Question

我正在尝试在postgresql中运行以下操作：

/v1.25/networks?filters=%7B%22name%22%3A%7B%22MyNetwork%22%3Atrue%7D%7D"

他们都是独立工作的，这是：

FOR realm_id IN (SELECT id from decision_realms WHERE id NOT IN (SELECT realm_id FROM voters WHERE realm_id IS NOT NULL)) 
LOOP
    INSERT INTO voters (voter_user_id, max_weight, actual_weight)
    SELECT contributor_user_id, pps, pps 
    FROM contributors WHERE 
        project_id= (SELECT project_id FROM goals WHERE id=(SELECT goal_id FROM decision_realms WHERE id=realm_id))
END LOOP;

返回一列ids，

 (SELECT id from decision_realms WHERE id NOT IN (SELECT realm_id FROM voters WHERE realm_id IS NOT NULL))

当realm_id被硬编码为值（1）时，

按预期填充选民表。

但是如果我尝试替换值1，并根据select的结果使用变量和循环，则for循环不起作用。它说有语法错误。

这可以在不使用FOR LOOP的情况下完成吗？或者我该怎么写呢？

Answer 1

您没有显示语法错误，但我想问题是您的PL / pgSQL变量与您在查询中使用的列具有相同的名称。

具体来说，循环变量是realm_id，它也是表voters中列的名称。

解决方案是为变量使用不同的名称。

Answer 2

不优雅且未经过测试（可能有错误），但应该是那样

INSERT INTO voters (voter_user_id, max_weight, actual_weight)
SELECT contributor_user_id, pps, pps
from
(
    SELECT contributor_user_id, pps, pps 
    FROM contributors WHERE 
        project_id in (
            (SELECT project_id FROM goals WHERE id in (SELECT goal_id FROM decision_realms 
                WHERE id in (SELECT id from decision_realms WHERE id NOT IN (SELECT realm_id FROM voters WHERE realm_id IS NOT NULL)) 
                ))
)dec_realms

或使用with声明

with dec_realms as
(
        SELECT contributor_user_id, pps, pps 
        FROM contributors WHERE 
            project_id in (
                SELECT project_id FROM goals WHERE id in (SELECT goal_id FROM decision_realms 
                    WHERE id in (SELECT id from decision_realms WHERE id NOT IN (SELECT realm_id FROM voters WHERE realm_id IS NOT NULL)) 
                    ))
)

INSERT INTO voters (voter_user_id, max_weight, actual_weight)
    SELECT contributor_user_id, pps, pps
    from dec_realms;

其他选项是使用控件结构FOR，就像那样

DO
$$
DECLARE
    _id integer;
BEGIN
    FOR _id IN (SELECT id from decision_realms WHERE id NOT IN (SELECT realm_id FROM voters WHERE realm_id IS NOT NULL)) 
    LOOP
        INSERT INTO voters (voter_user_id, max_weight, actual_weight)
        SELECT contributor_user_id, pps, pps 
        FROM contributors WHERE 
            project_id= (SELECT project_id FROM goals WHERE id=(SELECT goal_id FROM decision_realms WHERE id=_id));
    END LOOP;
END
$$

我知道如果我犯了错误，我确实缺乏表格结构。第一个和第二个选项可能更快，因为1次操作而不是单独执行每个插入。

Answer 3

这是有效的。可能它必须是一个脚本而不仅仅是一个声明......或类似的东西。

<?php

class Users extends CI_Model  {

    public function getUsers()  {
        $this->load->database();
        $data = "yes"; //here you can write query to get data from table see query builder in codeigniter
        return $data; //here you have to return data
    }
}

FIx或避免在postgresql中使用FOR循环

3 个答案: