /// </summary>
            /// <param name="TableName">要更新的表名</param>
            /// <param name="Model">要更新的模型</param>
            /// <returns></returns>
            public int Update(string TableName, T Model)
            {
                PropertyInfo[] propertys = Model.GetType().GetProperties();
                var str = new StringBuilder();
                var where =new StringBuilder("");
                var Parame = new List<SqlParameter>();
                foreach (var item in propertys)
                {
                    if (null!=item.GetCustomAttribute(typeof(KeyAttribute)))
                    {
                        where.Append(item.Name).Append("=").Append("@").Append(item.Name);
                        Parame.Add(new SqlParameter("@" + item.Name, item.GetValue(Model, null)));
                        
                    }
                    else
                    {
                        str.Append(item.Name).Append("=@").Append(item.Name).Append(",");
                        Parame.Add(new SqlParameter("@" + item.Name, item.GetValue(Model, null)));
                    }
                }
                str.Remove(str.Length - 1, 1);
                if (string.IsNullOrEmpty(where.ToString())) throw new Exception("没有找到PrimaryKey,无法更新数据库!");
                string sql = string.Format("UPDATE {0} SET {1} WHERE {2} ", TableName, str.ToString(), where.ToString());
                return SqlHelper.ExecuteNonQuery(SqlHelper.GetConnSting(), CommandType.Text, sql.ToString(), Parame.ToArray());
            }
        }
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  • 原文地址:https://www.cnblogs.com/Qos8/p/5525804.html
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