Dataset to CSV
Hello
I have a situation here
I need to query around 300,000 or more rows of data and save the same in csv format. Right now i am running a code but it is successful till 1,50,000 rows. Please tell me any way to get the whole data in optimized format.
On database i have only select privilage so cannot create Stored procedures;.
thanks and sos
Senz
I have a situation here
I need to query around 300,000 or more rows of data and save the same in csv format. Right now i am running a code but it is successful till 1,50,000 rows. Please tell me any way to get the whole data in optimized format.
On database i have only select privilage so cannot create Stored procedures;.
thanks and sos
Senz
public void ExecuteSQL(string Query, string strConn)
{
try
{
DataSet dsTable = new DataSet();
if (strConn == "Success")
{
objClsDB.conDB2.ConnectionTimeout = 0;
objClsDB.conDB2.Open();
objClsDB.cmdDB2.CommandText = Query;
//OleDbDataAdapter da = new OleDbDataAdapter(objClsDB.cmd.CommandText, objClsDB.con);
//OleDbCommandBuilder cBuilder = new OleDbCommandBuilder(da);
DB2DataAdapter da = new DB2DataAdapter(objClsDB.cmdDB2.CommandText, objClsDB.conDB2);
DB2CommandBuilder cBuilder = new DB2CommandBuilder(da);
DataTable QTable = new DataTable();
QTable.Locale = System.Globalization.CultureInfo.InvariantCulture;
da.SelectCommand.CommandTimeout = 5000;
da.Fill(dsTable, "RCCM");
//da.Fill(QTable);
objClsDB.cmdDB2.Dispose();
objClsDB.conDB2.Close();
objClsDB.conDB2.Dispose();
//dgReportResult.DataSource = dsTable;
//dgReportResult.AutoResizeColumns(DataGridViewAutoSizeColumnsMode.AllCells);
if (dgReportResult.RowCount > 1)
{
if (Directory.Exists(@"C:\RCCM"))
{
DataTable dtTable = dsTable.Tables[0];
RKLib.ExportData.Export objExport = new RKLib.ExportData.Export("Win");
objExport.ExportDetails(dtTable, Export.ExportFormat.CSV, "C:\\RCCM\\RCCM_Report.csv");
dsTable.Clear();
MessageBox.Show(@"RCCM Repository Created at C:\RCCM\.Remove the file to other location to save data.");
}
else
{
Directory.CreateDirectory(@"C:\RCCM");
MessageBox.Show(@"RCCM Repository Created at C:\RCCM.All the reports will be generated at the created location.");
}
}
}
else
{
}
}
catch (Exception Ex)
{
MessageBox.Show(Ex.Message);
}
}
da.Fill will try to fill all the data in the DataSet and when data is large, this will take more resources and might slow down the system and even might cause issues like yours....
Alternatively try using DataReader....
ASKER
There are around 20 columns from which data is extracted i.e the output will have 20 columns will dataraeader help, Please assist
Select
db2inst1.cm_computer_systems_v.IP_ADDRESS_STRING as IP_Address,
db2inst1.cm_computer_systems_v.FDQN as Domain_Name,
db2inst1.cm_computer_systems_v.SYSTEM_TYPE as Server_Type,
db2inst1.cm_computer_systems_v.FILE_SYSTEM as File_System,
db2inst1.cm_computer_systems_v.OS_NAME as Operating_System_Name,
db2inst1.BB_OPERATINGSYSTEM62_V.OSVERSION_C as Operating_System_Version,
db2inst1.cm_computer_systems_v.CPU_TYPE as CPU_Type,
db2inst1.cm_computer_systems_v.NUM_CPUS as Number_Of_CPU,
db2inst1.cm_computer_systems_v.CPU_SPEED as CPU_Speed,
db2inst1.cm_computer_systems_v.MEMORY_SIZE as Memory_Size,
db2inst1.cm_computer_systems_v.AVAILABLE_SPACE as Available_Space,
db2inst1.cm_computer_systems_v.MANUFACTURER as Manufacturer,
db2inst1.cm_computer_systems_v.MODEL as Model,
db2inst1.cm_computer_systems_v.SERIAL_NUMBER as Serial_Number,
db2inst1.CM_APP_SERVERS_PER_HOST_V.TYPE As Software_Type,
db2inst1.CM_APP_SERVERS_PER_HOST_V.PRODUCT_NAME as Software_Product_Name,
db2inst1.CM_APP_SERVERS_PER_HOST_V.PRODUCT_VERSION as Software_Product_Version,
db2inst1.CM_APP_SERVERS_PER_HOST_V.NAME,
db2inst1.CM_APP_SERVERS_PER_HOST_V.CLASS_NAME,
db2inst1.CM_APP_SERVERS_PER_HOST_V.KEY_NAME,
db2inst1.BB_OPERATINGSYSTEM62_V.KERNELARCHITECTURE_C as Kernel_Architecture,
db2inst1.BB_OPERATINGSYSTEM62_V.KERNELVERSION_C as Version,
db2inst1.BB_COMPUTERSYSTEM40_V.ARCHITECTURE_C as Architecture,
db2inst1.BB_COMPUTERSYSTEM40_V.CREATEDBY_C as Created_By,
db2inst1.BB_COMPUTERSYSTEM40_V.LASTMODIFIEDTIME_C as Last_Modified,
db2inst1.BB_COMPUTERSYSTEM40_V.SIGNATURE_C as Signature,
db2inst1.BB_COMPUTERSYSTEM40_V.LASTMODIFIEDTIME_C as Scan_Date
from
db2inst1.cm_computer_systems_v
Left Outer Join db2inst1.BB_OPERATINGSYSTEM62_V on db2inst1.cm_computer_systems_v.FDQN = db2inst1.BB_OPERATINGSYSTEM62_V.DISPLAYNAME_C
Left Outer Join db2inst1.BB_COMPUTERSYSTEM40_V on db2inst1.cm_computer_systems_v.FDQN = db2inst1.BB_COMPUTERSYSTEM40_V.DISPLAYNAME_C
Left Outer Join db2inst1.CM_APP_SERVERS_PER_HOST_V on db2inst1.cm_computer_systems_v.FDQN = db2inst1.CM_APP_SERVERS_PER_HOST_V.FQDN
Where
db2inst1.cm_computer_systems_v.IP_ADDRESS_STRING IS NOT NULL
order by db2inst1.cm_computer_systems_v.FDQN desc
It would not be an issue, you can write to csv file even without knowing how many columns are there and without knowing the col names. sample code is below:
string connString = "conn string here";
using (OleDbConnection conn = new OleDbConnection(connString))
{
conn.Open();
string sqlQuery = "SELECT query here.....";
OleDbCommand command = new OleDbCommand(sqlQuery, conn);
OleDbDataReader reader = command.ExecuteReader();
TextWriter textWriter = new StreamWriter("RCCM_Report.csv");
// write column headers if you want
while (reader.Read())
{
StringBuilder sb = new StringBuilder();
for (int f = 0; f < reader.FieldCount; f++)
{
string fieldValue = reader[f].ToString();
if(fieldValue.Contains(',')) // if value contains comma, enclose the value within quotes
{
fieldValue = "\"" + fieldValue + "\"";
}
sb.Append(fieldValue);
sb.Append(",");
}
textWriter.WriteLine(sb.ToString());
}
reader.Close();
}
Plus to make it more user responsive....you can put this code in a thread and show a progressbar/cancel and in the loop handle the cancel and progress update....
ASKER
great let me try i will take some time.....
ASKER
It Worked Awesome but is it possible to keep the header or the column names too.
ASKER CERTIFIED SOLUTION
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ASKER
da.Fill(dsTable, "RCCM");