Mysql的instr()函数用法及说明

 // 1、instr()函数，#{name}为参数
select id,name from test where instr(name,#{name})>0 

上述写法等同于下面
// 2、like
select id,name from test where name like concat('%',#{name},'%')

 instr(filed,str) > 0 ⇒ file like '%str%'
instr(filed,str) = 1 ⇒ file like  'str%'
instr(filed,str) = 0 ⇒ file not like  '%str%'

<select id="selectUserListByConds" parameterType="java.lang.String" resultMap="BaseResultMap">
        select
        a.userid,
        a.username,
        a.account,
        a.password,
        a.mobile,
        a.description,
        a.delete_flag,
        a.enabled,
        a.email,
        a.address,
        a.is_online,
        a.created_time,
        a.updated_time,
        a.created_user,
        a.updated_user,
        a.org_code,
        s.org_name,
        a.limit_ip,
        a.expiry_date,
        a.last_login_time,
        a.last_login_ip,
        a.account_type,
        a.account_type_name,
        a.tenant_id
        from s_user a
        left join s_department s on s.org_code=a.org_code and s.tenant_id=a.tenant_id
        where 1=1
        <if test="showdelete==null">
            and a.delete_flag!=1
        </if>
        <if test="account!=null and account!=''">
            and instr(a.account,#{account})>0
        </if>
        <if test ="username!=null and username!=''">
            and instr(a.username,#{username})>0
        </if>

        <if test="roleIds!=null and roleIds!=''">
            and exists(select * from s_user_role where user_id=a.userid and role_id = #{roleIds})
        </if>

        <if test="orgCode!=null and orgCode!=''">
            and instr(a.org_code,#{orgCode})>0
        </if>
        <if test="tenantId!=null and tenantId!=''">
            and a.tenant_id=#{tenantId}
        </if>
        order by a.created_time DESC
    </select>