Re: Trying to insert an array using a prepared statement.

I'm trying to insert an array into an array column, with no great success. Has anybody gotten this to work, and if so, may I inquire how?

I've tried using both text and binary arguments as described below. I'm using Postgresql 8.2.4 with the jdbc driver postgresql-8.3.604.jdbc4.jar on a Linux box.

Text attempts.

java.sql.PreparedStatement st = conn.prepareStatement("insert into vectortest(a) values(?)");
st.setString(1, "{1,2,3}");
st.execute();

which threw the exception:

org.postgresql.util.PSQLException: ERROR: column "a" is of type integer[] but expression is of type character varying

            java.sql.PreparedStatement st = conn.prepareStatement("insert into vectortest(a) values(?::integer[])");
            st.setString(1, "{1,2,3}");
            st.execute();

which threw the exception:

org.postgresql.util.PSQLException: ERROR: cannot cast type character varying to integer[]

Binary attempt:

I first queried a table containing an integer [] column to determine that the the baseTypeName was int4 and that the array was passed in the form of an array of java.lang.Integer objects.
I implemented the java.sql.Array interface (ignoring the map arguments in the getArray methods), and tried the below sequence of statements.

            java.sql.PreparedStatement st = conn.prepareStatement("insert into vectortest(a) values(?)");
            Integer []vals = new Integer[3];
            vals[0] = new Integer(1);
            vals[1] = new Integer(2);
            vals[2] = new Integer(3);
            st.setArray(1, new LinearArray(vals));
            st.execute();

which threw the exception
org.postgresql.util.PSQLException: ERROR: array value must start with "{" or dimension information

Any ideas appreciated.
Thank you.