安装MySQL过程中测试MySQL是否能够连接后关闭连接

internal/web/actions/default/setup/mysql/mysqlinstallers/mysql_installer.go

@@ -344,10 +344,12 @@ func (this *MySQLInstaller) InstallFromFile(xzFilePath string, targetDir string)
 
 		// waiting for startup
 		for i := 0; i < 30; i++ {
-			_, err = net.Dial("tcp", "127.0.0.1:3306")
+			var conn net.Conn
+			conn, err = net.Dial("tcp", "127.0.0.1:3306")
 			if err != nil {
 				time.Sleep(1 * time.Second)
 			} else {
+				_ = conn.Close()
 				break
 			}
 		}