又是关于prepareStatement提高性能的问题，请帮忙看一下！

conn = dataSource.getConnection();
conn.setAutoCommit(false);
pstmt = conn.prepareStatement("insert into test values(?,?)");
for(int i=0;i<300000;i++)
{
    pstmt.setObject(1, new Integer(i+1));
    pstmt.setObject(2, "xxx"+i);
    int rowCount = pstmt.executeUpdate();
    if( rowCount !=1 ) throw new Exception("insert error:["+(i+1)+"].");
}
conn.commit();
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conn = dataSource.getConnection();
conn.setAutoCommit(false);
stmt = conn.createStatement();
for(int i=0;i<300000;i++)
{
    int rowCount = stmt.executeUpdate("insert into test values("+(i+1)+",'s"+(i+1)+"')");
    if( rowCount !=1 ) throw new Exception("insert error:["+(i+1)+"].");
}
conn.commit();
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