小编典典

Oracle在多个表和联接上进行文本搜索

sql

我有以下SQL语句。

select emp_no,dob,dept_no from v_depts
where catsearch (emp_no,'abc',NULL) > 0
or
catsearch (dept_no,'abc',NULL) > 0

v_depts视图在哪里。

现在,我想添加一个或多个表作为联接,以便我可以在列上进行文本搜索,例如employee_details包含员工信息,并且可以与emp_no

我已经在employee_details表上为emp_name列创建了索引,但是由于我将sql语句修改为,因此无法与v_depts一起进行搜索

select a.emp_no,a.dob,a.dept_no from v_depts a left outer join employee_details b
on (a.emp_no = b.emp_no)
where catsearch (a.emp_no,'abc',NULL) > 0
or
catsearch (a.dept_no,'abc',NULL) > 0
or
catsearch (b.emp_name,'abc',NULL) > 0

它给我错误

ORA-20000: Oracle Text error:
DRG-10849: catsearch does not support functional invocation
DRG-10599: column is not indexed

即使我已经为employee_details表中的emp_name列创建了索引。我怎么解决这个问题?

emp_name的索引语句

CREATE INDEX IDX_EMP_DETAILS ON EMPLOYEE_DETAILS(EMP_NAME)INDEXTYPE IS CTXSYS.CTXCAT

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2021-03-23

共1个答案

小编典典

我通常通过实例化它们的结构化XML视图,然后在整个XML上创建索引,来解决对不同表的多个列进行全文搜索的问题。

此解决方案是通用的,还使您可以自由搜索:整个视图或仅一个子路径。缺点是管理通常无法快速刷新的MV的刷新。但是全文索引的更新通常也不是实时的,因此您可以对其进行调度。

-- Crating the view
CREATE MATERIALIZED VIEW fulltext_helper
NOLOGGING
BUILD DEFERRED
REFRESH COMPLETE ON DEMAND
AS
SELECT 
   a.dob, -- we don't need to fulltext on him
   XMLELEMENT(helper,
     XMLFOREST(a.emp_no AS emp_no, 
              a.dept_no AS dept_no, 
              b.emp_name AS emp_name)
   ) AS indexme
FROM v_depts a 
LEFT OUTER JOIN employee_details b
ON (a.emp_no = b.emp_no);

-- Creating the index
BEGIN
    ctx_ddl.create_preference('fulltext_helper_lexer', 'BASIC_LEXER');
    ctx_ddl.create_preference('fulltext_helper_filter', 'NULL_FILTER');
END;
/
CREATE INDEX fulltext_helper_index ON fulltext_helper (indexme)
INDEXTYPE IS CTXSYS.CONTEXT PARAMETERS (
    'DATASTORE CTXSYS.DIRECT_DATASTORE
     LEXER fulltext_helper_lexer
     FILTER fulltext_helper_filter');

-- Searching the whole data
SELECT * FROM fulltext_helper
WHERE contains(indexme, '{abc} INPATH (/helper)') > 0;

-- Searching only on "empno"
SELECT * FROM fulltext_helper
WHERE contains(indexme, '{abc} INPATH (/helper/emp_no)') > 0;
2021-03-23