Question

我正在尝试将我们的mapserver上mapfile中的查询功能重新创建为plpgsql存储过程。

以下是查询：

geom from (select g.gid, g.geom, g.basin, a.\"DATE\", a.\"VALUE\" from sarffg_basins_00_regional_3sec as g join \"%prod_table%\" as a on g.basin = a.\"BASIN\" where a.\"DATE\" = '%prod_date%') as subquery using unique gid using srid=4326

在我的存储过程中，我有：

RETURN QUERY
             EXECUTE 'SELECT geom FROM (
                             SELECT g.gid,
                             g.geom,
                             g.basin,
                             a.date,
                             a.value
                             FROM sarffg_basins_00_regional_3sec AS g
                             JOIN '||tablename_ts||' AS a
                             ON g.basin = a.basin
                             WHERE a.date = '''||adj_timestamp||''')
                             AS subquery USING UNIQUE gid USING srid=4326';

在我的mapfile中找到的上述查询工作正常。当我尝试在psql中调用我的存储过程时，我得到：

ERROR:  syntax error at or near "USING"
LINE 11:     AS subquery USING UNIQUE gid USING srid=4326
                     ^
QUERY:  SELECT geom FROM (
                            SELECT g.gid,
                            g.geom,
                            g.basin,
                            a.date,
                            a.value
                            FROM sarffg_basins_00_regional_3sec AS g
                            JOIN temp_table_ts AS a
                            ON g.basin = a.basin
                            WHERE a.date = '2017-01-15 00:00:00+00')
                            AS subquery USING UNIQUE gid USING srid=4326
CONTEXT:  PL/pgSQL function ingest_ffgs_prod_composite_csv(text,bigint,boolean,boolean) line 239 at RETURN QUERY

我也尝试在我的函数中省略“using”子句，而是在调用存储过程后将该部分保留在mapfile中，即：

DATA "select * from ingest_ffgs_prod_composite_csv('%prod_table%', 1484438400) as subquery using unique gid using srid=4326"

使用包含以下内容的存储过程

RETURN QUERY
             EXECUTE 'SELECT geom FROM (
                             SELECT g.gid,
                             g.geom,
                             g.basin,
                             a.date,
                             a.value
                             FROM sarffg_basins_00_regional_3sec AS g
                             JOIN '||tablename_ts||' AS a
                             ON g.basin = a.basin
                             WHERE a.date = '''||adj_timestamp||''');

但这让我在mapserver错误日志中出现错误：

[Wed Jan 25 02:28:17 2017].593733 msDrawMap(): Image handling error. Failed to draw layer named 'regional_basin_values'.
[Wed Jan 25 02:28:17 2017].659656 msPostGISLayerWhichShapes(): Query error. Error executing query: ERROR:  syntax error at or near "select"
LINE 1: ..._BASIN_TIMESERIES', 1484438400) as subquery where select * &...
                                                         ^

[Wed Jan 25 02:28:17 2017].659862 msDrawMap(): Image handling error. Failed to draw layer named 'regional_basin_product'.
[Wed Jan 25 02:28:22 2017].836950 msPostGISLayerWhichShapes(): Query error. Error executing query: ERROR:  syntax error at or near "select"
LINE 1: ..._BASIN_TIMESERIES', 1484438400) as subquery where select * &...

最后，我尝试将查询的前部留在mapfile中，只将子查询转换为存储过程：

映射文件：

DATA "geom from (select * from ingest_ffgs_prod_composite_csv('%prod_table%', 1484438400)) as subquery using unique gid using srid=4326"

存储过程：

RETURN QUERY
             EXECUTE 'SELECT g.gid,
                             g.geom,
                             g.basin,
                             a.date,
                             a.value
                             FROM sarffg_basins_00_regional_3sec AS g
                             JOIN '||tablename_ts||' AS a
                             ON g.basin = a.basin
                             WHERE a.date = '''||adj_timestamp||''');

这让我失望：

[Wed Jan 25 02:35:36 2017].527302 msDrawMap(): Image handling error. Failed to draw layer named 'regional_basin_values'.
[Wed Jan 25 02:35:36 2017].617289 msPostGISLayerWhichShapes(): Query error. Error executing query: ERROR:  column "VALUE" does not exist
LINE 1: select "VALUE",encode(ST_AsBinary(ST_Force2D("geom"),'NDR'),...
           ^

[Wed Jan 25 02:35:36 2017].617511 msDrawMap(): Image handling error. Failed to draw layer named 'regional_basin_product'.
[Wed Jan 25 02:35:42 2017].103566 msPostGISLayerWhichShapes(): Query error. Error executing query: ERROR:  column "VALUE" does not exist
LINE 1: select "VALUE",encode(ST_AsBinary(ST_Force2D("geom"),'NDR'),...

这里执行的return语句是：

RETURN QUERY
                 EXECUTE 'SELECT g.'||quote_ident('gid')||',
                                 g.'||quote_ident('geom')||',
                                 g.'||quote_ident('basin')||',
                                 a.'||quote_ident('DATE')||',
                                 a.'||quote_ident('VALUE')||'
                                 FROM sarffg_basins_00_regional_3sec AS g JOIN '||quote_ident(prod_table)||' AS a
                                 ON g.'||quote_ident('basin')||' = a.'||quote_ident('BASIN')||'
                                 WHERE a.'||quote_ident('DATE')||' = '''||adj_timestamp||'''';

我已经确认prod_table有一个名为“VALUE”的列，所以我不确定为什么会看到这个错误。同样重要的是要注意从psql中调用我的过程不会产生错误。

（我有两个非常相似的return语句，因为我的代码查询一个带有大写列名称的表，如果没有该表，它会从一个没有大写名称的CSV中创建一个。）

也不确定它是否相关，但这是我的函数返回的内容：

RETURNS table (
           gid integer,
           geom geometry(MultiPolygon,4326),
           basin double precision,
           date timestamptz,
           value double precision
           )

非常感谢任何帮助

Answer 1

我想，你在过滤器中使用字段VALUE或在mapfile中使用类似的东西（很难说没有mapfile）。此过滤器必须具有大写列名称，这就是原始查询也大写列名称的原因：

select g.gid, g.geom, g.basin, a.\"DATE\", a.\"VALUE\" from....

如果是这样，您只需要将过程返回的列大写：

RETURNS table (
           gid integer,
           geom geometry(MultiPolygon,4326),
           basin double precision,
           "DATE" timestamptz,
           "VALUE" double precision
           )

请记住，在PostgreSql中，如果您使用双引号括起来，则列和表名称的情况很重要。这个查询：

SELECT VALUE from ...

与案例无关，而这一个：

SELECT "VALUE" from ...

确实需要一个包含大写列名的表。具有大写列名称的表需要双引号：

CREATE TABLE test ("VALUE" text, .....

“USING”

1 个答案: