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我试图构建一个mysql存储过程，但似乎有不同的错误，我只是试图从存储过程中运行一个准备好的语句来实现在表中动态插入一些数据。

谁能检查并告诉我我的错误在哪里？

谢谢

    DELIMITER $$
    CREATE PROCEDURE insert_tracking(IN deviceid VARCHAR(15),IN timing timestamp,IN valid tinyint(1),IN latitude double,IN longitude double,IN speed double,IN course double,IN power double,IN comando varchar(45))
    BEGIN
        DECLARE query VARCHAR(150);
        SET query = "INSERT INTO tracking_? (device_id,time,valid,latitude,longitude,speed,course,power,command) VALUES (?,?,?,?,?,?,?,?,?)";
        PREPARE stmt FROM query;
        EXECUTE stmt USING deviceid,deviceid,timing,valid,latitude,longitude,speed,course,power,comando;
    END $$

我也尝试过这种连接，但它不起作用。

    DELIMITER $$
    CREATE PROCEDURE insert_tracking(IN deviceid VARCHAR(15),IN timing timestamp,IN valid tinyint(1),IN latitude double,IN longitude double,IN speed double,IN course double,IN power double,IN comando varchar(45))
    BEGIN
        DECLARE query VARCHAR(200);
        SET query = CONCAT('INSERT INTO tracking_',deviceid,' (device_id,time,valid,latitude,longitude,speed,course,power,command) VALUES (?,?,?,?,?,?,?,?,?)');
        PREPARE stmt FROM query;
        EXECUTE stmt USING deviceid,timing,valid,latitude,longitude,speed,course,power,comando;
        DEALLOCATE PREPARE stmt;
    END $$

编辑后我有了这个，我测试了 concat 语句，它们分别工作，但准备好的语句一直有问题，它不起作用。

    DELIMITER $$
    CREATE PROCEDURE insert_tracking(IN deviceid VARCHAR(15),IN timing timestamp,IN valid tinyint(1),IN latitude double,IN longitude double,IN speed double,IN course double,IN power double,IN comando varchar(45))
    BEGIN
        SET @deviceid = deviceid;
        SET @nsert = CONCAT('INSERT INTO tracking_',@deviceid); 
        SET @query = CONCAT(@nsert,' (device_id,time,valid,latitude,longitude,speed,course,power,command) VALUES ("?","?","?","?","?","?","?","?","?")');
        SET @fquery = @query;
        PREPARE stmt FROM @fquery;
        EXECUTE stmt USING deviceid,timing,valid,latitude,longitude,speed,course,power,comando;
    END $$
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1 回答 1

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我相信这是因为表名和列名不能被准备好的语句中的参数替换。尝试获取完整的表名并测试是否要验证。

代码取自（http://dev.af83.com/2007/05/30/use-parameters-for-field-and-table-names-in-a-mysql-prepare-statement-to-create-truly- dynamic-sql.html ) 归功于作者

该函数可以允许动态表名和列名

DELIMITER //
DROP FUNCTION  IF EXISTS substrCount//
CREATE FUNCTION substrCount(x varchar(255), delim varchar(12)) returns int
return (length(x)-length(REPLACE(x, delim, '')))/length(delim);//

DROP FUNCTION  IF EXISTS charsplit//
CREATE FUNCTION charsplit(x varchar(255), delim varchar(12), pos int) returns varchar(255)
return replace(substring(substring_index(x, delim, pos), length(substring_index(x, delim, pos - 1)) + 1), delim, '');//

DROP FUNCTION  IF EXISTS replacefirst//
CREATE FUNCTION replacefirst(haystack varchar(255), needle varchar(255),replacestr varchar(255)) returns varchar(255)
BEGIN
    IF LOCATE(needle,haystack)>0 THEN
        SET @replaced=concat(left(haystack,LOCATE(needle,haystack)-LENGTH(needle)),replacestr,right(haystack,LENGTH(haystack)-LOCATE(needle,haystack)));
    ELSE
        SET @replaced=haystack;
    END IF;
    RETURN @replaced;
END;//

DROP FUNCTION  IF EXISTS properprepare//
CREATE FUNCTION properprepare(template varchar(255), args varchar(255)) returns varchar(255)
BEGIN
 SET @i=0;
 SET @numargs = substrCount(args,',');
  WHILE @i <= @numargs DO
      SET @i= @i+ 1;
      SET template=replacefirst(template,'?',charsplit(args,',',@i));
  END WHILE;
RETURN template;
END;//

DELIMITER ;
于 2013-08-20T02:36:52.120 回答