批量操作主键冲突
我的服务器环境是AIX，java独立程序，数据库是oracle11
代码是把数据从一个大表A中，把前一天的数据，导到另外一个表B中，两个A、B表主键一样。代码进行先删（不管库表中有没有这个主键的数据）后插库。但是报错了，自知不应该setAutoCommit(true)，但是不确定是不是这个问题，服务器不可以乱测试，也不可能有多次给人尝试的机会，所以想一次定位问题，解决掉，谢谢各位大侠了。后代码如下 ：
public void doHscSnap() throws Exception {
String hscTable = reconVO.getTableName();
String hscSnapTable = reconVO.getHscSnapTable();
Connection con = null;
PreparedStatement stmt = null;
PreparedStatement stmt2 = null;
ResultSet rs = null;
int count = 0;
Snapdb snapdb = new Snapdb();
String[] pks = StringUtils.splitPreserveAllTokens(reconVO.getPrimaryKey(), "|"); 
String[] cols = StringUtils.splitPreserveAllTokens(reconVO.getTableColumn(), "|");
String colSpit = reconVO.getTableColumn().replaceAll("\\|", ",");
try {
con = snapdb.getConnection();
con.setAutoCommit(true);
delDate(snapdb);//删除N天前数据,包括N天

rs = snapdb.getSnapDateFromHsc(reconVO.getTableColumn(), hscTable, reconVO.getPrimaryKey());
//getSnapDateFromHsc(this.getHscTable(),this.linkPk,getVoSnapHsc());
StringBuffer insertSb = new StringBuffer();
StringBuffer deleteSb = new StringBuffer();
insertSb.append("INSERT INTO ");
insertSb.append(hscSnapTable);
insertSb.append("(");
insertSb.append(colSpit);
insertSb.append(",UPDATETIME)");
insertSb.append(" VALUES(");
for(count=0;count<cols.length;count++){
insertSb.append("?,");
}
insertSb.append("?)");

deleteSb.append("DELETE FROM ");
deleteSb.append(hscSnapTable);
deleteSb.append(" WHERE 1=1 ");
for(String pk : pks ){
deleteSb.append(" AND ");
deleteSb.append(pk);
deleteSb.append("=? ");
}

stmt = con.prepareStatement(insertSb.toString());
stmt2 = con.prepareStatement(deleteSb.toString());
int index =0;
int pkIndex = 0;
long psCount = 0;
while(rs.next()){
index =0; 
pkIndex = 0;
for(String col:cols){
index++;
setValtoSql(col, rs, stmt, index);
for(String pk : pks ){
if(col.equalsIgnoreCase(pk)){
pkIndex++;
setValtoSql(col, rs, stmt2, pkIndex);
}
}
}
stmt2.addBatch();
index++;
stmt.setTimestamp(index, rs.getTimestamp("CHANGEDATE"));
stmt.addBatch();
psCount++;
if(psCount %500 ==0){//批量删除,批量保存
stmt2.executeBatch();
stmt2.clearBatch();

stmt.executeBatch();
stmt.clearBatch();
}
}
if(psCount %500 >0){
stmt2.executeBatch();
stmt2.clearBatch();
stmt.executeBatch();
stmt.clearBatch();
}
log.info(threadName+">>>>>hsc data total ="+psCount);
} catch (Exception e) {
log.error(threadName+">>>>>snap hsc data error :"+e.getMessage());
e.printStackTrace();
}finally{
if(rs!=null)
rs.close();
//hscdb.closePrepared();
if(stmt!=null)
stmt.close();
if(stmt2!=null)
stmt2.close();
if(con != null)
con.close();
snapdb.closePrepared();
}
}

报错如下 ：2012-03-07 00:00:17,412 ERROR [ReconBO] - CaBillmail>>>>>snap hsc data error :ORA-00001: unique constraint (ZHHSC.PK_HSC_CA_BILLMAIL_SNAP) violated


补充一下：这段代码在服务器上跑了一个多月都没问题，现在突然天天出问题。求救呀。。

------解决方案--------------------
可能存在这样一个问题，你没删除掉，数据又插进来了
建议在删除和插入之间清一下 session
------解决方案-------