判断传入参数是否为空或者null，否则传入null时，会报关闭的连接

src/main/resources/mybatis/mapper/cqxz/TbStAsjMapper.xml

@@ -2,6 +2,9 @@
 <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
     <mapper namespace="com.founder.interservice.mapper.cqxz.TbStAsjMapper">
     <select id="findAsjxxByAsjbh" parameterType="String" resultType="com.founder.interservice.model.TbStAsj">
-         SELECT ASJBH as asjbh,ASJFSSJ_ASJFSKSSJ as asjfssjAsjfskssj,AJMC as ajmc,ASJFSDD_DZMC as asjfsddDzmc,JYAQ as jyaq,AJLBDM  from TB_ST_ASJ where XXSC_PDBZ='0' and asjbh IN (${_parameter})
+         SELECT ASJBH as asjbh,ASJFSSJ_ASJFSKSSJ as asjfssjAsjfskssj,AJMC as ajmc,ASJFSDD_DZMC as asjfsddDzmc,JYAQ as jyaq,AJLBDM  from TB_ST_ASJ where XXSC_PDBZ='0'
+        <if test="_parameter != null and _parameter != ''" >
+            and asjbh IN (${_parameter})
+        </if>
     </select>
 </mapper>
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