参数编号1不是OUT参数

Question

Trying to execute a stored procedure using JDBC, I can't seem to get past this error,

java.sql.SQLException: Parameter number 1 is not an OUT parameter

public static void SP1() throws SQLException, IOException {

    try {

        stmt = conn.createStatement();
        stmt.executeUpdate("DROP PROCEDURE IF EXISTS sp1;");

        stmt.executeUpdate("CREATE PROCEDURE sp1(OUT cName VARCHAR(20))"
                + "SELECT CuratorName FROM curator "
                + "WHERE CuratorPhone = \"90394857\" INTO cName;");

        conn.commit();

        System.out.println("Sp1 created");

        CallableStatement cs3 = conn.prepareCall("{call sp1(?)}");
        cs3.registerOutParameter(1, java.sql.Types.VARCHAR);
        cs3.execute();
        String result = cs3.getString("cName");
        System.out.println("Result from sp1:" + result);

    } catch (Exception e) {

        System.out.println(e);
    }

}

Answer 1

If your Stored Procedure definition contains an IN parameter looking at the code you have shared, then the Call statement should look like this

 CallableStatement cs3 = conn.prepareCall("{call sp1(?)}");
    cs3.setString(1, java.sql.Types.VARCHAR);

The parameter needs to be set as an IN Parameter.

If your Stored Procedure definition contains an OUT Parameter then your call statement needs to be modified.

CallableStatement cs3 = conn.prepareCall("{? = call sp1()}");
        cs3.registerOutParameter(1, java.sql.Types.VARCHAR);

In any case, share your procedure definition, that would make it clearer.