有下面这样一个查询：
下面标紫色的查询条件，type的类型为Integer
<select
id="findDealerInfo"
parameterType="com.pisen.cloud.luna.ms.dealer.api.beans.DealerInfoBean"
resultType="com.pisen.cloud.luna.ms.dealer.api.beans.DealerInfoBean"> SELECT
dea.uid uid,
dea.enabled_flag enabledFlag,
dea.delete_flag deleteFlag,
dea.tenement_id tenementId,
dea.parent_id parentId,
pd.name parentName,
dea.name name,
dea.type type,
dea.bar_code barCode,
dea.outer_code outerCode,
dea.outer_id outerId,
dea.mne_code mneCode,
dea.address address,
dea.address_xy addressXy,
dea.business_area businessArea,
dea.business_area_xy businessAreaXy,
con.uid cantactUid,
con.name contactName,
con.mobile mobile,
dpo.uid depotUid,
dpo.name depotName,
dpo.address depotAddress,
dpo.depot_code depotCode,
dpo.ship_scope shipScope FROM
dealer AS dea
LEFT JOIN (SELECT a.* FROM contact AS a where tenement_id = #{tenementId} and main_contact = ${@com.pisen.cloud.luna.ms.dealer.base.domain.Contact@IS_MAIN} AND a.delete_flag = ${@com.pisen.cloud.luna.ms.dealer.base.common.BaseDomain@DELETE_FLAG_NO} AND a.enabled_flag = ${@com.pisen.cloud.luna.ms.dealer.base.common.BaseDomain@ENABLED_FLAG_EN}) con ON dea.uid = con.dealer_id
LEFT JOIN (SELECT b.* FROM depot AS b where b.delete_flag = ${@com.pisen.cloud.luna.ms.dealer.base.common.BaseDomain@DELETE_FLAG_NO} AND b.enabled_flag = ${@com.pisen.cloud.luna.ms.dealer.base.common.BaseDomain@ENABLED_FLAG_EN}) dpo on dpo.dealer_id = dea.uid
LEFT JOIN dealer pd on pd.uid = dea.parent_id WHERE
dea.tenement_id = #{tenementId}
AND
dea.delete_flag = ${@com.pisen.cloud.luna.ms.dealer.base.common.BaseDomain@DELETE_FLAG_NO} <if test="name != null and name != '' ">
AND
dea.name LIKE '%' #{name} '%'
</if>
<if test="type != null and type != '' ">
AND
dea.type = #{type}
</if>
<if test="outerCode != null and outerCode != '' ">
AND
dea.outer_code = #{outerCode}
</if>
<if test="mneCode != null and mneCode != '' ">
AND
dea.mne_code = #{mneCode}
</if>
<if test="address != null and address != '' ">
AND
dea.address LIKE '%' #{address} '%'
</if>
<if test="businessArea != null and businessArea != '' ">
AND
dea.business_area LIKE '%' #{businessArea} '%'
</if>
<if test="parentName != null and parentName != '' ">
AND
pd.name LIKE '%' #{parentName} '%'
</if>
<if test="contactName != null and contactName != '' ">
AND
con.name LIKE '%' #{contactName} '%'
</if>
<if test="mobile != null and mobile != '' ">
AND
con.mobile = #{mobile}
</if> order by dea.parent_id ,dea.create_date </select>
后来经过排查，真实的原因是因为：
integer类型的查询条件在判断是否为null的时候，只需要判断 !=null即可，否则本判断条件会出现问题，正确的写法如下：
<select
id="findDealerInfo"
parameterType="com.pisen.cloud.luna.ms.dealer.api.beans.DealerInfoBean"
resultType="com.pisen.cloud.luna.ms.dealer.api.beans.DealerInfoBean"> SELECT
dea.uid uid,
dea.enabled_flag enabledFlag,
dea.delete_flag deleteFlag,
dea.tenement_id tenementId,
dea.parent_id parentId,
pd.name parentName,
dea.name name,
dea.type type,
dea.bar_code barCode,
dea.outer_code outerCode,
dea.outer_id outerId,
dea.mne_code mneCode,
dea.address address,
dea.address_xy addressXy,
dea.business_area businessArea,
dea.business_area_xy businessAreaXy,
con.uid cantactUid,
con.name contactName,
con.mobile mobile,
dpo.uid depotUid,
dpo.name depotName,
dpo.address depotAddress,
dpo.depot_code depotCode,
dpo.ship_scope shipScope FROM
dealer AS dea
LEFT JOIN (SELECT a.* FROM contact AS a where tenement_id = #{tenementId} and main_contact = ${@com.pisen.cloud.luna.ms.dealer.base.domain.Contact@IS_MAIN} AND a.delete_flag = ${@com.pisen.cloud.luna.ms.dealer.base.common.BaseDomain@DELETE_FLAG_NO} AND a.enabled_flag = ${@com.pisen.cloud.luna.ms.dealer.base.common.BaseDomain@ENABLED_FLAG_EN}) con ON dea.uid = con.dealer_id
LEFT JOIN (SELECT b.* FROM depot AS b where b.delete_flag = ${@com.pisen.cloud.luna.ms.dealer.base.common.BaseDomain@DELETE_FLAG_NO} AND b.enabled_flag = ${@com.pisen.cloud.luna.ms.dealer.base.common.BaseDomain@ENABLED_FLAG_EN}) dpo on dpo.dealer_id = dea.uid
LEFT JOIN dealer pd on pd.uid = dea.parent_id WHERE
dea.tenement_id = #{tenementId}
AND
dea.delete_flag = ${@com.pisen.cloud.luna.ms.dealer.base.common.BaseDomain@DELETE_FLAG_NO} <if test="name != null and name != '' ">
AND
dea.name LIKE '%' #{name} '%'
</if>
<if test="type != null ">
AND
dea.type = #{type}
</if>
<if test="outerCode != null and outerCode != '' ">
AND
dea.outer_code = #{outerCode}
</if>
<if test="mneCode != null and mneCode != '' ">
AND
dea.mne_code = #{mneCode}
</if>
<if test="address != null and address != '' ">
AND
dea.address LIKE '%' #{address} '%'
</if>
<if test="businessArea != null and businessArea != '' ">
AND
dea.business_area LIKE '%' #{businessArea} '%'
</if>
<if test="parentName != null and parentName != '' ">
AND
pd.name LIKE '%' #{parentName} '%'
</if>
<if test="contactName != null and contactName != '' ">
AND
con.name LIKE '%' #{contactName} '%'
</if>
<if test="mobile != null and mobile != '' ">
AND
con.mobile = #{mobile}
</if> order by dea.parent_id ,dea.create_date </select>