About the use of typeAliases

About the use of typeAliases

When querying in Mybatis, parameterType is usually added to specify the parameter type. When the parameter is a class, we need to fully qualify the class name.
When a class belongs to many SQL statements, it will be more troublesome to write the fully qualified class name every time.
So Mybatis provided a typeAliases tag to help me solve this trouble.

The typeAliases tag is generally written in SqlMapConfig.xml, which is the xml of the configuration database, the code is as follows:

 <typeAliases>
        <typeAlias type="com.imis.pojo.Goods" alias="goods"></typeAlias>
    </typeAliases>

Indicate the fully qualified class name and alias, in the future use only need to use the alias to replace the fully qualified class name

 List<Goods> queryByCondition(Goods goods);
 
  public void Test8(){
    
    
        Goods goods=new Goods();
        goods.setGoods_name("test1");
        List<Goods> goods1 = iGoodsDao.queryByCondition(goods);
        System.out.println(goods1);
    }

 <select id="queryByCondition" resultMap="goodsMap" parameterType="goods">
        select * from goods where 1=1
        <if test="goods_name!=null">
            and name=#{goods_name}
        </if>
    </select>