Question

我正在编写此查询以检查重复项，但无法获得多个工作。＆＃34;，＆＃34;附近的语法错误就是我得到的。

private static bool duplicate(Dictionary<TableKey, string> entry)
    {
        SqlConnection connection = new SqlConnection(ConfigurationManager.ConnectionStrings["DefaultConnection"].ConnectionString);
        // TODO: Make changes to this command when new additions/modifications to the DB structure occur  
        string commandText = @"Select Barcode, FullName, Location, Notes, Category From Inventory " +
                             @"Where Barcode = @barcode, FullName = @fullname, Location = @location, " +
                             @"Notes = @notes, Category = @category";

        SqlCommand command = new SqlCommand(commandText, connection);

        command.Parameters.AddWithValue("@barcode", entry[TableKey.Barcode]);
        command.Parameters.AddWithValue("@fullname", entry[TableKey.FullName]);
        command.Parameters.AddWithValue("@location", entry[TableKey.Location]);
        command.Parameters.AddWithValue("@notes", entry[TableKey.Notes]);
        command.Parameters.AddWithValue("@category", entry[TableKey.Category]);

        command.Connection.Open();
        SqlDataReader reader = command.ExecuteReader();

        if (reader.HasRows)
            return true;
        else
            return false;
    }

这是我的问题：

@"Where Barcode = @barcode, FullName = @fullname, Location = @location, " +
                             @"Notes = @notes, Category = @category";

我怎么会有多个人？我已经尝试了＆＃34;和＆＃34;和＆＃34; AND＆＃34;

Answer 1

这应该可以正常工作。

@"Where Barcode = @barcode AND FullName = @fullname AND Location = @location AND " +
      @"Notes = @notes AND Category = @category";

查找重复项

SELECT COUNT(*) as cnt, * 
From Inventory
GROUP  BY Barcode, FullName, Location, Notes, Category
HAVING COUNT(*) > 1

Answer 2

你应该使用

和

或

OR

条件

下面的

是使用AND

的示例

"Where Barcode = @barcode AND FullName = @fullname AND Location = @location AND " +
                             @"Notes = @notes AND Category = @category";

多个where子句SQL Server

2 个答案: