Mysql-如何在存储过程中拆分文本变量
我有一个Mysql-如何在存储过程中拆分文本变量,mysql,stored-procedures,Mysql,Stored Procedures,我有一个MySQL变量,如下所示 DECLARE str TEXT DEFAULT '2014-01-02 13:00:00|2014-02-04 12:59:59@0@2014-02-04 13:00:00|2014-03-04 12:59:59@0@2014-03-04 13:00:00|2014-04-02 13:59:59@0@2014-04-02 14:00:00|2014-05-02 14:59:59@0@2014-05-02 15:00:00|2014-06-03 14:59:59
MySQL
变量,如下所示
DECLARE str TEXT DEFAULT '2014-01-02 13:00:00|2014-02-04 12:59:59@0@2014-02-04 13:00:00|2014-03-04 12:59:59@0@2014-03-04 13:00:00|2014-04-02 13:59:59@0@2014-04-02 14:00:00|2014-05-02 14:59:59@0@2014-05-02 15:00:00|2014-06-03 14:59:59';
我想首先使用分隔符@0@
来断开整个字符串,然后从结果中使用分隔符|
来断开字符串
我已经尝试了MySQLsplit\u str
功能,但我无法做到这一点。它给我的错误
split\u str不存在
请建议其他方法。最后,我使用以下步骤解决了问题 我能够使用临时表和程序解决它。我不再为此使用mysql变量。我们可以按如下方式调用该过程
CALL SplitString('2014-01-02 13:00:00|2014-02-04 12:59:59@0@2014-02-04 13:00:00|2014-03-04 12:59:59@0@2014-03-04 13:00:00|2014-04-02 13:59:59@0@2014-04-02 14:00:00|2014-05-02 14:59:59@0@2014-05-02 15:00:00|2014-06-03 14:59:59', '@0@', 'tblindex');
DELIMITER $$
DROP PROCEDURE IF EXISTS `SplitString`$$
CREATE PROCEDURE `SplitString`( IN input TEXT,IN delm VARCHAR(10),tblnm varchar(50))
BEGIN
DECLARE cur_position INT DEFAULT 1 ;
DECLARE remainder TEXT;
DECLARE cur_string VARCHAR(1000);
DECLARE delm_length TINYINT UNSIGNED;
set @sql_drop = concat("DROP TABLE IF EXISTS ",tblnm);
prepare st_drop from @sql_drop;
execute st_drop;
set @sql_create = concat("CREATE TEMPORARY TABLE ",tblnm," (value VARCHAR(2000) NOT NULL ) ENGINE=MEMORY;");
prepare st_create from @sql_create;
execute st_create;
SET remainder = input;
SET delm_length = CHAR_LENGTH(delm);
WHILE CHAR_LENGTH(remainder) > 0 AND cur_position > 0
DO
SET cur_position = INSTR(remainder, delm);
IF cur_position = 0 THEN
SET cur_string = remainder;
ELSE
SET cur_string = LEFT(remainder, cur_position - 1);
END IF;
-- select cur_string;
IF TRIM(cur_string) != '' THEN
set @sql_insert = concat("INSERT INTO ",tblnm," VALUES ('",cur_string,"');");
prepare st_insert from @sql_insert;
execute st_insert;
END IF;
SET remainder = SUBSTRING(remainder, cur_position + delm_length);
END WHILE;
END$$
DELIMITER ;
这里tblindex是我使用过的临时表
我的程序如下
CALL SplitString('2014-01-02 13:00:00|2014-02-04 12:59:59@0@2014-02-04 13:00:00|2014-03-04 12:59:59@0@2014-03-04 13:00:00|2014-04-02 13:59:59@0@2014-04-02 14:00:00|2014-05-02 14:59:59@0@2014-05-02 15:00:00|2014-06-03 14:59:59', '@0@', 'tblindex');
DELIMITER $$
DROP PROCEDURE IF EXISTS `SplitString`$$
CREATE PROCEDURE `SplitString`( IN input TEXT,IN delm VARCHAR(10),tblnm varchar(50))
BEGIN
DECLARE cur_position INT DEFAULT 1 ;
DECLARE remainder TEXT;
DECLARE cur_string VARCHAR(1000);
DECLARE delm_length TINYINT UNSIGNED;
set @sql_drop = concat("DROP TABLE IF EXISTS ",tblnm);
prepare st_drop from @sql_drop;
execute st_drop;
set @sql_create = concat("CREATE TEMPORARY TABLE ",tblnm," (value VARCHAR(2000) NOT NULL ) ENGINE=MEMORY;");
prepare st_create from @sql_create;
execute st_create;
SET remainder = input;
SET delm_length = CHAR_LENGTH(delm);
WHILE CHAR_LENGTH(remainder) > 0 AND cur_position > 0
DO
SET cur_position = INSTR(remainder, delm);
IF cur_position = 0 THEN
SET cur_string = remainder;
ELSE
SET cur_string = LEFT(remainder, cur_position - 1);
END IF;
-- select cur_string;
IF TRIM(cur_string) != '' THEN
set @sql_insert = concat("INSERT INTO ",tblnm," VALUES ('",cur_string,"');");
prepare st_insert from @sql_insert;
execute st_insert;
END IF;
SET remainder = SUBSTRING(remainder, cur_position + delm_length);
END WHILE;
END$$
DELIMITER ;
你看到了吗?我不知道常见的模式…让我先检查一下。