Question

我们的软件存在问题，为了解决问题，我必须编写一个存储过程，该过程将作为升级安装升级过程的一部分运行。此存储过程需要查找特定表中与特定条件匹配的每一行并更新该行。出于内部原因，更新必须通过我们专门为插入和更新数据而编写的存储过程来完成。

以下是我为解决此问题而编写的存储过程：

CREATE OR REPLACE FUNCTION FixDataProblem() RETURNS VOID AS $$
DECLARE
    FixCursor   NO SCROLL CURSOR FOR
        SELECT * FROM MyTable WHERE ProblemColumn IN ( '?', 'PR' );
    RowToUpdate         MyTable%ROWTYPE;
BEGIN
    -- Open the cursor
    OPEN FixCursor;

    -- Start a loop
    LOOP
        -- Fetch the next row from thr cursor
        FETCH FixCursor INTO RowToUpdate;

        -- Did we get anything back?
        IF RowToUpdate IS NULL THEN
            -- We didn't. Exit the loop
            EXIT;
        END IF;

        -- Call the UpsertMyTable stored procedure to set the ProblemColumn column to NULL
        SELECT CarSystem.UpsertMyTable( RowToUpdate.RowId,
                               RowToUpdate.ForeignId,
                               RowToUpdate.CountryId,
                               NULL,
                               RowToUpdate.Plate,
                               RowToUpdate.HashedData,
                               RowToUpdate.PlateClassId,
                               RowToUpdate.AlarmClassId,
                               RowToUpdate.BeginDate,
                               RowToUpdate.EndDate,
                               RowToUpdate.ListPriorityId,
                               RowToUpdate.VehicleTypeId,
                               RowToUpdate.MakeId,
                               RowToUpdate.ModelId,
                               RowToUpdate.Year,
                               RowToUpdate.ColorId,
                               RowToUpdate.Notes,
                               RowToUpdate.OfficerNotes,
                               NULL,
                               UUID_GENERATE_V4() );
    END LOOP;

    -- Close the cursor
    CLOSE ListDetailsCursor;
END;
$$ LANGUAGE plpgsql;

这个存储过程很好，但是当我运行它时，我得到：

ERROR:  query has no destination for result data
HINT:  If you want to discard the results of a SELECT, use PERFORM instead.
CONTEXT:  PL/pgSQL function "fixdataproblem" line 22 at SQL statement


********** Error **********

ERROR: query has no destination for result data
SQL state: 42601
Hint: If you want to discard the results of a SELECT, use PERFORM instead.
Context: PL/pgSQL function "fixdataproblem" line 22 at SQL statement

如何解决此问题？我相信我正在调用存储过程。我真的不知道这个存储过程的问题是什么。

由于

贝

Answer 1

它就在那里说：

ERROR:  query has no destination for result data
HINT:  If you want to discard the results of a SELECT, use PERFORM instead.
CONTEXT:  PL/pgSQL function "fixdataproblem" line 22 at SQL statement

在第22行：

    -- Call the UpsertMyTable stored procedure to set the ProblemColumn column to NULL
    SELECT CarSystem.UpsertMyTable( RowToUpdate.RowId,
    ...

将其从SELECT更改为PERFORM。有关原因，请参阅PERFORM。

如何修复此PostgreSQL 9.1存储过程？

1 个答案: