如何在 .NET MySqlCommand 中使用 MySql 用户定义变量? [英] How can I use a MySql User Defined Variable in a .NET MySqlCommand?

问题描述

我只是想执行下面的Mysql语句

I simply want to execute the following Mysql statement

SET @a = 1;SELECT @a;

使用 MySql.Data.MySqlClient

with MySql.Data.MySqlClient

[System.Reflection.Assembly]::LoadWithPartialName("MySql.Data")

$password = 'mypassword'

$sql = "SET @a = 1;SELECT @a;"

$server = 'localhost'
$port = 3306
$database = 'test'
$User = 'root'


$conn=new-object MySql.Data.MySqlClient.MySqlConnection
$connectionstring =  "Server=$Server;Port=$port;Database=$DataBase;Uid=$User;Pwd=$Password;allow zero datetime=yes"
$conn.ConnectionString = $connectionstring 
$conn.Open() 

$cmd=new-object MySql.Data.MySqlClient.MySqlCommand($sql,$conn)
$ds=New-Object system.Data.DataSet
$da=New-Object MySql.Data.MySqlClient.MySqlDataAdapter($cmd)
$da.fill($ds) 
$conn.close()
$ds.tables[0]

我收到一个致命错误.

当我用任一替换 $sql 时

When I replace $sql by either

$sql = "SELECT DATABASE();"

或

$sql = "SELECT 1;"

我得到了预期的结果.

我发现了这个 问题，但它不能解决我的问题.

I found this question, but it doesn't solve my problem.

我正在尝试将 SQLIse(SQLPSX 项目的一部分)移植到 MySQL 版本的 MySQLIse.

I'm trying to port SQLIse (a part of the SQLPSX project ) to the MySQL version MySQLIse.

我想处理任何简单有效的 mysql 语句.

I want to process any simple valid mysql statements.

我试图运行 sakila-schema.sql mysql 演示数据库安装脚本，由类似

I was trying to run parts of the sakila-schema.sql the mysql demo database install script which runs by something like

mysql> 源C:/temp/sakila-db/sakila-schema.sql;

mysql> SOURCE C:/temp/sakila-db/sakila-schema.sql;

推荐答案

我在这个博客

我必须补充

;Allow User Variables=True

到连接字符串:

$connectionstring = "Server=$Server;Port=$port;Database=$DataBase;Uid=$User;Pwd=$Password;allow zero datetime=yes;Allow User Variables=True"

有效.我用 6.3.6.0 版对其进行了测试.MySql.Data.

works. I tested it with version 6.3.6.0. of MySql.Data.

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