同时执行插入和更新dataset时出现“违反并发性”，如何解决？
如下代码：
For i As Integer = 1 To weaTypes.Length
For j As Integer = 1 To names.Length
For k As Integer = 1 To Tlevs.Length
'首先添加日期, 名称的空记录
TmpSql = "forecastdate=#" + nowDate.ToShortDateString + "# and " + "weatherType='" + weaTypes(i - 1) + "' and AreaName='" + names(j - 1) + "'"
fcDR = basinDS.Tables("yb").NewRow
If basinDS.Tables("yb").Select(TmpSql).Count = 0 Then

fcDR(1) = nowDate.ToShortDateString : fcDR(2) = names(j - 1) : fcDR(3) = weaTypes(i - 1)
basinDS.Tables("yb").Rows.Add(fcDR)
acsDA.Update(basinDS.Tables("yb"))
End If
basinDS.Tables("yb").Select(TmpSql)(0)(k + 3) = "F0"
acsDA.Update(basinDS.Tables("yb"))
Next
Next
Next
目的是首先检索数据库记录的记录标识（日期，类型，名字），如果没有符合的记录则添加一个记录标识，然后更新剩余的列值；如果有符合的记录则直接更新剩余的列值，但是在添加了第一个记录的标识后马上更新剩余列值时就提示：“违反并发性”，请问如何解决？


[解决办法]

VB.NET code

For i As Integer = 1 To weaTypes.Length   For j As Integer = 1 To names.Length   For k As Integer = 1 To Tlevs.Length   '首先添加日期, 名称的空记录   TmpSql = "forecastdate=#" + nowDate.ToShortDateString + "# and " + "weatherType='" + weaTypes(i - 1) + "' and AreaName='" + names(j - 1) + "'"      If basinDS.Tables("yb").Select(TmpSql).Count = 0 Then   fcDR = basinDS.Tables("yb").NewRow   fcDR(1) = nowDate.ToShortDateString : fcDR(2) = names(j - 1) : fcDR(3) = weaTypes(i - 1)   basinDS.Tables("yb").Rows.Add(fcDR)   End If   basinDS.Tables("yb").Select(TmpSql)(0)(k + 3) = "F0"   acsDA.Update(basinDS.Tables("yb"))      Next   Next   Next
[解决办法]
改写dataset里面每一个datatable的update语句，把where后面的条件大多数去掉，只保留主键=@主键.这样就不会涉及到全表更新了。