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mybatis_databaseIdProvider_全局配置属性
阅读量:315 次
发布时间:2019-03-04

本文共 900 字,大约阅读时间需要 3 分钟。

mybatis-config.xml

如果是Oracle的数据库,databaseId就是oracle

如果是MySQL数据库,databaseId就是mysql

XxxMapperDy.xml

在这里插入图片描述

这里的意思是如果数据库为mysql的话则查找,如果参数不为空的话则按照last_name查找。

对应的接口

在这里插入图片描述

Test

@Test    public void test4()throws Exception{        SqlSessionFactory sqlSessionFactory = getSqlSessionFactory();        SqlSession openSession = sqlSessionFactory.openSession();        EmployMapperDynamicSQL mapper = openSession.getMapper(EmployMapperDynamicSQL.class);        List
list = mapper.getEmpsTestInnerParameter(null); for (Employee employee : list) { System.out.println(employee); } openSession.close(); }

在这里插入图片描述

这里由于传入的为null,所以没有参数,则全部都查出来

databaseId和parameter

Mybatis的唯一参数

  • _databaseId:是区分数据库的
  • _parameter:代表的是全部的参数
    如果是单个参数的话则代表的是那个参数,如果是多个参数的话代表的则是map集合

转载地址:http://naaq.baihongyu.com/

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