请大家帮帮忙 如何在java语言中利用jdbc的方式往oracle表插入大数据量问题

我再项目开发过程中遇到需要对一张主表和一张明细表同时插入大数量，目前我采取的方式是直接利用statement将拼装sql语句，然后向数据库每1000条数据提交一次。基本类似如下的格式：

begin
insert into zb values (zb_seq.nextval,'aa');
insert into mxb values (mxb_seq.nextval, zb_seq.currval, 'bb');
insert into mxb values (mxb_seq.nextval, zb_seq.currval, 'bb');
insert into mxb values (mxb_seq.nextval, zb_seq.currval, 'bb');
insert into zb values (zb_seq.nextval,'cc');
insert into mxb values (mxb_seq.nextval, zb_seq.currval, 'dd');
insert into mxb values (mxb_seq.nextval, zb_seq.currval, 'dd');
insert into mxb values (mxb_seq.nextval, zb_seq.currval, 'dd');
end;

现在我看过关于使用PreparedStatement加executeBatch方法可以更快，主要想提高预编译sql文件的次数，从而达到提高效率。根据用去的需求，批量插入的记录越多越好，比如插入10W笔数据，那么主表需要插入10W，明细表至少是10W。目前想改进之后的数据库插入方式为：

insert into zb values (zb_seq.nextval,?);
insert into mxb values (mxb_seq.nextval, zb_seq.currval, ?);

想请大家帮我看看，解答几个问题：
1.PreparedStatement里面是否可以放多个sql？
2.我主表插入一条记录，明细表需要插入主表刚才插入的guid，该种模式是否适用？该怎么写？
3.尾部的错误到底该如何解决？

下面贴出的我的测试java类

import java.sql.Connection;
import java.sql.Driver;
import java.sql.DriverManager;
import java.sql.PreparedStatement;

public class testBatch {
	
	public void execBatchSql(){
        Connection conn = getConnection();      
		try{
			conn.setAutoCommit(false);
			long beginTime = System.currentTimeMillis();
			PreparedStatement pst = null;
			for (int i=0;i<10000;i++){
				pst = conn.prepareStatement("insert into zb values (zb_seq.nextval,?)");
				pst.setString(1, "testzb"+i);
				pst.addBatch();
				pst = conn.prepareStatement("insert into mxb values (mxb_seq.nextval, zb_seq.currval, ?)");
				for(int j=7;j<10;j++){
					pst.setString(1, "testmxb"+i+j);
					pst.addBatch();
				}
				if(i%1000 == 0){
					pst.executeBatch();
					conn.commit();
					pst.clearBatch();
				}
			}
			pst.executeBatch();
			long endTime = System.currentTimeMillis();
			System.out.println("用时:"+(endTime-beginTime)+"毫秒");
			pst.close();
			conn.close();
		}catch(Exception e){
			e.printStackTrace();
		}
		
	}
	
	public Connection getConnection(){
		Connection conn = null;
		try{
			String driverClassName = "oracle.jdbc.driver.OracleDriver";
			String url = "jdbc:oracle:thin:@10.40.6.68:1521:jszx";
			String user = "fszg";
			String password = "fszg";
			Class cc = Class.forName(driverClassName);
			Driver driver = (Driver)cc.newInstance();
			DriverManager.registerDriver(driver);
			conn = DriverManager.getConnection(url,user,password);
		}catch(Exception e){
			e.printStackTrace();
		}
		return conn;
	}
	
	
	
	public static void main(String[] agrs){
		testBatch t = new testBatch();
		t.execBatchSql();
		
	}

}

下面是我的建表语法，是oracle9i的数据库。

create table zb
(
guid number(20),
name varchar2(20)
);
create table mxb
(
guid number(20),
f_guid number(20),
name varchar2(20)
);
-- Create sequence 
create sequence zb_seq
minvalue 3304000000000000001
maxvalue 9999999999999999999
start with 3304000000000000001
increment by 1
cache 20;
-- Create sequence 
create sequence mxb_seq
minvalue 3306000000000000001
maxvalue 9999999999999999999
start with 3306000000000000001
increment by 1
cache 20;

但是我现在调试的时候却有问题，提示：

java.sql.BatchUpdateException: ORA-08002: sequence ZB_SEQ.CURRVAL is not yet defined in this session

	at oracle.jdbc.dbaccess.DBError.throwBatchUpdateException(DBError.java:459)
	at oracle.jdbc.driver.OraclePreparedStatement.executeBatch(OraclePreparedStatement.java:3907)
	at cn.com.gsoft.fszg.testBatch.execBatchSql(testBatch.java:26)
	at cn.com.gsoft.fszg.testBatch.main(testBatch.java:63)