如何在mysql中拆分名称字符串？

如何在mysql中拆分名称字符串？

例如：

name
-----
Sachin ramesh tendulkar
Rahul dravid

像这样分割名称firstname,middlename,lastname：

firstname   middlename    lastname
---------  ------------   ------------
sachin     ramesh         tendulkar
rahul      dravid

我已将此答案分为两种方法。第一种方法会将您的全名字段分为名字，中间名和姓氏。如果没有中间名，则中间名将显示为NULL。

SELECT
   SUBSTRING_INDEX(SUBSTRING_INDEX(fullname, ' ', 1), ' ', -1) AS first_name,
   If(  length(fullname) - length(replace(fullname, ' ', ''))>1,  
       SUBSTRING_INDEX(SUBSTRING_INDEX(fullname, ' ', 2), ' ', -1) ,NULL) 
           as middle_name,
   SUBSTRING_INDEX(SUBSTRING_INDEX(fullname, ' ', 3), ' ', -1) AS last_name
FROM registeredusers

第二种方法将中间名视为姓氏的一部分。我们只会从您的全名字段中选择一个名字和姓氏列。

SELECT
   SUBSTRING_INDEX(SUBSTRING_INDEX(fullname, ' ', 1), ' ', -1) AS first_name,
    TRIM( SUBSTR(fullname, LOCATE(' ', fullname)) ) AS last_name
FROM registeredusers

您可以使用substr，locate，substring_index等完成很多有趣的工作。请查看手册，以了解真正的困惑。http://dev.mysql.com/doc/refman/5.0/zh-CN/string-functions.html

好吧，我以前没有用过，所以我决定创建一个真正简单的split函数，希望对您有所帮助：

DECLARE inipos INTEGER;
DECLARE endpos INTEGER;
DECLARE maxlen INTEGER;
DECLARE item VARCHAR(100);
DECLARE delim VARCHAR(1);

SET delim = '|';
SET inipos = 1;
SET fullstr = CONCAT(fullstr, delim);
SET maxlen = LENGTH(fullstr);

REPEAT
    SET endpos = LOCATE(delim, fullstr, inipos);
    SET item =  SUBSTR(fullstr, inipos, endpos - inipos);

    IF item <> '' AND item IS NOT NULL THEN           
        USE_THE_ITEM_STRING;
    END IF;
    SET inipos = endpos + 1;
UNTIL inipos >= maxlen END REPEAT;

这是我使用的分割功能：

--
-- split function
--    s   : string to split
--    del : delimiter
--    i   : index requested
--

DROP FUNCTION IF EXISTS SPLIT_STRING;

DELIMITER $

CREATE FUNCTION 
   SPLIT_STRING ( s VARCHAR(1024) , del CHAR(1) , i INT)
   RETURNS VARCHAR(1024)
   DETERMINISTIC -- always returns same results for same input parameters
    BEGIN

        DECLARE n INT ;

        -- get max number of items
        SET n = LENGTH(s) - LENGTH(REPLACE(s, del, '')) + 1;

        IF i > n THEN
            RETURN NULL ;
        ELSE
            RETURN SUBSTRING_INDEX(SUBSTRING_INDEX(s, del, i) , del , -1 ) ;        
        END IF;

    END
$

DELIMITER ;


SET @agg = "G1;G2;G3;G4;" ;

SELECT SPLIT_STRING(@agg,';',1) ;
SELECT SPLIT_STRING(@agg,';',2) ;
SELECT SPLIT_STRING(@agg,';',3) ;
SELECT SPLIT_STRING(@agg,';',4) ;
SELECT SPLIT_STRING(@agg,';',5) ;
SELECT SPLIT_STRING(@agg,';',6) ;

MySQL中没有字符串分割功能。因此您必须创建自己的函数。这将为您提供帮助。有关此链接的更多详细信息。

功能：

CREATE FUNCTION SPLIT_STR(
  x VARCHAR(255),
  delim VARCHAR(12),
  pos INT
)
RETURNS VARCHAR(255)
RETURN REPLACE(SUBSTRING(SUBSTRING_INDEX(x, delim, pos),
       LENGTH(SUBSTRING_INDEX(x, delim, pos -1)) + 1),
       delim, '');

用法：

SELECT SPLIT_STR(string, delimiter, position)

例：

SELECT SPLIT_STR('a|bb|ccc|dd', '|', 3) as third;

+-------+
| third |
+-------+
| ccc   |
+-------+

您还可以使用bewlo之一：

SELECT SUBSTRING_INDEX(Name, ' ', 1) AS fname,
SUBSTRING_INDEX(SUBSTRING_INDEX(Name,' ', 2), ' ',-1) AS mname,
SUBSTRING_INDEX(Name, ' ', -1) as lname FROM mytable;

select (case when locate('(', LocationName) = 0 
        then 
            horse_name
        else 
           left(LocationName, locate('(', LocationName) - 1)
       end) as Country            
from   tblcountry;

在第二个空格分隔符之后获取字符串的其余部分

SELECT
   SUBSTRING_INDEX(SUBSTRING_INDEX('Sachin ramesh tendulkar', ' ', 1), ' ', -1) AS first_name, 
       SUBSTRING_INDEX(SUBSTRING_INDEX('Sachin ramesh tendulkar', ' ', 2), ' ', -1) 
           AS middle_name,
   SUBSTRING('Sachin ramesh tendulkar',LENGTH(SUBSTRING_INDEX('Sachin ramesh tendulkar', ' ', 2))+1) AS last_name

SELECT
    p.fullname AS 'Fullname',
    SUBSTRING_INDEX(p.fullname, ' ', 1) AS 'Firstname',
    SUBSTRING(p.fullname, LOCATE(' ',p.fullname), 
        (LENGTH(p.fullname) - (LENGTH(SUBSTRING_INDEX(p.fullname, ' ', 1)) + LENGTH(SUBSTRING_INDEX(p.fullname, ' ', -1))))
    ) AS 'Middlename',
    SUBSTRING_INDEX(p.fullname, ' ', -1) AS 'Lastname',
    (LENGTH(p.fullname) - LENGTH(REPLACE(p.fullname, ' ', '')) + 1) AS 'Name Qt'
FROM people AS p
LIMIT 100; 

说明：

查找名字和姓氏很容易，您只需要使用SUBSTR_INDEX函数，魔术就发生在中间名中，在SUBSTR中使用Locate来查找名字的第一个空格位置和完整长度-（LENGTH名字+ LENGTH姓氏）以获取所有中间名。

请注意，姓氏和名字的LENGTH是使用SUBSTR_INDEX计算的

concat(upper(substring(substring_index(NAME, ' ', 1) FROM 1 FOR 1)), lower(substring(substring_index(NAME, ' ', 1) FROM 2 FOR length(substring_index(NAME, ' ', 1))))) AS fname,
CASE 
WHEN length(substring_index(substring_index(NAME, ' ', 2), ' ', -1)) > 2 THEN 
  concat(upper(substring(substring_index(substring_index(NAME, ' ', 2), ' ', -1) FROM 1 FOR 1)), lower(substring(substring_index(substring_index(f.nome, ' ', 2), ' ', -1) FROM 2 FOR length(substring_index(substring_index(f.nome, ' ', 2), ' ', -1)))))
  ELSE 
  CASE 
  WHEN length(substring_index(substring_index(f.nome, ' ', 3), ' ', -1)) > 2 THEN 
    concat(upper(substring(substring_index(substring_index(f.nome, ' ', 3), ' ', -1) FROM 1 FOR 1)), lower(substring(substring_index(substring_index(f.nome, ' ', 3), ' ', -1) FROM 2 FOR length(substring_index(substring_index(f.nome, ' ', 3), ' ', -1)))))
  END 
END 
AS mname

CREATE DEFINER=`root`@`localhost` FUNCTION `getNameInitials`(`fullname` VARCHAR(500), `separator` VARCHAR(1)) RETURNS varchar(70) CHARSET latin1
    DETERMINISTIC
BEGIN
DECLARE `result` VARCHAR(500) DEFAULT '';
DECLARE `position` TINYINT;



SET `fullname` = TRIM(`fullname`);

SET `position` = LOCATE(`separator`, `fullname`);

IF NOT `position`
THEN RETURN LEFT(`fullname`,1);
END IF;

SET `fullname` = CONCAT(`fullname`,`separator`);
SET `result` = LEFT(`fullname`, 1);

cycle: LOOP
    SET `fullname` = SUBSTR(`fullname`, `position` + 1);
    SET `position` = LOCATE(`separator`, `fullname`);

    IF NOT `position` OR NOT LENGTH(`fullname`)
    THEN LEAVE cycle;
    END IF;

    SET `result` = CONCAT(`result`,LEFT(`fullname`, 1));
   -- SET `result` = CONCAT_WS(`separator`, `result`, `buffer`);
END LOOP cycle;

RETURN upper(`result`);
END

1.在mysql中执行此功能。2.这将创建一个功能。现在，您可以在任何位置使用此功能。

 SELECT `getNameInitials`('Kaleem Ul Hassan', ' ') AS `NameInitials`;

3.上面的getNameInitails第一个参数是您要过滤的字符串，第二个参数是您要在其上分隔字符串的旁观者字符。4.在上面的示例中，“ Kaleem Ul Hassan”是名称，我想输入缩写，而我的分隔符是空格“”。

我们将课程名称和章节名称的值存储在单个列的章节名称中。

存储的值如下：“ JAVA：多态”

您需要检索CourseName：JAVA和ChapterName：多态

以下是要检索的SQL选择查询。

       SELECT   
          SUBSTRING_INDEX(SUBSTRING_INDEX(ChapterName, ' ', 1), ' ', -1) AS 
       CourseName,

       REPLACE(TRIM(SUBSTR(ChapterName, LOCATE(':', ChapterName)) ),':','') AS 
       ChapterName
       FROM Courses where `id`=1;

如果对此有任何疑问，请告诉我。

要在第二个空格分隔符之后获取字符串的其余部分：

SELECT SUBSTRING_INDEX(SUBSTRING_INDEX(MsgRest, ' ', 1), ' ', -1) AS EMailID
,  SUBSTRING_INDEX(SUBSTRING_INDEX(MsgRest, ' ', 2), ' ', -1) AS DOB
,  IF(
    LOCATE(' ', `MsgRest`) > 0,
    TRIM(SUBSTRING(SUBSTRING(`MsgRest`, LOCATE(' ', `MsgRest`) +1), 
         LOCATE(' ', SUBSTRING(`MsgRest`, LOCATE(' ', `MsgRest`) +1)) +1)),
    NULL
) AS Person
FROM inbox

您可以使用common_schema并使用该tokenize函数。有关此的更多信息，请单击链接。您的代码最终会像这样：

call tokenize(name, ' ');

但是，请注意，空格不是姓氏和名字的可靠分隔符。例如在西班牙，通常有两个姓氏。

DELIMITER $$

DROP FUNCTION IF EXISTS `split_name`$$

CREATE FUNCTION split_name (p_fullname TEXT, p_part INTEGER)
RETURNS TEXT
    READS SQL DATA
BEGIN
    DECLARE v_words INT UNSIGNED;
    DECLARE v_name TEXT;

    SET p_fullname=RTRIM(LTRIM(p_fullname));

    SET v_words=(SELECT SUM(LENGTH(p_fullname) - LENGTH(REPLACE(p_fullname, ' ', ''))+1));

    IF v_words=1 THEN 
        IF p_part=1 THEN
            SET v_name=p_fullname;
        ELSEIF p_part=2 THEN
            SET v_name=NULL;
        ELSEIF p_part=3 THEN
            SET v_name=NULL;
        ELSE
            SET v_name=NULL;
        END IF; 
    ELSEIF v_words=2 THEN 
        IF p_part=1 THEN
            SET v_name=SUBSTRING(p_fullname, 1, LOCATE(' ', p_fullname) - 1);
        ELSEIF p_part=2 THEN
            SET v_name=SUBSTRING(p_fullname, LOCATE(' ', p_fullname) + 1);
        ELSEIF p_part=3 THEN
            SET v_name=NULL;
        ELSE
            SET v_name=NULL;
        END IF; 
    ELSEIF v_words=3 THEN 
        IF p_part=1 THEN
            SET v_name=SUBSTRING(p_fullname, 1, LOCATE(' ', p_fullname) - 1);
        ELSEIF p_part=2 THEN
            SET p_fullname=SUBSTRING(p_fullname, LOCATE(' ', p_fullname) + 1);
            SET v_name=SUBSTRING(p_fullname, 1, LOCATE(' ', p_fullname) - 1);
        ELSEIF p_part=3 THEN
            SET p_fullname=REVERSE (SUBSTRING(p_fullname, LOCATE(' ', p_fullname) + 1));
            SET p_fullname=SUBSTRING(p_fullname, 1, LOCATE(' ', p_fullname) - 1);
            SET v_name=REVERSE(p_fullname);
        ELSE
            SET v_name=NULL;
        END IF; 
    ELSEIF v_words>3 THEN 
        IF p_part=1 THEN
            SET v_name=SUBSTRING(p_fullname, 1, LOCATE(' ', p_fullname) - 1);
        ELSEIF p_part=2 THEN
            SET p_fullname=REVERSE(SUBSTRING(p_fullname, LOCATE(' ', p_fullname) + 1));
            SET p_fullname=SUBSTRING(p_fullname, LOCATE(' ', p_fullname,SUBSTRING_INDEX(p_fullname,' ',1)+1) + 1);
            SET v_name=REVERSE(p_fullname);
        ELSEIF p_part=3 THEN
            SET p_fullname=REVERSE (SUBSTRING(p_fullname, LOCATE(' ', p_fullname) + 1));
            SET p_fullname=SUBSTRING(p_fullname, 1, LOCATE(' ', p_fullname) - 1);
            SET v_name=REVERSE(p_fullname);
        ELSE
            SET v_name=NULL;
        END IF;
    ELSE
        SET v_name=NULL;
    END IF;
 RETURN v_name; 
END;

SELECT split_name('Md. Obaidul Haque Sarker',1) AS first_name,
split_name('Md. Obaidul Haque Sarker',2) AS middle_name,
split_name('Md. Obaidul Haque Sarker',3) AS last_name

首先创建过程如下：

CREATE DEFINER=`root`@`%` PROCEDURE `sp_split`(str nvarchar(6500), dilimiter varchar(15), tmp_name varchar(50))
BEGIN

    declare end_index   int;
    declare part        nvarchar(6500);
    declare remain_len  int;

    set end_index      = INSTR(str, dilimiter);

    while(end_index   != 0) do

        /* Split a part */
        set part       = SUBSTRING(str, 1, end_index - 1);

        /* insert record to temp table */
        call `sp_split_insert`(tmp_name, part);

        set remain_len = length(str) - end_index;
        set str = substring(str, end_index + 1, remain_len);

        set end_index  = INSTR(str, dilimiter);

    end while;

    if(length(str) > 0) then

        /* insert record to temp table */
        call `sp_split_insert`(tmp_name, str);

    end if;

END

之后，创建过程如下：

CREATE DEFINER=`root`@`%` PROCEDURE `sp_split_insert`(tb_name varchar(255), tb_value nvarchar(6500))
BEGIN
    SET @sql = CONCAT('Insert Into ', tb_name,'(item) Values(?)'); 
    PREPARE s1 from @sql;
    SET @paramA = tb_value;
    EXECUTE s1 USING @paramA;
END

通话测试

CREATE DEFINER=`root`@`%` PROCEDURE `test_split`(test_text nvarchar(255))
BEGIN

    create temporary table if not exists tb_search
        (
            item nvarchar(6500)
        );

    call sp_split(test_split, ',', 'tb_search');

    select * from tb_search where length(trim(item)) > 0;

    drop table tb_search;

END


call `test_split`('Apple,Banana,Mengo');

结合这里的一些答案以创建一个返回字符串部分的SP。

drop procedure if exists SplitStr;
DELIMITER ;;
CREATE PROCEDURE `SplitStr`(IN Str VARCHAR(2000), IN Delim VARCHAR(1))  
    BEGIN
        DECLARE inipos INT;
        DECLARE endpos INT;
        DECLARE maxlen INT;
        DECLARE fullstr VARCHAR(2000);
        DECLARE item VARCHAR(2000);
        create temporary table if not exists tb_split
        (
            item varchar(2000)
        );



        SET inipos = 1;
        SET fullstr = CONCAT(Str, delim);
        SET maxlen = LENGTH(fullstr);

        REPEAT
            SET endpos = LOCATE(delim, fullstr, inipos);
            SET item =  SUBSTR(fullstr, inipos, endpos - inipos);

            IF item <> '' AND item IS NOT NULL THEN           
                insert into tb_split values(item);
            END IF;
            SET inipos = endpos + 1;
        UNTIL inipos >= maxlen END REPEAT;

        SELECT * from tb_split;
        drop table tb_split;
    END;;
DELIMITER ;