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Mybatis mapping problem

Isn't there any problem with this way of writing? Use surface and field names to distinguish mappings. Will mybatis recognize it?

大家講道理 2017-05-27 17:41:24 0  2  1112

java - Mybatis related query

In actual development, Mybatis one-to-many and many-to-many related queries use reultMap reference, javaType reference or select reference. Which one has better performance? Will using select lazy loading improve query speed and performance?

ringa_lee 2017-05-27 17:41:50 0  1  805

java - spring boot integrated mybatis annotation version query

-spring boot integrates mybatis and uses annotations to implement spring boot and mybatis. It has been integrated normally. Annotations are used when using queries. (The project does not have any XML files) {Code...} I don’t know why this method is used. There are only a few attributes. The value wi...

曾經(jīng)蠟筆沒有小新 2017-06-23 09:14:41 0  2  1369

REGEXP in mybatis

The red box part (,sum(if(Item_169 REGEXP '^[0-9]{1,12}(.[0-9]{1,5})?$',Item_169,0))) is passed into mybatis in the background Configuration file (the configuration file is received with ${}), the entire sql is copied to the mysql database and runs normally; how to solve this problem

怪我咯 2017-06-06 09:51:53 0  1  919

java - Spring boot mybatis custom converter problem

When spring boot is integrated with mybatis, the custom typehandler (converter) is not called. First, the table structure entity enumeration type custom handler mybatis.type-handlers-package has been configured. Let me help.

ringa_lee 2017-06-14 10:54:51 0  1  1430

Which label should be used in mybatis to use mysql's ON DUPLICATE KEY UPDATE syntax to implement existence and update?

Mybatis seems to only provide four tags for add, delete, modify and check (<insert>/<update>/<delete>/<select>). But similar to this branch processing statement with existence and update, how should mybatis be used? ?

PHP中文網(wǎng) 2017-06-10 09:49:42 0  1  1068

java - Mybatis database multi-table related paging problem

For example: there are two entity classes User and Address {code...} Database: {code...} Mybatis mapping configuration: {code...} The relationship between users and addresses is: one user has multiple addresses, An address can only belong to one user. One-to-many Assume that the current demand is to...

黃舟 2017-06-10 09:49:39 0  6  1715

mysql - mybatis query counts the number of a certain column, group query based on a column, how to receive in xml file

Mybatis query counts the number of a certain column. According to a column, group query. I don’t know how to write the resultType parameter in the xml file. SQL statement: select title_type,COUNT(title) from qa_title where title like '%車%' GROUP BY title_type; xml: <...

ringa_lee 2017-06-15 09:21:18 0  1  1521

java - SSM integration page prompts 404 problem, please take a look (Spring+MyBatis is successful, but integrating SpringMVC always gives 404)

The web.xml configuration is as follows. The spring-mvc.xml configuration is as follows. The controller content is as follows. The project structure is as follows. Phenomenon: When starting tomcat, the jump pages index.jsp and showUser.jsp are both 404. Since the SSM framework is built, the previous...

僅有的幸福 2017-05-17 10:00:36 0  1  1057

java - How to modify mybatis if it exists in the database, and add if it does not exist

I want to implement an insert function. Before inserting, it is judged whether there is the same data as the key field in the database. If so, perform the modification operation. If not, perform the insert operation. I would like to ask for advice: Is there any way to make the judgment without doing...

給我你的懷抱 2017-05-17 10:04:15 0  3  710

java - Mybatis: Can Mybatis directly return a two-dimensional array (table)

Application scenario: Each mybaits result is mapped to an entity class. Sometimes when I am making front-end reports, I can directly get the desired report through SQL statements, but the results must be mapped to an entity class. If there are multiple The reports are different in individual fields,...

高洛峰 2017-05-17 10:01:04 0  3  1402

mysql - mybatis select statement problem

Message reminder continues. This message may be someone else's direct reply to your article. At this time, you need to perform database operations to associate the article table to obtain the content of the corresponding article [Message reminder: There is a new reply to your article xxx]. It may al...

過去多啦不再A夢 2017-06-20 10:05:48 0  3  1193

JAVA mybatis pojo.xml configuration problem

I just learned JAVA, and I wrote it based on the example, but it can’t run. The error message is: {code...} My writing method is like this {code...} I wrote pojo.User, and the error message is not sure what to do here. Write, the project directory is as shown in the figure

某草草 2017-06-23 09:14:12 0  3  1064

java - Mybatis executes sql summation problem

This is a summation sql I need to execute. In the client, the query value count is 0.select count(1) as COUNT from dd_mst where ac_id=1000002400 and ac_seqn<>1 and ac_sts ='1' passed in the program The following tool class is called: The problem is, through...

淡淡煙草味 2017-06-14 10:51:48 0  1  771

Database - java design table prefix meaning

Why does the java + Mybatis system need to add table prefixes when designing tables? Are there any disadvantages in not adding them? Thanks

世界只因有你 2017-06-12 09:21:42 0  4  875

mybatis - Java about Mysql random id generation

I am working on an e-commerce project and encountered a problem when generating the ID. It is definitely not possible to directly use mysql's auto_increment, because it is not safe to generate orders in this case. A third party can directly monitor the number of orders generated at a certain time th...

伊謝爾倫 2017-05-18 10:44:55 0  3  1031

java - How to map one-to-many in Mybatis

For example, there is an entity class {code...} I originally wrote this, but it was wrong T0T, how should I map the content to List<String> {code...}

曾經(jīng)蠟筆沒有小新 2017-05-17 10:07:25 0  3  655

java - How to obtain the newly added id in mybatis

<insert id="saveCustomer" parameterType="com.xiaonatech.dsx.entity.CustomerEntity" useGeneratedKeys="true" keyProperty="policyID"> {代碼...} dao層pub

天蓬老師 2017-06-30 09:53:48 0  6  1295

Does jdbcTemplate support mapping of complex objects?

{Code...} Can you use jdbcTemplate to map the result set into the above complex objects (that is, an object is also associated with an object or a collection of objects)? If you don't use mybatis or hibernate, is there any other way to facilitate mapping?

PHPz 2017-05-17 09:58:27 0  1  821

java - database query multiple tables

Prerequisite oralce, mybatis now has multiple tables. I now need to count the amount of information in each table, that is, count(*). My current method is to write multiple methods, such as in mapper: long selectCountA; long selectCountB; long selectCountC ; In this case, I want to...

習(xí)慣沉默 2017-05-18 10:45:06 0  4  894