Question

为了好玩并教育自己，我正在为Powershell编写自己的SQL Server查询包装器。请参阅下面我目前所处的位置。

我现在的主要问题是，如果您使用错误的username，password或servername调用该函数，则PS需要大约一分钟才能返回大量错误。我想返回更多有用的错误消息，即

登录失败;用户存在但密码错误
登录失败;用户不存在
找不到服务器
等。

在当前函数的位置和方法中，我可以实现用于捕获和解析PS错误到有用消息的部分吗？

Function Query {
    <#
    .SYNOPSIS 
        Query a SQL Server instance
    .EXAMPLE
        Query -query "SELECT column FROM table"
        This command returns a dataset from the SQL server.
    .DESCRIPTION
        This function returns different output based on the query type. DROP, 
        ALTER and DELETE statements are not allowed for security reasons.
    .LINK
        http://spark/publish-later
    #>

    param (
        [string]$query,
        [string]$server = "SQLEXPRESS",
        [string]$dbase  = "TEST",
        [string]$user,
        [string]$pass
    )

    if ($user) { 
        $connstr = "Server={0};Database={1};User ID={2};Password={3};Trusted_Connection=False;Connect Timeout=15" -f $server, $dbase, $user, $pass 
    } 
    else { # Windows Authentication is implied
        $connstr = "Server={0};Database={1};Integrated Security=True;Connect Timeout=15" -f $server, $dbase
    }

    $conn  = New-Object System.Data.SqlClient.SqlConnection($connstr)

    try {
        $conn.Open()
        switch ($query.Split()[0]) {
            "SELECT" {
                $cmd = New-Object System.Data.SqlClient.SqlCommand($query,$conn)
                $adapter = New-Object System.Data.SqlClient.SqlDataAdapter($cmd)
                $dataset = New-Object System.Data.DataSet
                $adapter.Fill($dataset) | Out-Null
                return $dataset.Tables[0]
            }
            "UPDATE" {
                $cmd = New-Object System.Data.SqlClient.SqlCommand($query,$conn)
                return $cmd.ExecuteNonQuery()
            }
            "INSERT" {
                $cmd = New-Object System.Data.SqlClient.SqlCommand($query,$conn)
                return $cmd.ExecuteNonQuery()
            }
        }
        $conn.Close()
    }
    catch {
        $ex = $_.Exception
        return "$ex.Message"
        continue
    }
}

SQL Server包装器中的错误处理

0 个答案: