Question

所以目前有一些代码是SQL，它返回一个表，其中包含两个表之间的差异。因此它返回一个表，该表只包含两个表之间具有不同数据的行。表格在不同的环境中完全相同。我想知道如何从SQL加载的DataTable中返回包含不同数据的列名？

以下是DataTable填充位置的一小部分：

crs.DataHasChanged = ChangeState.False;
//Compare data of two tables.
sql = "Select 'Source Diff' as CompareDiff, " + BuildColumns(colIncludes, "C1", textColName) + " From " + sourceServer + "." + sourceDB + ".dbo." + tableStateObj.TableName + " C1 ";
sql += "EXCEPT ";
sql += "Select 'Source Diff' as CompareDiff, " + BuildColumns(colIncludes, "C2", textColName) + " From " + destServer + "." + destDB + ".dbo." + tableStateObj.TableName + " C2 ";
sql += "UNION ";
sql += "Select 'Dest Diff' as CompareDiff, " + BuildColumns(colIncludes, "C2", textColName) + " From " + destServer + "." + destDB + ".dbo." + tableStateObj.TableName + " C2 ";
sql += "EXCEPT ";
sql += "Select 'Dest Diff' as CompareDiff, " + BuildColumns(colIncludes, "C1", textColName) + " From " + sourceServer + "." + sourceDB + ".dbo." + tableStateObj.TableName + " C1 ";
sql += "Order By 2,3";

ds = new DataSet();
using (SqlDataAdapter da = new SqlDataAdapter(sql, compareConnString))
{
    da.Fill(ds);
}
if (ds.Tables[0].Rows.Count > 0)
{
    crs.DataHasChanged = ChangeState.True;
}
crs.DataChangeTable = ds.Tables[0];

Answer 1

为了知道哪个列不同，您需要仔细阅读它们。好像你有4个工会？比较2列C1和C2。啊。逻辑需要一段时间来弄明白。

Answer 2

下面显示的是帮助我走上正确道路的原因，但这里的代码实际上对我有用：

ds = new DataSet();
using (SqlDataAdapter da = new SqlDataAdapter(sql, compareConnString))
{
    da.Fill(ds);
}
if (ds.Tables[0].Rows.Count > 0)
{
    int rowCount = ds.Tables[0].Rows.Count;
    int rowsRemaining = rowCount;

    for (int i = 0; i < rowCount; i+=2)
    {
        if (!(rowsRemaining == 1))
        {
            var row1 = ds.Tables[0].Rows[i];
            var row2 = ds.Tables[0].Rows[i + 1];

            if (row1[1].ToString() == row2[1].ToString())
            {
                foreach (DataColumn col in ds.Tables[0].Columns)
                {
                    if (col.ColumnName != "CompareDiff")
                    {
                        if (row1[col].ToString() != row2[col].ToString())
                        {
                            crs.ColumnsChanged.Add(col.ColumnName);
                        }
                     }
                  }
              }
          }

          rowsRemaining -= 2;
      }

可能会重构以提高效率，但我现在对结果感到满意。希望这将有助于其他任何有此问题的人。

获取具有DataTable差异的列

2 个答案: