基于多个下拉选择的sql语句

Question

我需要创建一个可以根据选择的选项进行调整的 SQL 语句。我有 2 个从数据库中填充的下拉列表。

这是我的 ASP

<td class="theSearchTableData">
                    <asp:UpdatePanel runat="server" ID="up_team" UpdateMode="Conditional">
                        <ContentTemplate>
                            <asp:DropDownList runat="server" ID="ddl_team"></asp:DropDownList><%--AutoPostBack="true" OnSelectedIndexChanged="ddl_team_SelectedIndexChanged"--%>
                        </ContentTemplate>
                    </asp:UpdatePanel>

                </td>
                <td class="theSearchTableData">
                    <asp:DropDownList runat="server" ID="ddl_owner"></asp:DropDownList>
                </td>
                  <td class="theSearchTableData">
                    <asp:DropDownList runat="server" ID="ddl_actionowner" ></asp:DropDownList>
                </td>

c#代码

string Owner_ActionOwner_Combo = "";
string ownerClause = "";
string ActionownerClause = "";

    if (ddl_owner.SelectedIndex > 0)
    {
        ownerClause = " log_number in (SELECT DISTINCT log_number FROM Log_Data WHERE log_owner = @logOwner) AND ";
    }

    if (ddl_actionowner.SelectedIndex > 0)
    {
        ActionownerClause = " log_number in (SELECT DISTINCT log_number FROM Log_Data WHERE log_owner <> @actionOwner and current_action_owner = @actionOwner  ) AND ";
    }

    else if (ddl_actionowner.SelectedIndex >0 & ddl_owner.SelectedIndex > 0 )
    {
        Owner_ActionOwner_Combo = "log_number in (SELECT DISTINCT log_number FROM Log_Data WHERE current_action_owner = @actionOwner and log_owner =@logOwner) AND";
    }
string completeWhereClause = ActionownerClause + Owner_ActionOwner_Combo + ownerClause;

“@”值已被参数化。

log_owner 通常是 action_owner，但是有一段时间 log​​_owner 与 action_owner 不同。这就是为什么我需要调整搜索条件。 如果用户想知道他们按日志所有者搜索的日志所有者，并且与操作所有者相同。问题是当他们同时搜索时。

我已将其输入我的数据库并获得了正确的数字。 log_owner 有 32 个，如果只有 action_owner 有 3 个，组合应该有 24 个。

感谢您的宝贵时间

Answer 1

你的 if 语句结构转化为这个..

if (ddl_owner.SelectedIndex > 0)
{   Hit if ddl_owner.SelectedIndex > 0       }
if (ddl_actionowner.SelectedIndex > 0)
{   Hit if ddl_actionowner.SelectedIndex > 0       }
else if (ddl_actionowner.SelectedIndex > 0 & ddl_owner.SelectedIndex > 0)
{   Never hit        }

你可能应该把你的组合 if 移到顶部，然后将 else if 用于其他两个

string Owner_ActionOwner_Combo = "";
string ownerClause = "";
string ActionownerClause = "";

if (ddl_actionowner.SelectedIndex > 0 && ddl_owner.SelectedIndex > 0)
{
    Owner_ActionOwner_Combo = "log_number in (SELECT DISTINCT log_number FROM Log_Data WHERE current_action_owner = @actionOwner and log_owner =@logOwner) AND";
}
else if (ddl_owner.SelectedIndex > 0)
{
    ownerClause = " log_number in (SELECT DISTINCT log_number FROM Log_Data WHERE log_owner = @logOwner) AND ";
}
else if (ddl_actionowner.SelectedIndex > 0)
{
    ActionownerClause = " log_number in (SELECT DISTINCT log_number FROM Log_Data WHERE current_action_owner = @actionOwner  ) AND ";
}
string completeWhereClause = ActionownerClause + Owner_ActionOwner_Combo + ownerClause;