瀚高数据库自定义操作符‘!~~‘

Posted 2022-06-27 瀚高PG实验室

瀚高数据库
目录
环境
文档用途
详细信息

环境
系统平台：Microsoft Windows (64-bit) 10
版本：5.6.5
文档用途
解决应用程序中SQL语句使用!~~匹配操作符时，遇到的错误：

ERROR: 42883: operator does not exist: integer !~~ integer

  Hint: No operator matches the given name and argument type(s). You might need to add explicit type casts.

详细信息
一，测试准备

创建表并插入数据：

create TABLE oper_test(first_num int);
insert into oper_test values(234),(446),(467);

二，测试查询

select (446 !~~ first_num) newlist from oper_test;

三，解决方案：自定义操作符

CREATE OR REPLACE FUNCTION hgdb_catalog.intnlike(integer,integer)
  RETURNS boolean AS $$
  select $1::varchar !~~ $2::varchar;
  $$
  LANGUAGE sql strict;
ALTER FUNCTION intnlike(integer, integer)
  OWNER TO highgo;
COMMENT ON FUNCTION intnlike(integer,integer) IS 'implementation of !~~ operator';
create operator hgdb_catalog.!~~(
    procedure = hgdb_catalog.intnlike,
    leftarg = integer,
    rightarg = integer
);

四，再次查询