Database query output to CSV - oracle

Question

Below is my PowerShell code and it is working fine.
[Reflection.Assembly]::LoadFile("E:\oracle\product\11.2.0\ODP.NET\bin\2.x\Oracle.DataAccess.dll")
$constr = "User Id=system;Password=pass;Data Source=API"
$conn= New-Object Oracle.DataAccess.Client.OracleConnection($constr)
$conn.Open()
$sql="select * from dba_users"
$command = New-Object Oracle.DataAccess.Client.OracleCommand($sql,$conn)
$reader=$command.ExecuteReader()
while($reader.Read()){
$reader.GetString(0)
}
$conn.Close()
The problem is I want to export result to CSV. How to do this in PowerShell? Also, how can I show it in tabular format in PowerShell screen or output?

Answer 1

I have done something like this in the past I havent exported it as a csv but it should work.
$someArray = #()
#read all rows into a hash table
while ($reader.Read())
{
$row = #{}
for ($i = 0; $i -lt $reader.FieldCount; $i++)
{
$row[$reader.GetName($i)] = $reader.GetValue($i)
}
#convert hashtable into an array of PSObjects
$someArray += new-object psobject -property $row
}
$conn.Close()
$someArray | export-csv C:\temp\someFile.csv

Answer 2

Build custom objects from the fields of each record, then export the list of objects to a CSV:
$colNames = $reader.GetSchemaTable() | select -Expand ColumnName
$data = while ($reader.Read()) {
$obj = New-Object -Type PSCustomObject
for ($i = 0; $i -lt $colNames.Count; $i++) {
$obj | Add-Member -Type NoteProperty -Name $colNames[$i] -Value $reader.GetString($i)
}
$obj
}
$data | Export-Csv 'C:\path\to\output.csv' -NoType
Code adopted from here (about halfway down the page, but you may want to read the article in its entirety).
Pipe the data into Format-Table to get tabular output in the PowerShell console:
$data | Format-Table -AutoSize