问题描述
我正在尝试使用导入到FME Desktop的Oracle DB中的shapefile(代表街道中心线)创建空间网络. "CENTRELINES"空间对象包含一个GEOM列，我想以此为基础进行网络分析，以基于路线距离作为成本属性在救护院(点)之间分配救护车设施(点).欢迎提供有关在Oracle Spatial中解决此病态问题的方法的任何建议，但主要问题是我是SQL的初学者.我已经使用了Oracle的文档组成以下SQL语句:
I am trying to create a spatial network from a shapefile (representing street centrelines) imported into an Oracle DB with FME Desktop. The 'CENTRELINES' spatial object contains a GEOM column that I'd like to use as the basis for a network analysis to allocate ambulance facilities (points) among retirement homes (points) based on route distance as a cost attribute. Any advice on methodology for approaching this morbid problem in Oracle Spatial would be welcome, but the main issue is that I am a beginner at SQL. I've used Oracle's documentation to compose the following SQL statement:
-- create an LRS geometry network
EXEC SDO_NET.CREATE_LRS_NETWORK(
'LRS_net', -- network name
'CENTRELINES', -- LRS geometry table name
'GEOM', -- LRS geometry column name
1, -- number of hierarchy levels
FALSE, -- directed link?
TRUE -- node with cost?
);
脚本输出以下内容:
Error starting at line 2 in command:
EXEC SDO_NET.CREATE_LRS_NETWORK(
Error report:
ORA-06550: line 1, column 34:
PLS-00103: Encountered the symbol ";" when expecting one of the following:
( ) - + case mod new not null <an identifier>
<a double-quoted delimited-identifier> <a bind variable>
table continue avg count current exists max min prior sql
stddev sum variance execute multiset the both leading
trailing forall merge year month day hour minute second
timezone_hour timezone_minute timezone_region timezone_abbr
time timestamp interval date
<a string literal with character set specification>
06550. 00000 - "line %s, column %s:\n%s"
*Cause: Usually a PL/SQL compilation error.
*Action:
...
Error starting at line 9 in command:
)
Error report:
Unknown Command
我知道第二行产生了错误:
I understand that line 2 is producing the error:
PLS-00103: Encountered the symbol ";" when expecting one of the following...
鉴于结束SQL查询需要使用分号，这是为什么呢?
Given that semi-colons are required to end an SQL query, why is this a problem?
以下脚本通过添加开始/结束来产生网络:
The following script produced the network by adding begin/end:
begin
SDO_NET.CREATE_LRS_NETWORK(
'LRS_net',
'CENTRELINES',
'GEOM',
1,
FALSE,
TRUE);
end;
谢谢您的帮助！
推荐答案
如文档，通常必须在一行中输入SQL * Plus execute命令:
As noted in the documentation, the SQL*Plus execute command normally has to be entered on one line:
实际上试图将其翻译为
BEGIN
SDO_NET.CREATE_LRS_NETWORK(;
END;
/
...(可能显然是这样写的)无效的PL/SQL.与空间调用本身无关.如果确实要将其拆分为多行，则可以仅使用显式的begin/end而不是速记的exec.
... which is (maybe obviously when written like that) not valid PL/SQL. Nothing to do with the spatial call per se. If you do want to split it onto multiple lines, you can just use an explicit begin/end rather than the shorthand exec.
第二个问题可能表明您已经多次运行了简短版本，尽管它不是我非常熟悉的功能.但与初始分号错误无关. (而且，严格地不需要使用分号来结束 SQL 语句，但这是下一次的细节...).
The second problem maybe suggests that you've run the short version more than once, though it isn't a feature I'm very familiar with; but is not related to the initial semi-colon error. (Also, a semi-colon isn't strictly needed to end a SQL statement, but that's a detail for another time...).
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