批量更新的有关问题

public int BatchUpdate(String[] fields, String tableName, String[] conditions,String id) {        Connection conn = null;         PreparedStatement pst = null;        int count=0;        String sql="";        try {            conn = ConnectionSource.getConnection();            conn.setAutoCommit(false);        for(int i=0;i<conditions.length;i++){        sql="update  "+tableName +" set "+fields[i]+" where "+id+"=?";        pst = conn.prepareStatement(sql);        pst.setObject(1, conditions[i]);           pst.addBatch();        }                    int[]s=    pst.executeBatch();             conn.commit();             count=s.length;        } catch (SQLException e) {            if(conn != null){                try {                    conn.rollback();                    conn.commit();                } catch (SQLException e1) {                    loggerError.error(sql);                    loggerError.error(e1);                    e1.printStackTrace();                }                }            loggerError.error(e);            e.printStackTrace();        } finally {            ConnectionSource.releaseSource(null, pst, conn);        }        return count;    }