我不明白为什么将查询结果存储在变量中如此困难。
当我运行此脚本而不尝试将结果存储在变量中时,我得到了正确的结果。但是,如果我尝试将相同的值存储在变量中,则该变量的值是 System.Data.DataRow。我尝试将其转换为字符串(这会导致脚本崩溃)、$data_set.Tables[0].Rows[0]
和 $data_set.Tables[0].Rows[ 0]["Value"]
但仍然没有运气。打印结果是不够的,我需要根据查询结果进行更改。
我想要$max_slide_count = 910980
$slide_id_query = "SELECT MAX(SLIDE_ID) FROM INFOTECHSLIDES.SLIDES;"
try {
Write-Host "Creating Database Connection"
#ENABLE MYSQL DRIVER
[System.Reflection.Assembly]::LoadWithPartialName("MySql.Data")
#CREATE MYSQL CONNECTION
$connection = New-Object MySql.Data.MySqlClient.MySqlConnection
$connection.ConnectionString = $connection_string
#OPEN DB CONNECTION
Write-Host "Opening Database Connection"
$connection.Open()
#RUN MYSQL QUERY
$command = New-Object MySql.Data.MySqlClient.MySqlCommand($slide_id_query, $connection)
$data_adapter = New-Object MySql.Data.MySqlClient.MySqlDataAdapter($command)
$data_set = New-Object System.Data.DataSet
$record_count = $data_adapter.Fill($data_set, "data")
#STORE RESULT
$max_slide_count = $data_set.Tables[0]
$data_set.Tables[0] #RETURNS: MAX(SLIDE_ID) : 910980
Write-Host "Result: $max_slide_count" #RETURNS: System.Data.DataRow
} catch {
Write-Host "Could not execute MySql Query" $Error[0]
}
最佳答案
您需要从行中获取该项目。
$max_slide_count = $data_set.Tables[0].Rows[0].Item("MAX(SLIDE_ID)")
关于mysql - 将SQL查询结果存储在变量中,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/42119005/