functions/Get-DbaSqlLog.ps1

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function Get-DbaSqlLog {
<#
    .SYNOPSIS
        Gets the "SQL Error Log" of an instance
     
    .DESCRIPTION
        Gets the "SQL Error Log" of an instance. Returns all 10 error logs by default.
 
    .PARAMETER SqlInstance
        The SQL Server instance, or instances.
     
    .PARAMETER SqlCredential
        Allows you to login to servers using SQL Logins as opposed to Windows Auth/Integrated/Trusted.
     
    .PARAMETER LogNumber
        An Int32 value that specifies the index number of the error log required. Error logs are listed 0 through 9 where 0 is the current error log and 9 is the oldest.
     
    .PARAMETER Silent
        Use this switch to disable any kind of verbose messages
     
    .NOTES
        Tags: Logging
        Website: https://dbatools.io
        Copyright: (C) Chrissy LeMaire, clemaire@gmail.com
        License: GNU GPL v3 https://opensource.org/licenses/GPL-3.0
     
    .LINK
        https://dbatools.io/Get-DbaSqlLog
     
    .EXAMPLE
        Get-DbaSqlLog -SqlInstance sql01\sharepoint
         
        Returns the entire error log for the SQL Server on sql01\sharepoint
 
    .EXAMPLE
        Get-DbaSqlLog -SqlInstance sql01\sharepoint -LogNumber 3, 6
         
        Returns log numbers 3 and 6 for the SQL Server on sql01\sharepoint
     
    .EXAMPLE
        $servers = "sql2014","sql2016", "sqlcluster\sharepoint"
        $servers | Get-DbaSqlLog -LogNumber 0
         
        Returns the most recent SQL Server error logs for "sql2014","sql2016" and "sqlcluster\sharepoint"
     
#>
    
    [CmdletBinding()]
    param (
        [Parameter(ValueFromPipeline = $true)]
        [Alias("ServerInstance", "SqlServer")]
        [DbaInstanceParameter[]]$SqlInstance,
        [Alias("Credential")]
        [PSCredential]
        $SqlCredential,
        [ValidateRange(0, 9)]
        [int[]]$LogNumber,
        [switch]$Silent
    )
    process {
        foreach ($instance in $SqlInstance) {
            Write-Message -Level Verbose -Message "Attempting to connect to $instance"
            
            try {
                $server = Connect-SqlInstance -SqlInstance $instance -SqlCredential $SqlCredential
            }
            catch {
                Stop-Function -Message "Failure" -Category ConnectionError -ErrorRecord $_ -Target $instance -Continue
            }
            
            if ($LogNumber) {
                foreach ($number in $lognumber) {
                    foreach ($object in $server.ReadErrorLog($number)) {
                        Write-Message -Level Verbose -Message "Processing $object"
                        Add-Member -Force -InputObject $object -MemberType NoteProperty ComputerName -value $server.NetName
                        Add-Member -Force -InputObject $object -MemberType NoteProperty InstanceName -value $server.ServiceName
                        Add-Member -Force -InputObject $object -MemberType NoteProperty SqlInstance -value $server.DomainInstanceName
                        
                        # Select all of the columns you'd like to show
                        Select-DefaultView -InputObject $object -Property ComputerName, InstanceName, SqlInstance, LogDate, ProcessInfo, Text
                    }
                }
            }
            else {
                foreach ($object in $server.ReadErrorLog()) {
                    Write-Message -Level Verbose -Message "Processing $object"
                    Add-Member -Force -InputObject $object -MemberType NoteProperty ComputerName -value $server.NetName
                    Add-Member -Force -InputObject $object -MemberType NoteProperty InstanceName -value $server.ServiceName
                    Add-Member -Force -InputObject $object -MemberType NoteProperty SqlInstance -value $server.DomainInstanceName
                    
                    # Select all of the columns you'd like to show
                    Select-DefaultView -InputObject $object -Property ComputerName, InstanceName, SqlInstance, LogDate, ProcessInfo, Text
                }
            }
        }
    }
}