为什么在MATLAB中创建SQL查询时出现此错误

为什么在MATLAB中创建SQL查询时出现此错误

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问题描述

我正在尝试将一些数据从MATLAB导出到数据库.我通过ODBC使用PostgreSQL数据库,如下所示.首先,我创建连接:

I'm trying to export some data from MATLAB to a database. I use a PostgreSQL database via ODBC as follows. First, I create the connection:

dbConn = database('PostgreSQL30', username,password);

如果我尝试手动执行一些测试插入,则一切看起来都很好:

If I try to execute some test insertion manually, everything looks fine:

exec( dbConn, 'insert into test(std) values(2.2)')

当我尝试动态生成一些简短查询时,一切仍然看起来不错:

When I try to generate some short query dynamically, everything still looks fine:

q = sprintf('insert into test(std) values(%2.2f)', 12.345);
res = exec(dbConn, q);

但是当我尝试生成一些包含字符串的查询时,出现错误:

But when I try to generate some query containing strings, I get an error:

>> q = sprintf('insert into test(name) values("%s")', 'xxx')

q =

insert into test(name) values("xxx")

>> res = exec(dbConn, q);
>> res.Message
ans =

ERROR: column "xxx" does not exist;
Error while executing the query

如果我使用"%s"格式或普通的%s,没有任何区别.问题出在哪儿?

There is no difference if I use "%s" format or plain %s. Where is the problem?

编辑

好的,我使用了错误的引号.当我使用时:

OK, I used the wrong quotation marks. When I use:

q = sprintf('insert into test(name) values(''%s'')', 'xxx')

一切正常.因此,可以关闭/删除问题.抱歉打扰你了.

everything is OK. So the question can be closed/deleted. Sorry to bother you.

推荐答案

您是否尝试过使用单引号?

Have you tried using single quotes?

>> q = sprintf('insert into test(name) values(''%s'')', 'xxx')

q =

insert into test(name) values('xxx')

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09-05 19:55