查询postgres select不返回结果？

Question

I am developing a java app, and I use resultset. I write this query, it works and I get the results

SELECT * 
FROM BD 
WHERE 
    CAST(parent_id AS integer) = " + (Integer.parseInt(arrHeading[0])) + " 
    AND CAST(section AS double precision) = " + Double.parseDouble(arrHeading[1]) + "";

arrHeading is type string , but when I write the query below it does not return any results. cas is type character varying(12) . I am having trouble because it's a character, and I dont know why I am not getting any result. I tried with the quotes but still does not work. Any ideas?

SELECT * 
FROM BD 
WHERE 
    CAST(parent_id AS integer) = " + (Integer.parseInt(arrHeading[0])) + " 
    AND CAST(section AS double precision) = " + Double.parseDouble(arrHeading[1]) + "
    AND cas = '" + arrHeading[2] + "'";

Answer 1

我建议先将arrHeading [2]替换为查询中的实际值，即硬编码cas =“'your valiue'”，然后查看查询是否返回任何结果