Jun 8, 2026, 10:09 AM

toolbox/Modules/SQLManager.psm1

@@ -1,3 +1,9 @@
+try {
+    Add-Type -AssemblyName System.Data
+} catch {
+    # Ignore if already loaded or not available in some environments
+}
+
 function Import-DBAToolBoxDependencies {
     <#
     .SYNOPSIS
@@ -33,9 +39,9 @@ function Test-SQLConnection {
         $reader = $cmd.ExecuteReader()
         
         if ($reader.Read()) {
-            $ver = $reader["VerString"].ToString()
+            $ver = if ($reader["VerString"] -ne [System.DBNull]::Value -and $reader["VerString"] -ne $null) { $reader["VerString"].ToString() } else { "Unknown" }
-            $edition = $reader["Edition"].ToString()
+            $edition = if ($reader["Edition"] -ne [System.DBNull]::Value -and $reader["Edition"] -ne $null) { $reader["Edition"].ToString() } else { "Unknown" }
-            $instance = $reader["Instance"].ToString()
+            $instance = if ($reader["Instance"] -ne [System.DBNull]::Value -and $reader["Instance"] -ne $null) { $reader["Instance"].ToString() } else { "" }
             
             return @{
                 Success = $true
@@ -50,7 +56,7 @@ function Test-SQLConnection {
     } catch {
         return @{ Success = $false; Error = $_.Exception.Message }
     } finally {
-        if ($null -ne $connection -and $connection.State -eq [System.Data.ConnectionState]::Open) {
+        if ($null -ne $connection -and $connection.State.ToString() -eq "Open") {
             $connection.Close()
         }
     }
@@ -71,9 +77,19 @@ function Get-SQLDatabases {
     try {
         $connection.Open()
         
-        # Query databases from sys.databases
+        # Query databases from sys.databases joined with sys.master_files to correctly sum file sizes.
+        # sys.databases does not have a "size" column. We must group and sum size from sys.master_files.
         $cmd = $connection.CreateCommand()
-        $cmd.CommandText = "SELECT name, state_desc, (size * 8.0 / 1024.0) as size_mb, recovery_model_desc FROM sys.databases"
+        $cmd.CommandText = @"
+SELECT 
+    d.name, 
+    d.state_desc, 
+    COALESCE(SUM(CAST(f.size AS FLOAT) * 8.0 / 1024.0), 0.0) as size_mb, 
+    d.recovery_model_desc 
+FROM sys.databases d
+LEFT JOIN sys.master_files f ON d.database_id = f.database_id
+GROUP BY d.name, d.state_desc, d.recovery_model_desc
+"@
         
         $adapter = New-Object System.Data.SqlClient.SqlDataAdapter($cmd)
         $table = New-Object System.Data.DataTable
@@ -81,18 +97,27 @@ function Get-SQLDatabases {
         
         $dbList = @()
         foreach ($row in $table.Rows) {
+            $sizeVal = 0.0
+            if ($row.size_mb -ne [System.DBNull]::Value -and $row.size_mb -ne $null) {
+                $sizeVal = [double]$row.size_mb
+            }
+            
+            $dbName = if ($row.name -ne [System.DBNull]::Value -and $row.name -ne $null) { $row.name.ToString() } else { "Unknown" }
+            $dbStatus = if ($row.state_desc -ne [System.DBNull]::Value -and $row.state_desc -ne $null) { $row.state_desc.ToString() } else { "Unknown" }
+            $dbRecovery = if ($row.recovery_model_desc -ne [System.DBNull]::Value -and $row.recovery_model_desc -ne $null) { $row.recovery_model_desc.ToString() } else { "Simple" }
+
             $dbList += [pscustomobject]@{
-                Name = $row.name
+                Name = $dbName
-                Status = $row.state_desc
+                Status = $dbStatus
-                Size = "$([Math]::Round([double]$row.size_mb, 2)) MB"
+                Size = "$([Math]::Round($sizeVal, 2)) MB"
-                RecoveryModel = $row.recovery_model_desc
+                RecoveryModel = $dbRecovery
             }
         }
         return $dbList
     } catch {
         throw "Failed to get databases: $($_.Exception.Message)"
     } finally {
-        if ($null -ne $connection -and $connection.State -eq [System.Data.ConnectionState]::Open) {
+        if ($null -ne $connection -and $connection.State.ToString() -eq "Open") {
             $connection.Close()
         }
     }