Question

我正在编写一个循环通过各种昆虫收集器的程序，其中一些用逗号分隔，例如。＆＃34;诉Shirey，L。Smith＆＃34;我需要为每个收集器创建一个新行。我的程序如下：

DROP PROCEDURE IF EXISTS agent_reclamation;
DELIMITER //
CREATE PROCEDURE agent_reclamation (IN VerbatimName VARCHAR(170)) 
BEGIN
DECLARE verbatimNameHandler varchar(170);
DECLARE tempAgentName varchar(170); 
SET verbatimNameHandler = VerbatimName;
    WHILE LENGTH(verbatimNameHandler) > 0 DO -- while there's more stuff left
        IF LOCATE(',', verbatimNameHandler) > 0 THEN -- and theres a comma to be found
            SET tempAgentName = SUBSTRING(verbatimNameHandler,1,LOCATE(',',verbatimNameHandler) - 1); -- set the temp variable to everything from the first character to the first comma
        ELSE
            SET tempAgentName = verbatimNameHandler; -- set the name if there are no commas
            SET verbatimNameHandler = ''; -- won't accept procedure without update --
        END IF;
            INSERT INTO agentReclamation SET tempAgentName = tempAgentName;
        /* INSERT INTO agentReclamation(tempAgentName) VALUES (tempAgentName); */ -- insert the new names into the agentReclamation table
        SET verbatimNameHandler = REPLACE(verbatimNameHandler, tempAgentName + ',', ''); -- won't accept procedure without update --
    END WHILE;
END //

DELIMITER ;

SELECT agent_reclamation(VerbatimName) FROM tempAgent WHERE VerbatimName LIKE 
'%,%';

我收到错误1442说明，无法更新表格＆＃39; tempAgent＆＃39;在存储函数/触发器中，因为它在调用此存储函数/触发器的语句中使用。我无法确定自己的位置，以便更新“临时代理”。随着程序的任何地方。

任何帮助都将不胜感激，我现在正忙着编写自己的程序。谢谢！

Answer 1

我所做的是创建两个过程，其中一个过程通过对原始过程的过程调用遍历每一行。见下文：

DROP PROCEDURE IF EXISTS agent_reclamation;
DROP PROCEDURE IF EXISTS procIteration;
DELIMITER //

CREATE PROCEDURE procIteration ()
BEGIN
DECLARE done BOOLEAN DEFAULT FALSE;
DECLARE verbatimNameHandler varchar(170);
DECLARE cur CURSOR FOR SELECT VerbatimName FROM tempAgent WHERE VerbatimName LIKE '%,%';
DECLARE CONTINUE HANDLER FOR NOT FOUND SET done := TRUE;

OPEN cur;

testLoop: LOOP
    FETCH cur INTO verbatimNameHandler;
    IF done THEN 
        LEAVE testLoop;
    END IF;
    CALL agent_reclamation(verbatimNameHandler);
END LOOP testLoop;

CLOSE cur;
END //

CREATE PROCEDURE agent_reclamation (IN VerbatimName VARCHAR(170)) 
BEGIN
DECLARE verbatimNameHandler varchar(170);
DECLARE tempAgentName varchar(170); 
SET verbatimNameHandler = VerbatimName;
    WHILE LENGTH(verbatimNameHandler) > 0 DO -- while there's more stuff left
        IF LOCATE(',', verbatimNameHandler) > 0 THEN -- and theres a comma to be found
            SET tempAgentName = SUBSTRING(verbatimNameHandler,1,LOCATE(',',verbatimNameHandler) - 1); -- set the temp variable to everything from the first character to the first comma
        ELSE
            SET tempAgentName = verbatimNameHandler; -- set the name if there are no commas
            SET verbatimNameHandler = ''; -- won't accept procedure without update --
        END IF;
        -- INSERT INTO agentReclamation SET tempAgentName = tempAgentName;
        INSERT INTO agentReclamation(tempAgentName) VALUES (tempAgentName);  -- insert the new names into the agentReclamation table
        SET verbatimNameHandler = REPLACE(verbatimNameHandler, CONCAT(tempAgentName, ','), ''); -- won't accept procedure without update --
    END WHILE;
END //

DELIMITER ;

CALL procIteration();

这会产生预期的结果。

MySQL错误1442：无法更新表，但表没有被引用？

1 个答案: