mybatis中if判断为0无效

问题描述

下面sql语句中，level字段传入0的时候，插入和修改都会失败。

	<update id="updateDept" parameterType="SysDept">
 		update sys_dept
 		<set>
 			<if test="parentId != null and parentId != 0">parent_id = #{parentId},if>
 			<if test="deptName != null and deptName != ''">dept_name = #{deptName},if>
 			<if test="ancestors != null and ancestors != ''">ancestors = #{ancestors},if>
 			<if test="orderNum != null">order_num = #{orderNum},if>
 			<if test="leader != null">leader = #{leader},if>
 			<if test="phone != null">phone = #{phone},if>
 			<if test="email != null">email = #{email},if>
 			<if test="status != null and status != ''">status = #{status},if>
 			<if test="updateBy != null and updateBy != ''">update_by = #{updateBy},if>
			<if test="level != null and level != ''">level = #{level},if>
 			update_time = sysdate()
 		set>
 		where dept_id = #{deptId}
	update>

原因与方案

mybatis中传入int类型的0时，会当成字符处理，即当成""空字符串处理。如果要插入0 ，把后面level != ''删掉即可，只留下面面的判断。
修改后的level字段如下：

	<update id="updateDept" parameterType="SysDept">
 		update sys_dept
 		<set>
 			<if test="parentId != null and parentId != 0">parent_id = #{parentId},if>
 			<if test="deptName != null and deptName != ''">dept_name = #{deptName},if>
 			<if test="ancestors != null and ancestors != ''">ancestors = #{ancestors},if>
 			<if test="orderNum != null">order_num = #{orderNum},if>
 			<if test="leader != null">leader = #{leader},if>
 			<if test="phone != null">phone = #{phone},if>
 			<if test="email != null">email = #{email},if>
 			<if test="status != null and status != ''">status = #{status},if>
 			<if test="updateBy != null and updateBy != ''">update_by = #{updateBy},if>
			<if test="level != null">level = #{level},if>
 			update_time = sysdate()
 		set>
 		where dept_id = #{deptId}
	update>