Caused by: org.postgresql.util.PSQLException: ERROR: operator does not exist: character varying = integer

Springboot项目，使用postgresql数据库，mybatis做持久层框架，

1 <select id="select" resultMap="BaseResultMap" parameterType="com.vo.TestVo">
2         select 
3             <include refid="Base_Column_List" />
4         from test
5         where state='2'
6         <if test="comCode != null" >
7             and com_code=${comCode}
8         </if>
9     </select>

comcode的形式如：'1100'

执行查询时报错:

### The error may exist in file [D:\workspaceAll\eclipseWorkspace\test\target\classes\mapper\custom\test\QcTestDao.xml]
### The error may involve com.dao.TestDao.select-Inline
### The error occurred while setting parameters
### SQL: select          id, comcode,name   from test   where state='2'        and com_code=00000000
### Cause: org.postgresql.util.PSQLException: ERROR: operator does not exist: character varying = integer
  建议：No operator matches the given name and argument type(s). You might need to add explicit type casts.
  位置：286
; bad SQL grammar []; nested exception is org.postgresql.util.PSQLException: ERROR: operator does not exist: character varying = integer
  建议：No operator matches the given name and argument type(s). You might need to add explicit type casts.
  位置：286] with root cause
org.postgresql.util.PSQLException: ERROR: operator does not exist: character varying = integer
  建议：No operator matches the given name and argument type(s). You might need to add explicit type casts.
  位置：286

 解决方法：

1 <if test="comCode != null" >
2       and com_code=#{comCode,jdbcType=VARCHAR}
3 </if>