shell - shell中的错误命令

Question

我在 shell 存档中有这个命令：

sh -c $POSTGRESbin'psql -U '$POSTGRESuser' -h localhost -d '$POSTGRESdb' -c "select preview from '$fildCatalog' where preview <>'nodata' and id_registro in (select distinct(id_record) from e3_article_items where id_catalog=2101 and id_article in (select id_article from document_articles where id_document in(select distinct(id_document) from p3_logical_pages where id_logical_page in (select id_logical_page from p3_flatplan_pages where id_edition=1536 and id_logical_page is not null order by cast(pagenumber as numeric)))));"' > $queryFolder$highFile"_"$previewFile;

但在 <>'nodata' 中出现错误，我不知道如何解决它。错误是：

ERROR:  column "nodata" does not exist
LINE 1: select preview from XT_FIJOS where preview <>nodata and id_r...

有谁能够帮我 ？

谢谢 ！！^

Answer 1

这是正确的方法：

sh -c $POSTGRESbin'psql -U '$POSTGRESuser' -h localhost -d '$POSTGRESdb' -c "select preview from '$fildCatalog' where preview <>'\'nodata\'' and id_registro in (select distinct(id_record) from e3_article_items where id_catalog=2101 and id_article in (select id_article from document_articles where id_document in(select distinct(id_document) from p3_logical_pages where id_logical_page in (select id_logical_page from p3_flatplan_pages where id_edition=1536 and id_logical_page is not null order by cast(pagenumber as numeric)))));"' > $queryFolder$previewFile"_"$fildCatalog;

谢谢你的帮助 ！！

Answer 2

问题是您正在使用'...'引用 shell 命令的部分内容，因此您不能在命令的这些部分中使用它们。因此，您的 SQL 查询包含nodata而不是'nodata'，因此它认为nodata应该是列名。

要解决此问题，您可以在需要"..."的地方使用而不是：'...'

sh -c "${POSTGRESbin}psql -U $POSTGRESuser -h localhost -d $POSTGRESdb -c \"select preview from '$fildCatalog' where preview <> 'nodata' and id_registro in (select distinct(id_record) from e3_article_items where id_catalog=2101 and id_article in (select id_article from document_articles where id_document in(select distinct(id_document) from p3_logical_pages where id_logical_page in (select id_logical_page from p3_flatplan_pages where id_edition=1536 and id_logical_page is not null order by cast(pagenumber as numeric)))));\"" > "$queryFolder${highFile}_$previewFile";

（请注意，可以通过 using"..."包含文字，这使其更加灵活。）"\"