iBatis动态SQL标签用法

将ibatis log4j运行级别调到DEBUG可以在控制台打印出ibatis运行的sql语句,方便调试:

log4j.logger.com.ibatis=DEBUG
log4j.logger.com.ibatis.common.jdbc.SimpleDataSource=DEBUG
log4j.logger.com.ibatis.common.jdbc.ScriptRunner=DEBUG
log4j.logger.com.ibatis.sqlmap.engine.impl.SqlMapClientDelegate=DEBUG
log4j.logger.java.sql.Connection=DEBUG
log4j.logger.java.sql.Statement=DEBUG

log4j.logger.java.sql.PreparedStatement=DEBUG 

在ibatis中使用安全的拼接语句,动态查询
ibatis比JDBC的优势之一,安全高效
说明文字在注释中

  <select id="selectAllProducts" parameterClass="Product" resultMap="ProductResult">
    select id,note from Product
       <dynamic prepend="WHERE">
       <!-- isNotNull判断参数是否存在,Integer类型 -->
            <isNotNull property="id">
                <!-- isGreaterThan判断参数是否大于compareValue,isGreaterEquals是大于等于 -->
                <isGreaterThan prepend=" and " property="id" compareValue="0">
                id = #id#
                </isGreaterThan>
            </isNotNull>
            <!-- isNotEmpty判断字串不为空,isEmpty可以判断字串为空 -->
            <isNotEmpty prepend=" and " property="note">
            <!-- 模糊查询不能用#,#在是用prepareStatement的?插入参数,$是文本替换 -->
            note like '%$note$%'
            </isNotEmpty>
        </dynamic>
  </select>
  
用Map传参数
  
  <select id="selectAllProducts" parameterClass="java.util.HashMap" resultMap="ProductResult">
    select id,note from Product
       <dynamic prepend="WHERE">
       <!-- isPropertyAvailable判断属性是否有效 -->
          <isPropertyAvailable property="id">
            <isNotNull property="id">
                <!-- isLessThan判断参数是否小于compareValue,isLessEquals是小于等于 -->
                <isLessThan prepend=" and " property="id" compareValue="10">
                id = #id#
                </isLessThan>
            </isNotNull>
          </isPropertyAvailable>
        </dynamic>
  </select>

 ------------------------------------------------------------------几个常用属性

<isPropertyAvailable> 属性是存在
<isNotPropertyAvailable> 属性不存在
<isNull> 属性值是null
<isEmpty> 判断Collection.size<1或String.length()<1
<isEqual> 等于
<isNotEqual> 不等于
<isGreaterThan> 大于
<isGreaterEqual> 大于等于
<isLessThan> 小于
<isLessEqual> 小于等于

 

1、动态SQL片段

通过SQL片段达到代码复用

        <!-- 动态条件分页查询 --> 
        <sql id="sql_count"> 
                select count(*) 
        </sql> 
        <sql id="sql_select"> 
                select * 
        </sql> 
        <sql id="sql_where"> 
                from icp 
                <dynamic prepend="where"> 
                        <isNotEmpty prepend="and" property="name"> 
                                name like '%$name$%' 
                        </isNotEmpty> 
                        <isNotEmpty prepend="and" property="path"> 
                                path like '%path$%' 
                        </isNotEmpty> 
                        <isNotEmpty prepend="and" property="area_id"> 
                                area_id = #area_id# 
                        </isNotEmpty> 
                        <isNotEmpty prepend="and" property="hided"> 
                                hided = #hided# 
                        </isNotEmpty> 
                </dynamic> 
                <dynamic prepend=""> 
                        <isNotNull property="_start"> 
                                <isNotNull property="_size"> 
                                        limit #_start#, #_size# 
                                </isNotNull> 
                        </isNotNull> 
                </dynamic> 
        </sql> 
        <select id="findByParamsForCount" parameterClass="map" resultClass="int"> 
                <include refid="sql_count"/> 
                <include refid="sql_where"/> 
        </select> 
        <select id="findByParams" parameterClass="map" resultMap="icp.result_base"> 
                <include refid="sql_select"/> 
                <include refid="sql_where"/> 
        </select>

 

2、数字范围查询

所传参数名称是捏造所得，非数据库字段，比如_img_size_ge、_img_size_lt字段

                        <isNotEmpty prepend="and" property="_img_size_ge"> 
                                <![CDATA[ 
                                img_size >= #_img_size_ge# 
                        ]]> 
                        </isNotEmpty> 
                        <isNotEmpty prepend="and" property="_img_size_lt"> 
                                <![CDATA[ 
                                img_size < #_img_size_lt# 
                        ]]> 
                        </isNotEmpty> 

 

多次使用一个参数也是允许的

                        <isNotEmpty prepend="and" property="_now"> 
                                <![CDATA[ 
                                            execplantime >= #_now# 
                                     ]]> 
                        </isNotEmpty> 
                        <isNotEmpty prepend="and" property="_now"> 
                                <![CDATA[ 
                                            closeplantime <= #_now# 
                                     ]]> 
                        </isNotEmpty>

 

3、时间范围查询

                        <isNotEmpty prepend="" property="_starttime"> 
                                <isNotEmpty prepend="and" property="_endtime"> 
                                        <![CDATA[ 
                                        createtime >= #_starttime# 
                                        and createtime < #_endtime# 
                                 ]]> 
                                </isNotEmpty> 
                        </isNotEmpty> 

 

4、in查询

                        <isNotEmpty prepend="and" property="_in_state"> 
                                state in ('$_in_state$') 
                        </isNotEmpty>

 

5、like查询

                        <isNotEmpty prepend="and" property="chnameone"> 
                                (chnameone like '%$chnameone$%' or spellinitial like '%$chnameone$%') 
                        </isNotEmpty> 
                        <isNotEmpty prepend="and" property="chnametwo"> 
                                chnametwo like '%$chnametwo$%' 
                        </isNotEmpty> 

 

6、or条件

                        <isEqual prepend="and" property="_exeable" compareValue="N"> 
                                <![CDATA[ 
                                (t.finished='11'    or t.failure=3) 
                        ]]> 
                        </isEqual>

 

                        <isEqual prepend="and" property="_exeable" compareValue="Y"> 
                                <![CDATA[ 
                                t.finished in ('10','19') and t.failure<3 
                        ]]> 
                        </isEqual>

 

7、where子查询

                        <isNotEmpty prepend="" property="exprogramcode"> 
                                <isNotEmpty prepend="" property="isRational"> 
                                        <isEqual prepend="and" property="isRational" compareValue="N"> 
                                                code not in 
                                                (select t.contentcode 
                                                from cms_ccm_programcontent t 
                                                where t.contenttype='MZNRLX_MA' 
                                                and t.programcode = #exprogramcode#) 
                                        </isEqual> 
                                </isNotEmpty> 
                        </isNotEmpty>

 

        <select id="findByProgramcode" parameterClass="string" resultMap="cms_ccm_material.result"> 
                select * 
                from cms_ccm_material 
                where code in 
                (select t.contentcode 
                from cms_ccm_programcontent t 
                where t.contenttype = 'MZNRLX_MA' 
                and programcode = #value#) 
                order by updatetime desc 
        </select>

 

9、函数的使用

        <!-- 添加 --> 
        <insert id="insert" parameterClass="RuleMaster"> 
                insert into rulemaster( 
                name, 
                createtime, 
                updatetime, 
                remark 
                ) values ( 
                #name#, 
                now(), 
                now(), 
                #remark# 
                ) 
                <selectKey keyProperty="id" resultClass="long"> 
                        select LAST_INSERT_ID() 
                </selectKey> 
        </insert> 
        <!-- 更新 --> 
        <update id="update" parameterClass="RuleMaster"> 
                update rulemaster set 
                name = #name#, 
                updatetime = now(), 
                remark = #remark# 
                where id = #id# 
        </update>

 

10、map结果集

        <!-- 动态条件分页查询 --> 
        <sql id="sql_count"> 
                select count(a.*) 
        </sql> 
        <sql id="sql_select"> 
                select a.id                vid, 
                a.img             imgurl, 
                a.img_s         imgfile, 
                b.vfilename vfilename, 
    b.name            name, 
                c.id                sid, 
                c.url             url, 
                c.filename    filename, 
                c.status        status 
        </sql> 
        <sql id="sql_where"> 
                From secfiles c, juji b, videoinfo a 
                where 
                a.id = b. videoid 
                and b.id = c.segmentid 
                and c.status = 0 
                order by a.id asc,b.id asc,c.sortnum asc 
                <dynamic prepend=""> 
                        <isNotNull property="_start"> 
                                <isNotNull property="_size"> 
                                        limit #_start#, #_size# 
                                </isNotNull> 
                        </isNotNull> 
                </dynamic> 
        </sql> 
        <!-- 返回没有下载的记录总数 --> 
        <select id="getUndownFilesForCount" parameterClass="map" resultClass="int"> 
                <include refid="sql_count"/> 
                <include refid="sql_where"/> 
        </select> 
        <!-- 返回没有下载的记录 --> 
        <select id="getUndownFiles" parameterClass="map" resultClass="java.util.HashMap"> 
                <include refid="sql_select"/> 
                <include refid="sql_where"/> 
        </select>