iBatis动态SQL标签用法

最新推荐文章于 2025-08-12 21:03:53 发布

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最新推荐文章于 2025-08-12 21:03:53 发布

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分类专栏： spring+strut2+hibernate+ibatis+jpa 文章标签： java 数据库

本文链接：https://blog.youkuaiyun.com/u011660647/article/details/84366095

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本文详细介绍了如何在IBatis框架中利用动态SQL片段实现代码复用，包括安全的拼接语句、数字范围查询、时间范围查询、in查询、like查询、or条件、where子查询等常见用法，并提供了多个实例来展示如何灵活运用这些特性进行复杂查询操作。

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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 property="id">
                
                <isGreaterThan prepend=" and " property="id" compareValue="0">
                id = #id#
                </isGreaterThan>
            </isNotNull>
            
            <isNotEmpty prepend=" and " property="note">
            
            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 property="id">
            <isNotNull property="id">
                
                <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

<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

多次使用一个参数也是允许的

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

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

<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>
        
        <update id="update" parameterClass="RuleMaster">
                update rulemaster set
                name = #name#,
                updatetime = now(),
                remark = #remark#
                where id = #id#
        </update>

10、map结果集

<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>
        
        <select id="getUndownFilesForCount" parameterClass="map" resultClass="int">
                <include refid="sql_count"/>
                <include refid="sql_where"/>
        </select>
        
        <select id="getUndownFiles" parameterClass="map" resultClass="java.util.HashMap">
                <include refid="sql_select"/>
                <include refid="sql_where"/>
        </select>