无法在Groovy中连接SQL server

@Grab('com.microsoft.sqlserver:mssql-jdbc:9.4.0.jre8')
import groovy.sql.Sql

def url = 'jdbc:sqlserver://localhost:1433;databaseName=mydatabase'
def username = 'myusername'
def password = 'mypassword'

def sql = Sql.newInstance(url, username, password, 'com.microsoft.sqlserver.jdbc.SQLServerDriver')

// 执行SQL查询
def result = sql.rows('SELECT * FROM mytable')

// 处理查询结果
result.each { row ->
    println "ID: ${row.id}, Name: ${row.name}"
}

// 关闭数据库连接
sql.close()