ProductivityTools.PSSQLCommands.psm1

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function Test-SQLDatabase()
{
    [cmdletbinding()]
    param (
    [Parameter(Mandatory=$true)]
    [string]$SqlInstance, 
    
    [Parameter(Mandatory=$true)]
    [string]$DatabaseName)

    $query="IF EXISTS (SELECT name FROM master.sys.databases WHERE name = N'$DatabaseName')
            BEGIN
                SELECT 1
            END
            else
            begin
                select 0
            end"

    
    $r=Invoke-SQLQuery -SqlInstance $SqlInstance -Query $query 
    if ($r[0] -eq 1)
    {
        return $true
    }
    else {
        return $false
    }
}

function Drop-SQLDatabase()
{
    [cmdletbinding()]
    param (
    [Parameter(Mandatory=$true)]
    [string]$SqlInstance,
    
    [Parameter(Mandatory=$true)]
    [string]$DatabaseName)

    Write-Verbose "Drop-Database command invoked"

    $test=Test-SQLDatabase -SqlInstance $SqlInstance -DatabaseName $DatabaseName  

    if ($test)
    {
        $query= "EXEC msdb.dbo.sp_delete_database_backuphistory @database_name = N'$DatabaseName'"
        Invoke-SQLQuery -Query $query -SqlInstance $SqlInstance
        $query= "ALTER DATABASE [$DatabaseName] SET SINGLE_USER WITH ROLLBACK IMMEDIATE
                 DROP DATABASE $DatabaseName"

        Invoke-SQLQuery -Query $query -SqlInstance $SqlInstance
    }
    else
    {
        Write-Verbose "Database $DatabaseName on the Instance $SqlInstance not exists"
    }

    Write-Verbose "Drop-Database command finished"
}

function CreateDatabase()
{
    [cmdletbinding()]
    param([string]$SqlInstance,[string]$DatabaseName,[string]$Path)
    
    if ($Path -eq "")
    {
        $query= "CREATE DATABASE $DatabaseName"
    }
    else
    {
        $logName=$DatabaseName+"_log"

        $query= "CREATE DATABASE $DatabaseName
                 CONTAINMENT = NONE
                 ON PRIMARY
                ( NAME = N'$DatabaseName', FILENAME = N'$Path\$DatabaseName.mdf' , SIZE = 5120KB , MAXSIZE = UNLIMITED, FILEGROWTH = 1024KB )
                 LOG ON
                ( NAME = N'$logName', FILENAME = N'$Path\$logName.ldf' , SIZE = 1792KB , MAXSIZE = 2048GB , FILEGROWTH = 10%)
                GO"

    }
    
    Invoke-SQLQuery -SqlInstance $SqlInstance -Query $query 
}

function New-SQLDatabase()
{
    [cmdletbinding()]
    param(
    [Parameter(Mandatory=$true)]
    [string]$SqlInstance,
    
    [Parameter(Mandatory=$true)]
    [string]$DatabaseName,
    
    [Parameter(Mandatory=$false)]
    [string]$Path,
    
    [switch]$Force)

    Write-Verbose "New-Database command invoked"

    if ($Force -eq $true)
    {
        Drop-SQLDatabase -SqlInstance $SqlInstance -DatabaseName $DatabaseName
    }
    
    $test=Test-SQLDatabase -SqlInstance $SqlInstance -DatabaseName $DatabaseName  
    if ($test)
    {
        Write-Verbose "Database $DatabaseName on the Instance $SqlInstance exists"
    }
    else
    {
        CreateDatabase -SqlInstance $SqlInstance -DatabaseName $DatabaseName -Path $Path
    }
    Write-Verbose "New-Database command finished"
}

function Test-SQLTable()
{
    [cmdletbinding()]
    param (
    [Parameter(Mandatory=$true)]
    [string]$SqlInstance, 
    
    [Parameter(Mandatory=$true)]
    [string]$DatabaseName, 
    
    [Parameter(Mandatory=$true)]
    [string]$TableName,
    
    [string]$SchemaName="dbo")

    $query="IF (EXISTS (SELECT TOP 1 * FROM INFORMATION_SCHEMA.TABLES
                WHERE TABLE_SCHEMA = '$SchemaName' AND TABLE_NAME = '$TableName'))
            BEGIN
                SELECT 1
            END
            else
            begin
                select 0
            end"

    
    $r=Invoke-SQLQuery -SqlInstance $SqlInstance -DatabaseName $DatabaseName -Query $query 
    if ($r[0] -eq 1)
    {
        return $true
    }
    else {
        return $false
    }
}

function Drop-SQLTable()
{
    [cmdletbinding()]
    param (
    [Parameter(Mandatory=$true)]
    [string]$SqlInstance, 
    
    [Parameter(Mandatory=$true)]
    [string]$DatabaseName, 
    
    [Parameter(Mandatory=$true)]
    [string]$TableName,
    
    [string]$SchemaName="dbo")

    Write-Verbose "Drop-SQLTable command invoked"

    $test=Test-SQLTable -SqlInstance $SqlInstance -DatabaseName $DatabaseName -SchemaName $SchemaName -TableName $TableName

    if ($test)
    {
        $query="DROP TABLE [$SchemaName].[$TableName]"
        Invoke-SQLQuery -SqlInstance $SqlInstance -DatabaseName $DatabaseName -Query $query 
    }
    else {
        Write-Verbose "Table $TableName with schema $SchemaName in the Database $DatabaseName on the Instance $SqlInstance not exists"
    }
    Write-Verbose "Drop-SQLTable command finished"
}

function New-SQLTable()
{
    [cmdletbinding()]
    param (
    [Parameter(Mandatory=$true)]
    [string]$SqlInstance, 
    
    [Parameter(Mandatory=$true)]
    [string]$DatabaseName, 
    
    [Parameter(Mandatory=$true)]
    [string]$TableName,
    
    [string]$SchemaName="dbo", 
    
    [switch]$Force)
    Write-Verbose "New-SQLTable command invoked"

    if ($Force -eq $true)
    {
        Drop-SQLTable -SqlInstance $SqlInstance -DatabaseName $DatabaseName -SchemaName $SchemaName -TableName $TableName
    }
    
    New-SqlSchema -SqlInstance $SqlInstance -DatabaseName $DatabaseName -SchemaName $SchemaName

    $id=$TableName+"Id"
    $query="CREATE TABLE [$SchemaName].[$TableName]($id INT IDENTITY(1,1) PRIMARY KEY)"
    Invoke-SQLQuery -SqlInstance $SqlInstance -DatabaseName $DatabaseName -Query $query 
    Write-Verbose "New-SQLTable command finished"
}

function Test-SQLColumn()
{
    [cmdletbinding()]
    param (
    [Parameter(Mandatory=$true)]
    [string]$SqlInstance, 
    
    [Parameter(Mandatory=$true)]
    [string]$DatabaseName, 
    
    [Parameter(Mandatory=$true)]
    [string]$TableName, 
    
    [Parameter(Mandatory=$true)]
    [string]$ColumnName, 
    
    [Parameter(Mandatory=$true)]
    [string]$Type,
    
    [string]$SchemaName="dbo")

    $query="IF EXISTS(SELECT TOP 1 * FROM INFORMATION_SCHEMA.COLUMNS
            WHERE [TABLE_NAME] = '$TableName'
            AND [COLUMN_NAME] = '$ColumnName'
            AND [TABLE_SCHEMA] = '$SchemaName')
            BEGIN
                SELECT 1
            END
            else
            begin
                select 0
            end"

    
    $r=Invoke-SQLQuery -SqlInstance $SqlInstance -DatabaseName $DatabaseName -Query $query 
    if ($r[0] -eq 1)
    {
        return $true
    }
    else {
        return $false
    }
}

function Drop-SQLColumn()
{
    [cmdletbinding()]
    param (
    [Parameter(Mandatory=$true)]
    [string]$SqlInstance, 
    
    [Parameter(Mandatory=$true)]
    [string]$DatabaseName, 
    
    [Parameter(Mandatory=$true)]
    [string]$TableName, 
    
    [Parameter(Mandatory=$true)]
    [string]$ColumnName, 
    
    [string]$SchemaName="dbo"
    )

    Write-Verbose "Drop-Column command invoked"

    $test=Test-SQLColumn -SqlInstance $SqlInstance -DatabaseName $DatabaseName -SchemaName $SchemaName -TableName $TableName -Name $ColumnName

    if ($test)
    {
        $query="ALTER TABLE [$SchemaName].[$TableName] DROP COLUMN $ColumnName"
        Invoke-SQLQuery -SqlInstance $SqlInstance -DatabaseName $DatabaseName -Query $query 
    }
    else {
        Write-Verbose "Column $ColumnName in Table $TableName with schema $SchemaName in the Database $DatabaseName on the Instance $SqlInstance not exists"
    }
    Write-Verbose "Drop-Column command finished"
}

function New-SqlColumn()
{
    [cmdletbinding()]
    param (
    [Parameter(Mandatory=$true)]
    [string]$SqlInstance, 
    
    [Parameter(Mandatory=$true)]
    [string]$DatabaseName, 
    
    [Parameter(Mandatory=$true)]
    [string]$TableName, 
    
    [Parameter(Mandatory=$true)]
    [string]$ColumnName, 
    [Parameter(Mandatory=$true)]
    [string]$Type,
    
    [string]$SchemaName="dbo",
    
    [switch]$Force)
    
    if ($Force -eq $true)
    {
        Drop-SQLColumn -SqlInstance $SqlInstance -DatabaseName $DatabaseName -SchemaName $SchemaName -TableName $TableName -ColumnName $ColumnName
    }
    
    $query="ALTER TABLE [$SchemaName].[$TableName] ADD [$ColumnName] $Type"
    Invoke-SQLQuery -SqlInstance $SqlInstance -DatabaseName $DatabaseName -Query $query 
}

function Test-SqlSchema()
{
    [cmdletbinding()]
    param (
    [Parameter(Mandatory=$true)]
    [string]$SqlInstance, 
    
    [Parameter(Mandatory=$true)]
    [string]$DatabaseName, 
    
    [Parameter(Mandatory=$true)]
    [string]$SchemaName)

    $query="IF EXISTS (SELECT TOP 1 * FROM sys.schemas WHERE name = '$SchemaName')
            BEGIN
                SELECT 1
            END
            else
            begin
                select 0
            end"

    
    $r=Invoke-SQLQuery -SqlInstance $SqlInstance -DatabaseName $DatabaseName -Query $query 
    if ($r[0] -eq 1)
    {
        return $true
    }
    else {
        return $false
    }
}

function Drop-SqlSchema()
{
    [cmdletbinding()]
    param (
    [Parameter(Mandatory=$true)]
    [string]$SqlInstance, 
    
    [Parameter(Mandatory=$true)]
    [string]$DatabaseName, 
    
    [Parameter(Mandatory=$true)]
    [string]$SchemaName)

    Write-Verbose "Drop-SqlSchema command invoked"

    $test=Test-SqlSchema -SqlInstance $SqlInstance -DatabaseName $DatabaseName -SchemaName $SchemaName  

    if ($test)
    {
        $query="DROP SCHEMA $SchemaName"
        Invoke-SQLQuery -SqlInstance $SqlInstance -DatabaseName $DatabaseName -Query $query 
    }
    else {
        Write-Verbose "Schema $SchemaName in table $TableName in the Database $DatabaseName on the Instance $SqlInstance not exists"
    }
    Write-Verbose "Drop-SqlSchema command finished"
}

function New-SqlSchema()
{
    [cmdletbinding()]
    param (
    [Parameter(Mandatory=$true)]
    [string]$SqlInstance, 
    
    [Parameter(Mandatory=$true)]
    [string]$DatabaseName, 
    
    [string]$SchemaName="dbo")
    
    $test=Test-SqlSchema -SqlInstance $SqlInstance -DatabaseName $DatabaseName -SchemaName $SchemaName  
    if ($test)
    {
        Write-Verbose "Schema $SchemaName on the SqlInstance $SqlInstance in the DatabaseName $DatabaseName exists"
    }
    else 
    {
        $query="CREATE SCHEMA $SchemaName"
        Invoke-SQLQuery -SqlInstance $SqlInstance -DatabaseName $DatabaseName -Query $query 
    }
}

function Invoke-SQLQuery()
{
    [cmdletbinding()]
    param (
    [Parameter(Mandatory=$true)]
    [string]$SqlInstance,
    
    [Parameter(Mandatory=$false)]
    [string]$DatabaseName,
    
    [Parameter(Mandatory=$true)]
    [string]$Query)
    

    Write-Verbose -Message "On the $SqlInstance Instance in the $DatabaseName Database following query executed:"
    Write-Verbose -Message "$query"

    if ($DatabaseName -eq $null -or $DatabaseName -eq "")
    {
        $r = return Invoke-Sqlcmd -ServerInstance $SqlInstance -Query $query
        return $r
    }
    else
    {
        $r = (Invoke-Sqlcmd -ServerInstance $SqlInstance -Database $DatabaseName -Query $query)
        return $r;
    }
}

function Ivoke-SQLScripts()
{
    [cmdletbinding()]
    param (
    [Parameter(Mandatory=$true)]
    [string]$SqlInstance,
    
    [Parameter(Mandatory=$true)]
    [string]$DatabaseName,
    
    [Parameter(Mandatory=$true)]
    [string]$Directory)
    
    $path="$directory\*.sql"
    $sqlFiles=Get-ChildItem -Path $path
    
    foreach($sql in $sqlFiles)
    {
        Invoke-Sqlcmd -ServerInstance $SqlInstance -Database $DatabaseName -InputFile $sql    
    }
}

 Export-Modulemember Test-SQLDatabase
 Export-Modulemember Drop-SQLDatabase 
 Export-Modulemember New-SQLDatabase
 Export-Modulemember Test-SQLTable
 Export-Modulemember Drop-SQLTable
 Export-Modulemember New-SQLTable
 Export-Modulemember Test-SQLColumn
 Export-Modulemember Drop-SQLColumn
 Export-Modulemember New-SqlColumn
 Export-Modulemember Test-SqlSchema
 Export-Modulemember Drop-SqlSchema
 Export-Modulemember New-SqlSchema
 Export-Modulemember Invoke-SQLQuery
 Export-Modulemember Ivoke-SQLScripts