mysql 根据英文首字母来查询汉字函数

最新推荐文章于 2024-07-15 02:48:06 发布

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#mysql #duplicates #warnings #hex #query #insert

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本文介绍了一种通过创建拼音表实现快速查询汉字的方法。通过在数据库中建立包含拼音首字母及对应汉字范围的表，可以高效地进行以拼音首字母为条件的查询。

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方法一：建一个拼音表 t_cosler ，存放每个字母开头的第一个汉字的编号和最后一个汉字的编号。

BatchFile code

+------+--------+-------+
| f_PY | cBegin | cEnd  |
+------+--------+-------+
| A    |  45217 | 45252 |
| B    |  45253 | 45760 |
.....
| Z    |  54481 | 55289 |
+------+--------+-------+

然后直接查询就行了。

SQL code

mysql> create table t_cosler(
    ->  f_PY char primary key,
    ->  cBegin  SMALLINT UNSIGNED not null,
    ->  cEnd    SMALLINT UNSIGNED not null
    -> );
Query OK, 0 rows affected (0.09 sec)

mysql> insert into t_cosler values
    -> ('A',0xB0A1,0xB0C4),
    -> ('B',0xB0C5,0xB2C0),
    -> ('C',0xB2C1,0xB4ED),
    -> ('D',0xB4EE,0xB6E9),
    -> ('E',0xB6EA,0xB7A1),
    -> ('F',0xB7A2,0xB8C0),
    -> ('G',0xB8C1,0xB9FD),
    -> ('H',0xB9FE,0xBBF6),
    -> ('J',0xBBF7,0xBFA5),
    -> ('K',0xBFA6,0xC0AB),
    -> ('L',0xC0AC,0xC2E7),
    -> ('M',0xC2E8,0xC4C2),
    -> ('N',0xC4C3,0xC5B5),
    -> ('O',0xC5B6,0xC5BD),
    -> ('P',0xC5BE,0xC6D9),
    -> ('Q',0xC6DA,0xC8BA),
    -> ('R',0xC8BB,0xC8F5),
    -> ('S',0xC8F6,0xCBF9),
    -> ('T',0xCBFA,0xCDD9),
    -> ('W',0xCDDA,0xCEF3),
    -> ('X',0xCEF4,0xD188),
    -> ('Y',0xD1B9,0xD4D0),
    -> ('Z',0xD4D1,0xD7F9);
Query OK, 23 rows affected (0.16 sec)
Records: 23  Duplicates: 0  Warnings: 0

mysql> select * from  o_personnel;
+------+------------+
| A_Id | A_UserName |
+------+------------+
|    1 | 首先       |
|    2 | 检查       |
|    3 | 我们       |
|    4 | 的二       |
|    5 | 进制       |
|    6 | 是否       |
|    7 | 适合       |
|    8 | 你的       |
|    9 | 平台       |
+------+------------+
9 rows in set (0.00 sec)

mysql> select p.*,c.*
    -> from o_personnel p , t_cosler c
    -> where  CONV(HEX(left(A_UserName,1)),16,10) between c.cBegin and c.cEnd;
+------+------------+------+--------+-------+
| A_Id | A_UserName | f_PY | cBegin | cEnd  |
+------+------------+------+--------+-------+
|    4 | 的二       | D    |  46318 | 46825 |
|    2 | 检查       | J    |  48119 | 49061 |
|    5 | 进制       | J    |  48119 | 49061 |
|    8 | 你的       | N    |  50371 | 50613 |
|    9 | 平台       | P    |  50622 | 50905 |
|    1 | 首先       | S    |  51446 | 52217 |
|    6 | 是否       | S    |  51446 | 52217 |
|    7 | 适合       | S    |  51446 | 52217 |
|    3 | 我们       | W    |  52698 | 52979 |
+------+------------+------+--------+-------+
9 rows in set (0.00 sec)

mysql>

查Ｓ开头的

SQL code

mysql> select p.*
    -> from o_personnel p , t_cosler c
    -> where  CONV(HEX(left(A_UserName,1)),16,10) between c.cBegin and c.cEnd
    -> and c.f_PY='S';
+------+------------+
| A_Id | A_UserName |
+------+------------+
|    1 | 首先       |
|    6 | 是否       |
|    7 | 适合       |
+------+------------+
3 rows in set (0.00 sec)

mysql>