ADO.NET - 更新多个DataTable

Question

所以我有一些像这样的代码:

        DataSet dataSet = new DataSet();            
        DataTable dataTable1 = new DataTable("Table1");
        DataTable dataTable2 = new DataTable("Table2");
        DataTable dataTable3 = new DataTable("Table3");
        DataTable dataTable4 = new DataTable("Table4");
        dataSet.Tables.Add(dataTable1);
        dataSet.Tables.Add(dataTable2);
        dataSet.Tables.Add(dataTable3);
        dataSet.Tables.Add(dataTable4);

        SqlDataAdapter dataAdapter1 = new SqlDataAdapter("SELECT * FROM Table1 WHERE ID = 1", sqlConnection);
        SqlDataAdapter dataAdapter2 = new SqlDataAdapter("SELECT Column1, Column2, Column3 FROM Table2", sqlConnection);
        SqlDataAdapter dataAdapter3 = new SqlDataAdapter("SELECT Column1, Column2, Column3 FROM Table3", sqlConnection);
        SqlDataAdapter dataAdapter4 = new SqlDataAdapter("SELECT Column1, Column2, Column3 FROM Table4", sqlConnection);

        SqlCommandBuilder commandBuilder1 = new SqlCommandBuilder(dataAdapter1);
        SqlCommandBuilder commandBuilder2 = new SqlCommandBuilder(dataAdapter2);
        SqlCommandBuilder commandBuilder3 = new SqlCommandBuilder(dataAdapter3);
        SqlCommandBuilder commandBuilder4 = new SqlCommandBuilder(dataAdapter4);            

        dataAdapter1.Fill(dataTable1);
        dataAdapter2.FillSchema(dataTable2, SchemaType.Source);
        dataAdapter3.FillSchema(dataTable3, SchemaType.Source);
        dataAdapter4.FillSchema(dataTable4, SchemaType.Source);

        //do a bunch of code that updates the one row from Table1
        //and adds lots of new rows to Table2, Table3, Table4

        dataAdapter1.Update(dataTable1);
        dataAdapter2.Update(dataTable2);
        dataAdapter3.Update(dataTable3);
        dataAdapter4.Update(dataTable4);
        dataSet.AcceptChanges();

反正有没有让这更简单？如果计算机在"dataAdapter2.Update(dataTable2);"之后崩溃了,会发生什么？我希望能够以某种方式使用一个更新调用来更新所有内容.那可能吗？

此外,这甚至是最好的方法吗？"this"在多个表中创建一堆新行,具体取决于一个特定表中某个特定行的内容.

Answer 1

您可以将数据集传递到DataAdapter的Update语句,该语句将更新数据集中的所有表.更新:不,它没有.DataAdapter始终只更新一个表.从MSDN文档中以DataSet作为参数的Update()重载"从名为"Table"的DataTable中为指定DataSet中的每个插入,更新或删除的行调用相应的INSERT,UPDATE或DELETE语句".对困惑感到抱歉.然而,答案的其余部分仍然有效.

如果要确保所有更新都作为原子单元成功或失败,请使用SqlTransaction对象:

DataSet ds = new DataSet();
// do something with the dataset

SqlDataAdapter dataAdapter = new SqlDataAdapter();
SqlConnection cn = new SqlConnection(connString);
cn.Open();

SqlTransaction trans = cn.BeginTransaction();

SqlDataAdapter dataAdapter = new SqlDataAdapter();

// set the InsertCommand, UpdateCommand, and DeleteCommand for the data adapter

dataAdapter.InsertCommand.Transaction = trans;
dataAdapter.UpdateCommand.Transaction = trans;
dataAdapter.DeleteCommand.Transaction = trans;

try
{
    dataAdapter.Update( ds );
    trans.Commit();
}
catch
{
    trans.Rollback();
}

cn.Close();