java callable语句帮助使用包过程

Question

目前，我在包下有一个程序，当某些人在网页上选择 user_id 时，它会获取 user_name ，但现在我想通过将 ssn 添加到页面来更改格式，以便当某些主体选择 user_id 时，它会在网页文本框中加载用户名和 ssn ..我我正在使用可调用语句来加载数据..我可以在此处更改什么来获取用户名和 ssn

    PROCEDURE get_User_name
  (
    return_code_out OUT VARCHAR2,
    return_msg_out OUT VARCHAR2,
    user_id_in IN user.user_id%TYPE,
    user_name_out OUT user.user_name%TYPE
  )
  IS

  BEGIN


    return_code_out := '0000';
    return_msg_out := 'OK';

    SELECT c.user_name INTO user_name_out 
      FROM user c
     WHERE c.user_id = user_in;

 END get_user_name;

，这是我的加载函数

    public String load() {

        String retMsg = null;
        DbUtil db = null;
        java.sql.CallableStatement cstmt = null;

            try {
            db = new DbUtil();
            cstmt = db.prepareCall("{ call sample.PACK_USER.get_user_name(?, ?, ?, ?) }");

            cstmt.registerOutParameter(1,OracleTypes.VARCHAR);
            cstmt.registerOutParameter(2,OracleTypes.VARCHAR);
            cstmt.setString(3,this.getuserid());
            cstmt.registerOutParameter(4,OracleTypes.VARCHAR);

                cstmt.execute();

            if (cstmt.getString(1).equals(Constants.dbSuccess))
                myLog.log(myLog.INFORMATION, "UserBean.load() DB return code and message = " + retMsg);
            else {
                retMsg =  cstmt.getString(1) + " - " + cstmt.getString(2);
                myLog.log(myLog.ERROR, "UserBean.load() DB return code and message = " + retMsg);
            }

            this.setUserName(cstmt.getString(4));
return retMsg;
    }

Answer 1

因此，这就是按照 Rajesh 建议更改您的过程（尽管它确实取决于您使用的数据库服务器）：

PROCEDURE get_User_name
( user_id_in IN user.user_id%TYPE, 
  user_name_out OUT user.user_name%TYPE,
  user_ssn_out  out user.ssn_type%TYPE ) IS

BEGIN

SELECT c.user_name, c.ssn 
  INTO user_name_out, ssn_out
  FROM user c
  WHERE c.user_id = user_in;

END get_user_name;

并按如下方式更改 Java 代码：

        cstmt = db.prepareCall("{ call sample.PACK_USER.get_user_name(?, ?, ?) }");

        cstmt.setString(1,this.getuserid());
        cstmt.registerOutParameter(2,OracleTypes.VARCHAR);
        cstmt.registerOutParameter(3,OracleTypes.VARCHAR);
        cstmt.execute();

        String userName = cstmt.getString(2);
        String ssnType = cstmt.getString(3);

您现有的错误代码将永远不会工作 - 您必须通过在某处捕获 SQLException 来处理错误。

Answer 2

该过程需要更改为...

PROCEDURE get_User_name

( user_id_in IN user.user_id%TYPE, 
  user_name_out OUT user.user_name%TYPE,
  user_ssn_out  out user.ssn_type%TYPE ) IS

BEGIN

---return_code_out := '0000';  /*catch sql exception in java instead..*/
---return_msg_out := 'OK';     /*catch sql exception in java instead..*/

SELECT c.user_name, c.ssn 
  INTO user_name_out, ssn_out
  FROM user c
 WHERE c.user_id = user_in;

END get_user_name;

从您的代码来看，您似乎想从过程中返回错误代码和错误消息。相反，请使用 try catch 块来捕获 Java 中的 sqlException 并采取必要的操作。