c# - 按姓名、地址、联系电话等搜索客户

Question

我在根据姓名、地址、联系电话、付款金额等输入的值搜索客户时陷入了困境。

如果我仅输入名称，则所有匹配 %name% 的客户应显示在下面。 如果我输入姓名和地址，则应显示符合该条件的客户。

我有搜索字段

1) 姓名

2) 联系电话

3) 身份类型(ddl，带有 PAN CARD、VOTING CARD、PASSPORT 等选项)

4) 身份证号码

5) 地址

6) 金额标准(ddl，选项为等于、小于、大于、介于)

7)支付金额(等于、小于、大于的情况)

8) 最低金额(如果介于两者之间)

9) 最大金额(介于之间的情况)

我尝试过

using (SqlCommand cmd = new SqlCommand("sp_search_customer", con))
            {
                cmd.CommandType = CommandType.StoredProcedure;

                if (txtCustomerName.Text != "" && txtContactNumber.Text != "" && cbIDProofType.Text != "" && txtIDNumber.Text != "" && txtAddress.Text != "" && txtAmountPaid.Text == "")
                {
                    cmd.Parameters.Add(new SqlParameter("@customer_name", SqlDbType.NVarChar)).Value = name;
                    cmd.Parameters.Add(new SqlParameter("@customer_address", SqlDbType.NVarChar)).Value = address;
                    cmd.Parameters.Add(new SqlParameter("@customer_contact_number", SqlDbType.Int)).Value = contact_number;
                    cmd.Parameters.Add(new SqlParameter("@customer_id_proof_type", SqlDbType.NVarChar)).Value = id_proof_type;
                    cmd.Parameters.Add(new SqlParameter("@customer_id", SqlDbType.NVarChar)).Value = id_number;
                    cmd.Parameters.Add(new SqlParameter("@amount_paid", SqlDbType.Int)).Value = 0;
                    cmd.Parameters.Add(new SqlParameter("@min_amount", SqlDbType.Int)).Value = min_amount;
                    cmd.Parameters.Add(new SqlParameter("@max_amount", SqlDbType.Int)).Value = max_amount;
                }
                else if (txtCustomerName.Text != "" && txtContactNumber.Text != "" && cbIDProofType.Text != "" && txtIDNumber.Text != "" && txtAddress.Text != "" && txtMinAmount.Text != "" && txtMaxAmount.Text != "")
                {
                    cmd.Parameters.Add(new SqlParameter("@customer_name", SqlDbType.NVarChar)).Value = name;
                    cmd.Parameters.Add(new SqlParameter("@customer_address", SqlDbType.NVarChar)).Value = address;
                    cmd.Parameters.Add(new SqlParameter("@customer_contact_number", SqlDbType.Int)).Value = contact_number;
                    cmd.Parameters.Add(new SqlParameter("@customer_id_proof_type", SqlDbType.NVarChar)).Value = id_proof_type;
                    cmd.Parameters.Add(new SqlParameter("@customer_id", SqlDbType.NVarChar)).Value = id_number;
                    cmd.Parameters.Add(new SqlParameter("@amount_paid", SqlDbType.Int)).Value = amount_paid;
                    cmd.Parameters.Add(new SqlParameter("@min_amount", SqlDbType.Int)).Value = 0;
                    cmd.Parameters.Add(new SqlParameter("@max_amount", SqlDbType.Int)).Value = 0;
                }

                cmd.ExecuteNonQuery();
                SqlDataAdapter da = new SqlDataAdapter(cmd);
                da.Fill(DatTab);
            }

            this.customerBindingSource1.DataSource = DatTab;
            this.reportViewer1.RefreshReport();

我的存储过程是

ALTER PROCEDURE [dbo].[sp_search_customer]

@customer_name nvarchar(100),
@customer_address nvarchar(500),
@customer_contact_number nvarchar(50),
@customer_id_proof_type nvarchar(50),
@customer_id nvarchar(50),
@amount_paid int,
@min_amount_paid int,
@max_amount_paid int

as
begin
    select customer_number, customer_name, customer_address, customer_contact_number, customer_id_proof_type, customer_id, customer_vehicle_type, customer_vehicle_number, customer_room_number, customer_no_of_days_stay, customer_cost, check_in_date, number_of_adults, number_of_children
from Customer
where Customer.customer_name LIKE ''+'%'+@customer_name+'%'+''
    and Customer.customer_address LIKE ''+'%'+@customer_address+'%'+''
    AND Customer.customer_contact_number = @customer_contact_number
    AND Customer.customer_id_proof_type = @customer_id_proof_type
    AND Customer.customer_id = @customer_id
    AND Customer.customer_cost = @amount_paid
    AND Customer.customer_cost BETWEEN @min_amount_paid and @max_amount_paid
end

但结果并不如预期。 如果我在每种情况下都使用 AND，那么它不会显示任何记录。 如果我在每种情况下都使用 OR，那么它会显示所有记录。 你能告诉我怎么做吗？？？

我是否必须在代码中的 if...else 中使用这些字段的所有可能组合？？？ 或者有什么办法可以轻松完成这个任务吗？

Answer 1

对于未给出的值，您应该传递 NULL:

if (String.IsNullOrEmpty(name))
{ 
  cmd.Parameters.Add(new SqlParameter("@customer_name", SqlDbType.NVarChar)).Value = DBNull.Value;
}
else
{ 
  cmd.Parameters.Add(new SqlParameter("@customer_name", SqlDbType.NVarChar)).Value = name;
}

然后在存储过程中检查 NULL:

where (Customer.customer_name LIKE ''+'%'+@customer_name+'%'+'' or @customer_name is null)
and (Customer.customer_address LIKE ''+'%'+@customer_address+'%'+'' or @customer_address is null)
...