Postgres的DBLINK逃避單引號

Question

相關鏈接：

• String literals and escape characters in postgresql

這是我的錯誤：

ERROR: type "e" does not exist 

這裏是我的查詢：

SELECT * 
FROM dblink('host=theHostName port=1234 dbname=theDBName user=theUser password=thePassword', 
    E'SELECT field_1, 
    CASE WHEN field_2 IS NOT NULL 
    THEN \'inactive\' ELSE \'active\' 
    END AS field_status 
    FROM the_table 
    ') 
AS linkresults(field_1 varchar(20),field_2 varchar(8)) 

如果我ü SE雙引號，刪除反斜槓逃逸的單引號和SELECT語句之前刪除對E

SELECT * 
FROM dblink('host=theHostName port=1234 dbname=theDBName user=theUser password=thePassword', 
    "SELECT field_1, 
    CASE WHEN field_2 IS NOT NULL 
    THEN 'inactive' ELSE 'active' 
    END AS field_status 
    FROM the_table 
    ") 
AS linkresults(field_1 varchar(20),field_2 varchar(8)) 

我得到這個：

NOTICE: identifier "SELECT ..." will be truncated 

而且我也得到了錯誤我的查詢截斷。

我以前曾經用dblink轉義過，所以有服務器設置或我需要配置的東西嗎？

我知道查詢工作得很好，如果我在sql server本身上運行它，但沒有與dblink運行。有什麼想法嗎？

的Postgres 8.4版

Answer 1

嘗試用 '' 無效 '' 替換\ '無效\' - 注意：兩個單引號

SELECT * 
    FROM dblink('host=theHostName port=1234 dbname=theDBName user=theUser password=thePassword', 
     'SELECT field_1, 
     CASE WHEN field_2 IS NOT NULL 
     THEN ''inactive'' ELSE ''active'' 
     END AS field_status 
     FROM the_table 
     ') 

AS linkresults(field_1 varchar(20),field_2 varchar(8)) 

替代（以前的）解決方案

SELECT * 
    FROM dblink('host=theHostName port=1234 dbname=theDBName user=theUser password=thePassword', 
     'SELECT field_1, 
     CASE WHEN field_2 IS NOT NULL 
     THEN E\'inactive\' ELSE E\'active\' 
     END AS field_status 
     FROM the_table 
     ') 

AS linkresults(field_1 varchar(20),field_2 varchar(8)) 

Answer 2

試試這個查詢：

SELECT * 
FROM dblink('host=theHostName port=1234 dbname=theDBName user=theUser password=thePassword', 
'SELECT field_1, 
CASE WHEN field_2 IS NOT NULL 
THEN $$inactive$$ ELSE $$active$$ 
END AS field_status 
FROM the_table') 
AS linkresults(field_1 varchar(20),field_2 varchar(8))