即使行不存在，pl-sql的java executeUpdate也总是返回1

Question

我有以下java代码，其中executeUpdate（）的输出是在int中捕获的，值始终为1.对于输入值，DB中没有行但它仍然返回1.为什么？我错过了什么吗？

    /*******************Java code *************/


    /**** Code to get connection above ***/
    CallableStatement oraCallStmt   = null;

    try {
        oraCallStmt =   connection.prepareCall(
                "{ call XXXXX.UPDATEMEMBERNUMBER(?,?)}"
            );
    } catch (SQLException e1) {
        // TODO Auto-generated catch block
        e1.printStackTrace();
        return ;
    }
        try {
            //Reading a comma delimited file to get two column values
            //One into the where clause and one into the update clause
            while ((str = in.readLine()) != null) {

                String[] ar = str.split(",");

                oraCallStmt.setString(1,ar[0].trim());
                oraCallStmt.setString(2,ar[1].trim());

                int output = oraCallStmt.executeUpdate();

                //The output returns 1 always even if the row doesn't exist
                System.out.println(str +'-'+output);

                //Writing the result to another file
                bw.write(str +'-'+output);
                bw.newLine() ;
                bw.flush();
            }
            bw.close();
        }catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }



    /************pl-sql package*******************/

    PROCEDURE UpdateMemberNumber(CUSTID_INP IN VARCHAR,
                         MEM_NUM_INP IN VARCHAR) IS
    BEGIN
       UPDATE GENESIS.CUSTOMER
       SET MEMBER_NUMBER = MEM_NUM_INP
       WHERE CUSTOMER_ID = CUSTID_INP ;

    END UpdateMemberNumber ;