Question

我有一个TextBox和一个搜索按钮。用户将多个逗号分隔值放在一个TextBox（例如111,222,333）中，这些值存储在一列（ID）中，然后通过MS Access表获取网格视图中的所有记录。

表名：mytable

字段：

ID  name    phno
111 saket   8097626799
222 deepak  9167480458
333 abhi    9229457891
444 rajesh  9826789561
555 sudhir  9167849503

输出：

ID  name    phno
111 saket   8097626799
222 deepak  9167480458
333 abhi    9229457891

Answer 1

以下对文本框中的文本进行断言，请参阅注释。如果所有断言/验证都通过，变量whereCondition将包含示例SQL语句。

private void button1_Click(object sender, EventArgs e)
{
    string whereStatement = "";
    // ensure we have something to work with
    if (!string.IsNullOrWhiteSpace(textBox1.Text))
    {
        // Are there commas
        if (textBox1.Text.Contains(","))
        {
            string textValue = textBox1.Text.TrimEnd();
            // make sure there is no trailing commas
            if (textValue.Last() != ',')
            {
                string[] parts = textBox1.Text.Split(',');
                int badCount = 0;
                int testValue = 0;
                // see if all values are int
                foreach (string item in parts)
                {
                    if (!int.TryParse(item, out testValue))
                    {
                        badCount += 1;
                    }
                }

                if (badCount == 0)
                {
                    string whereCondition = "ID = " + textValue.Replace(",", " OR ID = ");
                    whereStatement = string.Format("SELECT [Name], phno WHERE {0} FROM mytable", whereCondition);
                }
            }
        }
        else
        {
            // one id 
            whereStatement = string.Format("SELECT [Name], phno WHERE ID = {0} FROM mytable", textBox1.Text);
        }
    }

    if (!string.IsNullOrWhiteSpace(whereStatement))
    {
        MessageBox.Show(whereStatement);
    }
    else
    {
        MessageBox.Show("Invald data");
    }
}

Answer 2

我有另一个代码它的工作原理 c＃CODE

protected void Page_Load（object sender，EventArgs e） { if（！this.IsPostBack） { this.BindGrid（）; } } protected void搜索（对象发送者，EventArgs e） { this.BindGrid（）; }

private void BindGrid()
{
    //string constr = ConfigurationManager.ConnectionStrings["constr"].ConnectionString;
    string constr = @"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=D:\WebSite1\App_Data\MPHS.mdb";

    using (OleDbConnection con = new OleDbConnection(constr))
    {
        using (OleDbCommand cmd = new OleDbCommand())
        {
            cmd.Connection = con;
            string resultCont = string.Empty;
            if (!string.IsNullOrEmpty(txtSearch.Text))
            {
                string[] contactNames = txtSearch.Text.Trim().Split(',');
                foreach (string cont in contactNames)
                {
                    if (!string.IsNullOrEmpty(cont))
                    {
                        resultCont = resultCont + ",'" + cont + "'";
                    }
                }
                resultCont = resultCont.Remove(0, 1);
                cmd.CommandText = "SELECT * FROM myTable WHERE Docnum IN (" + resultCont + ")";
            }
            else
            {
                cmd.CommandText = "SELECT * FROM myTable";
            }
            DataTable dt = new DataTable();
            using (OleDbDataAdapter sda = new OleDbDataAdapter(cmd))
            {
                sda.Fill(dt);
                gvCustomers.DataSource = dt;
                gvCustomers.DataBind();
            }
        }
    }
}

在单个TextBox中以逗号分隔值从Access表中选择记录

2 个答案: