PS:ibatis3如何傳遞多個參數有兩個方法:一種是使用java.Map,另一種是使用JavaBean。
當只向xxxMapper.xml文件中傳遞一個參數時,可以簡單的用“_parameter”來接收xxxMapper.java傳遞進來的參數,并代入查詢,比如說這樣:
(1)xxxMapper.java文件中這樣定義:
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List<String> selectAllAirportCode(Boolean mapping); |
(2)這時在對應的xxxMapper.xml文件中可以使用“_parameter”來接收這個參數:
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< select id= "selectAllAirportCode" resultType= "java.lang.String" parameterType= "java.lang.Boolean" > select DEPARTURE_AIRPORT from USR_AIR_LINE union select ARRIVAL_AIRPORT from USR_AIR_LINE <if test= "_parameter == true" > union select REL_DEPARTURE_AIRPORT from USR_AIR_LINE union select REL_ARRIVAL_AIRPORT from USR_AIR_LINE </if> </ select > |
但是,如果在xxxMapper.java文件中傳遞進來多個參數,就不能使用上面這種形式來接收參數,這時可以有兩種方案來解決這個問題:
一 向xml文件中傳遞進去一個Map<String, Object>集合,然后xml文件中就可以正常使用Map集合中的各個參數了。
具體實例如下:
(1)xxxMapper.java文件中這樣定義:
List<Airline> findAll(Map<String, Object> parms);
(2)在用到上面定義的具體實現類中給Map傳參:
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public List<Airline> findAll(PageInfo page,Airline airline) { HashMap<String,Object> params = new HashMap<String,Object>(); params.put( "page" , page); params.put( "airline" , airline); return airlineMapper.findAll(params); } |
(3)此時對應的xxxMapper.xml文件使用“java.util.Map”來接收這個Map集合:
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<sql id= "sqlfileders" > <bind name = "fileders" value= "#{'id':'ID','departureAirport':'DEPARTURE_AIRPORT','relDepartureAirport':'REL_DEPARTURE_AIRPORT','arrivalAirport':'ARRIVAL_AIRPORT','relArrivalAirport':'REL_ARRIVAL_AIRPORT','popStatus':'POP_STATUS','status':'STATUS','creator':'CREATOR','createTime':'CREATE_TIME'}" /> <bind name = "javapropertys" value= "#{'ID':'id','DEPARTURE_AIRPORT':'departureAirport','REL_DEPARTURE_AIRPORT':'relDepartureAirport','ARRIVAL_AIRPORT':'arrivalAirport','REL_ARRIVAL_AIRPORT':'relArrivalAirport','POP_STATUS':'popStatus','STATUS':'status','CREATOR':'creator','CREATE_TIME':'createTime'}" /> </sql> < select id= "findAll" resultMap= "BaseResultMap" parameterType= "java.util.Map" > <![CDATA[ select x.* from ( select z.*, rownum numbers from ( ]]> select <include refid= "Base_Column_List" /> from USR_AIR_LINE < where > <if test= "airline.departureAirport != null" > DEPARTURE_AIRPORT = #{airline.departureAirport} </if> <if test= "airline.arrivalAirport != null" > and ARRIVAL_AIRPORT=#{airline.arrivalAirport} </if> <if test= "airline.relDepartureAirport != null" > and REL_DEPARTURE_AIRPORT = #{airline.relDepartureAirport} </if> <if test= "airline.relArrivalAirport != null" > and REL_ARRIVAL_AIRPORT = #{airline.relArrivalAirport} </if> <if test= "airline.popStatus != null" > and POP_STATUS = #{airline.popStatus} </if> <if test= "airline.status != null" > and STATUS = #{airline.status} </if> </ where > <if test= "page.sortName != null" > <include refid= "sqlfileders" /> <bind name = "orderfield" value= "#this.fileders[page.sortName]" /> order by ${orderfield} ${page.sortOrder} </if> <![CDATA[ ) z where rownum < ]]> #{page. to } <![CDATA[ ) x where x.numbers >= ]]> #{page. from } </ select > |
注:上面的實例實現的是分頁查詢數據。我們可以發現使用Map來傳遞參數這種形式并不好,因為這樣使得在接口中只有一個Map參數,其他人進行維護的時候并不清楚到底需要向這個Map里面傳遞什么參數進去
二 通過給參數添加@Param注解來解決問題:
(1)給xxxMapper.java文件的方法中的參數添加@Param注解,這個注解中的值對應xml文件中使用到的參數名稱:
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Airline selectEffectiveAirline( @Param ( "departureAirport" ) String departureAirport, @Param ( "arrivalAirport" ) String arrivalAirport, @Param ( "status" ) BigDecimal status); |
(2)此時xxxMapper.xml文件中對應的地方就可以正常使用在@Param注解中對應的值了:
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<select id= "selectEffectiveAirline" resultMap= "BaseResultMap" parameterType= "java.util.Map" > select <include refid= "Base_Column_List" /> from USR_AIR_LINE <where> < if test= "departureAirport != null" > DEPARTURE_AIRPORT = #{departureAirport} </ if > < if test= "arrivalAirport != null" > and ARRIVAL_AIRPORT=#{arrivalAirport} </ if > < if test= "status != null" > and STATUS = #{status} </ if > </where> </select> |
注:需要注意的是if條件判斷中的參數和在SQL語句中寫法是不一樣的,if判斷中的變量是沒有添加#{ }的
下面在單獨給大家介紹下通過Mybatis傳遞多個參數的兩個方法
Map傳遞多個參數
parameterType 可以是別名或完全限定名,map或者java.util.Map,這兩個都是可以的
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<select id= "selectBlogByMap" parameterType= "map" resultType= "Blog" > select t.ID, t.title, t.content FROM blog t where t.title = #{h_title} and t.content =#{h_content} </select> public void testSelectByMap() { SqlSession session = sqlSessionFactory.openSession(); Map<String, Object> param= new HashMap<String, Object>(); param.put( "h_title" , "oracle" ); param.put( "h_content" , "使用序列" ); Blog blog = (Blog)session.selectOne( "cn.enjoylife.BlogMapper.selectBlogByMap" ,param); session.close(); System.out.println( "blog title:" +blog.getTitle()); } |
通過JavaBean傳遞多個參數
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<select id= "selectBlogByBean" parameterType= "Blog" resultType= "Blog" > select t.ID, t.title, t.content from blog t wheret.title = #{title} and t.content =#{content} </select> public void testSelectByBean() { SqlSession session = sqlSessionFactory.openSession(); Blog blog= new Blog(); blog.setTitle( "oracle" ); blog.setContent( "使用序列!" ); Blog newBlog = (Blog)session.selectOne( "cn.enjoylife.BlogMapper.selectBlogByBean" ,blog); session.close(); System.out.println( "new Blog ID:" +newBlog.getId()); } |
原文鏈接:http://www.zifangsky.cn/388.html