Summary of problems encountered in the development process in July

1、BeanUtils.copyProperties Usage of

Data source copy of the event

BeanUtils.copyProperties Usage of _ Wang Tingting -Smily The blog of -CSDN Blog _beanutils.copyproperties

2、mybatis Next mapper Inherit basemapper, It may report an error that the entity does not exist , You need to annotate the entity class

@TableName(" Table names in the database ")

Mybatis-Plus-pudn.com

3、mybatis Next .xml file sql How to write sentences

<select id="mapper Name of the interface in " resultType=" Return type ">
  SELECT
    b.id
  FROM
     Database table name  b
  WHERE
    b.enabled=1
  <if test=" Field 1 != null">
    and b. Field 1 = #{ Interface fields 1,jdbcType=VARCHAR}
  </if>
  <if test=" Field 2 != null">
    and b. Field 2 = #{ Interface fields 2,jdbcType=INTEGER}
  </if>
</select>

4、 The database connection error may be caused by the writing of the database connection configuration file

5、 solve idea in maven Project pom Files will not be downloaded automatically jar Package problem

solve idea in maven Project pom Files will not be downloaded automatically jar Package problem + Update incomplete dependency command _ Program ape bald road blog -CSDN Blog _ideamaven Do not download dependent packages