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 >