Use Case
Occasionally when managing large numbers of SQL Instances and thousands of databases, you have to do some checks prior to running a query against them. One of the ways of ensuring you’re querying the right sort of database is checking if a specific table exists.
This function checks if a table exists by checking the database schema. I’ve seen other functions which query the table itself and check if the result is or isn’t null but this seems more elegant.
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| function Test-SQLTableExists | |
| { | |
| param ($Instance,$Database,$TableName) | |
| $Return = $SQL = $dataTable = $null | |
| $sql = "SELECT * FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_NAME = N'$TableName'" | |
| $dataTable = Invoke-Sqlcmd2 –ServerInstance $Instance –Database $Database –Query $sql | |
| if ($dataTable) {$return = $true} | |
| else {$return = $false} | |
| $Return | |
| } |