springboot jdbctemplate 常用的语法

1.新增数据 返回自增主键ID

public int add(Map<String,Object> paramMap) {
    long nowTime = System.currentTimeMillis(); // 当前时间
    String sql = "insert into " + tableName + " (device_no,device_key,device_type,channel_type_id,phone_type,is_attent,serial_no,member_id,sub_member_id,cashier_id,update_time,c_date,state,source_id,ios_type) " +
            "values (?,?,?,?,?,?,?,?,?,?,?,?,?,?,?)";
    KeyHolder keyHolder = new GeneratedKeyHolder();
    jdbcTemplateNotify.update(new PreparedStatementCreator() {
        @Override
        public PreparedStatement createPreparedStatement(Connection con) throws SQLException {
            PreparedStatement preparedStatement = con.prepareStatement(sql, Statement.RETURN_GENERATED_KEYS);
            preparedStatement.setString(1, ComMapUtils.getString(paramMap,"deviceNo"));
            preparedStatement.setString(2, ComMapUtils.getString(paramMap,"deviceKey"));
            preparedStatement.setString(3, ComMapUtils.getString(paramMap,"deviceType"));
            preparedStatement.setInt(4, ComMapUtils.getInteger(paramMap,"channelTypeId"));
            preparedStatement.setInt(5, ComMapUtils.getInteger(paramMap,"phoneType"));
            preparedStatement.setInt(6, ComMapUtils.getInteger(paramMap,"isAttent"));
            preparedStatement.setInt(7, ComMapUtils.getInteger(paramMap,"serialNo"));
            preparedStatement.setInt(8, ComMapUtils.getInteger(paramMap,"memberId"));
            preparedStatement.setInt(9, ComMapUtils.getInteger(paramMap,"subMemberId"));
            preparedStatement.setInt(10, ComMapUtils.getInteger(paramMap,"cashierId"));
            preparedStatement.setLong(11, nowTime);
            preparedStatement.setLong(12, nowTime);
            preparedStatement.setInt(13, ComMapUtils.getInteger(paramMap,"state"));
            preparedStatement.setInt(14, ComMapUtils.getInteger(paramMap,"sourcId"));
            preparedStatement.setInt(15, ComMapUtils.getInteger(paramMap,"iosType"));
            return preparedStatement;
        }
    }, keyHolder);
    int id = keyHolder.getKey().intValue();
    return id;
}

在这里为什么使用 con.prepareStatement(sql, Statement.RETURN_GENERATED_KEYS); 请查看：https://www.cnblogs.com/gwq369/p/5438224.html

2.查询List<Map<String, Object>>

public List<Map<String, Object>> queryDevices(Integer memberId, String deviceType) {
        String sql = "select * from " + tableName + " where member_id=" + memberId + " and device_type='" + deviceType + "' and state=1 order by device_id desc limit 1";
        List<Map<String, Object>> list = jdbcTemplateNotify.queryForList(sql);
        return list;
}

查询条件是字符串的话需要加上 ' '

3.修改

public int updateTuiSongSet(int tuisongSetId, String tuisongFlag, String tuisongType, int parentMemberId, String parentPayFlag) {
    StringJoiner joiner = new StringJoiner(",", "update " + tableName + " set", " where tuisong_set_id=" + tuisongSetId);
    if (!tuisongFlag.isEmpty()) {
        joiner.add(" tuisong_flag=" + tuisongFlag);
    }
    if (!tuisongType.isEmpty()) {
        joiner.add(" tuisong_type='" + tuisongType + "'");
    }
    if (parentMemberId > 0) {
        joiner.add(" parent_member_id=" + parentMemberId);
    }
    if (!parentPayFlag.isEmpty()) {
        joiner.add(" parent_pay_flag=" + parentPayFlag);
    }
    int update = jdbcTemplateNotify.update(joiner.toString());
    return update;
}

 使用 StringJoiner 进行拼接查询条件