Postgresql Postgre SQL在If附近的语法不正确

我试图创建函数，但它在If语句中出错，我不知道它有什么问题

CREATE FUNCTION uspgetcountrylistwithpagenumber(IN "PageNumber" integer, IN "PageSize"         integer, IN "WhereClause" text, IN "OrderBy" text) RETURNS SETOF getcountrylistitem AS
$BODY$declare 
RowData "getcountrylistitem"%rowtype;

    IF $1 <> -1 and $2 <> -1  then
        for RowData in
        loop
            execute 'Select "CountryId","CountryName"' ||
                    'from "MasterCountry"' ||
                    $3 || 
                    $4 ||
                    'limit' || $2 ||
                    'offset' || ($1-1)*$2           
            RETURN NEXT RowData;
        END LOOP;
        RETURN;     
    else
        for RowData in
        loop
            execute 'Select "CountryId","CountryName"' ||
                    'from "MasterCountry"' ||
                    'order by "CountryName" asc'
            RETURN NEXT RowData;
            END LOOP;
            RETURN;
    end IF;
end;
$BODY$
LANGUAGE plpgsql IMMUTABLE;
ALTER FUNCTION public.uspgetcountrylistwithpagenumber(IN integer, IN integer, IN text, IN text)
OWNER TO postgres;

以上是有助于解决问题的参数值

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如果需要更多信息，请告诉我。提前感谢您：P

您需要在第一个

IF

之前使用

开始

标记函数体的开始，我没有看到

开始

。

PageNumber=1
PageSize=10
WhereClause=Where 1=1 and CountryName='INDIA'
OrderByClause=order by CountryName desc