批处理SQL语句检索多个表并填充DataSet

如果使用批处理SQL语句检索多个表并填充DataSet,第一个表用指定给Fill方法的表名命名。后面的表用指定给Fill方法的表名加上一个从1开始并且增量为1的数字命名。例如,如果运行下面的代码:

'Visual Basic
Dim da As SqlDataAdapter = New SqlDataAdapter("SELECT * FROM Customers; SELECT * FROM Orders;", myConnection)
Dim ds As DataSet = New DataSet()
da.Fill(ds, "Customers")

//C#
SqlDataAdapter da = new SqlDataAdapter("SELECT * FROM Customers; SELECT * FROM Orders;", myConnection);
DataSet ds = new DataSet();
da.Fill(ds, "Customers");

 

填充完DataSet之后,可以很容易地将“Customers1”表的TableName属性改为“Orders”。但是,后面的填充会导致“Customers”表被重新填充,而“Orders”表会被忽略,并创建另外一个“Customers1”表。为了对这种情况作出补救,创建一个DataTableMapping,将“Customers1”映射到“Orders”,并为其他后面的表创建其他的表映射。例如:

'Visual Basic
Dim da As SqlDataAdapter = New SqlDataAdapter("SELECT * FROM Customers; SELECT * FROM Orders;", myConnection)
da.TableMappings.Add("Customers1", "Orders")
Dim ds As DataSet = New DataSet()
da.Fill(ds, "Customers")

//C#
SqlDataAdapter da = new SqlDataAdapter("SELECT * FROM Customers; SELECT * FROM Orders;", myConnection);
da.TableMappings.Add("Customers1", "Orders");
DataSet ds = new DataSet();
da.Fill(ds, "Customers");

原文地址:https://www.cnblogs.com/kingwangzhen/p/1595196.html