尝试运行plpgsql函数时出现语法错误42601

Question

我是PL/pgSQL的新手。在尝试向表中插入数据时，以下函数会产生错误。这link定义了错误，但我无法理解此链接问题。

CREATE OR REPLACE FUNCTION updateScore() 
RETURNS void AS 
$$ 
DECLARE 
singleTopicCriteriaPercentage DECIMAL(6,6); 
sitePercentage    DECIMAL(6,6); 
singleSiteCriteriaPercentage DECIMAL(6,6); 
totalSocre     DECIMAL(6,6); 

cursor1 CURSOR FOR select id from sitereviews order by id; 
cursor2 CURSOR FOR select weight into rating from sitereviews_ratingcriteria where site_id = id; 

id    sitereviews.id%TYPE; 
weights   sitereviews_ratingcriteria.weight%TYPE; 

BEGIN 
singleTopicCriteriaPercentage := (10.0/120.0) * 100.0; 
sitePercentage := 0.0; 
singleSiteCriteriaPercentage := 0.0; 
totalSocre := 0.0; 

OPEN cursor1; 
LOOP 
FETCH cursor1 INTO id; 
EXIT WHEN NOT FOUND; 
totalSocre := 0.0; 

OPEN cursor2; 
LOOP 
FETCH cursor2 INTO weights; 
EXIT WHEN NOT FOUND; 
    sitePercentage := singleTopicCriteriaPercentage * weights; 
    singleSiteCriteriaPercentage := (sitePercentage/100) * 10; 
    totalSocre := singleSiteCriteriaPercentage + totalSocre; 
END LOOP; 
CLOSE cursor2; 

update sitereviews set weights := round(totalSocre) WHERE CURRENT OF cursor1; 
END LOOP 
CLOSE cursor1; 
END; 
$$ LANGUAGE 'PLPGSQL' 

以下是编译时错误：

ERROR: syntax error at or near "$1" 
LINE 1: update sitereviews set $1 := round($2) WHERE CURRENT OF ... 
          ^
QUERY: update sitereviews set $1 := round($2) WHERE CURRENT OF $3 
CONTEXT: SQL statement in PL/PgSQL function "updatescore" near line 35 

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

ERROR: syntax error at or near "$1" 
SQL state: 42601 
Context: SQL statement in PL/PgSQL function "updatescore" near line 35 

Answer 1

更改您的UPDATE语句

update sitereviews set set weights = round(totalSocre) WHERE CURRENT OF cursor1 

，或者基本上去掉 “：” 等号之前。 PL/SQL和plpgsql使用:=进行赋值和比较，但SQL使用=。

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