从 Java 调用 PL/SQL 函数时出现“SQLException: ORA-06550”

我想使用 Java 从数据库检索数据并显示它，因此我创建了这个 PL/SQL 函数，它返回一个游标：

create or replace function std_getInfoFunc return types.cursortype 
as 
    my_cursor    types.cursorType; 
begin 
    open my_cursor FOR
    SELECT s.FirstName, s.LastName, s.Address, s.City, s.Province
        , s.PostalCode, c.CourseName
    FROM Students s, Courses c, StudentAndCourses cs
    Where s.StudentID = cs.StudentID
        AND c.CourseID = cs.CourseID;
    Return my_cursor;
end; 

在我的 Java 代码中，我按如下方式调用该函数：

try{
    CallableStatement cst=connection.prepareCall("{? = call std_getInfoFunc}");
    cst.registerOutParameter(1, oracle.jdbc.OracleTypes.CURSOR);
    cst.execute();

    res=(ResultSet) cst.getObject(1);

    while(res.next()){
        System.out.println(res.getString(1));
    }
}
catch(SQLException e){
    e.printStackTrace();
}
finally{
    res.close();
    cst.close();
    conn.close();
}

该代码产生以下异常：

 run:
  java.sql.SQLException: ORA-06550: line 1, column 13:
   PLS-00905: object SAS.STD_GETINFOFUNC is invalid
  ORA-06550: line 1, column 7:
  PL/SQL: Statement ignored

at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:439)
at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:395)
at oracle.jdbc.driver.T4C8Oall.processError(T4C8Oall.java:802)
at oracle.jdbc.driver.T4CTTIfun.receive(T4CTTIfun.java:436)
at oracle.jdbc.driver.T4CTTIfun.doRPC(T4CTTIfun.java:186)
at oracle.jdbc.driver.T4C8Oall.doOALL(T4C8Oall.java:521)
at oracle.jdbc.driver.T4CCallableStatement.doOall8(T4CCallableStatement.java:202)
at        
  oracle.jdbc.driver.T4CCallableStatement.executeForRows(T4CCallableStatement.java:1005)
at oracle.jdbc.driver.OracleStatement.doExecuteWithTimeout(OracleStatement.java:1307)
at oracle.jdbc.driver.OraclePreparedStatement.executeInternal(OraclePreparedStatement.java:3449)
at oracle.jdbc.driver.OraclePreparedStatement.execute(OraclePreparedStatement.java:3550)
at oracle.jdbc.driver.OracleCallableStatement.execute(OracleCallableStatement.java:4710)
at oracle.jdbc.driver.OraclePreparedStatementWrapper.execute(OraclePreparedStatementWrapper.java:1374)
at DBControler.viewStdInfo(DBControler.java:95)
at Test_02.main(Test_02.java:18)

Why?

错误的可能原因是：（在代码片段 - 函数中）

1. 包“types”不存在。

  create or replace package types 
    as 
        type cursorType is ref cursor; 
    end; 
    /

2 无效的 SQL select 语句（创建函数后表或列已被删除或更改）。

你需要写一个new function with simplesql语句并运行在Sql提示并与Java code.