org.postgresql.util.PSQLException：错误：关系“table_name”不存在

Question

Java code

Above is my Java JDBC Code

List of database

and these are my list of database

Even though my relation name is not "railway" but it is railway (without qoutes) it is giving me error as:

org.postgresql.util.PSQLException:ERROR: relation "railway" does not exist

  Position: 16

also what is this Position means?

Answer 1

The SELECT * FROM x is a table query. When you connect to the database you connect to a database within the database software, and that database has tables which the query will be applied to.

Without knowing what your tables are called I can't suggest what it should look like instead, except for that x should be exchanged for the [schema].[tablename]

You find the tables in the db by doing:

\c railway  -- Connect to the database
\dt         -- List database tables

in the database console.