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sql-server - 如果某些参数未传递给过程，则参数化存储过程会绕过左连接

问题描述

我已经向我的存储过程添加了一个左连接，但是即使我没有传递连接所需的参数，我的查询现在也需要 4 到 10 倍的时间才能运行。

这是我的存储过程：

USE [Test]
GO
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
ALTER PROCEDURE [dbo].[OrderLoadAllPaged]
    @OrderId int = 0,
    @WarehouseId int = 0,
    @PaymentMethodSystemName nvarchar(max) = null,
    @OrderStatusId int = 0,
    @PaymentStatusId int = 0,
    @ShippingStatusId int = 0,
    @BillingEmail nvarchar(max) = null,
    @BillingFirstName nvarchar(max) = null,
    @BillingLastName nvarchar(max) = null,
    @ShippingMethod nvarchar(max) = null,
    @CreatedFromUtc datetime = null,
    @CreatedToUtc datetime = null
AS
BEGIN
    DECLARE
        @sql nvarchar(max)

    SET NOCOUNT ON;

    SELECT TOP 100 *
    FROM [Test].[dbo].[Order] o with (NOLOCK)

    LEFT join [Test].[dbo].[Address] a on (a.Id LIKE o.BillingAddressId)
    WHERE (@BillingEmail IS null OR a.[Email] = @BillingEmail)
    AND (@BillingFirstName IS null OR a.[FirstName] = @BillingFirstName)
    AND (@BillingLastName IS null OR a.[LastName] = @BillingLastName)

    AND
        o.[Deleted] = 0

    AND (o.[Id] = @OrderId OR @OrderId = 0)
    AND (o.[WarehouseId] = @WarehouseId OR @WarehouseId = 0)

    AND (@PaymentMethodSystemName IS null OR o.[PaymentMethodSystemName] = @PaymentMethodSystemName)

    AND (o.[OrderStatusId] = @OrderStatusId OR @OrderStatusId = 0)
    AND (o.[PaymentStatusId] = @PaymentStatusId OR @PaymentStatusId = 0)
    AND (o.[ShippingStatusId] = @ShippingStatusId OR @ShippingStatusId = 0)

    AND (@ShippingMethod IS null OR o.[ShippingMethod] = @ShippingMethod)
    AND o.[CreatedOnUtc] >= ISNULL(@CreatedFromUtc, '1/1/1900')
    AND o.[CreatedOnUtc] < ISNULL(@CreatedToUtc, '1/1/2999')

    ORDER BY o.[CreatedOnUtc] DESC
END

因此，如果我不传入@BillingEmail，@BillingFirstName或者@BillingLastName就像仍然考虑左连接一样：

如果我注释掉左连接，我的查询真的很快：

/*LEFT join [Test].[dbo].[Address] a on (a.Id LIKE o.BillingAddressId)
    WHERE (@BillingEmail IS null OR a.[Email] = @BillingEmail)
    AND (@BillingFirstName IS null OR a.[FirstName] = @BillingFirstName)
    AND (@BillingLastName IS null OR a.[LastName] = @BillingLastName)*/
    WHERE --need to change
        o.[Deleted] = 0

如果或全部为空@BillingEmail，我如何才能一起绕过该查询。@BillingFirstName@BillingLastName

我想可能是这样的，但这是不对的：

case
    when (ISNULL(@BillingEmail) OR ISNULL(@BillingFirstName) OR ISNULL(@BillingLastName))
    then 
        WHERE
            o.[Deleted] = 0
    ELSE
        LEFT join [Test].[dbo].[Address] a on (a.Id LIKE o.BillingAddressId)
        WHERE (@BillingEmail IS null OR a.[Email] = @BillingEmail) --LIKE '%' + @BillingEmail + '%'
        AND (@BillingFirstName IS null OR a.[FirstName] = @BillingFirstName)
        AND (@BillingLastName IS null OR a.[LastName] = @BillingLastName)
        AND
            o.[Deleted] = 0
end

我查看了索引，但我认为我不能为这 3 个参数创建索引。有什么想法可以绕过左连接吗？

标签： sql-servertsqlstored-proceduresconditional-statementsleft-join

解决方案

让我们尝试将您的left join表格移动到经过过滤的subquery.

left join 
    (select * from [Test].[dbo].[Address] a 
        where (@BillingEmail IS null OR a.[Email] = @BillingEmail)
        AND (@BillingFirstName IS null OR a.[FirstName] = @BillingFirstName)
        AND (@BillingLastName IS null OR a.[LastName] = @BillingLastName)) t1
        ON t1.Id = o.BillingAddressId

要根据您的条件绕过左连接，您可以使用以下代码。

if (ISNULL(@BillingEmail, '') = '' and ISNULL(@BillingFirstName, '') = '' and ISNULL(@BillingLastName, '') = '')
    begin
        SELECT TOP 100 *
        FROM [Test].[dbo].[Order] o with (NOLOCK)
        WHERE o.[Deleted] = 0
        AND (o.[Id] = @OrderId OR @OrderId = 0)
        AND (o.[WarehouseId] = @WarehouseId OR @WarehouseId = 0)
        AND (@PaymentMethodSystemName IS null OR o.[PaymentMethodSystemName] = @PaymentMethodSystemName)
        AND (o.[OrderStatusId] = @OrderStatusId OR @OrderStatusId = 0)
        AND (o.[PaymentStatusId] = @PaymentStatusId OR @PaymentStatusId = 0)
        AND (o.[ShippingStatusId] = @ShippingStatusId OR @ShippingStatusId = 0)
        AND (@ShippingMethod IS null OR o.[ShippingMethod] = @ShippingMethod)
        AND o.[CreatedOnUtc] >= ISNULL(@CreatedFromUtc, '1/1/1900')
        AND o.[CreatedOnUtc] < ISNULL(@CreatedToUtc, '1/1/2999')
        ORDER BY o.[CreatedOnUtc] DESC
    end
else
    begin   
        SELECT TOP 100 *
        FROM [Test].[dbo].[Order] o with (NOLOCK)
         left join 
            (select * from [Test].[dbo].[Address] a 
                where (@BillingEmail IS null OR a.[Email] = @BillingEmail)
                AND (@BillingFirstName IS null OR a.[FirstName] = @BillingFirstName)
                AND (@BillingLastName IS null OR a.[LastName] = @BillingLastName)) t1
                ON t1.Id = o.BillingAddressId
        WHERE o.[Deleted] = 0
        AND (o.[Id] = @OrderId OR @OrderId = 0)
        AND (o.[WarehouseId] = @WarehouseId OR @WarehouseId = 0)
        AND (@PaymentMethodSystemName IS null OR o.[PaymentMethodSystemName] = @PaymentMethodSystemName)
        AND (o.[OrderStatusId] = @OrderStatusId OR @OrderStatusId = 0)
        AND (o.[PaymentStatusId] = @PaymentStatusId OR @PaymentStatusId = 0)
        AND (o.[ShippingStatusId] = @ShippingStatusId OR @ShippingStatusId = 0)

        AND (@ShippingMethod IS null OR o.[ShippingMethod] = @ShippingMethod)
        AND o.[CreatedOnUtc] >= ISNULL(@CreatedFromUtc, '1/1/1900')
        AND o.[CreatedOnUtc] < ISNULL(@CreatedToUtc, '1/1/2999')

        ORDER BY o.[CreatedOnUtc] DESC
    end

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