如何在使用动态where子句时在mysql中使用execute语句

Question

Below is my store procedure .please help........



BEGIN



DECLARE selectQuery VARCHAR(2000);
declare finalquery varchar(2000);
declare stmt3 varchar(2000);

SET selectQuery = 'SELECT tbl_property.intId, strAddressLine1,(select strItemName from tbl_lk_item where intId=tbl_property.intPropertyCountyTypeId) as strCountyName ,(select strItemName from tbl_lk_item where intId=tbl_property.intPropertyCountryTypeId) as strCountryName ,strpostCode,(tbl_pro_adver_matchcriteria.floatAskingPrice),tbl_pro_adver_matchcriteria.intBedrooms
FROM tbl_property LEFT OUTER JOIN tbl_pro_adver_matchcriteria on tbl_property.intId = tbl_pro_adver_matchcriteria.intPro
set finalquery =CONCAT(selectQuery,strSqlQuery,' AND tbl_property.intId=1 ');  

execute finalquery;

END

当我运行存储过程并传递参数 'where tbl_property.intId=1' 时，它使过程执行失败 1243 - 为 EXECUTE 提供了未知的准备好的语句处理程序（finalquery）

我通过 select 语句检查查询结果，它给出了正确的查询并返回结果。所以请帮助我使用 Execute 语句。

Answer 1

试试这个链接http://docs.oracle.com/javase/tutorial/jdbc/basics/storedprocedures.html，它可能对你有帮助， 开始

DECLARE selectQuery VARCHAR(2000);
declare finalquery varchar(2000);
declare stmt3 varchar(2000);

SET selectQuery = 'SELECT tbl_property.intId, strAddressLine1,(select strItemName from tbl_lk_item where intId=tbl_property.intPropertyCountyTypeId) as strCountyName ,(select strItemName from tbl_lk_item where intId=tbl_property.intPropertyCountryTypeId) as strCountryName ,strpostCode,(tbl_pro_adver_matchcriteria.floatAskingPrice),tbl_pro_adver_matchcriteria.intBedrooms
FROM tbl_property LEFT OUTER JOIN tbl_pro_adver_matchcriteria on tbl_property.intId = tbl_pro_adver_matchcriteria.intProId ';

set finalquery =CONCAT(selectQuery,strSqlQuery);  


EXECUTE finalquery;

Answer 2

动态语句必须在使用后进行准备和释放。这是一个例子。

BEGIN

SET @selectQuery = 'SELECT * from table1 where'

SET @QUERY = CONCAT(@selectQuery, ' field = 1');            
SELECT @QUERY;
PREPARE s FROM @QUERY;

EXECUTE s;
DEALLOCATE PREPARE s;

END

Answer 3

感谢您的帮助，我已经尝试过了，只需稍作修改即可工作。以下是我的存储过程：

BEGIN
DECLARE selectQuery VARCHAR(2000);
declare finalquery varchar(2000);

SET selectQuery = 'SELECT tbl_property.intId, strAddressLine1,(select strItemName from tbl_lk_item where intId=tbl_property.intPropertyCountyTypeId) as strCountyName ,(select strItemName from tbl_lk_item where intId=tbl_property.intPropertyCountryTypeId) as strCountryName ,strpostCode,(tbl_pro_adver_matchcriteria.floatAskingPrice),tbl_pro_adver_matchcriteria.intBedrooms
FROM tbl_property LEFT OUTER JOIN tbl_pro_adver_matchcriteria on tbl_property.intId = tbl_pro_adver_matchcriteria.intProId ';

set @finalquery =CONCAT(selectQuery,strSqlQuery,' AND tbl_property.intId=1 ');  

PREPARE result from @finalquery;
EXECUTE result;
DEALLOCATE PREPARE result;

END