ibatis动态查询

http://www.iteye.com/topic/393042

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:

Xml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 "> 
                <iterate property="marketIdList" conjunction="," close=")" open=" marketId in ("> 

<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 ">
<iterate property="marketIdList" conjunction="," close=")" open=" marketId in (">Xml代码 
                #marketIdList[]#  
            </iterate> 
        </isNotNull> 
    </isPropertyAvailable> 
</dynamic> 
lt;/select> 

#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

Java代码 
<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:

Java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:

Java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;
}
}  Java代码 
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:

Java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 {  
            this.size = (int) total;  
        }  
        offset=page * pageSize;  
    }  
 
    public int getOffset() {  
        return offset;  
    }  
 
    public int getSize() {  
        return size;  
    }  
 
    public void setSize(int size) {  
        this.size = size;  
    }  
 
    public boolean isTopOnly() {  
        return topOnly;  
    }  
 
    public void setTopOnly(boolean topOnly) {  
        this.topOnly = topOnly;  
    }  
 
}