Question

我正在制作发票计划，我需要在我的数据库中准备2个表，我在两个表中建立了一个名为Invoice_No的关系联盟，我打电话给两个并从Invoice_No调用我的发票数据但是当我执行所有工作时好，在输入数据后和我按下时打印按钮它给我一个错误不明确的列名Invoice_No，给我一个解决方案

 Cursor = Cursors.WaitCursor;
            frmSalesinvoice frm = new frmSalesinvoice();
            invoice rpt = new invoice();
            //The report you created.
            SqlConnection myConnection = default(SqlConnection);
            SqlCommand MyCommand = new SqlCommand();
            SqlDataAdapter myDA = new SqlDataAdapter();
            DS_Invoice_all myDS = new DS_Invoice_all();
            myConnection = new SqlConnection(cs);
            MyCommand.Connection = myConnection;
            MyCommand.CommandText = "select * from Invoice_Info,Items_Soled where Items_Soled.Invoice_No=Invoice_Info.Invoice_No and Invoice_No= '" + textBoxInvoiceNo.Text + "'";
            MyCommand.CommandType = CommandType.Text;
            myDA.SelectCommand = MyCommand;
            myDA.Fill(myDS, "Invoice_Info");
            myDA.Fill(myDS, "Items_Soled");
            rpt.SetDataSource(myDS);
            frm.crystalReportViewer1.ReportSource = rpt;
            frm.Show();

Answer 1

您需要更改SQL查询，以便没有任何重复的列名。您可以为列添加别名，以便获得唯一的名称。

例如，如果两列都有一个名为ID的字段，则应使它们唯一。

select 

info.Id As info_id,
soled.Id As soled_id,
--rest of your columns here with the table prefix

from Invoice_Info info
inner join Items_Soled soled
on soled.Invoice_No=info.Invoice_No
where info.Invoice_No= '

此外，您应该尝试避免using Old Style joins他们可以使查询更难以阅读..

Answer 2

当您在一个语句中连接两个或多个表时会发生此错误，并且这些表中的列之间具有相同的名称，并且在引用语句中的列时未使用表名为列名添加前缀。

Items_Sold.Invoice_No=Invoice_Info.Invoice_No

Answer 3

您需要在此处使用表名，因为两个表中都存在该列。 Sql Server对你指的是哪一列感到困惑：）

select * 
from Invoice_Info,Items_Soled 
where Items_Soled.Invoice_No=Invoice_Info.Invoice_No 
and [TableName].Invoice_No = ????

<强> JOIN
实现相同结果的更好方法是使用JOIN和ON子句，类似这样

select * 
from Invoice_Info INNER JOIN Items_Soled 
ON Items_Soled.Invoice_No=Invoice_Info.Invoice_No 
WHERE [TableName].Invoice_No = ????

修改

Cursor = Cursors.WaitCursor; frmSalesinvoice frm = new frmSalesinvoice(); invoice rpt = new invoice(); //The report you created. SqlConnection myConnection = default(SqlConnection); SqlCommand MyCommand = new SqlCommand(); SqlDataAdapter myDA = new SqlDataAdapter(); DS_Invoice_all myDS = new DS_Invoice_all(); myConnection = new SqlConnection(cs); MyCommand.Connection = myConnection; MyCommand.CommandText = "select * from Invoice_Info INNER JOIN Items_Soled ON Items_Soled.Invoice_No=Invoice_Info.Invoice_No WHERE [TableName].Invoice_No = '" + textBoxInvoiceNo.Text + "'"; MyCommand.CommandType = CommandType.Text; myDA.SelectCommand = MyCommand; myDA.Fill(myDS, "Invoice_Info"); myDA.Fill(myDS, "Items_Soled"); rpt.SetDataSource(myDS); frm.crystalReportViewer1.ReportSource = rpt; frm.Show();

Crystal报告模糊列名称错误。

3 个答案: