如何使多个if程序更短和更有效？

分类：编程问答

如何解决如何使多个if程序更短和更有效？

我有这个程序，基本上检查分类帐类型，并在此基础上从相关表中选择数据。

主表（即GLedger）存储来自不同模块的交易，并根据分类账类型ID进行区分。

有什么方法可以使此过程更短，更有效？

实际查询的时间长于此，但我对其进行了修剪以进行发布。

  ALTER PROCEDURE [dbo].[Pro_General_Ledger_Reported2] -- exec Sp_General_Ledger_Reported2 1,NULL,NULL
        @CompanyID INT = NULL,@GLAccountNo VARCHAR(30) = NULL,@GLAccountNoFrom VARCHAR(30) = NULL,@FromDate VARCHAR(30) = '',@ToDate VARCHAR(30) = ''
        --Select * From GLedger
    AS
    BEGIN
        SET @FromDate = CASE 
                WHEN @FromDate = ''
                    THEN '1/1/2000'
                ELSE @FromDate
                END
        SET @ToDate = CASE 
                WHEN @ToDate = ''
                    THEN '1/1/2030'
                ELSE @ToDate
                END
    
        IF (
                @FromDate != NULL
                OR @FromDate != ''
                AND @ToDate != NULL
                OR @ToDate != ''
                )
        BEGIN
            SELECT Com.CompanyCode,G.BusinessArea,'Not Assigned' AS 'ProjectCode',G.GLAccountNo,COA.ShortText,G.DocCurrency,G.DocCurrencyAmount,G.Currency AS 'localCurrecny',G.Amount AS 'LocalAmount',V.Reference AS 'Reference',cast(G.DocumentNumber AS VARCHAR(100)) AS 'DocumentNumber',PVTypes.Type AS 'Document Type',V.PostingDate AS 'PostingDate',V.InvoiceDate AS 'DocmentDate',G.PK,V.ClearingDocumentNo AS 'Clearing Document','' AS 'Assignment','' AS 'Department','' AS 'ServiceLineCode','' AS 'ProjectCode','' AS 'OffSettingAcctNo',V.TEXT AS 'Text'
            FROM GLedger G
            INNER JOIN Company Com ON G.CompanyID = Com.CompanyID
            INNER JOIN Vendorinvoice V ON G.MainID = v.VendorInvoice_ID
                AND G.LedgerType_ID = '1'
            LEFT JOIN PVTypes ON V.Transaction_ID = PVTypes.Id
            LEFT JOIN COA ON G.GLAccountNo = COA.GLAccount
            WHERE (G.CompanyID = @CompanyID)
                AND (
                    G.GLAccountNo BETWEEN @GLAccountNo
                        AND @GLAccountNoFrom
                    )
                AND (
                    (
                        G.GLAccountNo >= @GLAccountNo
                        OR @GLAccountNo IS NULL
                        )
                    AND (
                        G.GLAccountNo <= @GLAccountNoFrom
                        OR @GLAccountNoFrom IS NULL
                        )
                    )
                AND (
                    Convert(DATE,G.DATETIME,101) BETWEEN Convert(DATE,@FromDate,101)
                        AND Convert(DATE,@ToDate,101)
                    )
            
            UNION ALL
            
            SELECT Com.CompanyCode,B.BranchCode,P.ProjectCode AS 'ProjectCode','' AS 'Reference','' AS 'Document Type','' AS 'PostingDate','' AS 'DocmentDate','' AS 'Clearing Document',VI.Assignment AS 'Assignment',D.DepartmentCode AS 'Department',S.Code AS 'ServiceLineCode',VI.TEXT AS 'Text'
            FROM GLedger G
            INNER JOIN Company Com ON G.CompanyID = Com.CompanyID
            INNER JOIN Branch B ON G.BusinessArea = B.BranchCode
            INNER JOIN VendorInvoiceTransactions VI ON G.SubID = VI.VendorTransactionsID
                AND G.LedgerType_ID = '2'
            LEFT JOIN Department D ON G.DepartmentID = D.DepartmentID
            LEFT JOIN ServiceLineMaster S ON G.ServiceLineID = S.ID
            LEFT JOIN Projects P ON VI.Project_ID = p.Project_ID
            LEFT JOIN COA ON G.GLAccountNo = COA.GLAccount
            WHERE (G.CompanyID = @CompanyID)
                AND (
                    (
                        G.GLAccountNo >= @GLAccountNo
                        OR @GLAccountNo IS NULL
                        )
                    AND (
                        G.GLAccountNo <= @GLAccountNoFrom
                        OR @GLAccountNoFrom IS NULL
                        )
                    )
                AND (
                    Convert(DATE,S.InvoiceNo AS 'Reference',S.PODate AS 'PostingDate',S.PODate AS 'DocmentDate',S.AccountingAssignment AS 'Assignment',S.TextDescription AS 'Text'
            FROM GLedger G
            INNER JOIN Company Com ON G.CompanyID = Com.CompanyID
            INNER JOIN Branch B ON G.BusinessArea = B.BranchCode
            --inner join LedgerTypes L on G.LedgerType_ID = L.ID
            INNER JOIN Sales S ON G.MainID = S.SalesID
                AND G.LedgerType_ID = '3'
            LEFT JOIN Projects P ON S.AccAssignmentWBSElementID = p.Project_ID
            LEFT JOIN COA ON G.GLAccountNo = COA.GLAccount
            --inner join Department D on S.AccAssignmentDepartmentID = D.DepartmentID
            --inner join ServiceLineMaster SE on S.AccAssignmentServiceLineID = SE.ServiceLineID
            --inner join Projects P on S.AccAssignmentWBSElementID = P.Project_ID
            WHERE (G.CompanyID = @CompanyID)
                AND (
                    (
                        G.GLAccountNo >= @GLAccountNo
                        OR @GLAccountNo IS NULL
                        )
                    AND (
                        G.GLAccountNo <= @GLAccountNoFrom
                        OR @GLAccountNoFrom IS NULL
                        )
                    )
                AND (
                    Convert(DATE,S.Name AS 'ServiceLineCode','' AS 'Text'
            FROM GLedger G
            INNER JOIN Company Com ON G.CompanyID = Com.CompanyID
            INNER JOIN Branch B ON G.BusinessArea = B.BranchCode
            --inner join LedgerTypes L on G.LedgerType_ID = L.ID
            INNER JOIN SalesTransactions ST ON G.SubID = ST.SalesTransactionID
                AND G.LedgerType_ID = '4'
            LEFT JOIN Department D ON G.DepartmentID = D.DepartmentID
            LEFT JOIN ServiceLineMaster S ON G.ServiceLineID = S.ID
            LEFT JOIN Projects P ON ST.ProjectID = p.Project_ID
            LEFT JOIN COA ON G.GLAccountNo = COA.GLAccount
            WHERE (G.CompanyID = @CompanyID)
                AND (
                    (
                        G.GLAccountNo >= @GLAccountNo
                        OR @GLAccountNo IS NULL
                        )
                    AND (
                        G.GLAccountNo <= @GLAccountNoFrom
                        OR @GLAccountNoFrom IS NULL
                        )
                    )
                AND (
                    Convert(DATE,TAIP.Reference AS 'Reference',TAIP.PostingDate AS 'PostingDate',TAIP.DocumentDate AS 'DocmentDate',TAIP.DocHeaderText AS 'Text'
            FROM GLedger G
            INNER JOIN Company Com ON G.CompanyID = Com.CompanyID
            INNER JOIN tblAccountsInvoicePayable TAIP ON G.MainID = TAIP.PayableInvoice_ID
                AND G.LedgerType_ID = '5'
            INNER JOIN PVTypes ON TAIP.Type = PVTypes.Id
            LEFT JOIN COA ON G.GLAccountNo = COA.GLAccount
            WHERE (G.CompanyID = @CompanyID)
                AND (
                    (
                        G.GLAccountNo >= @GLAccountNo
                        OR @GLAccountNo IS NULL
                        )
                    AND (
                        G.GLAccountNo <= @GLAccountNoFrom
                        OR @GLAccountNoFrom IS NULL
                        )
                    )
                AND (
                    Convert(DATE,RVI.Reference AS 'Reference',RVI.PostingDate AS 'PostingDate',RVI.DocumentDate AS 'DocmentDate',RVI.DocHeaderText AS 'Text'
            FROM GLedger G
            INNER JOIN Company Com ON G.CompanyID = Com.CompanyID
            INNER JOIN ReceviableInvoice RVI ON G.MainID = RVI.ReceviableInvoice_ID
                AND G.LedgerType_ID = '7'
            INNER JOIN PVTypes ON RVI.Type = PVTypes.Id
            LEFT JOIN COA ON G.GLAccountNo = COA.GLAccount
            WHERE (G.CompanyID = @CompanyID)
                AND (
                    (
                        G.GLAccountNo >= @GLAccountNo
                        OR @GLAccountNo IS NULL
                        )
                    AND (
                        G.GLAccountNo <= @GLAccountNoFrom
                        OR @GLAccountNoFrom IS NULL
                        )
                    )
                AND (
                    Convert(DATE,PDHD.Reference AS 'Reference',PDHD.PostingDate AS 'PostingDate',PDHD.DocumentDate AS 'DocmentDate',PDHD.Assignment AS 'Assignment',PDHD.DocHeaderText AS 'Text'
            FROM GLedger G
            INNER JOIN Company Com ON G.CompanyID = Com.CompanyID
            INNER JOIN PostDocumentHeaderData PDHD ON G.MainID = PDHD.VendorPVId
                AND G.LedgerType_ID = '8'
            INNER JOIN PVTypes ON PDHD.TypeID = PVTypes.Id
            LEFT JOIN Department D ON G.DepartmentID = D.DepartmentID
            LEFT JOIN ServiceLineMaster S ON G.ServiceLineID = S.ID
            LEFT JOIN Projects P ON PDHD.Projects = p.Project_ID
            LEFT JOIN COA ON G.GLAccountNo = COA.GLAccount
            WHERE (G.CompanyID = @CompanyID)
                AND (
                    (
                        G.GLAccountNo >= @GLAccountNo
                        OR @GLAccountNo IS NULL
                        )
                    AND (
                        G.GLAccountNo <= @GLAccountNoFrom
                        OR @GLAccountNoFrom IS NULL
                        )
                    )
                AND (
                    Convert(DATE,VPHD.Reference AS 'Reference',VPHD.PostingDate AS 'PostingDate',VPHD.DocumentDate AS 'DocmentDate',VPHD.Assignment AS 'Assignment',VPHD.DocHeaderText AS 'Text'
            FROM GLedger G
            INNER JOIN Company Com ON G.CompanyID = Com.CompanyID
            INNER JOIN VendorPVHeaderData VPHD ON G.MainID = VPHD.VendorPVId
                AND G.LedgerType_ID = '8'
            INNER JOIN PVTypes ON VPHD.TypeID = PVTypes.Id
            LEFT JOIN Department D ON G.DepartmentID = D.DepartmentID
            LEFT JOIN ServiceLineMaster S ON G.ServiceLineID = S.ID
            LEFT JOIN Projects P ON VPHD.Projects = p.Project_ID
            LEFT JOIN COA ON G.GLAccountNo = COA.GLAccount
            WHERE (G.CompanyID = @CompanyID)
                AND (
                    (
                        G.GLAccountNo >= @GLAccountNo
                        OR @GLAccountNo IS NULL
                        )
                    AND (
                        G.GLAccountNo <= @GLAccountNoFrom
                        OR @GLAccountNoFrom IS NULL
                        )
                    )
                AND (
                    Convert(DATE,'' AS 'Offsettingacctno',V.TEXT AS 'Text'
            FROM GLedger G
            INNER JOIN Company Com ON G.CompanyID = Com.CompanyID
            INNER JOIN Branch B ON G.BusinessArea = B.BranchCode
            --inner join LedgerTypes L on G.LedgerType_ID = L.ID
            INNER JOIN Vendorinvoice V ON G.MainID = v.VendorInvoice_ID
                AND G.LedgerType_ID = '9'
            INNER JOIN PVTypes ON V.Transaction_ID = PVTypes.Id
            LEFT JOIN COA ON G.GLAccountNo = COA.GLAccount
            WHERE (G.CompanyID = @CompanyID)
                AND (
                    (
                        G.GLAccountNo >= @GLAccountNo
                        OR @GLAccountNo IS NULL
                        )
                    AND (
                        G.GLAccountNo <= @GLAccountNoFrom
                        OR @GLAccountNoFrom IS NULL
                        )
                    )
                AND (
                    Convert(DATE,S.TextDescription AS 'Text'
            FROM GLedger G
            INNER JOIN Company Com ON G.CompanyID = Com.CompanyID
            INNER JOIN Branch B ON G.BusinessArea = B.BranchCode
            --inner join LedgerTypes L on G.LedgerType_ID = L.ID
            INNER JOIN Sales S ON G.MainID = S.SalesID
                AND G.LedgerType_ID = '9'
            LEFT JOIN Projects P ON S.AccAssignmentWBSElementID = p.Project_ID
            LEFT JOIN COA ON G.GLAccountNo = COA.GLAccount
            WHERE (G.CompanyID = @CompanyID)
                AND (
                    (
                        G.GLAccountNo >= @GLAccountNo
                        OR @GLAccountNo IS NULL
                        )
                    AND (
                        G.GLAccountNo <= @GLAccountNoFrom
                        OR @GLAccountNoFrom IS NULL
                        )
                    )
                AND (
                    Convert(DATE,V.TEXT AS 'Text'
            FROM GLedger G
            INNER JOIN Company Com ON G.CompanyID = Com.CompanyID
            INNER JOIN Vendorinvoice V ON G.MainID = v.VendorInvoice_ID
                AND G.LedgerType_ID = '10'
            LEFT JOIN PVTypes ON V.Transaction_ID = PVTypes.Id
            LEFT JOIN COA ON G.GLAccountNo = COA.GLAccount
            WHERE (G.CompanyID = @CompanyID)
                AND (
                    G.GLAccountNo BETWEEN @GLAccountNo
                        AND @GLAccountNoFrom
                    )
                AND (
                    (
                        G.GLAccountNo >= @GLAccountNo
                        OR @GLAccountNo IS NULL
                        )
                    AND (
                        G.GLAccountNo <= @GLAccountNoFrom
                        OR @GLAccountNoFrom IS NULL
                        )
                    )
                AND (
                    Convert(DATE,101)
                    )
        END

    END
        --Select * from Projects

解决方法

如我所见，所有的select语句都从GLedger和公司表开始，并在同一时间段进行过滤。

您可以首先在临时表中插入所有过滤后的数据，然后在该临时表而不是整个表上运行所有查询。 根据您的数据（我的公司也有一个会计应用程序），如果正确地索引表，它也会更快。

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