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  • mybatis Parameter 'balance' not found. Available parameters are [0, 1, param1, param2]]

    今天做数据持久化时,发现了如下bug,原因是肯定的:对mybatis不熟悉,以示警戒,该好好看看了

    18:24:45.028 [http-nio-80-exec-2] ERROR org.apache.catalina.core.ContainerBase.[Tomcat].[localhost].[/].[dispatcherServlet]
      - Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed;
      nested exception is org.mybatis.spring.MyBatisSystemException: nested exception is org.apache.ibatis.binding.
      BindingException: Parameter 'balance' not found. Available parameters are [0, 1, param1, param2]] with root cause org.apache.ibatis.binding.
      BindingException: Parameter 'balance' not found. Available parameters are [0, 1, param1, param2]

    代码:

    @Update("update user set balance = #{balance} where id = #{id}")
    public void updateUserBalance(long id, BigDecimal balance);

    分析:开始还以为这是EL表达式的写法呢,没想到mybatis不认账,只识别数据的顺序,也就是数组的顺序。0 1

    解决方案:

    @Update("update user set balance = #{1} where id = #{0}")
    public void updateUserBalance(long id, BigDecimal balance);

    这样就OK了。

    这样传参是由于参数类型所决定的,而如果传过来的是对象的话,就不用这样了,这也就是我误认为EL表达式的写法。贴上源码

    @Update("update user set "
                + "username = #{username}, "
                + "account_no = #{accountNo}, "
                + "login_pwd = #{loginPwd}, "
                + "mobile = #{mobile}, "
                + "email = #{email}"
                + " where id = #{id}")
    public void update(UserInfo userInfo);
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  • 原文地址:https://www.cnblogs.com/yangchas/p/7383841.html
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