Ibatis动态查询例子(#和$以及iterate等的用法)

最近做了很多动态的查询,尤其是排序,以及一些状态字段,所以就做了一个总的动态查询,以不变应万变,呵呵

 

ibatis 里面的sql代码:

<select id="getTopics" resultClass="topic" parameterClass="map">
        <![CDATA[
                select * from p_Topic
        ]]>
    <dynamic prepend=" WHERE ">
        <isPropertyAvailable property="authorId">
            <isNotNull property="authorId" prepend=" and ">
                authorId=#authorId#
               </isNotNull>
        </isPropertyAvailable>
        <isPropertyAvailable property="marketId">
            <isNotNull property="marketId" prepend=" and ">
                marketId=#marketId#
               </isNotNull>
        </isPropertyAvailable>

        <isPropertyAvailable property="isDelete">
            <isNotNull property="isDelete" prepend=" and ">
                isDelete=#isDelete#
               </isNotNull>
        </isPropertyAvailable>

        <isPropertyAvailable property="isBest">
            <isNotNull property="isBest" prepend=" and ">
                isBest=#isBest#
            </isNotNull>
        </isPropertyAvailable>

        <isPropertyAvailable property="statusStr">
            <isNotNull property="statusStr" prepend=" and ">
                $statusStr$
            </isNotNull>
        </isPropertyAvailable>
        <isPropertyAvailable property="marketIdList">
            <isNotNull property="marketIdList" prepend=" and marketId in ">
                <iterate property="marketIdList" conjunction="," close=")" open="(">
                    #marketIdList[]#
                </iterate>
            </isNotNull>
        </isPropertyAvailable>
    </dynamic>

    <dynamic prepend=" order by ">
        <isPropertyAvailable property="orderStr">
            <isNotNull property="orderStr">
                $orderStr$
               </isNotNull>
        </isPropertyAvailable>
    </dynamic>

    <dynamic>
        <isPropertyAvailable property="begin">
            <isNotNull property="begin">
                limit #begin#
               </isNotNull>
        </isPropertyAvailable>
        <isPropertyAvailable property="max" prepend=" , ">
            <isNotNull property="max">
                #max#
               </isNotNull>
        </isPropertyAvailable>
    </dynamic>
</select>



<select id="getTopicCount" resultClass="java.lang.Long"
    parameterClass="map">
        <![CDATA[
                select count(id) from p_Topic
        ]]>
    <dynamic prepend=" WHERE ">
        <isPropertyAvailable property="authorId">
            <isNotNull property="authorId" prepend=" and ">
                authorId=#authorId#
               </isNotNull>
        </isPropertyAvailable>
        <isPropertyAvailable property="marketId">
            <isNotNull property="marketId" prepend=" and ">
                marketId=#marketId#
               </isNotNull>
        </isPropertyAvailable>

        <isPropertyAvailable property="isDelete">
            <isNotNull property="isDelete" prepend=" and ">
                isDelete=#isDelete#
               </isNotNull>
        </isPropertyAvailable>

        <isPropertyAvailable property="isBest">
            <isNotNull property="isBest" prepend=" and ">
                isBest=#isBest#
            </isNotNull>
        </isPropertyAvailable>

        <isPropertyAvailable property="statusStr">
            <isNotNull property="statusStr" prepend=" and ">
                $statusStr$
            </isNotNull>
        </isPropertyAvailable>
        <isPropertyAvailable property="marketIdList">
            <isNotNull property="marketIdList" prepend=" and marketId in ">
                <iterate property="marketIdList" conjunction="," close=")" open="(">
                    #marketIdList[]#
                </iterate>
            </isNotNull>
        </isPropertyAvailable>
    </dynamic>
</select>

	<select id="getTopics" resultClass="topic" parameterClass="map">
			<![CDATA[
			        select * from p_Topic 
			]]>
		<dynamic prepend=" WHERE ">
			<isPropertyAvailable property="authorId">
				<isNotNull property="authorId" prepend=" and ">
					authorId=#authorId# 
                </isNotNull>
			</isPropertyAvailable>
			<isPropertyAvailable property="marketId">
				<isNotNull property="marketId" prepend=" and ">
					marketId=#marketId# 
                </isNotNull>
			</isPropertyAvailable>

			<isPropertyAvailable property="isDelete">
				<isNotNull property="isDelete" prepend=" and ">
					isDelete=#isDelete# 
                </isNotNull>
			</isPropertyAvailable>

			<isPropertyAvailable property="isBest">
				<isNotNull property="isBest" prepend=" and ">
					isBest=#isBest#
				</isNotNull>
			</isPropertyAvailable>

			<isPropertyAvailable property="statusStr">
				<isNotNull property="statusStr" prepend=" and ">
					$statusStr$
				</isNotNull>
			</isPropertyAvailable>
			<isPropertyAvailable property="marketIdList">
				<isNotNull property="marketIdList" prepend=" and marketId in ">
					<iterate property="marketIdList" conjunction="," close=")" open="(">
						#marketIdList[]#
					</iterate>
				</isNotNull>
			</isPropertyAvailable>
		</dynamic>

		<dynamic prepend=" order by ">
			<isPropertyAvailable property="orderStr">
				<isNotNull property="orderStr">
					$orderStr$
                </isNotNull>
			</isPropertyAvailable>
		</dynamic>

		<dynamic>
			<isPropertyAvailable property="begin">
				<isNotNull property="begin">
					limit #begin# 
                </isNotNull>
			</isPropertyAvailable>
			<isPropertyAvailable property="max" prepend=" , ">
				<isNotNull property="max">
					#max#
                </isNotNull>
			</isPropertyAvailable>
		</dynamic>
	</select>



	<select id="getTopicCount" resultClass="java.lang.Long"
		parameterClass="map">
			<![CDATA[
			        select count(id) from p_Topic 
			]]>
		<dynamic prepend=" WHERE ">
			<isPropertyAvailable property="authorId">
				<isNotNull property="authorId" prepend=" and ">
					authorId=#authorId# 
                </isNotNull>
			</isPropertyAvailable>
			<isPropertyAvailable property="marketId">
				<isNotNull property="marketId" prepend=" and ">
					marketId=#marketId# 
                </isNotNull>
			</isPropertyAvailable>

			<isPropertyAvailable property="isDelete">
				<isNotNull property="isDelete" prepend=" and ">
					isDelete=#isDelete# 
                </isNotNull>
			</isPropertyAvailable>

			<isPropertyAvailable property="isBest">
				<isNotNull property="isBest" prepend=" and ">
					isBest=#isBest#
				</isNotNull>
			</isPropertyAvailable>

			<isPropertyAvailable property="statusStr">
				<isNotNull property="statusStr" prepend=" and ">
					$statusStr$
				</isNotNull>
			</isPropertyAvailable>
			<isPropertyAvailable property="marketIdList">
				<isNotNull property="marketIdList" prepend=" and marketId in ">
					<iterate property="marketIdList" conjunction="," close=")" open="(">
						#marketIdList[]#
					</iterate>
				</isNotNull>
			</isPropertyAvailable>
		</dynamic>
	</select>

这里需要注意的是:

①#xxx#  代表xxx是属性值,map里面的key或者是你的pojo对象里面的属性,ibatis会自动在它的外面加上引号,表现在sql语句是这样的 where xxx = 'xxx' ;

   而$xxxx$ 则是把xxxx作为字符串拼接到你的sql语句中,比如 order by  topicId , 如果你不用$来拼接而用#的话,外面就会被加上引号的哦    比如你的语句这样写  ... order by #xxx# (xxx就是你传进来的字符串topicId),ibatis 就会把他翻译成  order by 'topicId' 这样就报错了 ,用$的结果就是这样  order by topicId

②这里的iterate

<isPropertyAvailable property="marketIdList">
    <isNotNull property="marketIdList" prepend=" and marketId in ">
        <iterate property="marketIdList" conjunction="," close=")" open="(">
            #marketIdList[]#
        </iterate>
    </isNotNull>
</isPropertyAvailable>

<isPropertyAvailable property="marketIdList">
	<isNotNull property="marketIdList" prepend=" and marketId in ">
		<iterate property="marketIdList" conjunction="," close=")" open="(">
			#marketIdList[]#
		</iterate>
	</isNotNull>
</isPropertyAvailable>

 注意 iterate 的property属性 ,虽然你上面的isNotNull什么的都有这句,但这里一定要写清楚,否则ibatis会找不到你的list的

 

 

数据访问层代码:

public List<Topic> getTopics(Map<String, Object> map) {

        return getSqlMapClientTemplate().queryForList("getTopics", map);
    }

public List<Topic> getTopics(Map<String, Object> map) {

		return getSqlMapClientTemplate().queryForList("getTopics", map);
	}

 服务层代码:

public List<Topic> getTopicsByMarketIdList(Long authorId,List<Long> marketIdList,
        Integer orderby, Integer status, Pagination pagination) {
    Map<String, Object> map = new HashMap<String, Object>();
    map.put("authorId", authorId);
    map.put("isDelete", false);
    map.put("marketIdList", marketIdList);
    map.put("orderStr", "这里你组装你的order字符串");
    map.put("statusStr","这里你组装你的status字符串");
    map.put("begin", pagination.getOffset());
    map.put("max", pagination.getPageSize());
              //这个getTopicCount()方法和getTopics()大体是一致的,所以我的dao里面省略了它
    Long total = topicDao.getTopicCount(map);
    if (total == 0) {
        return new ArrayList<Topic>();
    } else {
        pagination.setTotal(total);
        List<Topic> res = topicDao.getTopics(map);
        return res;
    }
}

	public List<Topic> getTopicsByMarketIdList(Long authorId,List<Long> marketIdList,
			Integer orderby, Integer status, Pagination pagination) {
		Map<String, Object> map = new HashMap<String, Object>();
		map.put("authorId", authorId);
		map.put("isDelete", false);
		map.put("marketIdList", marketIdList);
		map.put("orderStr", "这里你组装你的order字符串");
		map.put("statusStr","这里你组装你的status字符串");
		map.put("begin", pagination.getOffset());
		map.put("max", pagination.getPageSize());
               //这个getTopicCount()方法和getTopics()大体是一致的,所以我的dao里面省略了它
		Long total = topicDao.getTopicCount(map);
		if (total == 0) {
			return new ArrayList<Topic>();
		} else {
			pagination.setTotal(total);
			List<Topic> res = topicDao.getTopics(map);
			return res;
		}
	}

 

public class Topic extends BaseObject implements Serializable {
    /**
     *
     */
    private static final long serialVersionUID = -851973667810710701L;

    private Long id;
    private Long authorId;
    private String authorName;
    private Long marketId;
    private String title;
    private String tags;
    private String content;
    private Date pubdate;
    private Integer isBest;
    private Integer status;
    private Integer isDelete;
    private Integer clickCount;
    private Integer replyCount;
    private Date lastReplyTime;
       //getter and setter 省略...
}

public class Topic extends BaseObject implements Serializable {
	/**
	 * 
	 */
	private static final long serialVersionUID = -851973667810710701L;

	private Long id;
	private Long authorId;
	private String authorName;
	private Long marketId;
	private String title;
	private String tags;
	private String content;
	private Date pubdate;
	private Integer isBest;
	private Integer status;
	private Integer isDelete;
	private Integer clickCount;
	private Integer replyCount;
	private Date lastReplyTime;
       //getter and setter 省略...
}

Pagination代码:

public class Pagination {

    /**
     * 要查看的页码
     */
    private int page;

    /**
     * 每页显示数
     */
    private int pageSize;

    /**
     * 一共有多少页
     */
    private int totalPage;

    /**
     * 一共有多少条记录
     */
    private long total;

    /**
     * 当前页的记录数
     */
    private int size;

    /**
     * 只需要topxx，不需要页数信息了
     */
    private boolean topOnly;

      /**
       *从第几条记录开始
       */
    private int offset;

    public void setOffset(int offset) {
        this.offset = offset;
    }

    public Pagination(int page, int pageSize) {
        this.page = page;
        this.pageSize = pageSize;
    }

    public Pagination() {
    }

    public boolean require() {
        return pageSize > 0 ? true : false;
    }

    public int from() {
        return page * pageSize;
    }

    public int to() {
        return from() + size;
    }

    public int getPage() {
        return page;
    }

    public void setPage(int page) {
        this.page = page;
    }

    public int getPageSize() {
        return pageSize;
    }

    public void setPageSize(int pageSize) {
        this.pageSize = pageSize;
    }

    public int getTotalPage() {
        return totalPage;
    }

    public void setTotalPage(int totalPage) {
        this.totalPage = totalPage;
    }

    public long getTotal() {
        return total;
    }

    public void setTotal(long total) {
        this.total = total;
        if (pageSize > 0) {
            this.totalPage = (int) Math.ceil(total / (double) pageSize);
        } else {
            this.totalPage = 1;
        }
        if (page >= totalPage) {
            page = totalPage - 1;
        }
        if (page < 0)
            page = 0;
        if (pageSize > 0) {
            if (page < totalPage - 1)
                this.size = pageSize;
            else
                this.size = (int) (total % pageSize);
        } else

  


  
    
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