例子:```<update id="insert" parameterType="...实体" merge into 表名 a using (select 1 from dual) on (a.字段1 = {参数} and a.字段2 = {参数2}) when not matched then insert (字段1,字段2,字段3) ...
刚开始学习mybatis在update时一直报以下错误org.mybatis.spring.MyBatisSystemException: nested exception is org.apache.ibatis.type.TypeException: Could not set parameters for mapping: ParameterMapping{property='cat...
In this article, we will show you how to loop a `List` and a `Map` with the new Java 8 `forEach` statement.1\. forEach and Map1.1 Normal way to loop a Map.```java Map<String, Integer items = n...
今天在看Arraylist原码的时候看到如下代码```java @Override public void forEach(Consumer<? super E action) { Objects.requireNonNull(action); final int expectedModCount = modCount; @Suppre...
版权协议,转载请附上原文出处链接和本声明。本文链接:mysql经常使用关键字,5.7以前的版本能正常使用,但是之后版本遇到这样的错误: Caused by: java.sql.SQLException: Expression 1 of ORDER BY clause is not in SELECT list, references column ‘xxxxxxxxxxxxxxx’ ...
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