链接oracle出现：“表或视图不存在”异常
连接Oracle数据库的函数代码如下：

Java code

public static final String DRIVER="oracle.jdbc.driver.OracleDriver";
     public static final String URL="jdbc:oracle:thin:@192.168.1.100:1521:gwl";
     public static final String DBNAME="order1";
     public static final String DBPWD="bdqn";
     
     public Connection getConnection(){
         Connection conn=null;
         try {
            Class.forName(DRIVER);
            conn=DriverManager.getConnection(URL,DBNAME,DBPWD);
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return conn;
     }

这段代码返回的conn是不为空的，貌似没问题。下面是我查询一张表的所有内容的代码：

Java code

public void selectAll(){
         Connection conn=getConnection();
         PreparedStatement pstmt = null;
         ResultSet rs=null;
        try {
            pstmt = conn.prepareStatement("select * from orderitem");
            rs=pstmt.executeQuery();
            while(rs.next()){
                System.out.print(rs.getInt(1));
                System.out.print(rs.getString(2));
                System.out.print(rs.getFloat(3));
                System.out.println(rs.getInt(4));
            }
        } catch (SQLException e) {
            e.printStackTrace();
        }finally{
            closeAll(conn,pstmt,rs);
        }
     }

测试的main函数如下：

Java code

public static void main(String[] args){
         BookOrder bo=new BookOrder();
         bo.selectAll();
     }

报告异常如下：

java.sql.SQLException: ORA-00942: 表或视图不存在

at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:112)
at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:331)
at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:288)
at oracle.jdbc.driver.T4C8Oall.receive(T4C8Oall.java:745)
at oracle.jdbc.driver.T4CPreparedStatement.doOall8(T4CPreparedStatement.java:216)
at oracle.jdbc.driver.T4CPreparedStatement.executeForDescribe(T4CPreparedStatement.java:810)
at oracle.jdbc.driver.OracleStatement.executeMaybeDescribe(OracleStatement.java:1039)
at oracle.jdbc.driver.T4CPreparedStatement.executeMaybeDescribe(T4CPreparedStatement.java:850)
at oracle.jdbc.driver.OracleStatement.doExecuteWithTimeout(OracleStatement.java:1134)
at oracle.jdbc.driver.OraclePreparedStatement.executeInternal(OraclePreparedStatement.java:3339)
at oracle.jdbc.driver.OraclePreparedStatement.executeQuery(OraclePreparedStatement.java:3384)
at com.gwl.all.BookOrder.selectAll(BookOrder.java:64)
at com.gwl.all.BookOrder.main(BookOrder.java:55)

让我疑惑的是oracle中明明存在book这张表，用户名和密码也是正确的，链接函数也正常不知为何，求解！谢谢！

------解决方案--------------------
1 数据库中没有orderitem
2 public static final String URL="jdbc:oracle:thin:@192.168.1.100:1521:gwl";
public static final String DBNAME="order1";
public static final String DBPWD="bdqn";
这连接的不是你的机器 或者用户order1下没有orderitem表
------解决方案--------------------
public void selectAll(){ <