一个针对BatchPreparedStatementSetter的代码

是关于JdbcTemplate批量操作方法的, 很少用, 备注一下!

    public int[] batchUpdate(String jdbcTemplateId, String sql, final List<Map<String, String>> rows,
            final List<String> columnNames, final Map<String, String> columnTypes) throws Exception {
        JdbcTemplate jdbcTemplate = jdbcTemplates.get(jdbcTemplateId);
        BatchPreparedStatementSetter pss = new BatchPreparedStatementSetter() {
            
            public void setValues(PreparedStatement ps, int i) throws SQLException {
                Map<String, String> row = rows.get(i);

                if (DbUtils.isInvalidRow(row)) {
                    return;
                }

                int columnIndex = 0;
                for (String columnName : columnNames) {
                    Object value = DbUtils.convertValue(row, columnName, columnTypes);

                    ps.setObject(++columnIndex, value);
                }
            }
            
            public int getBatchSize() {
                return rows.size();
            }
        };
        return jdbcTemplate.batchUpdate(sql, pss);
    }