MyBatis传入多个参数的处理方法

一、单个参数

1. Java Mapper接口

public List<XXBean> getXXBeanList(@param("id")String id);  

2. XML Mapper

<select id="getXXXBeanList" parameterType="java.lang.String" resultType="XXBean">
    select t.* from tableName t where t.id= #{id}  
</select>  

二、多参数

方案1：

1. Java Mapper接口

public List<XXXBean> getXXXBeanList(String xxId, String xxCode);  

2. XML Mapper

<select id="getXXXBeanList" resultType="XXBean">
    select t.* from tableName where id = #{0} and name = #{1}  
</select>  

注意：#{index}，索引从0开始

方案2：基于注解（推荐）

1. Java Mapper接口

public List<XXXBean> getXXXBeanList(@Param("id")String id, @Param("code")String code);  

2. XML Mapper

<select id="getXXXBeanList" resultType="XXBean">
    select t.* from tableName where id = #{id} and name = #{code}  
</select>  

三、Map封装多参数

1. Java Mapper接口

public List<XXXBean> getXXXBeanList(HashMap map);  

2. XML Mapper

<select id="getXXXBeanList" parameterType="java.util.Map" resultType="XXBean">
　　select 字段... from XXX where id=#{xxId} code = #{xxCode}  
</select>  

map中key可在#{}中直接使用

四、List封装in

1. Java Mapper接口

public List<XXXBean> getXXXBeanList(List<String> list);

2. XML Mapper

<select id="getXXXBeanList" resultType="XXBean">
　　select 字段... from XXX where id in
　　<foreach collection="list" item="item" index="index" open="(" separator="," close=")">  
　　　　#{item}  
　　</foreach>  
</select>

foreach 最后的效果是select 字段... from XXX where id in ('1','2','3','4')

五、接口方法只能传递一个参数，但实际所需参数既要包含String类型，又要包含List类型时的处理方法

1. Java代码

List<String> list = new ArrayList<String>();
Map<String, Object> map = new HashMap<String, Object>();
list.add("1");
list.add("2");
map.put("list", list); //网址id
map.put("siteTag", "0");//网址类型

2. Java Mapper接口

public List<SysWeb> getSysInfo(Map<String, Object> map2);

3. XML Mapper

<select id="getSysInfo" parameterType="java.util.Map" resultType="SysWeb">
    select t.sysSiteId, t.siteName, t1.mzNum as siteTagNum, t1.mzName as siteTag, t.url, t.iconPath
    from TD_WEB_SYSSITE t
    left join TD_MZ_MZDY t1 on t1.mzNum = t.siteTag and t1.mzType = 10
    WHERE t.siteTag = #{siteTag } and t.sysSiteId not in 
    <foreach collection="list" item="item" index="index" open="(" close=")" separator=",">
        #{item}
    </foreach>
</select>