mybatis內(nèi)置參數(shù)

mybatis默認(rèn)還有兩個(gè)內(nèi)置參數(shù):

• _parameter；代表整個(gè)參數(shù)

  • 單個(gè)參數(shù):_parameter就是這個(gè)參數(shù)

  • 多個(gè)參數(shù):參數(shù)會(huì)被封裝為一個(gè)map; _parameter就是代表這個(gè)map

• _databaseId；如果配置了DatabaseIdProvider標(biāo)簽

  • _databaseId就是代表當(dāng)前數(shù)據(jù)庫(kù)的別名

配置DatabaseIdProvider標(biāo)簽

在配置文件中配置

<databaseIdProvider type="DB_VENDOR"><property name="MySQL" value="mysql"/><property name="Oracle" value="oracle"/></databaseIdProvider> public List<Employee> getEmpsTestInnerParameter(Employee employee); <!-- public List<Employee> getEmpsTestInnerParameter(Employee employee);--> <select id="getEmpsTestInnerParameter" resultType="com.atguigu.mybatis.bean.Employee"> <!--<bind name = "_lastName" value = "'%'+lastName+'%'"/>--> <if test = "_databaseId=='mysql'">select * from tb1_employee<if test = "_parameter!=null">where last_name like #{_parameter.lastName}</if> </if><if test = "_databaseId == 'oracle'">select * from employees<if test = "_parameter!=null">where last_name like #{_parameter.lastName}</if></if></select> @Testpublic void test04() throws IOException {SqlSessionFactory sqlSessionFactory = getSqlSessionFactory();SqlSession sqlSession = sqlSessionFactory.openSession();try{EmployeeMapperDynamicSQL mapper = sqlSession.getMapper(EmployeeMapperDynamicSQL.class);Employee employee = new Employee();employee.setLastName("%a%");List<Employee> emps = mapper.getEmpsTestInnerParameter(employee);for (Employee e : emps){System.out.println(e);}}finally {sqlSession.close();}}

總結(jié)

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