在瀚高数据库中实现汉字转拼音

Posted 2022-02-05 瀚高PG实验室

目录
环境
文档用途
详细信息

环境
系统平台：Linux x86-64 Red Hat Enterprise Linux 7
版本：5.6.5
文档用途
在瀚高数据库中实现汉字转拼音的功能，获取姓名的首字母。

详细信息
1、首先创建汉字和拼音首字母的对照表

create table pinyin (hz varchar(1),py varchar(6),zm varchar(1));

2、未收录汉字插入到以下表

create table new_discover (hz varchar(1) primary key,py varchar(6),zm varchar(1));

3、创建输出type和函数，函数返回的是数组

CREATE TYPE t_py_zm as (c1 text[],c2 text[]);

4、创建函数get_py_zm（）

CREATE OR REPLACE FUNCTION get_py_zm(i_hz text)

  RETURNS SETOF t_py_zm AS

$BODY$

DECLARE

v_hz text;

i int;

v_sql1 text;

v_sql2 text;

v_sql3 text;

v_sql4 text;

v_sql text;

v_max_id int;

v_id int;

BEGIN

–创建临时表用来存储每个汉字和字母

set client_min_messages = warning;

CREATE TEMPORARY TABLE IF NOT EXISTS tmp_get_py_zm (id int,py varchar(6),zm varchar(1)) ON COMMIT DELETE ROWS;

truncate table tmp_get_py_zm;

i := 0;

–拆分输入参数为每个字符并插入到临时表里

for v_hz in select regexp_split_to_table(i_hz,'') loop

  if ascii(v_hz) > 255 then

    insert into tmp_get_py_zm select i,py,zm from pinyin where hz=v_hz;

  else

    insert into tmp_get_py_zm values(i,v_hz,v_hz);

  end if;

  if not found then

    perform 1 from new_discover where hz = v_hz;

    if not found then

      insert into new_discover(hz) values(v_hz);

    end if;

    insert into tmp_get_py_zm values(i,'?','?');

  end if;

  i := i+1;

end loop;



select max(id) into v_max_id from tmp_get_py_zm;

if v_max_id > 0 then

  v_sql1 := '';

  v_sql3 := '';

  v_sql4 := '';

  v_id := 0;

  for v_id in select generate_series(0,v_max_id) loop

    if v_id <> v_max_id then

      v_sql1 := v_sql1||'(select py,zm from tmp_get_py_zm where id='||v_id||') as t'||v_id||',';

      v_sql3 := v_sql3||'t'||v_id||'.py::text||';

      v_sql4 := v_sql4||'t'||v_id||'.zm::text||';

    else

      v_sql1 := v_sql1||'(select py,zm from tmp_get_py_zm where id='||v_id||') as t'||v_id;

      v_sql3 := v_sql3||'t'||v_id||'.py::text';

      v_sql4 := v_sql4||'t'||v_id||'.zm::text';

      v_sql := 'select array_agg('||v_sql3||'),array_agg('||v_sql4||') from '||v_sql1;

    end if;

  end loop;

else

  v_sql := 'select array_agg(py::text),array_agg(zm::text) from tmp_get_py_zm';

end if;



return query execute v_sql;

return;

END;

$BODY$

  LANGUAGE plpgsql VOLATILE

  COST 100

  ROWS 1000;

ALTER FUNCTION get_py_zm(text)

  OWNER TO sysdba;