sql - 不能使用方法 void java.sql.CallableStatement.setObject(String parameterName, Object x, int targetSqlType)

Question

这是我的程序代码： 规范：

create or replace PACKAGE PKG_NALD AS 
    PROCEDURE PROC_KETQUA(res OUT SYS_REFCURSOR ,maMH STRING); 
END PKG_NALD;

身体：

create or replace PACKAGE BODY PKG_NALD AS

  PROCEDURE PROC_KETQUA(res OUT SYS_REFCURSOR ,maMH STRING) AS
  BEGIN
       OPEN res FOR
     select MA_MH as maMH123, TEN_MH as tenMH, TIN_CHI as tinChi, KHOA as khoa from nald_mon_hoc where upper(ma_mh) = upper(maMH);
  END PROC_KETQUA;

END PKG_NALD;

这是我的代码，以便通过 CallableStatement 调用过程：

String sqlQuery = "call PKG_NALD.PROC_KETQUA(?, :maMH)";
Connection connection = ((SessionImpl)session).connection();
CallableStatement callable = connection.prepareCall(sqlQuery);
callable.setObject (2, "COSC1310", Types.VARCHAR); // This method belongs to java.sql.PreparedStatement
callable.registerOutParameter(1, OracleTypes.CURSOR);
callable.execute();

程序可以正常运行。但是，如果我将 callable.setObject (2, "COSC1310", Types.VARCHAR) 替换为

callable.setObject("maMH", "COSC1310", Types.VARCHAR); // This method belongs to java.sql.CallableStatement

我收到错误：

Exception in thread "main" java.sql.SQLException: The number of parameter names does not match the number of registered praremeters
    at oracle.jdbc.driver.OracleSql.setNamedParameters(OracleSql.java:196)
    at oracle.jdbc.driver.OracleCallableStatement.execute(OracleCallableStatement.java:4708)
    at oracle.jdbc.driver.OraclePreparedStatementWrapper.execute(OraclePreparedStatementWrapper.java:1374)
    at com.mkyong.util.QueryUtil.getListFromPackage(QueryUtil.java:71)
    at com.mkyong.App.main(App.java:35)

尽管这里有文件，但还是出了点问题。我应该怎么办 ？

Answer 1

尝试改变这个

String sqlQuery = "call PKG_NALD.PROC_KETQUA(?, :maMH)";

对此

String sqlQuery = "call PKG_NALD.PROC_KETQUA(?, ?)";