[DB][ORACLE]根据中文拼音首字母排序、取得中文拼音首字母函数

根据中文拼音首字母排序、取得中文拼音首字母函数

介绍根据中文的首字母、笔画、部首排序函数【NLSSORT】：

1）、首字母

SELECT * FROM T_TABLE ORDER BY NLSSORT(NAME, 'NLS_SORT=SCHINESE_PINYIN_M');

2）、笔画

SELECT * FROM T_TABLE ORDER BY NLSSORT(NAME, 'NLS_SORT=SCHINESE_STROKE_M');

3）、部首

SELECT * FROM T_TABLE ORDER BY NLSSORT(NAME, 'NLS_SORT=SCHINESE_RADICAL_M');

列表一行汉字

WITH A AS

(SELECT '获取汉字拼音首字母' W FROM DUAL)

SELECT SUBSTR(W, ROWNUM, 1) FROM A

CONNECT BY ROWNUM <= (SELECT LENGTH(W) FROM A);

返回结果

获

取

汉

字

拼

音

首

字

母

用汉字字符集对这个列表进行排序

WITH A AS

(SELECT '获取汉字拼音首字母' W FROM DUAL)

SELECT SUBSTR(W, ROWNUM, 1) FROM A

CONNECT BY ROWNUM <= (SELECT LENGTH(W) FROM A)

ORDER BY NLSSORT(SUBSTR(W, ROWNUM, 1), 'NLS_SORT=SCHINESE_PINYIN_M');

返回结果

汉

获

母

拼

取

首

音

字

字

那么根据这个原理，上面输入一个拼音A打头的字"澳"，后面输入一个B大头的字"吧"，找到每个音节的起止的汉字是哪个

WITH A AS

(

SELECT ROWNUM RN, CHR(ROWNUM) C FROM DUAL CONNECT BY LEVEL <= 65535

)

SELECT * FROM A WHERE LENGTHB(C) = 2

AND RN > 32768

AND NLSSORT(C, 'NLS_SORT=SCHINESE_PINYIN_M') > NLSSORT('澳', 'NLS_SORT=SCHINESE_PINYIN_M')

AND NLSSORT(C, 'NLS_SORT=SCHINESE_PINYIN_M') < NLSSORT('吧', 'NLS_SORT=SCHINESE_PINYIN_M')

ORDER BY NLSSORT(C, 'NLS_SORT=SCHINESE_PINYIN_M');

根据返回的结果，就能看到，A的结束和B的开始的汉子分别是：“驁” “八”，依次类推可以找到其他的分界点，那么最后的函数就是如下：

CREATE OR REPLACE FUNCTION F_TRANS_PINYIN_CAPITAL(P_NAME IN VARCHAR2) RETURN VARCHAR2 AS

V_COMPARE VARCHAR2(100);

V_RETURN VARCHAR2(4000);

FUNCTION F_NLSSORT(P_WORD IN VARCHAR2) RETURN VARCHAR2 AS

BEGIN

RETURN NLSSORT(P_WORD, 'NLS_SORT=SCHINESE_PINYIN_M');

END;

BEGIN

FOR I IN 1..LENGTH(P_NAME) LOOP

V_COMPARE := F_NLSSORT(SUBSTR(P_NAME, I, 1));

IF V_COMPARE >= F_NLSSORT(' 吖 ') AND V_COMPARE <= F_NLSSORT('驁 ') THEN

V_RETURN := V_RETURN || 'a';

ELSIF V_COMPARE >= F_NLSSORT('八 ') AND V_COMPARE <= F_NLSSORT('簿 ') THEN

V_RETURN := V_RETURN || 'b';

ELSIF V_COMPARE >= F_NLSSORT('嚓 ') AND V_COMPARE <= F_NLSSORT('錯 ') THEN

V_RETURN := V_RETURN || 'c';

ELSIF V_COMPARE >= F_NLSSORT('咑 ') AND V_COMPARE <= F_NLSSORT('鵽 ') THEN

V_RETURN := V_RETURN || 'd';

ELSIF V_COMPARE >= F_NLSSORT('妸 ') AND V_COMPARE <= F_NLSSORT('樲 ') THEN

V_RETURN := V_RETURN || 'e';

ELSIF V_COMPARE >= F_NLSSORT('发 ') AND V_COMPARE <= F_NLSSORT('猤 ') THEN

V_RETURN := V_RETURN || 'f';

ELSIF V_COMPARE >= F_NLSSORT('旮 ') AND V_COMPARE <= F_NLSSORT('腂 ') THEN

V_RETURN := V_RETURN || 'g';

ELSIF V_COMPARE >= F_NLSSORT('妎 ') AND V_COMPARE <= F_NLSSORT('夻 ') THEN

V_RETURN := V_RETURN || 'h';

ELSIF V_COMPARE >= F_NLSSORT('丌 ') AND V_COMPARE <= F_NLSSORT('攈 ') THEN

V_RETURN := V_RETURN || 'j';

ELSIF V_COMPARE >= F_NLSSORT('咔 ') AND V_COMPARE <= F_NLSSORT('穒 ') THEN

V_RETURN := V_RETURN || 'k';

ELSIF V_COMPARE >= F_NLSSORT('垃 ') AND V_COMPARE <= F_NLSSORT('擽 ') THEN

V_RETURN := V_RETURN || 'l';

ELSIF V_COMPARE >= F_NLSSORT('嘸 ') AND V_COMPARE <= F_NLSSORT('椧 ') THEN

V_RETURN := V_RETURN || 'm';

ELSIF V_COMPARE >= F_NLSSORT('拏 ') AND V_COMPARE <= F_NLSSORT('瘧 ') THEN

V_RETURN := V_RETURN || 'n';

ELSIF V_COMPARE >= F_NLSSORT('筽 ') AND V_COMPARE <= F_NLSSORT('漚 ') THEN

V_RETURN := V_RETURN || 'o';

ELSIF V_COMPARE >= F_NLSSORT('妑 ') AND V_COMPARE <= F_NLSSORT('曝 ') THEN

V_RETURN := V_RETURN || 'p';

ELSIF V_COMPARE >= F_NLSSORT('七 ') AND V_COMPARE <= F_NLSSORT('裠 ') THEN

V_RETURN := V_RETURN || 'q';

ELSIF V_COMPARE >= F_NLSSORT('亽 ') AND V_COMPARE <= F_NLSSORT('鶸 ') THEN

V_RETURN := V_RETURN || 'r';

ELSIF V_COMPARE >= F_NLSSORT('仨 ') AND V_COMPARE <= F_NLSSORT('蜶 ') THEN

V_RETURN := V_RETURN || 's';

ELSIF V_COMPARE >= F_NLSSORT('侤 ') AND V_COMPARE <= F_NLSSORT('籜 ') THEN

V_RETURN := V_RETURN || 't';

ELSIF V_COMPARE >= F_NLSSORT('屲 ') AND V_COMPARE <= F_NLSSORT('鶩 ') THEN

V_RETURN := V_RETURN || 'w';

ELSIF V_COMPARE >= F_NLSSORT('夕 ') AND V_COMPARE <= F_NLSSORT('鑂 ') THEN

V_RETURN := V_RETURN || 'x';

ELSIF V_COMPARE >= F_NLSSORT('丫 ') AND V_COMPARE <= F_NLSSORT('韻 ') THEN

V_RETURN := V_RETURN || 'y';

ELSIF V_COMPARE >= F_NLSSORT('帀 ') AND V_COMPARE <= F_NLSSORT('咗 ') THEN

V_RETURN := V_RETURN || 'z';

END IF;

END LOOP;

RETURN V_RETURN;

END;

测试一下：

SELECT F_TRANS_PINYIN_CAPITAL('王德封') FROM DUAL

返回首字母：wdf