mysql怎么精确查找 mysql如何查找数据

mysql精确查找怎么做的select * from t_user where id=123;
必须确保作为条件mysql怎么精确查找的值唯一性
mysql如何精确查找关键词,只提取最近5分钟内记录?【mysql怎么精确查找 mysql如何查找数据】这个要看你具体的记录是创建日期的格式是人什么样的,假如,你的记录的是 unix 时间戳,
SELECT * FROM t WHERE (unix_timestamp(NOW()) - create_time)300;
mysql中如何查询带%的字符可以直接精确查询:
select * from test where name ='%a' -------------查询name为 %a的数据
模糊查询 select * from test where name like '%\%a%';-----------模糊查询name中包含 %a的数据
百度括号查找,例如我要精确查找:mysql(),这应该怎麼查?加双引号
"mysql()"
会比较精确,不过有些时候我觉得技术问题还是某歌比较精确 。
mysql url encode编码后怎么精确搜索view sourceprint?
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DELIMITER ;
02.
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DROP FUNCTION IF EXISTS urlencode;
04.
05.
DELIMITER |
06.
07.
CREATE FUNCTION urlencode (s VARCHAR(4096)) RETURNS VARCHAR(4096)08.
DETERMINISTIC
09.
CONTAINS SQL
10.
BEGIN
11.
DECLARE c VARCHAR(4096) DEFAULT '';
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DECLARE pointer INT DEFAULT 1;
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DECLARE s2 VARCHAR(4096) DEFAULT '';
14.
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IF ISNULL(s) THEN
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RETURN NULL;
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ELSE
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SET s2 = '';
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WHILE pointer = length(s) DO
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SET c = MID(s,pointer,1);
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IF c = ' ' THEN
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SET c = ' ';
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ELSEIF NOT (ASCII(c) BETWEEN 48 AND 57 OR24.
ASCII(c) BETWEEN 65 AND 90 OR
25.
ASCII(c) BETWEEN 97 AND 122) THEN
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SET c = concat("%",LPAD(CONV(ASCII(c),10,16),2,0));27.
END IF;
28.
SET s2 = CONCAT(s2,c);
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SET pointer = pointer1;
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END while;
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END IF;
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RETURN s2;
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END;
34.
|
35.
DELIMITER ;
view sourceprint?
01.
DROP FUNCTION IF EXISTS urldecode;
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03.
DELIMITER |
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CREATE FUNCTION urldecode (s VARCHAR(4096)) RETURNS VARCHAR(4096)06.
DETERMINISTIC
07.
CONTAINS SQL
08.
BEGIN
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DECLARE c VARCHAR(4096) DEFAULT '';
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DECLARE pointer INT DEFAULT 1;
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DECLARE h CHAR(2);
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DECLARE h1 CHAR(1);
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DECLARE h2 CHAR(1);
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DECLARE s2 VARCHAR(4096) DEFAULT '';
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IF ISNULL(s) THEN
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RETURN NULL;
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ELSE
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SET s2 = '';
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WHILE pointer = LENGTH(s) DO
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SET c = MID(s,pointer,1);
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IF c = ' ' THEN
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SET c = ' ';
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ELSEIF c = '%' AND pointer2 = LENGTH(s) THEN25.
SET h1 = LOWER(MID(s,pointer 1,1));
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SET h2 = LOWER(MID(s,pointer 2,1));
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IF (h1 BETWEEN '0' AND '9' OR h1 BETWEEN 'a' AND 'f')28.
AND
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(h2 BETWEEN '0' AND '9' OR h2 BETWEEN 'a' AND 'f')30.
THEN
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SET h = CONCAT(h1,h2);
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SET pointer = pointer2;
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SET c = CHAR(CONV(h,16,10));
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END IF;
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END IF;
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SET s2 = CONCAT(s2,c);
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SET pointer = pointer1;
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END while;
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END IF;
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RETURN s2;
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END;
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|
44.
45.
DELIMITER ;
当一个字符串经过多次 urlencode 处理之后mysql怎么精确查找,可以使用 multiurldecode来解码mysql怎么精确查找,它将多次调用 urldecode来解码mysql怎么精确查找,直到没有需要解码mysql怎么精确查找的字符
view sourceprint?
01.
DELIMITER ;
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DROP FUNCTION IF EXISTS multiurldecode;
04.
05.
DELIMITER |
06.
07.
CREATE FUNCTION multiurldecode (s VARCHAR(4096)) RETURNS VARCHAR(4096)08.
DETERMINISTIC
09.
CONTAINS SQL
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BEGIN
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DECLARE pr VARCHAR(4096) DEFAULT '';
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IF ISNULL(s) THEN
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RETURN NULL;
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END IF;
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REPEAT
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SET pr = s;
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SELECT urldecode(s) INTO s;
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UNTIL pr = s END REPEAT;
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RETURN s;
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END;
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|
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24.
DELIMITER ;
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