Question

我有这个代码，当我搜索特定内容时，它可以正常工作。如果我只知道Order_ID的一部分，我怎么能改变它以便它可以工作。我尝试了一切，我想我只是没有以正确的方式做到这一点。

SqlConnection con = new SqlConnection(@"Data Source=ANNA\MSSQLSERVER2012;Initial Catalog=Wine house;Integrated Security=True;");
con.Open();

string strSQL1 = "";
if (textBox1.Text.Length > 0)
{
    if (strSQL1.Length > 0)
    {
        strSQL1 = strSQL1 + " AND ";
    }
    strSQL1 = strSQL1 + "Order_ID=" + textBox1.Text;

}

if (textBox2.Text.Length > 0)
{
    if (strSQL1.Length > 0)
    {
        strSQL1 = strSQL1 + " AND ";
    }
    strSQL1 = strSQL1 + "Client_ID=" + textBox2.Text;
}

if (textBox3.Text.Length > 0)
{
    if (strSQL1.Length > 0)
    {
        strSQL1 = strSQL1 + " AND ";
    }
    strSQL1 = strSQL1 + "Amount_due=" + textBox3.Text;
}

if (textBox4.Text.Length > 0)
{
    if (strSQL1.Length > 0)
    {
        strSQL1 = strSQL1 + " AND ";
    }
    strSQL1 = strSQL1 + "Employee_ID=" + textBox4.Text;
}

if (textBox5.Text.Length > 0)
{
    if (strSQL1.Length > 0)
    {
        strSQL1 = strSQL1 + " AND ";
    }
    strSQL1 = strSQL1 + "DeliveryDate='" + textBox5.Text;
}

if (textBox6.Text.Length > 0)
{
    if (strSQL1.Length > 0)
    {
        strSQL1 = strSQL1 + " AND ";
    }
    strSQL1 = strSQL1 + "Delivered='" + textBox6.Text + "'";
}

if (strSQL1.Length > 0)
{
    strSQL1 = @"SELECT Order_ID, Client_ID, Amount_due, Employee_ID, CONVERT(nvarchar, DeliveryDate, 104) AS DeliveryDate, Delivered FROM Orders WHERE" + strSQL1;
}
else
{
    strSQL1 = @"SELECT Order_ID, Client_ID, Amount_due, Employee_ID, CONVERT(nvarchar, DeliveryDate, 104) AS DeliveryDate, Delivered FROM Orders";
}

SqlCommand cmd = new SqlCommand(strSQL1, con);
SqlDataAdapter da = new SqlDataAdapter(cmd);
DataTable table = new DataTable();
da.Fill(table);
dataGridView1.DataSource = new BindingSource(table, null);
con.Close();

Answer 1

您可以使用 like 运算符，请参阅：

http://www.w3schools.com/sql/sql_like.asp

类似的东西：

WHERE Order_ID LIKE '%THE_ID_FRACTION_YOU_HAVE%'

“％”是一个通配符，即使您知道的部分不是ID的开头或结尾，也可以搜索。

Answer 2

使用您的示例，您可以执行以下操作：

strSQL1 = strSQL1 + "Order_ID LIKE '%" + textBox1.Text + "%'";

查找可能包含部分搜索

2 个答案: