Sql更新

        //要传一个DataSet,和若干个表
        /// <summary>
        /// 更新数据库
        /// </summary>
        /// <param name="dataSet">数据集</param>
        /// <param name="tableName">数据表</param>
        /// <returns>-1：失败；-2：无可更新数据；其他：成功</returns>
        public int UpdateDatabase(DataSet dataSet,params String[] tableName)
        {
            int saveCount = -1;
            //结束编辑
            for (int i = 0; i < tableName.Length; ++i)
            {
                this.BindingContext[dataSet, tableName[i]].EndCurrentEdit();
            }
            //检查变更//用一个东西存储所做的更改
            DataSet changes = (DataSet)dataSet.GetChanges();
            if (changes != null)
            {
                
                for (int j = 0; j < tableName.Length; ++j)
                {
                    //生成更新语句
                    string sqltext = "Select * From " + tableName[j] + " ";
                    //新建 一个连接
                    using (SqlConnection con = new SqlConnection(IConnectionString))     //这里要换成自己的连接字符串
                    {
                        //打开连接
                        con.Open();
                        //新建DA
                        using (SqlDataAdapter oDA = new SqlDataAdapter(sqltext, con))
                        {
                            try
                            {
                                //生成更新语句
                                SqlCommandBuilder sqlBuilder = new SqlCommandBuilder(oDA);
                                //更新数据库
                                saveCount += oDA.Update(changes, tableName[j]);
                            }
                            catch
                            { throw; }
                        }
                    }
                }
                //dataSet.Merge(changes );    //VS2015更新完成后会自动刷新数据，如果合并后会出现重复记录手动刷新后消失
                dataSet.AcceptChanges();
            }
            else
            {
                saveCount = -2;
            }
            return saveCount;
        }