Question

我正在尝试查询包含long-raw（）类型数据的表，该表中包含文本。我需要将此数据导出到平面文件。对于给定的ID，我看到表中有14行。我正在使用JDBC连接获取数据，并且在使用ResultSet获取数据时，在第13行获取了ArrayIndexOutOfBoundsException。不知道为什么会发生此问题。

原始长列中的数据可能很大。我怀疑它无法获取存在的所有数据。我也可能错了。在这种情况下，何时可以发生ArrayIndexOutOfBoundsException我找不到太多信息。完整的代码如下-

import java.io.*;
import java.sql.*;
import java.util.ArrayList;


public class TestMain {

    private static String URL = "jdbc:oracle:thin:@localhost:8080:xe";
    private static String USER_NAME = "scott";
    private static String PASSWORD = "tiger";

    public static void main(String[] args) throws SQLException, IOException {

        Connection newConnection = getNewConnection();
        BufferedWriter bw = new BufferedWriter(new FileWriter("./extractedFile/RawDataFile.txt"));
        PreparedStatement extractableRowCount = getExtractableRowCount(newConnection, (long)34212);
        ResultSet foundCountRs = extractableRowCount.executeQuery();
        foundCountRs.next();
        int foundCount = foundCountRs.getInt(1);
        //`here I get 14 as the count`
        System.out.println("Available rows for id:: 34212 are "+foundCount);
        foundCountRs.close();
        extractableRowCount.close();
        PreparedStatement fetchBinaryQueryStatement = getExtractableRow(newConnection, (long)34212);
        ResultSet fetchedRowsRs = fetchBinaryQueryStatement.executeQuery();

        int i=0;
        while (fetchedRowsRs.next()) {
            i++;
            //`I see outputs upto i=13, and then I get ArrayIndexOutOfBoundsException 
            System.out.println("i = " + i);
            String userName = fetchedRowsRs.getString("user_name");
            InputStream savedTextData = fetchedRowsRs.getBinaryStream("saved_text");

            bw.write(userName + ":: ");
            int len = 0;
            if (savedTextData != null) {
                while ((len = savedTextData.read()) != -1) {
                    bw.write((char) len);
                    bw.flush();
                }
            }
            fetchedRowsRs.close();
            fetchBinaryQueryStatement.close();

        }
        bw.close();

    }

    public static Connection getNewConnection() throws SQLException {

        DriverManager.registerDriver(new oracle.jdbc.OracleDriver());
        return DriverManager.getConnection(URL, USER_NAME, PASSWORD);

    }

    public static PreparedStatement getExtractableRow(Connection connection, Long id) throws SQLException {
        PreparedStatement statement = connection.prepareStatement("SELECT user_name, saved_text FROM user_email_text_data where id = ?");
        statement.setLong(1, id);
        return statement;
    }

    public static PreparedStatement getExtractableRowCount(Connection connection, Long id) throws SQLException {
        PreparedStatement statement = connection.prepareStatement("SELECT count(1) FROM user_email_text_data where id = ?");
        statement.setLong(1, id);
        return statement;
    }

}

错误的完整堆栈跟踪：

Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 8
    at oracle.jdbc.driver.T4CMAREngineNIO.buffer2Value(T4CMAREngineNIO.java:814)
    at oracle.jdbc.driver.T4CMAREngineNIO.unmarshalUB2(T4CMAREngineNIO.java:577)
    at oracle.jdbc.driver.T4CMAREngineNIO.unmarshalSB2(T4CMAREngineNIO.java:557)
    at oracle.jdbc.driver.T4CMAREngine.processIndicator(T4CMAREngine.java:1573)
    at oracle.jdbc.driver.T4CMarshaller$StreamMarshaller.unmarshalOneRow(T4CMarshaller.java:179)
    at oracle.jdbc.driver.T4CLongRawAccessor.unmarshalOneRow(T4CLongRawAccessor.java:159)
    at oracle.jdbc.driver.T4CTTIrxd.unmarshal(T4CTTIrxd.java:1526)
    at oracle.jdbc.driver.T4CTTIrxd.unmarshal(T4CTTIrxd.java:1289)
    at oracle.jdbc.driver.T4C8Oall.readRXD(T4C8Oall.java:850)
    at oracle.jdbc.driver.T4CTTIfun.receive(T4CTTIfun.java:543)
    at oracle.jdbc.driver.T4CTTIfun.doRPC(T4CTTIfun.java:252)
    at oracle.jdbc.driver.T4C8Oall.doOALL(T4C8Oall.java:612)
    at oracle.jdbc.driver.T4CPreparedStatement.doOall8(T4CPreparedStatement.java:226)
    at oracle.jdbc.driver.T4CPreparedStatement.fetch(T4CPreparedStatement.java:1023)
    at oracle.jdbc.driver.OracleStatement.fetchMoreRows(OracleStatement.java:3353)
    at oracle.jdbc.driver.InsensitiveScrollableResultSet.fetchMoreRows(InsensitiveScrollableResultSet.java:736)
    at oracle.jdbc.driver.InsensitiveScrollableResultSet.absoluteInternal(InsensitiveScrollableResultSet.java:692)
    at oracle.jdbc.driver.InsensitiveScrollableResultSet.next(InsensitiveScrollableResultSet.java:406)

Answer 1

我在使用 ojdbc8-12.2.0.1 调用 ResultSet.next() 时遇到完全相同的异常：

java.lang.ArrayIndexOutOfBoundsException: 8
at oracle.jdbc.driver.T4CMAREngineNIO.buffer2Value(T4CMAREngineNIO.java:814)
at oracle.jdbc.driver.T4CMAREngineNIO.unmarshalUB2(T4CMAREngineNIO.java:577)
at oracle.jdbc.driver.T4CMAREngineNIO.unmarshalSB2(T4CMAREngineNIO.java:557)
at oracle.jdbc.driver.T4CMAREngine.processIndicator(T4CMAREngine.java:1573)
at oracle.jdbc.driver.T4CMarshaller$StreamMarshaller.unmarshalOneRow(T4CMarshaller.java:179)
at oracle.jdbc.driver.T4CLongRawAccessor.unmarshalOneRow(T4CLongRawAccessor.java:159)
at oracle.jdbc.driver.T4CTTIrxd.unmarshal(T4CTTIrxd.java:1526)
at oracle.jdbc.driver.T4CTTIrxd.unmarshal(T4CTTIrxd.java:1289)
at oracle.jdbc.driver.T4C8Oall.readRXD(T4C8Oall.java:850)
at oracle.jdbc.driver.T4CTTIfun.receive(T4CTTIfun.java:543)
at oracle.jdbc.driver.T4CTTIfun.doRPC(T4CTTIfun.java:252)
at oracle.jdbc.driver.T4C8Oall.doOALL(T4C8Oall.java:612)
at oracle.jdbc.driver.T4CPreparedStatement.doOall8(T4CPreparedStatement.java:226)
at oracle.jdbc.driver.T4CPreparedStatement.fetch(T4CPreparedStatement.java:1023)
at oracle.jdbc.driver.OracleStatement.fetchMoreRows(OracleStatement.java:3353)

将驱动程序版本升级到ojdbc8-18.3.0.0后，异常消失。

如果有人遇到同样的情况，更新 JDBC 驱动程序可能值得一试。

Answer 2

以下几行位于外部while循环的末尾，但需要在循环后执行，因为您无法关闭结果集对象，然后调用{{ 1}}

next()

Answer 3

由于数组的大小是14，因此最后一个索引是从0开始的13，因此您要访问的索引值大于数组的大小，这将导致ArrayOutOfBound异常。

当有更多行时执行resultSet.next（）时发生ArrayIndexOutOfBoundsException

3 个答案: