How to Fix PostgreSQL's 'Column does not exist' Error in Java?

Resolving "Column does not exist" Error in Postgresql

Despite establishing a connection between PostgreSQL and Java, you encounter an error when attempting to perform a delete operation, with the message "column 'mac' does not exist." This issue, despite the existence of the MAC column in the table, stems from the case-sensitivity of Postgresql entity names.

To address this, enclose column names with double quotes (" ") when they contain uppercase letters. In your case, modify the query as follows:

String stm = "DELETE FROM hostdetails WHERE \"MAC\" = 'kzhdf'";

Additionally, to enhance security and prevent SQL injection vulnerabilities, utilize prepared statements and set values through parameters:

con = DriverManager.getConnection(url, user, password);
String stm = "DELETE FROM hostdetails WHERE \"MAC\" = ?";
pst = con.prepareStatement(stm);
pst.setString(1, "kzhdf");
pst.executeUpdate();

This approach ensures a precise match between the column name and value, avoiding the "column does not exist" error and bolstering the security of your code.

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