關於拼接SQL語句sqlMap的使用方法

1.為什么使用？

  主要還是為了代碼中獲取到值，然后帶入SQL語句中拼接查詢

2.怎么使用？

1）bean繼承了BaseEntity類，該類中有

    /**
     * 自定義SQL（SQL標識，SQL內容）
     */
    protected Map<String, String> sqlMap;
    @JsonIgnore
    @XmlTransient
    public Map<String, String> getSqlMap() {
        if (sqlMap == null){
            sqlMap = Maps.newHashMap();
        }
        return sqlMap;
    }
     public void setSqlMap(Map<String, String> sqlMap) {
        this.sqlMap = sqlMap;
    }

2）XML中如何寫？

<select id="findList" resultType="ZlfbBean">
        SELECT * FROM (
            SELECT    <include refid="ZlfbBeanColumns"/>
            FROM ZL_HCZZ i <include refid="ZlfbBeanJoins"/>
            <where>
            AND i.del_flag = #{DEL_FLAG_NORMAL} 
            ${sqlMap.dsf} //此處加入service中的限制條件
            <if test="zlbh != null and zlbh != ''">
                AND i.ZLBH = #{zlbh}
            </if>
            <if test="createBy != null and createBy.id != null and createBy.id != ''">
                AND i.CREATE_BY = #{createBy.id}
            </if>
            <if test="office != null and office.id != null and office.id != ''">
                AND i.OFFICE_ID = #{office.id}
            </if>
            </where>
            ORDER BY i.CREATE_DATE DESC,i.UPDATE_DATE DESC
        ) t
        <where>
            AND t.del_flag = #{DEL_FLAG_NORMAL} 
            <if test="beginInDate != null and beginInDate != ''">
                AND t.CREATE_DATE <![CDATA[ >= #{beginInDate} ]]>
            </if>
            <if test="endInDate != null and endInDate != ''">
                AND t.CREATE_DATE <![CDATA[ <= #{endInDate} ]]>
            </if>
        </where>
    </select>

3）service中：

public Page<ZlfbBean> findzlfb(Page<ZlfbBean> page,ZlfbBean bean){
        // 生成數據權限過濾條件（dsf為dataScopeFilter的簡寫，在xml中使用 ${sqlMap.dsf}調用權限SQL）
        User user = UserUtils.getUser();
        String dsf = dataScopeFilter( user, "l", "k");//返回的是如AND (k.id='user.getId()')
        if((bean.getCreateBy()==null || bean.getCreateBy().getId().equals("")) && (bean.getOffice()==null || bean.getOffice().getId().equals(""))){
            dsf = dsf+" OR i.zlbh IN( "
                +" SELECT  DISTINCT t1.zlbh FROM ZL_HCZZ t1 join ZL_HCZZSP t2 on t1.zlbh=t2.zlbh where t2.CREATE_BY = "+user.getId()
                +" ) "
                +" OR i.zlbh IN( " 
                +" SELECT  DISTINCT t1.zlbh FROM ZL_HCZZ t1 join ZL_HCZZQS t2 on t1.zlbh=t2.zlbh where t2.CREATE_BY = "+user.getId()+" OR ((SELECT COUNT(1) FROM SYS_USER WHERE id="+user.getId()+" and qsqx='01' and office_id='"+user.getOffice().getId()+"') > 0 ) AND t2.QS_DW = '"+user.getOffice().getId()+"' "
                +" ) "
                +" OR i.zlbh IN( "
                +" SELECT  DISTINCT t1.zlbh FROM ZL_HCZZ t1 join ZL_HCZZFK t2 on t1.zlbh=t2.zlbh where t2.CREATE_BY = "+user.getId()
                +" ) ";
        }
        bean.getSqlMap().put("dsf", dsf);給sqlmap集合中添加值，即添加一個dsf字符串的值為dsf
        // 設置分頁參數
        bean.setPage(page);
        // 執行分頁查詢
        page.setList(zlfbDao.findList(bean));
        return page;
    }