Question

当我在PG Admin III中执行以下查询时，运行正常：

WITH new_values (updated_at,talker_id,sentence_id,v0,v1,v2,v3,v4,v5) AS (
    VALUES (current_timestamp,'2','3','4','5','6','7','8','9')
),
UPSERT AS (
    UPDATE utel u
    SET
        updated_at=nv.updated_at,
        v0=nv.v0,v1=nv.v1,v2=nv.v2,v3=nv.v3,v4=nv.v4,v5=nv.v5
    FROM
        new_values nv
    WHERE
        u.talker_id=nv.talker_id AND u.sentence_id=nv.sentence_id RETURNING u.*
)
INSERT into utel (updated_at,talker_id,sentence_id,v0,v1,v2,v3,v4,v5)
SELECT updated_at,talker_id,sentence_id,v0,v1,v2,v3,v4,v5
FROM new_values WHERE NOT EXISTS(
    SELECT 1 FROM upsert up
    WHERE
        up.talker_id=new_values.talker_id
        AND up.sentence_id=new_values.sentence_id
)

但是当我尝试通过TFDQuery执行它时，PostgreSQL抱怨道：

字符355处“INSERT”处或附近的语法错误

我打开PostgreSQL日志记录到Windows错误日志并看到以下内容：

DECLARE "10STM" CURSOR WITH HOLD FOR
WITH new_values (updated_at,talker_id,sentence_id,v0,v1,v2,v3,v4,v5) AS (
    VALUES (current_timestamp,'2','3','4','5','6','7','8','9')
),
UPSERT AS (
    UPDATE utel u
    SET
        updated_at=nv.updated_at,
        v0=nv.v0,v1=nv.v1,v2=nv.v2,v3=nv.v3,v4=nv.v4,v5=nv.v5
    FROM
        new_values nv
    WHERE
        u.talker_id=nv.talker_id AND u.sentence_id=nv.sentence_id RETURNING u.*
)
INSERT into utel (updated_at,talker_id,sentence_id,v0,v1,v2,v3,v4,v5)
SELECT updated_at,talker_id,sentence_id,v0,v1,v2,v3,v4,v5
FROM new_values WHERE NOT EXISTS(
    SELECT 1 FROM upsert up
    WHERE
        up.talker_id=new_values.talker_id
        AND up.sentence_id=new_values.sentence_id
)

当我在PG Admin III中使用DECLARE "10STM" CURSOR WITH HOLD FOR执行相同的操作时，我会得到完全相同的错误。

为什么FireDAC会先用光标查询PG查询以及如何避免这种情况？

Answer 1

维多利亚不想得到她的分数，所以答案是：

获取选项中的游标类型设置为ckAutomatic。我将其更改为ckDefault，现在可以正常使用。

FireDAC在DECLARE CURSOR的查询之前

1 个答案: