for example, can I do this
<association property="">
<association property=""></association>
</association>I tried, and the compilation passed, but there was an error at run time, if not.
the function I"m trying to do now is that there are three classes, Amam Bjurisdiction C
.c as the attribute of B, and B as the attribute of A, I hope to find out the data of a
c at one time through the id of c. How should I write my mapping file
Previous: Automatic prompt for html tag of webstorm
Next: Vue.js mounted problem
the .xml file of mybatis in spring-boot can only be placed under resources mappper, like this: put together with the interface, not uniformly placed under the resources mapper, separate, easy to manage. thanks! ...
use mybatis to configure custom secondary cache. Using xml annotation can use < cache type= "com.test.dao.MybatisRedisCache " > to successfully use custom cache, but using @ CacheNamespace (implementation = MybatisRedisCache.class) on the dao i...
Multi-table management, because the sum operation is used, so even if there is no data mybatis query will become one. The result is that null, if the default value is set on the sum, such as 0, it will return a piece of data that only the field sum is 0....
when using Mybatise, I use the following code to operate on the database. No error is reported, and it executes successfully, but the database does not find data @Test public void testInsertUser(){ SqlSession sqlSession = sessionFactory.o...
...
when using MyBatis, there is a problem with an incomprehensible SELECT statement. <select id="getHotelList" resultType="com.genius.travelline.product.entity.Hotel"> SELECT a.id AS "id", a.title AS "t...
first, there is a field of Date type in the database. If you want to query all the records of 2018-04-08, but ignore the following time, minutes and seconds, how do you write the query statement and the mybatis mapping file? ...
there is a problem that I can t solve when I just learned ssm,. No, no, no. The directory structure is as follows error message: Caught exception while allowing TestExecutionListener [org.springframework.test.context.support.DependencyInjectionTes...
I want to use the example class of mybatis to generate the following sql statement: SELECT * FROM User where nick_name like "%1502%" or real_name like "%1502%" or mobile like "%1502%" this is how I used it: UserExample u...
the data sent from the front desk is of date type, and then query how to report such an error in the field of date type of sql server database based on this data: ,date : : : ...
error prompt use: <dependency> <groupId>org.springframework< groupId> <artifactId>spring-orm< artifactId> <version>4.3.14.RELEASE< version> < dependency> <depend...
Creating a new SqlSession SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@79669d23] was not registered for synchronization because synchronization is not active Closing non transactional SqlSession [org.apache.ibatis.session.defaults.Def...
mybatis foreach tag <if test="map.itemNos!=null and map.itemNos.size()>0"> AND EXISTS (SELECT 1 FROM COM_INV_ITEMS WHERE INVENTORY_ITEM_ID= h.INVENTORY_ITEM_ID AND SEGMENT1 IN <foreach item="itemNo&quo...
when operating on the database, the table is locked, the field value of the table is updated, the query is returned, and finally the table is unlocked. The sql statements executed without jdbc for are as follows: LOCK TABLE yh WRITE; UPDATE yh SET val...
is a string made up of multiple id String ids = "1 id 2, 3 4 ". Now you want to traverse through the mybatis without cutting it into an array. What do you do according to the delete operation according to the id? I reported an error here: < where > ...
I m sorry about my careless problems. < span> ...
recently, when (spring) integrates redis in a project, I always hold a null pointer exception when going to the factory instance: but the unit test is always normal: the following is the redis-config.xml file public class SpringContextUtil implement...
select <include refid="Base_Column_List" > from sys_permission where id = -sharp{id,jdbcType=INTEGER} < select> < mapper> if you change dao to List < SysRole > getRoleWithPermission (Inte...
how should I open the index implementation on the home page of the website to query the relevant data from the background database and then bind it to the page? ...
using JDBCDataSouce is normal, startup and stop are normal, and no error is reported. when switching to C3P0 configuration in C3P0 XML: <!-- --> <bean id="dataSource_c3p0_properties" class="com.mchange.v2.c3p0.ComboPooledD...