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Abraham Olatubosun
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113.4k
How to Loop and Update SQL Table Summing any existing Values
May 17 2016 7:23 AM
i thnak you all for the great support you gave me as it is i still need your support again.
i want to retrive records from a tableA and update tableB i need the value in tableB to sum if it find any value in the values field; i have tried using the code below :
DataTable dt = GetDatafromDatabase(); //===== returns a DataTable
string SQLT = "SELECT * FROM tbl_TempReport";
string colname;
if (cn.State == ConnectionState.Closed)
{
cn.Open();
}
SqlCommand cmdT = new SqlCommand(SQLT, cn);
SqlDataReader rt = cmdT.ExecuteReader();
while (rt.Read())
{
// For each row, print the values of each column.
foreach (DataColumn column in dt.Columns)
{
foreach (DataRow row in dt.Rows)
{
colname = column.ColumnName.ToString();
int mValue = 0;
string m_Code = rt["code"].ToString();
if (m_Code == colname)
{
if (m_Code == colname && mValue > 0) { mValue += Convert.ToInt32(row[column].ToString()); } else { mValue = Convert.ToInt32(row[column].ToString()); }
//============ insert into tbl_TempReport to match the appropriate column
string SQLP = "UPDATE tbl_TempReport SET VALUEP = @VALUEP WHERE code = @code";
SqlCommand cmdp = new SqlCommand(SQLP, cn);
cmdp.Parameters.AddWithValue("@VALUEP", SqlDbType.Int).Value = mValue;
cmdp.Parameters.AddWithValue("@code", SqlDbType.NVarChar).Value = rt["code"].ToString();
cmdp.ExecuteNonQuery();
}
}
}
}
Please i appreciate any help. Thank you all
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