MyBatis常见报错问题及解决方案

这是一个出错的代码

public interface OrderInfoManageMapper {

List<GetOrderInfoManageListReq> selectAllOrder();

void modifyDelivery(int id);

void removeOrder(int id);

List<GetOrderInfoManageListReq> selectOrderById(@Param("id") Integer id);

}

一、报错:

1 There is no getter for property named 'id' in 'class java.lang.Integer'

检查mapper.xml文件,没错,如下:

<select id="selectOrderById" parameterType="java.lang.Integer" resultMap="BaseResultMap">

SELECT DISTINCT

order_info.id,

user_info.user_name,

order_info.order_status,

order_info.pay_type,

order_info.total_price,

ship_address.ship_user_name,

ship_address.ship_user_mobile,

ship_address.ship_address,

order_goods.goods_desc,

order_goods.goods_sku,

order_goods.goods_icon,

order_goods.goods_price

FROM

order_info,

user_info,

ship_address,

order_goods

WHERE

order_info.id = order_goods.order_id

AND order_info.user_id = user_info.id

AND order_info.ship_id = ship_address.id

<if test="id!= null and id!= '' ">

AND order_info.id = #{id}

</if>

</select>

检查mapper接口,如下:

public interface OrderInfoManageMapper {

List<GetOrderInfoManageListReq> selectAllOrder();

void modifyDelivery(int id);

void removeOrder(int id);

List<GetOrderInfoManageListReq> selectOrderById(Integer id);

}

看似没有问题,但是id的话,需要这么写(看最后一行):

public interface OrderInfoManageMapper {

List<GetOrderInfoManageListReq> selectAllOrder();

void modifyDelivery(int id);

void removeOrder(int id);

List<GetOrderInfoManageListReq> selectOrderById(@Param("id") Integer id);

}

二、sql没问题却报错:

java.sql.SQLException: 无效的列类型: 1111

原因是在mybatis中

SELECT

C_NAME1,

C_NAME2

FROM

MY_TABLE

WHERE

1=1

AND ID IN ({#param})

param是java传来的字符串 'id1','id2','id3'

此时就会报这个错误,因为使用in条件时不能用#,要使用$,如

SELECT

C_NAME1,

C_NAME2

FROM

MY_TABLE

WHERE

1=1

AND ID IN ({$param})

三、java想mybatis中传入‘a','b','c',放在in中

可能会这么写mybatis:

 SELECT * FROM TABLE_NAME

 WHERE 1=1

 <if para!= null && para!="" >

 AND PARS in (#{para})

 </if>

java传过来的para为

 String para = "'a','x','d','g'";

此时预期效果为

 SELECT * FROM TABLE_NAME

 WHERE 1=1

 AND PARS in ('a','x','d','g')

但是判断会通过,值不会传入,会出现:

 SELECT * FROM TABLE_NAME

 WHERE 1=1

 AND PARS in ()

将#换成$才可以。虽然#很安全

SELECT * FROM TABLE_NAME

WHERE 1=1

<if para!=null && para!="" >

AND PARS in (${para})

</if>

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