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/*****************************************************
1.ÅжÏ×Ö·û´®ÊÇ·ñΪºº×Ö ·µ»ØÖµ£º1-ºº×Ö 0-·Çºº×Ö
*****************************************************/
DROP FUNCTION IF EXISTS fc_is_hanzi;
CREATE FUNCTION  fc_is_hanzi(
p_str VARCHAR(1024)
)
    RETURNS int(11)
    NOT DETERMINISTIC
    SQL SECURITY DEFINER
    COMMENT '¼ì²é×Ö·û´®ÊÇ·ñΪºº×Ö'
BEGIN
/*¼ì²é×Ö·û´®ÊÇ·ñΪºº×Ö ·µ»ØÖµ£º1-ºº×Ö 0-·Çºº×Ö*/
    DECLARE _ret, i, other_cnt, l_acode INT DEFAULT 0;
    SET _ret = 0;
    SET i = 1;
    SET other_cnt = 0;
    SET l_acode = 0;
    WHILE i <= CHAR_LENGTH(p_str) DO
        SET l_acode = ASCII(SUBSTRING(p_str, i, 1));
        IF  l_acode<124 or l_acode>254 THEN
            SET other_cnt = other_cnt + 1;
        END IF;
        SET i = i + 1;
    END WHILE;
    IF other_cnt = 0 THEN
        SET _ret = 1;
    ELSE
        SET _ret = 0;
    END IF;
    RETURN _ret;
END;
/*****************************************************
2.ÅжÏÈÕÆÚ¸ñʽÊÇ·ñÕýÈ·£¨·µ»ØÖµ£º1-ÕýÈ· 0-´íÎó£©
*****************************************************/
DROP FUNCTION IF EXISTS  fc_ck_date;
CREATE FUNCTION fc_ck_date(
p_cont CHAR(32) 
)
    RETURNS tinyint(4)
    NOT DETERMINISTIC
    SQL SECURITY DEFINER
    COMMENT 'Åж¨ÈÕÆÚ¸ñʽÊÇ·ñÕýÈ·'
BEGIN
/*Åж¨ÈÕÆÚ¸ñʽÊÇ·ñÕýÈ·£¨·µ»ØÖµ£º1-ÕýÈ· 0-´íÎó£©*/
/*ÊäÈëÖµ¸ñʽΪ£ºyyyyMMdd »ò yyyy-MM-dd*/
IF(SELECT DATE_FORMAT(p_cont


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MySQLµÄÍâ¼üºÍ²ÎÕÕÍêÕûÐÔ

Ò»¡¢²ÎÕÕÍêÕûÐÔ(Referential integrity)ºÍÍâ¼ü(foreign key)
²ÎÕÕÍêÕûÐÔ(Referential integrity)ÊÇÓÃÓÚÔ¼¶¨Á½¸ö¹ØÏµÖ®¼äµÄÁªÏµ£¬ÀíÂÛÉϹ涨£ºÈôMÊǹØÏµSÖеÄÒ»ÊôÐÔ×飬ÇÒMÊÇÁíÒ»¹ØÏµZµÄÖ÷¹Ø¼ü×Ö£¬Ôò³ÆMΪ¹ØÏµS¶ÔÓ¦¹ØÏµZµÄÍâ¹Ø¼ü×Ö¡£ÈôMÊǹØÏµSµÄÍâ¹Ø¼ü×Ö£¬ÔòSÖÐÿһ¸öÔª×éÔÚMÉϵÄÖµ±ØÐëÊÇ¿ÕÖµ»òÊǶÔÓ¦¹ØÏµZÖÐij¸öÔª×éµÄÖ÷¹ ......

mysql ²ÎÊý(2)

lect ASIN('foo');
¡¡¡¡-> 0.000000
ATAN(N)
¡¡·µ»ØNµÄ·´ÕýÇÐÖµ
mysql> select ATAN(2);
¡¡¡¡-> 1.107149
mysql> select ATAN(-2);
¡¡¡¡-> -1.107149
ATAN2(X,Y)
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mysql> select ATAN(-2,2);
¡¡¡¡-> -0.785398
mysql> ......

mysql ¶ÔvarcharÐÍÊý×ÖÅÅÐò

×Ö¶ÎpageNum
1£¬6£¬9£¬11
Ï£ÍûÅÅÐò˳ÐòΪ1£¬6£¬9£¬11
µ«ÊÇʵ¼ÊÅÅÐòΪ1£¬11£¬6£¬9
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order by pageNum+0
order by pageNum×1
²»ÖªµÀΪʲôorder by pageNum×1 Êý¾Ý¿âͨ²»¹ý
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mysql ÒÅÍüÃÜÂëºóÖØÐÂÉèÖÃÃÜÂë²½Öè

1. ÓÃcmd½øÈëmysql/binĿ¼
2. ÊäÈëmysqld-nt --skip-grant-tables
3. ÐÂÆôcmd ÊäÈëmysqladmin -u root flush-privileges password root
4. mysqladmin -u root -p shutdown
5. ÊäÈëеÄÃÜÂ룺XXX
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Mysql µÄһЩ¼òµ¥µÄÃüÁî

¼ÇÏÂЩlinuxÏÂmysqlµÄ²Ù×÷£¬ÒÔ±ãÒÔºó²é¿´£º
1. Æô¶¯£¬¹Ø±Õmysql£º
Æô¶¯£ºsudo /etc/init.d/mysql start
¹Ø±Õ£º/usr/bin/mysqladmin -uroot -p shutdown
2.ÏÔʾ ±í½á¹¹£º
describe:tableName
3.±¸·Ý£º
Ö»±¸·Ý±í½á¹¹£ºmysqldump -d -uroot -p  DataBase TableName> xxx.sql
±¸·Ý±í½á¹¹ºÍÊý¾Ý£ºmysqldump -uro ......
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