mysql怎么精确查找 mysql如何查找数据
mysql url encode编码后怎么精确搜索
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DELIMITER ;
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DROP FUNCTION IF EXISTS urlencode;
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DELIMITER |
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CREATE FUNCTION urlencode (s VARCHAR(4096)) RETURNS VARCHAR(4096)08.
DETERMINISTIC
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CONTAINS SQL
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BEGIN
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DECLARE c VARCHAR(4096) DEFAULT '';
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DECLARE pointer INT DEFAULT 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 NOT (ASCII(c) BETWEEN 48 AND 57 OR24.
ASCII(c) BETWEEN 65 AND 90 OR
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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;
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SET s2 = CONCAT(s2,c);
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SET pointer = pointer + 1;
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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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|
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DELIMITER ;
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DROP FUNCTION IF EXISTS urldecode;
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DELIMITER |
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CREATE FUNCTION urldecode (s VARCHAR(4096)) RETURNS VARCHAR(4096)06.
DETERMINISTIC
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CONTAINS SQL
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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 pointer + 2 = 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 = pointer + 2;
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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 = pointer + 1;
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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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|
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DELIMITER ;
当一个字符串经过多次 urlencode 处理之后，可以使用 multiurldecode来解码，它将多次调用 urldecode来解码，直到没有需要解码的字符
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DELIMITER ;
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DROP FUNCTION IF EXISTS multiurldecode;
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DELIMITER |
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CREATE FUNCTION multiurldecode (s VARCHAR(4096)) RETURNS VARCHAR(4096)08.
DETERMINISTIC
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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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DELIMITER ;
mysql如何精确查找关键词，只提取最近5分钟内记录？
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
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