使用Java调用PL / SQL函数时，类型或参数数量错误。 PLS-00306错误

Question

try{
        Statement stmt = conn.createStatement();
            stmt.execute("CREATE OR REPLACE FUNCTION log(p_user IN VARCHAR2, p_password IN VARCHAR2, p_name IN VARCHAR2 ) "
                    + "RETURN number "
                    + "IS "
                    + "flag login%ROWTYPE; "
                    + "temp number; "
                    + "BEGIN "
                    + "select username into flag "
                    + "from login "
                    + "where username=p_user and password=p_password and name=p_name; "
                    + "IF (sql%found) THEN temp:= 1; "
                    + "ELSE temp:= 0; "
                    + "END IF; "
                    + "return temp; "
                    + "END; ");

            stmt.close();

            String value = Combo_Name.getSelectedItem().toString();

            String sql= "begin "
                    + "?:=log(?,?,?); "
                    + "end; ";

            CallableStatement cstmt = conn.prepareCall (sql);

            cstmt.registerOutParameter (1, OracleTypes.NUMBER);
            cstmt.setString(2, user_id.getText());
            cstmt.setString (3, password.getText()); 
            cstmt.setString(4, value);

            cstmt.execute();

            int check =cstmt.getInt(1);

             if(check==1)
            {
                JOptionPane.showMessageDialog(null, "Login Successful");
            }
            else
            {
                JOptionPane.showMessageDialog(null, "Invalid Username or Password");
            }

    }catch(Exception e){
        JOptionPane.showMessageDialog(null, e);
    }
}        

A pls-00306 error is shown when I am calling the function. Every time it shows wrong type or numbers of parameters. Please help me to resolve the errors. The variable value is used to take input from the combo box.

Answer 1

You are clashing with a built-in function LOG(n2,n1) that returns the logarithm , base n2 , of n1 .

Use another name.