<select id="xxx" parameterType="com.model.xxx" resultMap="BaseResultMap">
select * from users WHERE 1=1
<if test="name != null and name != ''" >
and name like CONCAT('%',#{name,jdbcType=VARCHAR},'%')
</if> <if test="identity != null and identity != ''" >
and identity like CONCAT('%',#{identity,jdbcType=VARCHAR},'%')
</if> <if test="phon != null and phon != ''" >
and phon like CONCAT('%',#{phon,jdbcType=VARCHAR},'%')
</if>
</select>
