标签: plpgsql

我有一个程序：

create or replace procedure pro_update_last_read(in input_sensor_id integer, in read_time timestamp)
as
$$
begin
    update sensor
    set last_read = read_time
    where sensor_id = input_sensor_id;
end;
$$ language plpgsql;

以及一个调用它的触发器：

create trigger tri_last_read
    after insert or update of report_time
    on report
execute procedure pro_update_last_read(sensor_id, report_time);

但是，在创建触发器时，我收到错误消息：

 [42883] ERROR: function pro_update_last_read() does not exist

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为什么会发生这个错误？

我正在尝试返回重叠多边形的数量。问题是它抱怨我的“$1”标志：

Error is "SQL state: 42601", syntax error at "$1". 

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为什么是这样？我在这里完全是初学者，除了用符号引用参数之外，我无法在网上找到解决方案$。

CREATE OR REPLACE FUNCTION any_overlap (x text) 
RETURNS integer AS $$
DECLARE amount INTEGER;
BEGIN
    SELECT COUNT(*) INTO amount FROM $1 a
    INNER JOIN $1 b ON 
    (a.polygon && b.polygon AND ST_Relate(a.polygon, b.polygon, '2********'))
    WHERE a.ctid != b.ctid;
    RETURN amount AS id;
END; $$ LANGUAGE plpgsql;

我想更改架构中所有对象的所有者。为此，我使用以下函数：

CREATE OR REPLACE FUNCTION chown(in_schema VARCHAR, new_owner VARCHAR) 
RETURNS void AS
$$
DECLARE
  object_types VARCHAR[];
  object_classes VARCHAR[];
  object_type record;

  r record;
BEGIN
  object_types = '{type,table,sequence,index,table,view}';
  object_classes = '{c,t,S,i,r,v}';

  FOR object_type IN 
      SELECT unnest(object_types) type_name, 
                unnest(object_classes) code
  loop
    FOR r IN 
      EXECUTE '
          select n.nspname, c.relname 
          from pg_class c, pg_namespace n 
          where n.oid = c.relnamespace 
            and nspname = ''' || in_schema || '''
            and relkind = ''' || object_type.code || ''''
    loop 
      raise notice 'Changing ownership of % %.% to …

我想使用COPYPostgres 中的函数将数据发送到 .csv 文件。但我使用匿名块，所以我的表名应该是变量的值。

COPY (SELECT cname.portal from user) To '/tmp/out.csv' With CSV;

cname我的匿名块内的变量在哪里。我尝试使用EXECUTE格式，但它也不起作用。我试过类似的东西：

EXECUTE format ('    COPY (select * from %s.portal,cname ) To '/tmp/out1.csv' With CSV');