Mysql语句：前端传入参数，数据库判断参数是否为空从而选择是全部查找还是按参数查找

联表查询，两张表，一张是table表，一张db表，根据数据库的名字查其下属的所有表。
遇到mybatis错误:There is no getter for property named ‘xxx’ in ‘class java.lang.String’

首先在DAO层接口加上@Param（”dbName”）

 List<TkvTable> selectByDBName(@Param("dbName") String dbName);

SQL语句

 <select id="selectByDBName" resultType="TkvTable" parameterType="String">
    select
     t.id,
     t.name,
     t.ctime,
     t.uptime,
     t.cuser,
     t.upuser,
     t.item_count,
     t.database_id,
     d.name as db_name
    from
     tkv_table t INNER JOIN tkv_database d ON t.database_id=d.id
    where 1=1
     <if test="dbName != null and dbName != ''">
       and d.name like #{dbName}
     </if>
  </select>

<if test="dbName != null and dbName != ''">
       and d.name like #{dbName}
     </if>

这里的dbName要和接口里的参数相对应，要注意是d.name不是name