Functions/GenXdev.Data.SQLite/Get-SQLiteViewSchema.ps1

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<#
.SYNOPSIS
Retrieves the SQL schema definition for a SQLite view.
 
.DESCRIPTION
This function queries the SQLite database's system tables to extract the SQL
definition of a specified view. It supports connecting via either a connection
string or direct database file path and returns the complete SQL schema that
defines the requested view.
 
.PARAMETER ConnectionString
The connection string used to connect to the SQLite database. This parameter is
mutually exclusive with DatabaseFilePath.
 
.PARAMETER DatabaseFilePath
The full path to the SQLite database file. This parameter is mutually exclusive
with ConnectionString.
 
.PARAMETER ViewName
The name of the view whose schema definition should be retrieved.
 
.EXAMPLE
Get-SQLiteViewSchema -DatabaseFilePath "C:\Databases\MyApp.sqlite" `
                    -ViewName "CustomerOrders"
 
#>

function Get-SQLiteViewSchema {

    [CmdletBinding(DefaultParameterSetName = "Default")]
    param (
        ###########################################################################
        [Parameter(
            Position = 0,
            Mandatory = $true,
            ParameterSetName = 'ConnectionString',
            HelpMessage = 'The connection string to the SQLite database.'
        )]
        [string]$ConnectionString,
        ###########################################################################
        [Parameter(
            Position = 0,
            Mandatory = $true,
            ParameterSetName = 'DatabaseFilePath',
            HelpMessage = 'The path to the SQLite database file.'
        )]
        [string]$DatabaseFilePath,
        ###########################################################################
        [Parameter(
            Position = 1,
            Mandatory = $true,
            HelpMessage = 'The name of the view.'
        )]
        [string]$ViewName
    )

    begin {

        # log the start of view schema retrieval
        Write-Verbose "Retrieving schema for view: $ViewName"
    }

    process {

        # construct query to fetch the view definition from sqlite_master table
        $query = "SELECT sql FROM sqlite_master WHERE name = '$ViewName'"

        # log the query being executed
        Write-Verbose "Executing query: $query"

        # add the query to parameters and execute it using Invoke-SQLiteQuery
        $PSBoundParameters["Queries"] = $query
        Invoke-SQLiteQuery @PSBoundParameters
    }

    end {
    }
}
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