小编Pro*_*991的帖子

我已经声明了2个字符串变量：

string fname;
string lname;

当我在phpMyAdmin数据库中编写MySQL查询时：

SELECT workers.FNAME, workers.LNAME FROM project1.workers INNER JOIN
project1.order_status ON workers.ID_WORKER = order_status.ID_WORKER 
INNER JOIN project1.orders ON orders.ID_ORDER = order_status.ID_ORDER 
WHERE orders.ORDER_NUMBER = 'TEST' GROUP BY workers.FNAME, workers.LNAME

我有2个炒锅：

-“亚当·加克斯”和

“安德鲁·沃尔姆”

然后，我想从该查询存储对象，并将该数据加载到datagridview：

    string query1 = string.Format("SELECT workers.FNAME, workers.LNAME FROM project1.workers INNER JOIN project1.order_status " +
    "ON workers.ID_WORKER = order_status.ID_WORKER INNER JOIN project1.orders ON orders.ID_ORDER = order_status.ID_ORDER " +
    "WHERE orders.ORDER_NUMBER = '"+ NrOrder +"' GROUP BY workers.FNAME, workers.LNAME");

    SQLdata.connection.Open();
    using (var command = new MySqlCommand(query1, …

在这种情况下，我将数据从大文件（大约37 MB）导入到datagridview中。Excel文件中的表在下面：

从Excel将数据加载到datagridview后，我将该数据插入MySQL数据库：

foreach (DataGridViewRow row in datagrdStatus_order.Rows)
{
    string constring = "datasource = localhost; port = 3306; username = root; password = ";
    using (MySqlConnection con = new MySqlConnection(constring))
    {
        using (MySqlCommand cmd = new MySqlCommand("INSERT IGNORE INTO try1.order_status(ID_WORKER, ID_ORDER, ID_MODULE, ID_PROJECT, AMOUNT_OF_PRODUCTS, BEGIN_DATE, END_DATE) SELECT workers.ID_WORKER, orders.ID_ORDER, module.ID_MODULE, projects.ID, @AMOUNT_OF_PRODUCTS, @BEGIN_DATE, @END_DATE FROM try1.workers INNER JOIN try1.orders INNER JOIN try1.modules INNER JOIN try1.projects WHERE workers.FNAME = @FNAME AND workers.LNAME = @LNAME AND workers.ID_WORKER = @ID_WORKER AND orders.DESC_ORDER = …

我试图在井号＃前面添加一个空格。但是，如果井号前面已经有空格，则不应添加空格。另外，它不应在字符串的首字符添加空格。这是我到目前为止的内容：

string result = Regex.Replace("542#452", @"(?=#)(?!$)", " ");

但这会增加双倍的空格（当一个磅符号已经有一个空格时）。它还在开头添加了一个空格：

样本数据和所需的输出：

Input        Output
243#423      243 #423
22 #44       22 #44
#32#         #32 #
#            #
##           # #

谢谢