Question

我在批处理中使用jdbc preparedStatement时遇到问题，并尝试从中创建生成的密钥。

代码：

        PreparedStatement stmt = null;
    ...
    connection.setAutoCommit(false);
    stmt = connection.prepareStatement(insertSuspiciousElement,new String[] {"external_id","element_id"});
final int elementBatchSize = 5000;
    int elementCount =0;
        for(BlSuspiciousElement element : elements){
        externalIds.add(element.getExternalId());
        stmt.setInt(1, element.getBlElementType().getElementTypeId());
        stmt.setString(2, element.getFirstname());
        stmt.addBatch();
        elementCount++;
        if(elementCount % elementBatchSize == 0){
            System.out.println("Running query with batch size for suspiciousElement");
            stmt.executeBatch();

            ResultSet keys = stmt.getGeneratedKeys();
            while(keys.next()){
                externalIdElementIdMapping.put(keys.getInt("external_id"),keys.getInt("element_id"));
            }
            keys.close();
            stmt.clearBatch();
            stmt.clearParameters();
            stmt.clearWarnings();
            System.out.println("Done query with batch size for suspiciousElement");
        }
        }

它在第一个stmt.executeBatch（）方法失败。

错误：

[30/01/12 15:54:41:684 CET] 00000029 RemoteExcepti E   CNTR0020E: EJB threw an unexpected (non-declared) exception during invocation of method "processFullFeedForPepAndRelationUpdateOnly" on bean "BeanId(CoRelateEar#AmlKycToolBO.jar#FactivaDBUpdater, null)". Exception data: java.lang.ArrayIndexOutOfBoundsException
at oracle.jdbc.driver.T4CNumberAccessor.unmarshalOneRow(T4CNumberAccessor.java:201)
at oracle.jdbc.driver.T4C8Oall.readRXD(T4C8Oall.java:696)
at oracle.jdbc.driver.T4CTTIfun.receive(T4CTTIfun.java:340)
at oracle.jdbc.driver.T4CTTIfun.doRPC(T4CTTIfun.java:192)
at oracle.jdbc.driver.T4C8Oall.doOALL(T4C8Oall.java:531)
at oracle.jdbc.driver.T4CPreparedStatement.doOall8(T4CPreparedStatement.java:207)
at oracle.jdbc.driver.T4CPreparedStatement.executeForRows(T4CPreparedStatement.java:1044)
at oracle.jdbc.driver.OraclePreparedStatement.executeForRowsWithTimeout(OraclePreparedStatement.java:10143)
at oracle.jdbc.driver.OraclePreparedStatement.executeBatch(OraclePreparedStatement.java:10249)
at oracle.jdbc.driver.OracleStatementWrapper.executeBatch(OracleStatementWrapper.java:230)
at com.ibm.ws.rsadapter.jdbc.WSJdbcStatement.executeBatch(WSJdbcStatement.java:748)

对我来说不是很明显......

它似乎不适用于批量更新？仅用于声明或准备好的声明。在这种情况下，我想我最好尝试进行批量插入，然后运行另一个查询来查找每个创建的元素生成的键...

感谢您的帮助，

˚F

Answer 1

我相信您应该告诉Oracle JDBC驱动程序您要检索生成的密钥。

查看以下问题的接受答案以获取详细信息：PreparedStatement with Statement.RETURN_GENERATED_KEYS。

编辑1/31/12：如果这种方法不适用于批处理（我没有使用批处理），您可以代替批处理，只需关闭自动提交，插入所有数据，以及然后提交。在我的实验中，这种方法的性能损失仅为3％。我还在SO上发现了另一个类似的建议：MySQL batch stmt with Statement.RETURN_GENERATED_KEYS。

JDBC PreparedStatement，批量更新和生成的密钥

1 个答案: