Question

我试图将数据插入temp_table，然后在分析结果后截断表。

这是我的代码：

CREATE OR REPLACE FUNCTION validation()
  RETURNS text AS $$
DECLARE counter INTEGER;
DECLARE minsid INTEGER;
DECLARE maxsid INTEGER;
DECLARE rec RECORD;
DECLARE stmt varchar;
BEGIN
  SELECT MIN(sid) INTO minsid FROM staging.validation;
  SELECT MAX(sid) INTO maxsid FROM staging.validation;

  CREATE TEMPORARY TABLE temp_table (col1 TEXT, col2 INTEGER, col3 BOOLEAN) ON COMMIT DROP;

  FOR counter IN minsid..maxsid LOOP
    RAISE NOTICE 'Counter: %', counter;
    SELECT sql INTO stmt FROM staging.validation WHERE sid = counter;

    RAISE NOTICE 'sql: %', stmt;

    PERFORM 'INSERT INTO temp_table (col1, col2, col3) ' || stmt;

    IF temp_table.col3 = false THEN
      RAISE NOTICE 'there is a false value';
    END IF;

  END LOOP;
END; $$
LANGUAGE plpgsql;

每当我运行此功能 SELECT * FROM validation(); 我收到一个错误：

ERROR: missing FROM-clause entry for table "temp_table" Where: PL/pgSQL function validation() line 21 at IF

以下是我的staging.validation表的外观 -

https://docs.google.com/spreadsheets/d/1bXO9gqFS-GtcC1qJtgNbFkR6ygOuPtR_RZoU7VNhgrI/edit?usp=sharing

Answer 1

首先，您不必为每个变量使用DECLARE，只需使用一个。

DECLARE
    counter INTEGER;
    minsid INTEGER;
    maxsid INTEGER;
    rec RECORD;
    stmt varchar;

其次，你不能像那样使用temp_table.col3，你必须查询它，因为它是一个表。您可以在表中创建变量和查询，也可以直接进行查询。

变量：

-- First you declare de varialbe:
DECLARE
    temp BOOLEAN;

... -- rest of your code

temp := temp_table.col3 FROM temp_table WHERE temp_table.col2=counter;
-- you need something to make the query, here as a test I put col2=counter
IF temp=false THEN
... -- rest of your code

直接：

... -- rest of your code
IF (SELECT temp_table.col3 FROM temp_table WHERE temp_table.col2=counter)=false THEN
-- Again, you need something to make the query
... -- rest of your code

第三，你的函数有 RETURNS text ，在你的pl中缺少回报;

使用PERFORM将一个SELECT语句字符串插入临时表

1 个答案: